CHANGES
=======

5.11.0
------

* Skip installation to speed up pep8
* fix typo
* Skip functional jobs for license file update
* pre-commit: Bump versions
* Remove "test" extra
* Sync test requirements
* Remove zake from runtime dependency
* Read pifpaf environments to detect service ports
* Drop unused constants
* Bump etcd in tests
* Replace oslo\_utils.encodeutils.exception\_to\_unicode
* Bump pylint
* Skip functional tests for doc update
* reno: Update master for unmaintained/2023.1

5.10.0
------

* Add note about requirements lower bounds
* Remove Python 3.8 support
* Declare Python 3.12 support
* Remove unused usage of pkg\_resources
* Drop SQLALCHEMY\_WARN\_20
* Update master for stable/2024.2

5.9.1
-----


5.9.0
-----

* Follow-up of "Add Etcd backend for jobboard"
* Add functional test with etcd
* Add Etcd backend for jobboard

5.8.0
-----

* Python3.12: disable process\_executor, which depends on asyncore
* Fix REVERT\_ALL with Retries in unordered Flows
* Remove SQLAlchemy tips jobs
* Remove old excludes
* Remove assertRaisesRegex
* Replace deprecated Engine.execute

5.7.0
-----

* Add functional job with redis enabled
* db: Don't rely on branched connections
* Fix broken unit tests for redis jobboard driver
* Fix update-states target
* Revert "Use consistent credential for Redis and Redis Sentinel"
* Update master for stable/2024.1
* reno: Update master for unmaintained/victoria

5.5.0
-----

* Prevent potential ReDoS attack
* redis: Support fallback servers
* Use consistent credential for Redis and Redis Sentinel
* redis: Enable SSL for sentinel
* redis: Add username
* Bump hacking
* Replace deprecated perl-style regex
* Cleanup setup.py and requirements
* Update python classifier in setup.cfg
* coveragerc: Remove non-existent path
* Fix python shebang
* Avoid endless backtraces on StorageFailure
* Fix incorrect handling of storage exceptions
* bindep: Use new mysql-\* package names
* Update master for stable/2023.2

5.4.0
-----

* Update redis dep to >=3.0.0

5.3.0
-----

* Add job to test with SQLAlchemy master (2.x)
* db: Don't rely on autocommit behavior
* tests: Enable SQLAlchemy 2.0 deprecation warnings
* tests: Use valid IPv6 address

5.2.0
-----

* Revert "Moves supported python runtimes from version 3.8 to 3.10"
* Moves supported python runtimes from version 3.8 to 3.10
* Upgrade development status
* Fix doc building with Sphinx 6.0
* Prepare taskflow for sqlalchemy2
* Update master for stable/2023.1
* Fix parsing of zookeeper jobboard backend options

5.1.0
-----

* Fix test\_while\_is\_not with python 3.11
* Change StrictRedis usage to Redis
* remove unicode prefix from code
* Adapt to new jsonschema versions
* Replace abc.abstractproperty with property and abc.abstractmethod

5.0.0
-----

* Quote string representations
* Fix formattiing of release list
* Remove six
* Drop python3.6/3.7 support in testing runtime
* Delete the job from backend if it cannot be consumed

4.7.0
-----

* Update CI to use unversioned jobs template
* Fix atomdetails failure column size
* Fix unit tests

4.6.4
-----

* Handle invalid redis entries in RedisJobBoard
* Fix minor typo in ActionEngine exception message
* Use LOG.warning instead of deprecated LOG.warn

4.6.3
-----


4.6.2
-----

* Replace deprecated import of ABCs from collections
* Use custom JSONType columns

4.6.1
-----

* Updating for OFTC IRC network
* Fix flowdetails meta size
* Use unittest.mock instead of mock
* setup.cfg: Replace dashes with underscores
* Move flake8 as a pre-commit local target
* Remove lower-constraints remnants

4.6.0
-----

* Fix deprecated Alembic function args
* Dropping lower constraints testing
* Use TOX\_CONSTRAINTS\_FILE
* Use py3 as the default runtime for tox
* Add Python3 wallaby unit tests
* Update master for stable/victoria
* ignore reno generated artifacts
* Adding pre-commit

4.5.0
-----

* [goal] Migrate testing to ubuntu focal

4.4.0
-----

* Avoid endless loop on StorageFailure
* Add sentinel redis support
* Switch from unittest2 compat methods to Python 3.x methods

4.3.1
-----

* Make test-setup.sh compatible with mysql8

4.3.0
-----

* Stop to use the \_\_future\_\_ module

4.2.0
-----

* Switch to newer openstackdocstheme and reno versions
* Cap jsonschema 3.2.0 as the minimal version
* Import modules, not classes
* Bump default tox env from py37 to py38
* Add py38 package metadata
* Add release notes links to doc index
* Drop use of deprecated collections classes
* Add Python3 victoria unit tests
* Update master for stable/ussuri

4.1.0
-----

* Zookeeper backend SSL support

4.0.0
-----

* [ussuri][goal] Drop python 2.7 support and testing

3.8.0
-----

* Switch to Ussuri jobs
* Update TaskFlow for networkx 2.x
* Update master for stable/train
* Fix python3.8 hmac compatibility

3.7.1
-----

* Use mysql LONGTEXT for atomdetails results
* Add Python 3 Train unit tests
* Add local bindep.txt
* Remove unused tools/tox\_install.sh

3.7.0
-----

* update git.openstack.org to opendev
* Dropping the py35 testing
* Remove debtcollector requirement
* Update Sphinx requirement

3.6.0
-----

* Remove unsused tools/tox\_install.sh
* Handle collections.abc deprecations
* Uncap jsonschema
* OpenDev Migration Patch
* Update master for stable/stein
* add python 3.7 unit test job

3.4.0
-----

* Move test requirements out of runtime requirements
* Change openstack-dev to openstack-discuss

3.3.1
-----

* Update doc/conf.py to avoid warnings with sphinx 1.8
* Use templates for cover and lower-constraints
* Remove the duplicated word
* Fix a symbol error
* Create KazooClient with taskflow logger
* add lib-forward-testing-python3 test job
* add python 3.6 unit test job
* add proper pydot3 dependency
* import zuul job settings from project-config
* Switch to use stestr for unit test
* Add pydot test dependency
* Remove PyPI downloads
* Update reno for stable/rocky
* Update various links in docs

3.2.0
-----

* Remove unused link target
* Fix code to support networkx > 1.0
* add release notes to README.rst
* replace http with https
* Update links in README
* fix tox python3 overrides
* Drop py34 target in tox.ini
* Uncap networkx
* give pep8 and docs environments all of the dependencies they need
* Trivial: update pypi url to new url
* Fix doc build
* Trivial: Update pypi url to new url
* stop using tox\_install.sh
* only run doc8 as part of pep8 test job
* standardize indentation in tox.ini
* set default python to python3
* don't let tox\_install.sh error if there is nothing to do
* Updated from global requirements
* add lower-constraints job
* Updated from global requirements
* Fix invalid json unit test
* Update reno for stable/queens
* Updated from global requirements
* Updated from global requirements
* Updated from global requirements
* Updated from global requirements

3.1.0
-----

* Updated from global requirements
* Add doc8 to pep8 environment
* Use doc/requirements.txt

3.0.1
-----


3.0.0
-----

* Remove setting of version/release from releasenotes
* Updated from global requirements
* Updated from global requirements
* Updated from global requirements
* Remove class StopWatch from timing

2.17.0
------


2.16.0
------

* Updated from global requirements
* Updated from global requirements
* Update "indentify" to "identify" in comments

2.15.0
------

* Updated from global requirements
* Remove method blather in log adapter
* Remove kwarg timeout in executor conductor
* Updated from global requirements
* Avoid log warning when closing is underway (on purpose)
* Update reno for stable/pike
* Updated from global requirements

2.14.0
------

* Updated from global requirements
* Update URLs in documents according to document migration
* Updated from global requirements
* Fix process based executor task proxying-back events
* turn on warning-is-error in doc build
* switch from oslosphinx to openstackdocstheme
* rearrange existing documentation into the new standard layout
* Updated from global requirements

2.13.0
------

* Updated from global requirements
* Fix html\_last\_updated\_fmt for Python3
* Replace assertRaisesRegexp with assertRaisesRegex

2.12.0
------

* Updated from global requirements
* Updated from global requirements
* do not allow redis job reclaim by same owner

2.11.0
------

* Fix py35 test failure
* Stop using oslotest.mockpatch
* Updated from global requirements
* python3.0 has deprecated LOG.warn

2.10.0
------

* Updated from global requirements
* Updated from global requirements
* Updated from global requirements
* Prepare for using standard python tests
* Use https instead of http for git.openstack.org
* Updated from global requirements
* Update reno for stable/ocata
* Protect storage better against external concurrent access

2.9.0
-----

* Remove dep on monotonic
* Rename engine analyzer to be named selector
* Update author and author-email
* Updated from global requirements
* Updated from global requirements
* Add Constraints support
* Show team and repo badges on README

