Module: Concurrent::Promises::FactoryMethods — Concurrent Ruby

# Module: Concurrent::Promises::FactoryMethods

Extended by:
  ReInclude

Includes:
  Configuration, NewChannelIntegration

Included in:
  Concurrent::Promises

Defined in:
  lib/concurrent/promises.rb,
  lib-edge/concurrent/edge/promises.rb,
  lib-edge/concurrent/edge/old_channel_integration.rb

## Overview

Container of all Future, Event factory methods. They are never constructed directly with new.

## Defined Under Namespace

Modules: Configuration, NewChannelIntegration

## Instance Method Summary collapse

- #any_event(*futures_and_or_events) ⇒ Future

  Shortcut of #any_event_on with default `:io` executor supplied.

- #any_event_on(default_executor, *futures_and_or_events) ⇒ Event