2.8.0
-----

* Replaces uuid.uuid4 with uuidutils.generate\_uuid()
* Updated from global requirements
* Remove vim header from source files
* Fix release notes gate job failure
* Updated from global requirements
* Use assertIs(Not)None to check for None
* Fix typo in tox.ini
* Fix broken link
* Replace retrying with tenacity
* Updated from global requirements
* Add reno for release notes management
* Updated from global requirements

2.7.0
-----

* Changed the home-page link
* Using assertIsNone() instead of assertIs(None, ..)
* Updated from global requirements
* Fix a typo in documentation
* Fix typo: remove redundant 'that'
* Updated from global requirements
* Fix a typo in logging.py
* Use method ensure\_tree from oslo.utils
* Make failure formatter configurable for DynamicLoggingListener
* Updated from global requirements
* Some classes not define \_\_ne\_\_() built-in function

2.6.0
-----


2.5.0
-----

* Updated from global requirements
* Add logging around metadata, ignore tallying + history

2.4.0
-----

* Updated from global requirements
* Start to add a location for contributed useful tasks/flows/more
* Change dependency to use flavors
* Updated from global requirements
* Remove white space between print and ()
* Updated from global requirements
* Add Python 3.5 classifier and venv
* Replace assertEqual(None, \*) with assertIsNone in tests

2.3.0
-----

* Updated from global requirements
* remove unused LOG
* Fixes: typo error in comments
* Updated from global requirements
* Fix some misspellings in the function name and descriptions
* Updated from global requirements

2.2.0
-----

* Don't use deprecated method timeutils.isotime
* Add tests to verify kwargs behavior on revert validation
* Make tests less dependent on transient state

2.1.0
-----

* Updated from global requirements
* Ensure the fetching jobs does not fetch anything when in bad state
* Updated from global requirements
* Use the full 'get\_execute\_failures' vs the shortname
* Split revert/execute missing args messages
* Updated from global requirements
* Instead of a multiprocessing queue use sockets via asyncore
* Add a simple sanity test for pydot outputting

2.0.0
-----

* Updated from global requirements
* Fix documentation related to missing BaseTask class
* Remove deprecated things for 2.0 release
* Always used the library packaged mock

1.32.0
------

* Attempt to cancel active futures when suspending is underway
* Allow for specifying green threaded to parallel engine
* Make conductor.stop stop the running engine gracefully

1.31.0
------

* Updated from global requirements
* Don't set html\_last\_updated\_fmt without git
* Updated from global requirements
* Add the ability to skip resolving from activating
* Fix export\_to\_dot for networkx package changes
* Ensure upgrade for sqlalchemy is protected by a lock
* Add periodic jobboard refreshing (incase of sync issues)
* Fallback if git is absent
* Allow for revert to have a different argument list from execute

1.30.0
------

* Updated from global requirements
* Use a automaton machine for WBE request state machine
* Sqlalchemy-utils double entry (already in test-requirements.txt)

1.29.0
------

* Updated from global requirements
* Refactor Atom/BaseTask/Task/Retry class hierarchy
* Add missing direct dependency for sqlalchemy-utils

1.28.0
------

* Add WBE worker expiry
* Some WBE protocol/executor cleanups
* Remove need for separate notify thread
* Updated from global requirements
* Don't bother scanning for workers if no new messages arrived
* Updated from global requirements
* Updated from global requirements
* Updated from global requirements
* Allow cachedproperty to avoid locking
* Spice up WBE banner and add simple worker \_\_main\_\_ entrypoint

1.27.0
------

* Updated from global requirements
* Fix for WBE sporadic timeout of tasks
* Add some basic/initial engine statistics
* Handle cases where exc\_args can't be serialized as JSON in the WBE
* Enable OS\_LOG\_CAPTURE so that logs can be seen (on error)
* Retrieve the store from flowdetails as well, if it exists
* Disable oslotest LOG capturing
* Updated from global requirements
* Updated from global requirements
* Use helper function for post-atom-completion work
* Ensure that the engine finishes up even under sent-in failures
* 99 bottles example trace logging was not being output
* Add useful/helpful comment to retry scheduler
* Updated from global requirements
* Updated from global requirements
* Replace clear zookeeper python with clear zookeeper bash
* Remove stray LOG.blather

1.26.0
------

* Some additional engine logging
* Replace deprecated library function os.popen() with subprocess
* Add comment as to why we continue when tallying edge decider nay voters
* Add rundimentary and/or non-optimized job priorities
* Allow for alterations in decider 'area of influence'
* Fix wrong usage of iter\_utils.unique\_seen
* Updated from global requirements
* Updated from global requirements
* Updated from global requirements
* Use the retrying lib. to do basic sqlalchemy engine validation
* For taskflow patterns don't show taskflow.patterns prefix
* Rename '\_emit' -> '\_try\_emit' since it is best-effort (not ensured)
* Cache atom name -> actions and provide accessor function
* Quote/standardize atom name output
* Use shared util helper for driver name + config extraction
* Fix currently broken and inactive mysql tests
* Trap and expose exception any 'args'
* Revert "Remove failure version number"
* Move all internal blather usage/calls to trace usage/calls
* Start rename of BLATHER -> TRACE
* Add ability of job poster/job iterator to wait for jobs to complete
* Updated from global requirements
* Use 'match\_type' utility function instead of staticmethod
* Remove failure version number
* Translate kazoo exceptions into job equivalents if register\_entity fails
* Change name of misc.ensure\_dict to misc.safe\_copy\_dict
* Avoid recreating notify details for each dispatch iteration
* fix doc change caused by the change of tooz
* Deprecated tox -downloadcache option removed
* Updated from global requirements
* Add some useful commentary on rebinding processes
* Use small helper routine to fetch atom metadata entries
* Remove 'MANIFEST.in'
* Pass through run timeout in engine run()
* Change engine 'self.\_check' into a decorator

1.25.0
------

* Move validation of compiled unit out of compiler
* Allow provided flow to be empty
* Move engine options extraction to \_\_init\_\_ methods
* Updated from global requirements
* Updated from global requirements
* Convert executor proxied engine options into their correct type
* Enable conversion of the tree nodes into a digraph
* Use the misc.ensure\_dict helper in conductor engine options saving
* Add optional 'defer\_reverts' behavior
* Add public property from storage to flowdetail.meta
* Adding notification points for job completion
* Remove python 2.6 and cleanup tox.ini
* Correctly apply deciders across flow boundaries
* Move 'convert\_to\_timeout' to timing type as a helper function
* Use conductor entity class constant instead of raw string
* Add a executor backed conductor and have existing impl. use it
* Add flow durations to DurationListener
* Update docstrings on entity type
* Move 'fill\_iter' to 'iter\_utils.fill'

1.24.0
------

* Updated from global requirements
* Updated from global requirements
* Register conductor information on jobboard
* Add atom priority ability
* Add validation of base exception type(s) in failure type
* Fix order of assertEqual for unit.test\_\*
* Fix order of assertEqual for unit.worker\_based
* Fix order of assertEqual for unit.persistence
* Fix order of assertEqual for unit.patterns
* Fix order of assertEqual for unit.jobs
* Fix order of assertEqual for unit.action\_engine

1.23.0
------

* Updated from global requirements
* feat: add max\_dispatches arg to conductor's run
* Ensure node 'remove' and 'disassociate' can not be called when frozen
* Add in-memory backend delete() in recursive/non-recursive modes
* Use batch 'get\_atoms\_states' where we can
* Use automaton's converters/pydot
* Make more of the WBE logging and '\_\_repr\_\_' message more useful
* Fix bad sphinx module reference
* Relabel internal engine 'event' -> 'outcome'
* No need for Oslo Incubator Sync
* Use the node built-in 'dfs\_iter' instead of recursion

1.22.0
------

* Simplify flow action engine compilation
* Fix 'dependened upon' spelling error
* docs - Set pbr warnerrors option for doc build
* Rename 'history' -> 'Release notes'
* Remove dummy/placeholder 'ChangeLog' as its not needed
* Remove ./taskflow/openstack/common as it no longer exists
* Remove quotes from subshell call in bash script
* Refactor common parts of 'get\_maybe\_ready\_for' methods
* Fix the sphinx build path in .gitignore file
* Change ignore-errors to ignore\_errors
* Use graphs as the underlying structure of patterns
* Updated from global requirements
* Fix '\_cache\_get' multiple keyword argument name overlap
* Use the sqlalchemy-utils json type instead of our own

1.21.0
------

* Updated from global requirements
* Fix how the dir persistence backend was not listing logbooks
* Explain that jobs arch. diagram is only for zookeeper

1.20.0
------

* Updated from global requirements
* iter\_nodes method added to flows
* Updated from global requirements
* Use 'iter\_utils.count' to determine how many unfinished nodes left
* Fix flow states link
* Avoid running this example if zookeeper is not found
* Updated from global requirements
* Have the storage class provide a 'change\_flow\_state' method

1.19.0
------

* Updated from global requirements
* Updated from global requirements
* Add nicely made task structural diagram
* Updated from global requirements
* Remove some temporary variables not needed
* Only remove all 'next\_nodes' that were done
* Fix busted stevedore doc(s) link
* Extend and improve failure logging
* Improve docstrings in graph flow to denote exceptions raised
* Enable testr OS\_DEBUG to be TRACE(blather) by default
* Updated from global requirements
* Show intermediary compilation(s) when BLATHER is enabled

1.18.0
------

* Give the GC more of a break with regard to cycles
* Base class for deciders
* Remove extra runner layer and just use use machine in engine
* Updated from global requirements
* .gitignore update
* Avoid adding 1 to a failure (if it gets triggered)
* Replace the tree 'pformat()' recursion with non-recursive variant
* Fix seven typos and one readability on taskflow documentation

1.17.0
------

* Bump futurist and remove waiting code in taskflow
* Use the action engine '\_check' helper method
* Modify listeners to handle the results now possible from revert()
* Remove no longer used '\_was\_failure' static method
* Remove legacy py2.6 backwards logging compat. code
* Updated from global requirements
* Fix lack of space between functions
* Create and use a serial retry executor
* Just link to the worker engine docs instead of including a TOC inline
* Link to run() method in engines doc
* Add ability to reset an engine via a \`reset\` method

1.16.0
------

* Updated from global requirements
* Use 'addCleanup' instead of 'tearDown' in engine(s) test
* Update 'make\_client' kazoo docs and link to them
* Remove \*\*most\*\* usage of taskflow.utils in examples
* Move doc8 to being a normal test requirement in test-requirements.txt
* Updated from global requirements
* Found another removal\_version=? that should be removal\_version=2.0
* Add deprecated module(s) for prior FSM/table code-base
* Replace internal fsm + table with automaton library
* Remove direct usage of timeutils overrides and use fixture

1.15.0
------

* Provide a deprecated alias for the now removed stop watch class
* Update all removal\_version from being ? to being 2.0
* Add deprecated and only alias modules for the moved types
* Unify the zookeeper/redis jobboard iterators
* Updated from global requirements
* Run the '99\_bottles.py' demo at a fast rate when activated
* Use io.open vs raw open
* Retain atom 'revert' result (or failure)
* Update the version on the old/deprecated logbook module
* Add docs for u, v, decider on graph flow link method
* Fix mock calls
* Remove setup.cfg 'requires-python' incorrect entry
* Compile lists of retry/task atoms at runtime compile time
* Integrate futurist (and \*\*remove\*\* taskflow originating code)
* Allow the 99\_bottles.py demo to run in BLATHER mode
* Make currently implemented jobs use @functools.total\_ordering
* Add more useful \`\_\_str\_\_\` to redis job
* Show job posted and goodbye in 99\_bottles.py example
* Rename logbook module -> models module
* Notify on the individual engine steps

1.14.0
------

* Expose strategies so doc generation can easily pick them up
* Denote mail subject should be '[Oslo][TaskFlow]'
* Add support for conditional execution
* Use encodeutils for exception -> string function
* Updated from global requirements
* Build-out + test a redis backed jobboard

0.13.0
------

* Just make the compiler object at \_\_init\_\_ time
* Remove kazoo hack/fix for issue no longer needed
* Add history.rst that uses generated 'ChangeLog' file
* Add docstrings on runtime objects methods and link to them in docs

0.12.0
------

* Updated from global requirements
* Update states comment to refer to task section
* Updated from global requirements
* Remove 2.6 classifier + 2.6 compatibility code
* Remove reference to 'requirements-pyN.txt' files
* Add smarter/better/faster impl. of \`ensure\_atoms\`
* Add bulk \`ensure\_atoms\` method to storage
* Make it possible to see the queries executed (in BLATHER mode)
* Add doc warning to engine components
* Perform a few optimizations to decrease persistence interactions
* Handle conductor ctrl-c more appropriately
* Cache the individual atom schedulers at compile time
* Split-off the additional retry states from the task states
* Use the \`excutils.raise\_with\_cause\` after doing our type check
* Updated from global requirements
* Use monotonic lib. to avoid finding monotonic time function
* Document more of the retry subclasses special keyword arguments

0.11.0
------

* Address concurrent mutation of sqlalchemy backend
* Add indestructible 99 bottles of beer example
* Use alembic upgrade function/command directly
* Updated from global requirements
* Remove usage of deprecated 'task\_notifier' property in build\_car example
* Add \`simple\_linear\_listening\` example to generated docs
* Handy access to INFO level
* Switch badges from 'pypip.in' to 'shields.io'
* Adding a revert\_all option to retry controllers
* A few jobboard documentation tweaks
* Use sphinx deprecated docstring markup
* Use a class constant for the default path based backend path
* Updated from global requirements
* Remove example not tested
* Make the default file encoding a class constant with a docstring
* Use a lru cache to limit the size of the internal file cache
* Updated from global requirements
* Use hash path lookup vs path finding
* Remove all 'lock\_utils' now that fasteners provides equivalents
* Add a new \`ls\_r\` method
* Updated from global requirements
* Refactor machine builder + runner into single unit
* Replace lock\_utils lock(s) with fasteners package
* Updated from global requirements
* Use shared '\_check' function to check engine stages
* Remove a couple more useless 'pass' keywords found
* Add a test that checks for task result visibility
* Remove testing using persistence sqlalchemy backend with 'mysqldb'
* Remove customized pyX.Y tox requirements
* Updated from global requirements
* Allow same deps for requires and provides in task
* Remove 'pass' usage not needed
* Only show state transitions to logging when in BLATHER mode
* Fix updated\_at column of sqlalchemy tables
* Remove script already nuked from oslo-incubator
* Ensure path\_based abstract base class is included in docs
* Beef up docs on the logbook/flow detail/atom details models
* Remove custom py26/py27 tox venvs no longer used
* Executors come in via options config, not keyword arguments
* Use newer versions of futures that adds exception tracebacks
* Ensure empty paths raise a value error
* Remove listener stack and replace with exit stack
* Expose action engine no reraising states constants
* Chain a few more exception raises that were previously missed
* Expose in memory backend split staticmethod
* Updated from global requirements
* Remove tox py33 environment no longer used
* Avoid creating temporary removal lists

0.10.1
------

* Avoid trying to copy tasks results when cloning/copying
* Avoid re-normalizing paths when following links
* Add a profiling context manager that can be easily enabled
* Updated from global requirements

0.10.0
------

* Remove validation of state on state read property access
* Make the default path a constant and tweak class docstring
* Avoid duplicating exception message
* Add speed-test tools script
* Speed up memory backend via a path -> node reverse mapping
* Updated from global requirements
* Fix a typo in taskflow docs
* Small refactoring of 'merge\_uri' utility function
* Fix post coverage job option not recognized
* Refactor/reduce shared 'ensure(task/retry)' code
* Move implementations into there own sub-sections
* Remove run\_cross\_tests.sh
* Move zookeeper jobboard constants to class level
* Retain chain of missing dependencies
* Expose fake filesystem 'join' and 'normpath'
* Add + use diagram explaining retry controller area of influence
* Add openclipart.org conductor image to conductor docs
* Use oslo\_utils eventletutils to warn about eventlet patching
* Test more engine types in argument passing unit test
* Add a conductor running example
* Replace more instance(s) of exception chaining with helper
* Avoid attribute error by checking executor for being non-none

0.9.0
-----

* Validate correct exception subclass in 'raise\_with\_cause'
* Remove link to kazoo eventlet handler
* Add states generating venv and use pydot2
* Add strict job state transition checking
* Uncap library requirements for liberty
* Have reset state handlers go through a shared list
* Add job states in docs + states in python
* Expose r/o listener callback + details filter callback
* Expose listener notification type + docs
* Ensure listener args are always a tuple/immutable
* Include the 'dump\_memory\_backend' example in the docs
* Make resolution/retry strategies more clear and better
* Rename notifier 'listeners' to 'topics'
* Mention link to states doc in notify state transitions
* Ensure we don't get stuck in formatting loops
* Add note about thread safety of fake filesystem
* Have the notification/listener docs match other sections
* Put semantics preservation section into note block
* Note that the traditional mode also avoids this truncation issue
* Avoid going into causes of non-taskflow exceptions
* Use the ability to chain exceptions correctly
* Add a example showing how to share an executor
* Shrink the bookshelf description
* Remove link about implementing job garbage binning
* Make the storage layer more resilent to failures
* Put the examples/misc/considerations under a new section
* Add a suspension engine section

0.8.1
-----

* Switch back to maxdepth 2
* Allow ls() to list recursively (using breadth-first)
* Make an attempt at having taskflow exceptions print causes better
* fix renamed class to call super correctly
* Turn 'check\_who' into a decorator
* Use 'node' terminology instead of 'item' terminology
* Remove 11635 bug reference
* Allow providing a node stringify function to tree pformat
* Add in memory filesystem clearing
* Just unify having a single requirements.txt file
* Fix a couple of spelling and grammar errors
* Add memory backend get() support
* Make the graph '\_unsatisfied\_requires' be a staticmethod
* Add more comments to fake in-memory filesystem
* Add a set of tests to the in memory fake filesystem

0.8.0
-----

* Adding test to improve CaptureListener coverage
* Prefer posixpath to os.path
* By default use a in memory backend (when none is provided)
* Allow using shallow copy instead of deep copy
* Move to the newer debtcollector provided functions
* Move to using the oslo.utils stop watch
* Updated from global requirements
* Ensure thread-safety of persistence dir backend
* Ensure we are really setup before being connected
* Ensure docstring on storage properties
* Expose the storage backend being used
* Use iteration instead of list(s) when extracting scopes
* Use binary/encode decode helper routines in dir backend
* Rename memory backend filesystem -> fake filesystem
* Just let the future executors handle the max workers
* Always return scope walker instances from \`fetch\_scopes\_for\`
* Give the GC a break
* Use the class name instead of the TYPE property in \_\_str\_\_
* Just use the class name instead of TYPE constant
* Ensure we have a 'coverage-package-name'
* Attempt to extract traceback from exception
* Use compatible map and update map/reduce task docs
* Update engine docs with new validation stage
* Ensure we register & deregister conductor listeners
* Rename attribute '\_graph' to '\_execution\_graph'
* Add a log statement pre-validation that dumps graph info
* Have this example exit non-zero if incorrect results
* Use a collections.namedtuple for the request work unit
* Some small wbe engine doc tweaks
* Add newline to avoid sphinx warning
* Allow passing 'many\_handler' to fetch\_all function
* Ensure event time listener is in listeners docs
* Add a in-memory backend dumping example
* Added a map and a reduce task
* Restructure the in-memory node usage
* Switch to non-namespaced module imports
* Allow the storage unit to use the right scoping strategy
* Just use the local conf variable
* Put underscore in-front of alchemist helper
* lazy loading for logbooks and flowdetails
* Allow backend connection config (via fetch) to be a string
* Add + use failure json schema validation
* Use ordered[set/dict] to retain ordering
* Allow injected atom args to be persisted
* add \_listeners\_from\_job method to Conductor base
* update uses of TimingListener to DurationListener
* Added EventTimeListner to record when events occur
* added update\_flow\_metadata method to Storage class
* Retain nested causes where/when we can
* Denote issue 17911 has been merged/accepted
* Persistence backend refactor
* Remove support for 3.3
* Writers can now claim a read lock in ReaderWriterLock
* Add another probabilistic rw-lock test
* Add + use read/write lock decorators
* Add no double writers thread test
* Use condition context manager instead of acquire/release
* Remove condition acquiring for read-only ops
* Set a no-op functor when none is provided
* Ensure needed locks is used when reading/setting intention
* Specialize checking for overlaps
* Use links instead of raw block quotes
* Rename the timing listeners to duration listeners
* Add a bookshelf developer section
* Ensure the thread bundle stops in last to first order
* Add warning about transient arguments and worker-based-engines
* Ensure ordered set is pickleable
* Add node removal/disassociate functions
* Add a fully functional orderedset
* Make the worker banner template part of the worker class
* Use compilation helper objects
* Allow node finding to not do a deep search
* Add a frozen checking decorator
* Tweak functor used to find flatteners/storage routines
* Add specific scoping documentation
* add jobboard trash method
* Provide more contextual information about invalid periodics
* Fix lookup scoping multi-match ordering
* Stick to one space after a period
* Refactor parts of the periodic worker
* Use oslo.utils encodeutils for encode/decode functions
* Bring over pretty\_tox.sh from nova/heat/others
* Tweak some of the types thread safety docstrings
* Add pypi link badges
* Switch the note about process pool executor to warning
* Chain exceptions correctly on py3.x
* Updated from global requirements
* Remove WBE experimental documentation note
* Use the enum library for the retry strategy enumerations
* Use debtcollector library to replace internal utility
* add get\_flow\_details and get\_atom\_details to all backends
* Tweaks to atom documentation
* Update Flow::\_\_str\_\_
* Add todo note for kombu pull request
* Move 'provides' and 'name' to instance attributes
* Allow loading conductors via entrypoints

0.7.1
-----

* Revert "Add retries to fetching the zookeeper server version"
* Allow turning off the version check
* adding check for str/unicode type in requires
* Make the dispatcher handler be an actual type
* Add retries to fetching the zookeeper server version
* Remove duplicate 'the' and link to worker engine section
* Remove delayed decorator and replace with nicer method
* Fix log statement
* Make the atom class an abstract class
* Improve multilock class and its associated unit test
* Mark conductor 'stop' method deprecation kwarg with versions
* Move to hacking 0.10
* catch NotFound errors when consuming or abandoning
* Use the new table length constants
* Improve upon/adjust/move around new optional example
* Clarify documentation related to inputs
* Docstrings should document parameters return values
* Let the multi-lock convert the provided value to a tuple
* Map optional arguments as well as required arguments
* Add a BFS tree iterator
* DFS in right order when not starting at the provided node
* Rework the sqlalchemy backend
* Modify stop and add wait on conductor to prevent lockups
* Default to using a thread-safe storage unit
* Add warning to sqlalchemy backend size limit docs
* Updated from global requirements
* Use a thread-identifier that can't easily be recycled
* Use a notifier instead of a direct property assignment
* Tweak the WBE diagram (and present it as an svg)
* Remove duplicate code
* Improved diagram for Taskflow
* Bump up the env\_builder.sh to 2.7.9
* Add a capturing listener (for test or other usage)
* Add + use a staticmethod to fetch the immediate callables
* Just directly access the callback attributes
* Use class constants during pformatting a tree node

0.7.0
-----

* Abstract out the worker finding from the WBE engine
* Add and use a nicer kombu message formatter
* Remove duplicated 'do' in types documentation
* Use the class defined constant instead of raw strings
* Use kombu socket.timeout alias instead of socket.timeout
* Stopwatch usage cleanup/tweak
* Add note about publicly consumable types
* Add docstring to wbe proxy to denote not for public use
* Use monotonic time when/if available
* Updated from global requirements
* Link WBE docs together better (especially around arguments)
* Emit a warning when no routing keys provided on publish()
* Center SVG state diagrams
* Use importutils.try\_import for optional eventlet imports
* Shrink the WBE request transition SVG image size
* Add a thread bundle helper utility + tests
* Make all/most usage of type errors follow a similar pattern
* Leave use-cases out of WBE developer documentation
* Allow just specifying 'workers' for WBE entrypoint
* Add comments to runner state machine reaction functions
* Fix coverage environment
* Use explicit WBE worker object arguments (instead of kwargs)
* WBE documentation tweaks/adjustments
* Add a WBE request state diagram + explanation
* Tidy up the WBE cache (now WBE types) module
* Fix leftover/remaining 'oslo.utils' usage
* Show the failure discarded (and the future intention)
* Use a class provided logger before falling back to module
* Use explicit WBE object arguments (instead of kwargs)
* Fix persistence doc inheritance hierarchy
* The gathered runtime is for failures/not failures
* add clarification re parallel engine
* Increase robustness of WBE producer/consumers
* Move implementation(s) to there own sections
* Move the jobboard/job bases to a jobboard/base module
* Have the serial task executor shutdown/restart its executor
* Mirror the task executor methods in the retry action
* Add back a 'eventlet\_utils' helper utility module
* Use constants for runner state machine event names
* Remove 'SaveOrderTask' and test state in class variables
* Provide the stopwatch elapsed method a maximum
* Fix unused and conflicting variables
* Switch to using 'oslo\_serialization' vs 'oslo.serialization'
* Switch to using 'oslo\_utils' vs 'oslo.utils'
* Add executor statistics
* Use oslo.utils reflection for class name
* Add split time capturing to the stop watch
* Use platform neutral line separator(s)
* Create and use a multiprocessing sync manager subclass
* Use a single sender
* Updated from global requirements
* Include the 'old\_state' in all currently provided listeners
* Update the README.rst with accurate requirements
* Include docstrings for parallel engine types/strings supported
* The taskflow logger module does not provide a logging adapter
* Send in the prior atom state on notification of a state change
* Pass a string as executor in the example instead of an executor
* Updated from global requirements
* Fix for job consumption example using wrong object

0.6.1
-----

* Remove need to inherit/adjust netutils split
* Allow specifying the engine 'executor' as a string
* Disallowing starting the executor when worker running
* Use a single shared queue for an executors lifecycle
* Avoid creating a temporary list(s) for tree type
* Update statement around stopwatch thread safety
* Register with 'ANY' in the cloned process
* Add edge labels for engine states
* Remove less than useful action\_engine \_\_str\_\_
* Ensure manager started/shutdown/joined and reset
* Return the same namedtuple that the future module returns
* Add a simplistic hello world example
* Get event/notification sending working correctly
* Move the engine scoping test to its engines test folder
* Get the basics of a process executor working
* Move the persistence base to the parent directory
* Correctly trigger 'on\_exit' of starting/initial state

0.6.0
-----

* Add an example which shows how to send events out from tasks
* Move over to using oslo.utils [reflection, uuidutils]
* Rework the in-memory backend
* Updated from global requirements
* Add a basic map/reduce example to show how this can be done
* Add a parallel table mutation example
* Add a 'can\_be\_registered' method that checks before notifying
* Base task executor should provide 'wait\_for\_any'
* Replace autobind with a notifier module helper function
* Cleanup some doc warnings/bad/broken links
* Use the notifier type in the task class/module directly
* Use a tiny clamp helper to clamp the 'on\_progress' value
* Retain the existence of a 'EngineBase' until 0.7 or later
* Remove the base postfix from the internal task executor
* Remove usage of listener base postfix
* Add a moved\_inheritable\_class deprecation helper
* Avoid holding the lock while scanning for existing jobs
* Remove the base postfix for engine abstract base class
* Avoid popping while another entity is iterating
* Updated from global requirements
* Use explict 'attr\_dict' when adding provider->consumer edge
* Properly handle and skip empty intermediary flows
* Ensure message gets processed correctly
* Just assign a empty collection instead of copy/clear
* Remove rtype from task clone() doc
* Add and use a new simple helper logging module
* Have the sphinx copyright date be dynamic
* Add appropriate links into README.rst
* Use condition variables using 'with'
* Use an appropriate \`\`extract\_traceback\`\` limit
* Allow all deprecation helpers to take a stacklevel
* Correctly identify stack level in \`\`\_extract\_engine\`\`
* Stop returning atoms from execute/revert methods
* Have tasks be able to provide copy() methods
* Allow stopwatches to be restarted
* Ensure that failures can be pickled
* Rework pieces of the task callback capability
* Just use 4 spaces for classifier indents
* Move atom action handlers to there own subfolder/submodule
* Workflow documentation is now in infra-manual
* Ensure frozen attribute is set in fsm clones/copies
* Fix split on "+" for connection strings that specify dialects
* Update listeners to ensure they correctly handle all atoms
* Allow for the notifier to provide a 'details\_filter'
* Be explicit about publish keyword arguments
* Some package additions and adjustments to the env\_builder.sh
* Cache immutable visible scopes in the runtime component
* Raise value errors instead of asserts
* Add a claims listener that connects job claims to engines
* Split the scheduler into sub-schedulers
* Use a module level constant to provide the DEFAULT\_LISTEN\_FOR
* Move the \_pformat() method to be a classmethod
* Add link to issue 17911
* Avoid deepcopying exception values
* Include documentation of the utility modules
* Use a metaclass to dynamically add testcases to example runner
* Remove default setting of 'mysql\_traditional\_mode'
* Move scheduler and completer classes to there own modules
* Ensure that the zookeeper backend creates missing atoms
* Use the deprecation utility module instead of warnings
* Tweaks to setup.cfg
* Add a jobboard high level architecture diagram
* Mark 'task\_notifier' as renamed to 'atom\_notifier'
* Revert wrapt usage until further notice
* Updated from global requirements
* Add a history retry object, makes retry histories easier to use
* Format failures via a static method
* When creating daemon threads use the bundled threading\_utils
* Ensure failure types contain only immutable items
* Mark 'task\_notifier' as renamed to 'atom\_notifier'
* Use wrapt to provide the deprecated class proxy
* Updated from global requirements
* Updated from global requirements
* Updated from global requirements
* Reduce the worker-engine joint testing time
* Link bug in requirements so people understand why pbr is listed
* Updated from global requirements
* Use standard threading locks in the cache types
* Handle the case where '\_exc\_type\_names' is empty
* Add pbr to installation requirements
* Updated from global requirements
* Remove direct usage of the deprecated failure location
* Fix the example 'default\_provides'
* Use constants for retry automatically provided kwargs
* Remove direct usage of the deprecated notifier location
* Remove attrdict and just use existing types
* Use the mock that finds a working implementation
* Add a futures type that can unify our future functionality
* Bump the deprecation version number
* Use and verify event and latch wait() return using timeouts
* Deprecate \`engine\_conf\` and prefer \`engine\` instead
* Use constants for link metadata keys
* Bump up the sqlalchemy version for py26
* Hoist the notifier to its own module
* Move failure to its own type specific module
* Use constants for revert automatically provided kwargs
* Improve some of the task docstrings
* We can now use PyMySQL in py3.x tests
* Updated from global requirements
* Add the database schema to the sqlalchemy docs
* Change messaging from handler connection timeouts -> operation timeouts
* Switch to a custom NotImplementedError derivative
* Allow the worker banner to be written to an arbitrary location
* Update engine class names to better reflect there usage

0.5.0
-----

* Avoid usage of six.moves in local functions
* Refactor parts of the job lock/job condition zookeeper usage
* Make it so that the import works for older versions of kombu
* Rework the state documentation
* Updated from global requirements
* Add a more dynamic/useful logging listener
* Use timeutils functions instead of misc.wallclock
* Expose only \`ensure\_atom\` from storage
* Adjust docs+venv tox environments requirements/dependencies
* Increase robustness of WBE message and request processing
* Adjust the WBE log levels
* Use the features that the oslotest mock base class provides
* Use oslotest to provide our base test case class
* Jobboard example that show jobs + workers + producers
* Adjust on\_job\_posting to not hold the lock while investigating
* Bring in a newer optional eventlet
* Move some of the custom requirements out of tox.ini
* Document more function/class/method params
* Stop using intersphinx
* Expand toctree to three levels
* Documentation cleanups and tweaks
* Fix multilock concurrency when shared by > 1 threads
* Increase/adjust the logging of the WBE response/send activities
* Color some of the states depending on there meaning
* Switch to using oslo.utils and oslo.serialization
* Typos "searchs"
* Update the requirements-py2.txt file
* Remove no longer needed r/w lock interface base class
* Updated from global requirements
* Better handle the tree freeze method
* Ensure state machine can be frozen
* Link a few of the classes to implemented features/bugs in python
* Add a timing listener that also prints the results
* Remove useless \_\_exit\_\_ return
* Example which shows how to move values from one task to another
* Mention issue with more than one thread and reduce workers
* Add a mandelbrot parallel calculation WBE example
* Add existing types to generated documentation
* Remove the dependency on prettytable
* Work toward Python 3.4 support and testing
* Add a state machine copy() method
* Update the state graph builder to use state machine type
* Add a docs virtualenv
* Reduce unused tox environments

0.4.0
-----

* Add a couple of scope shadowing test cases
* Relax the graph flow symbol constraints
* Relax the unordered flow symbol constraints
* Relax the linear flow symbol constraints
* Revamp the symbol lookup mechanism
* Be smarter about required flow symbols
* Update oslo-incubator to 32e7f0b56f52742754
* Translate the engine runner into a well defined state-machine
* Raise a runtime error when mixed green/non-green futures
* Ensure the cachedproperty creation/setting is thread-safe
* warn against sorting requirements
* Updated from global requirements
* Update transitioning function name to be more understandable
* Move parts of action engine tests to a subdirectory
* Tweak engine iteration 'close-up shop' runtime path
* Use explicit WBE request state transitions
* Reject WBE messages if they can't be put in an ack state
* Make version.py handle pbr not being installed
* Cleanup WBE example to be simpler to understand
* Use \_\_qualname\_\_ where appropriate
* Updated from global requirements
* Updated from global requirements
* Make the WBE worker banner information more meaningful
* Have the dispatch\_job function return a future
* Expand documention on failures and wrapped failures types
* Allow worker count to be specified when no executor provided
* Remove sphinx examples emphasize-lines
* Split requirements into py2 and py3 files
* Update oslo-incubator to 037dee004c3e2239
* Remove db locks and use random db names for tests
* Allow WBE request transition timeout to be dynamic
* Avoid naming time type module the same as a builtin
* LOG which requeue filter callback failed
* Add a pformat() failure method and use it in the conductor
* add pre/post execute/retry callbacks to tasks
* Use checked\_commit() around consume() and abandon()
* Use a check + create transaction when claiming a job
* Improve WBE testing coverage
* Add basic WBE validation sanity tests
* WBE request message validation
* WBE response message validation
* WBE notification message validation
* Allow handlers to provide validation callables
* Use a common message dispatcher
* Use checked commit when committing kazoo transactions
* Enable hacking checks H305 and H307 in tox.ini template
* Fixes unsorted dicts and sets in doctests
* README.rst: Avoid using non-ascii character
* Updated from global requirements
* Add a sample script that can be used to build a test environment
* Enabled hacking checks H305 and H307
* Bump hacking to version 0.9.2
* Allow a jobs posted book to be none by default
* Cleanup some of the example code & docs
* Make greenexecutor not keep greenthreads active
* Add the arch/big picture omnigraffle diagram
* Remove pbr as a runtime dependency
* Use the \`state\_graph.py\` for all states diagrams
* Make the examples documentation more relevant
* Raise NotImplementedError instead of NotImplemented
* Move the stopwatch tests to test\_types
* Remove need to do special exception catching in parse\_uri
* Update oslo incubator code to commit 0b02fc0f36814968
* Fix the section name in CONTRIBUTING.rst
* Add a conductor considerations section
* Make the expiring cache a top level cache type
* Use \`flow\_uuid\` and \`flow\_name\` from storage
* Fix traces left in zookeeper
* Clarify locked decorator is for instance methods
* Extract the state changes from the ensure storage method
* Create a top level time type
* Simplify identity transition handling for tasks and retries
* Remove check\_doc.py and use doc8
* Remove functions created for pre-six 1.7.0
* Add a tree type
* Make intentions a tuple (to denote immutability)
* Updated from global requirements
* Add example for pseudo-scoping
* Fix E265 hacking warnings
* Fix doc which should state fetch() usage
* Adjust sphinx requirement
* Upgrade hacking version and fix some of the issues
* Denote that other projects can use this library
* Remove misc.as\_bool as oslo provides an equivalent
* Update zake to requirements version

0.3.21
------

* Rename additional to general/higher-level
* Sync our version of the interprocess lock
* Increase usefulness of the retry component compile errors
* Switch to a restructuredtext README file
* Create a considerations section
* Include the function name on internal errors
* Add in default transaction isolation levels
* Allow the mysql mode to be more than just TRADITIONAL
* Make the runner a runtime provided property
* Rename inject\_task\_args to inject\_atom\_args
* Rename the graph analyzer to analyzer
* Provide the compilation object instead of just a part of it
* Ensure cachedproperty descriptor picks up docstrings

0.3
---

* Warn about internal helper/utility usage
* Rename to atom from task
* Invert the conductor stop() returned result
* Move flattening to the action engine compiler
* Increase the level of usefulness of the dispatching logging
* Avoid forcing engine\_conf to a dict
* Allow for two ways to find a flow detail in a job for a conductor
* Add docs related to the new conductor feature
* Add docstring describing the inject instance variable
* Finish factoring apart the graph\_action module
* Update sphinx pin from global requirements
* Fix docstring list format
* Allow indent text to be passed in
* Factor out the on\_failure to a mixin type
* Use a name property setter instead of a set\_name method
* Adds a single threaded flow conductor
* add the ability to inject arguments into tasks at task creation
* Synced jsonutils from oslo-incubator
* Remove wording issue (track does not make sense here)
* Fix case of taskflow in docs
* Put the job external wiki link in a note section
* Rework atom documentation
* Add doc link to examples
* Rework the overview of the notification mechanism
* Standardize on the same capitalization pattern
* Regenerate engine-state sequence diagram
* Add source of engine-state sequence diagram
* Add kwarg check\_pending argument to fake lock
* Add a example which uses the run\_iter function in a for loop
* Fix error string interpolation
* Rename t\_storage to atom\_storage
* Create and use a new compilation module
* Add engine state diagram
* Add tests for the misc.cachedproperty descriptor
* Complete the cachedproperty descriptor protocol
* Don't create fake LogBook when we can not fetch one
* Use futures wait() when possible
* Use /taskflow/flush-test in the flush function
* Add a reset nodes function
* Default the impl\_memory conf to none
* Fix spelling mistake
* Add a helper tool which clears zookeeper test dirs
* Add a zookeeper jobboard integration test
* Cleanup zookeeper integration testing
* Use a more stable flush method
* Remove the \_clear method and do not reset the job\_watcher
* Allow command and connection retry configuration
* Check documentation for simple style requirements
* Add an example which uses the run iteration functionality
* Implement run iterations
* Put provides and requires code to basic Flow
* Allow the watcher to re-register if the session is lost
* Add a new wait() method that waits for jobs to arrive
* Add a cachedproperty descriptor
* Add an example for the job board feature
* Engine \_cls postfix is not correct
* Pass executor via kwargs instead of config
* Allow the WBE to use a preexisting executor
* Tweaks to object hiearchy diagrams
* Adjust doc linking
* Medium-level docs on engines
* Add docs for the worker based engine (WBE)
* Updated from global requirements
* Move from generator to iterator for iterjobs
* Add a jobboard fetching context manager
* Wrap the failure to load in the not found exception
* Update jobboard docs
* Synced jsonutils from oslo-incubator
* Remove persistence wiki page link
* Load engines with defined args and provided kwargs
* Integrate urlparse for configuration augmentation
* Fix "occured" -> "occurred"
* Documentation tune-ups
* Fix spelling error
* Add a resumption strategy doc
* Docs and cleanups for test\_examples runner
* Skip loading (and failing to load) lock files
* Add a persistence backend fetching context manager
* Add a example that activates a future when a result is ready
* Fix documentation spelling errors
* Add a job consideration doc
* Add last\_modified & created\_on attributes to jobs
* Allow jobboard event notification
* Use sequencing when posting jobs
* Add a directed graph type (new types module)
* Add persistence docs + adjustments
* Updated from global requirements
* Stings -> Strings
* Be better at failure tolerance
* Ensure example abandons job when it fails
* Add docs for jobs and jobboards
* Get persistence backend via kwargs instead of conf
* Allow fetching jobboard implementations
* Reuse already defined variable
* More keywords & classifier topics
* Allow transient values to be stored in storage
* Doc adjustments
* Move the daemon thread helper function
* Create a periodic worker helper class
* Fix not found being raised when iterating
* Allow for only iterating over the most 'fresh' jobs
* Updated from global requirements
* Update oslo-incubator to 46f2b697b6aacc67
* import run\_cross\_tests.sh from incubator
* Exception in worker queue thread
* Avoid holding the state lock while notifying

0.2
---

* Allow atoms to save their own state/result
* Use correct exception in the timing listener
* Add a engine preparation stage
* Decrease extraneous logging
* Handle retry last\_results/last\_failure better
* Improve documentation for engines
* Worker executor adjustments
* Revert "Move taskflow.utils.misc.Failure to its own module"
* Move taskflow.utils.misc.Failure to its own module
* Leave the execution\_graph as none until compiled
* Move state link to developer docs
* Raise error if atom asked to schedule with unknown intention
* Removed unused TIMED\_OUT state
* Rework documentation of notifications
* Test retry fails on revert
* Exception when scheduling task with invalid state
* Fix race in worker-based executor result processing
* Set logbook/flowdetail/atomdetail meta to empty dict
* Move 'inputs and outputs' to developers docs
* tests: Discover absence of zookeeper faster
* Fix spelling mistake
* Should be greater or equal to zero and not greater than
* Persistence cleanup part one
* Run worker-based engine tests faster
* SQLAlchemy requirements put in order
* Add timeout to WaitForOneFromTask
* Use same code to reset flow and parts of it
* Optimize dependency links in flattening
* Adjust the exception hierachy
* docs: Links to methods on arguments and results page
* Add \_\_repr\_\_ method to Atom
* Flattening improvements
* tests: Fix WaitForOneFromTask constructor parameter introspection
* Rework graph flow unit tests
* Rewrite assertion for same elements in sequences
* Unit tests for unordered flow
* Linear flow: mark links and rework unit tests
* Drop indexing operator from linear flow
* Drop obsolete test\_unordered\_flow
* Iteration over links in flow interface
* Add a timeout object that can be interrupted
* Avoid shutting down of a passed executor
* Add more tests for resumption with retry
* Improve logging for proxy publish
* Small documentation fix
* Improve proxy publish method
* Add Retry to developers documentation
* Move flow states to developers documentation
* Remove extraneous vim configuration comments
* Make schedule a proper method of GraphAction
* Simplify graph analyzer interface
* Test storage with memory and sqlite backends
* Fix few minor spelling errors
* Fix executor requests publishing bug
* Flow smart revert with retry controller
* Add atom intentions for tasks and retries
* [WBE] Collect information from workers
* Add tox environment for pypy
* docs: Add inheritance diagram to exceptions documentation
* Adjust logging levels and usage to follow standards
* Introduce message types for WBE protocol
* Add retry action to execute retries
* Extend logbook and storage to work with retry
* Add retry to execution graph
* Add retry to Flow patterns
* Add base class for Retry
* Update request \`expired\` property docsting
* docs: Add page describing atom arguments and results
* docs: Improve BaseTask method docstrings
* Remove extra quote symbol
* docs: Relative links improvements
* docs: Ingore 'taskflow.' prefix when sorting module index
* Update comment + six.text\_type instead of str for name
* Avoid calling callbacks while holding locks
* Rename remote task to request
* Rework proxy publish functionality
* Updated from global requirements
* Use message.requeue instead of message.reject
* Lock test tweaks
* Move endpoint subclass finding to reflection util
* Correct LOG.warning in persistence utils
* Introduce remote tasks cache for worker-executor
* Worker-based engine clean-ups
* A few worker-engine cleanups
* Add a delay before releasing the lock
* Allow connection string to be just backend name
* Get rid of openstack.common.py3kcompat
* Clean-up several comments in reflection.py
* Fix try\_clean not getting the job\_path
* Updated from global requirements
* Rename uuid to topic
* Fixups for threads\_count usage and logging
* Use the stop watch utility instead of custom timing
* Unify usage of storage error exception type
* Add zookeeper job/jobboard impl
* Updated from global requirements
* Removed copyright from empty files
* Remove extraneous vim configuration comments
* Use six.text\_type() instead of str() in sqlalchemy backend
* Fix dummy lock missing pending\_writers method
* Move some common/to be shared kazoo utils to kazoo\_utils
* Switch to using the type checking decode\_json
* Fix few spelling and grammar errors
* Fixed spelling error
* Run action-engine tests with worker-based engine
* Message-oriented worker-based flow with kombu
* Check atom doesn't provide and return same values
* Fix command for pylint tox env
* Remove locale overrides form tox template
* Reduce test and optional requirements to global requirements
* Rework sphinx documentation
* Remove extraneous vim configuration comments
* Sync with global requirements
* Instead of doing set diffing just partition when state checking
* Add ZooKeeper backend to examples
* Storage protects lower level backend against thread safety
* Remove tox locale overrides
* Update .gitreview after repo rename
* Small storage tests clean-up
* Support building wheels (PEP-427)

0.1.3
-----

* Add validate() base method
* Fix deadlock on waiting for pending\_writers to be empty
* Rename self.\_zk to self.\_client
* Use listener instead of AutoSuspendTask in test\_suspend\_flow
* Use test utils in test\_suspend\_flow
* Use reader/writer locks in storage
* Allow the usage of a passed in sqlalchemy engine
* Be really careful with non-ascii data in exceptions/failures
* Run zookeeper tests if localhost has a compat. zookeeper server
* Add optional-requirements.txt
* Move kazoo to testenv requirements
* Unpin testtools version and bump subunit to >=0.0.18
* Remove use of str() in utils.misc.Failure
* Be more resilent around import/detection/setup errors
* Some zookeeper persistence improvements/adjustments
* Add a validate method to dir and memory backends
* Update oslo copy to oslo commit 39e1c5c5f39204
* Update oslo.lock from incubator commit 3c125e66d183
* Refactor task/flow flattening
* Engine tests refactoring
* Tests: don't pass 'values' to task constructor
* Test fetching backends via entry points
* Pin testtools to 0.9.34 in test requirements
* Ensure we register the new zookeeper backend as an entrypoint
* Implement ZooKeeper as persistence storage backend
* Use addCleanup instead of tearDown in test\_sql\_persistence
* Retain the same api for all helpers
* Update execute/revert comments
* Added more unit tests for Task and FunctorTask
* Doc strings and comments clean-up
* List examples function doesn't accept arguments
* Tests: Persistence test mixin fix
* Test using mysql + postgres if available
* Clean-up and improve async-utils tests
* Use already defined PENDING variable
* Add utilities for working with binary data
* Cleanup engine base class
* Engine cleanups
* Update atom comments
* Put full set of requirements to py26, py27 and py33 envs
* Add base class Atom for all flow units
* Add more requirements to cover tox environment
* Put SQLAlchemy requirements on single line
* Proper exception raised from check\_task\_transition
* Fix function name typo in persistence utils
* Use the same way of assert isinstance in all tests
* Minor cleanup in test\_examples
* Add possibility to create Failure from exception
* Exceptions cleanup
* Alter is\_locked() helper comment
* Add a setup.cfg keywords to describe taskflow
* Use the released toxgen tool instead of our copy

0.1.2
-----

* Move autobinding to task base class
* Assert functor task revert/execute are callable
* Use the six callback checker
* Add envs for different sqlalchemy versions
* Refactor task handler binding
* Move six to the right location
* Use constants for the execution event strings
* Added htmlcov folder to .gitignore
* Reduce visibility of task\_action
* Change internal data store of LogBook from list to dict
* Misc minor fixes to taskflow/examples
* Add connection\_proxy param
* Ignore doc build files
* Fix spelling errors
* Switch to just using tox
* Enable H202 warning for flake8
* Check tasks should not provide same values
* Allow max\_backoff and use count instead of attempts
* Skip invariant checking and adding when nothing provided
* Avoid not\_done naming conflict
* Add stronger checking of backend configuration
* Raise type error instead of silencing it
* Move the container fetcher function to utils
* Explicitly list the valid transitions to RESUMING state
* Name the graph property the same as in engine
* Bind outside of the try block
* Graph action refactoring
* Add make\_completed\_future to async\_utils
* Update oslo-incubator copy to oslo-incubator commit 8b2b0b743
* Ensure that mysql traditional mode is enabled
* Move async utils to own file
* Update requirements from opentack/requirements
* Code cleanup for eventlet\_utils.wait\_fo\_any
* Refactor engine internals
* Add wait\_for\_any method to eventlet utils
* Introduce TaskExecutor
* Run some engine tests with eventlet if it's available
* Do not create TaskAction for each task
* Storage: use names instead of uuids in interface
* Add tests for metadata updates
* Fix sqlalchemy 0.8 issues
* Fix minor python3 incompatibility
* Speed up FlowDetail.find
* Fix misspellings
* Raise exception when trying to run empty flow
* Use update\_task\_metadata in set\_task\_progress
* Capture task duration
* Fix another instance of callback comparison
* Don't forget to return self
* Fixes how instances methods are not deregistered
* Targeted graph flow pattern
* All classes should explicitly inherit object class
* Initial commit of sphinx related files
* Improve is\_valid\_attribute\_name utility function
* Coverage calculation improvements
* Fix up python 3.3 incompatabilities

0.1.1
-----

* Pass flow failures to task's revert method
* Storage: add methods to get all flow failures
* Pbr requirement went missing
* Update code to comply with hacking 0.8.0
* Don't reset tasks to PENDING state while reverting
* Let pbr determine version automatically
* Be more careful when passing result to revert()

0.1
---

* Support for optional task arguments
* Do not erase task progress details
* Storage: restore injected data on resumption
* Inherit the greenpool default size
* Add debug logging showing what is flattened
* Remove incorrect comment
* Unit tests refactoring
* Use py3kcompat.urlutils from oslo instead of six.urllib\_parse
* Update oslo and bring py3kcompat in
* Support several output formats in state\_graph tool
* Remove task\_action state checks
* Wrapped exception doc/intro comment updates
* Doc/intro updates for simple\_linear\_listening
* Add docs/intro to simple\_linear example
* Update intro/comments for reverting\_linear example
* Add docs explaining what/how resume\_volume\_create works
* A few resuming from backend comment adjustments
* Add an introduction to explain resume\_many example
* Increase persistence example comments
* Boost graph flow example comments
* Also allow "\_" to be valid identifier
* Remove uuid from taskflow.flow.Flow
* A few additional example boot\_vm comments + tweaks
* Add a resuming booting vm example
* Add task state verification
* Beef up storage comments
* Removed unused utilities
* Helpers to save flow factory in metadata
* Storage: add flow name and uuid properties
* Create logbook if not provided for create\_flow\_details
* Prepare for 0.1 release
* Comment additions for exponential backoff
* Beef up the action engine comments
* Pattern comment additions/adjustments
* Add more comments to flow/task
* Save with the same connection
* Add a persistence util logbook formatting function
* Rename get\_graph() -> execution\_graph
* Continue adding docs to examples
* Add more comments that explain example & usage
* Add more comments that explain example & usage
* Add more comments that explain example & usage
* Add more comments that explain example & usage
* Fix several python3 incompatibilities
* Python3 compatibility for utils.reflection
* No module name for builtin type and exception names
* Fix python3 compatibility issues in examples
* Fix print statements for python 2/3
* Add a mini-cinder volume create with resumption
* Update oslo copy and bring over versionutils
* Move toward python 3/2 compatible metaclass
* Add a secondary booting vm example
* Resumption from backend for action engine
* A few wording/spelling adjustments
* Create a green executor & green future
* Add a simple mini-billing stack example
* Add a example which uses a sqlite persistence layer
* Add state to dot->svg tool
* Add a set of useful listeners
* Remove decorators and move to utils
* Add reasons as to why the edges were created
* Fix entrypoints being updated/created by update.py
* Validate each flow state change
* Update state sequence for failed flows
* Flow utils and adding comments
* Bump requirements to the latest
* Add a inspect sanity check and note about bound methods
* Some small exception cleanups
* Check for duplicate task names on flattening
* Correctly save task versions
* Allow access by index
* Fix importing of module files
* Wrapping and serializing failures
* Simpler API to load flows into engines
* Avoid setting object variables
* A few adjustments to the progress code
* Cleanup unused states
* Remove d2to dependency
* Warn if multiple providers found
* Memory persistence backend improvements
* Create database from models for SQLite
* Don't allow mutating operations on the underlying graph
* Add graph density
* Suspend single and multi threaded engines
* Remove old tests for unexisted flow types
* Boot fake vm example fixed
* Export graph to dot util
* Remove unused utility classes
* Remove black list of graph flow
* Task decorator was removed and examples updated
* Remove weakref usage
* Add basic sanity tests for unordered flow
* Clean up job/jobboard code
* Add a directory/filesystem based persistence layer
* Remove the older (not used) resumption mechanism
* Reintegrate parallel action
* Add a flow flattening util
* Allow to specify default provides at task definition
* Graph flow, sequential graph action
* Task progress
* Verify provides and requires
* Remap the emails of the committers
* Use executors instead of pools
* Fix linked exception forming
* Remove threaded and distributed flows
* Add check that task provides all results it should
* Use six string types instead of basestring
* Remove usage of oslo.db and oslo.config
* Move toward using a backend+connection model
* Add provides and requires properties to Flow
* Fixed crash when running the engine
* Remove the common config since its not needed
* Allow the lock decorator to take a list
* Allow provides to be a set and results to be a dictionary
* Allow engines to be copied + blacklist broken flows
* Add link to why we have to make this factory due to late binding
* Use the lock decorator and close/join the thread pool
* Engine, task, linear\_flow unification
* Combine multiple exceptions into a linked one
* Converted some examples to use patterns/engines
* MultiThreaded engine and parallel action
* State management for engines
* Action engine: save task results
* Initial implementation of action-based engine
* Further updates to update.py
* Split utils module
* Rename Task.\_\_call\_\_ to Task.execute
* Reader/writer no longer used
* Rename "revert\_with" => "revert" and "execute\_with" to "execute"
* Notify on task reversion
* Have runner keep the exception
* Use distutil version classes
* Add features to task.Task
* Add get\_required\_callable\_args utility function
* Add get\_callable\_name utility function
* Require uuid + move functor\_task to task.py
* Check examples when running tests
* Use the same root test class
* LazyPluggable is no longer used
* Add a locally running threaded flow
* Change namings in functor\_task and add docs to its \_\_init\_\_
* Rework the persistence layer
* Do not have the runner modify the uuid
* Refactor decorators
* Nicer way to make task out of any callable
* Use oslo's sqlalchemy layer
* File movements
* Added Backend API Database Implementation
* Added Memory Persistence API and Generic Datatypes
* Resync the latest oslo code
* Remove openstack.common.exception usage
* Forgot to move this one to the right folder
* Add a new simple calculator example
* Quiet the provider linking
* Deep-copy not always possible
* Add a example which simulates booting a vm
* Add a more complicated graph example
* Move examples under the source tree
* Adjust a bunch of hacking violations
* Fix typos in test\_linear\_flow.py and simple\_linear\_listening.py
* Fix minor code style
* Fix two minor bugs in docs/examples
* Show file modifications and fix dirpath based on config file
* Add a way to use taskflow until library stabilized
* Provide the length of the flows
* Parents should be frozen after creation
* Allow graph dependencies to be manually provided
* Add helper reset internals function
* Move to using pbr
* Unify creation/usage of uuids
* Use the runner interface as the best task lookup
* Ensure we document and complete correct removal
* Pass runners instead of task objects/uuids
* Move how resuming is done to be disconnected from jobs/flows
* Clear out before connecting
* Make connection/validation of tasks be after they are added
* Add helper to do notification
* Store results by add() uuid instead of in array format
* Integrate better locking and a runner helper class
* Cleaning up various components
* Move some of the ordered flow helper classes to utils
* Allow instance methods to be wrapped and unwrapped correctly
* Add a start of a few simple examples
* Update readme to point to links
* Fix most of the hacking rules
* Fix all flake8 E\* and F\* errors
* Fix the current flake8 errors
* Don't keep the state/version in the task name
* Dinky change to trigger jenkins so I can cleanup
* Add the task to the accumulator before running
* Add .settings and .venv into .gitignore
* Fix tests for python 2.6
* Add the ability to soft\_reset a workflow
* Add a .gitreview file so that git-review works
* Ensure we have an exception and capture the exc\_info
* Update how graph results are fetched when they are optional
* Allow for optional task requirements
* We were not notifying when errors occured so fix that
* Bring over the nova get\_wrapped\_function helper and use it
* Allow for passing in the metadata when creating a task detail entry
* Update how the version task functor attribute is found
* Remove more tabs incidents
* Removed test noise and formatted for pep8
* Continue work on decorator usage
* Ensure we pickup the packages
* Fixed pep8 formatting... Finally
* Add flow disassociation and adjust the assocate path
* Add a setup.cfg and populate it with a default set of nosetests options
* Fix spacing
* Add a better task name algorithm
* Add a major/minor version
* Add a get many attr/s and join helper functions
* Reduce test noise
* Fix a few unit tests due to changes
* Ensure we handle functor names and resetting correctly
* Remove safe\_attr
* Modifying db tests
* Removing .pyc
* Fixing .py in .gitignore
* Update db api test
* DB api test cases and revisions
* Allow for turning off auto-extract and add a test
* Use a function to filter args and add comments
* Use update instead of overwrite
* Move decorators to new file and update to use better wraps()
* Continue work with decorator usage
* Update with adding a provides and requires decorator for standalone function usage
* Instead of apply use \_\_call\_\_
* Add comment to why we accumulate before notifying task listeners
* Use a default sqlite backing using a taskflow file
* Add a basic rollback accumlator test
* Use rollback accumulator and remove requires()/provides() from being functions
* Allow (or disallow) multiple providers of items
* Clean the lines in a seperate function
* Resync with oslo-incubator
* Remove uuid since we are now using uuidutils
* Remove error code not found in strict version of pylint
* Include more dev testing packages + matching versions
* Update dependencies for new db/distributed backends
* Move some of the functions to use there openstack/common counterparts
* More import fixups
* Patch up the imports
* Fix syntax error
* Rename cause -> exception and make exception optional
* Allow any of the previous tasks to satisfy requirements
* Ensure we change the self and parents states correctly
* Always have a name provided
* Cleaning up files/extraneous files/fixing relations
* More pylint cleanups
* Make more tests for linear and shuffle test utils to common file
* Only do differences on set objects
* Ensure we fetch the appropriate inputs for the running task
* Have the linear workflow verify the tasks inputs
* Specify that task provides/requires must be an immutable set
* Clean Up for DB changes
* db api defined
* Fleshing out sqlalchemy api
* Almost done with sqlalchemy api
* Fix state check
* Fix flow exception wording
* Ensure job is pending before we associate and run
* More pylint cleanups
* Ensure we associate with parent flows as well
* Add a nice run() method to the job class that will run a flow
* Massive pylint cleanup
* deleting .swp files
* deleting .swp files
* cleaning for initial pull request
* Add a few more graph ordering test cases
* Update automatic naming and arg checks
* Update order calls and connect call
* Move flow failure to flow file and correctly catch ordering failure
* Just kidding - really fixing relations this time
* Fixing table relations
* Allow job id to be passed in
* Check who is being connected to and ensure > 0 connectors
* Move the await function to utils
* Graph tests and adjustments releated to
* Add graph flow tests
* Fix name changes missed
* Enable extraction of what a functor requires from its args
* Called flow now, not workflow
* Second pass at models
* More tests
* Simplify existence checks
* More pythonic functions and workflow -> flow renaming
* Added more utils, added model for workflow
* Spelling errors and stuff
* adding parentheses to read method
* Implemented basic sqlalchemy session class
* Setting up Configs and SQLAlchemy/DB backend
* Fix the import
* Use a different logger method if tolerant vs not tolerant
* More function comments
* Add a bunch of linear workflow tests
* Allow resuming stage to be interrupted
* Fix the missing context variable
* Moving over celery/distributed workflows
* Update description wording
* Pep fix
* Instead of using notify member functions, just use functors
* More wording fixes
* Add the ability to alter the task failure reconcilation
* Correctly run the tasks after partial resumption
* Another wording fix
* Spelling fix
* Allow the functor task to take a name and provide it a default
* Updated functor task comments
* Move some of the useful helpers and functions to other files
* Add the ability to associate a workflow with a job
* Move the useful functor wrapping task from test to wrappers file
* Add a thread posting/claiming example and rework tests to use it
* After adding reposting/unclaiming reflect those changes here
* Add a nicer string name that shows what the class name is
* Adjust some of the states jobs and workflows could be in
* Add a more useful name that shows this is a task
* Remove impl of erasing which doesn't do much and allow for job reposting
* Various reworkings
* Rename logbook contents
* Get a memory test example working
* Add a pylintrc file to be used with pylint
* Rework the logbook to be chapter/page based
* Move ordered workflow to its own file
* Increase the number of comments
* Start adding in a more generic DAG based workflow
* Remove dict\_provider dependency
* Rework due to code comments
* Begin adding testing functionality
* Fill in the majority of the memory job
* Rework how we should be using lists instead of ordereddicts for optimal usage
* Add a context manager to the useful read/writer lock
* Ensure that the task has a name
* Add a running state which can be used to know when a workflow is running
* Rename the date created field
* Add some search functionality and adjust the await() function params
* Remove and add a few new exceptions
* Shrink down the exposed methods
* Remove the promise object for now
* Add RESUMING
* Fix spelling
* Continue on getting ready for the memory impl. to be useful
* On python <= 2.6 we need to import ordereddict
* Remove a few other references to nova
* Add in openstack common and remove patch references
* Move simplification over
* Continue moving here
* Update README.md
* Update readme
* Move the code over for now
* Initial commit
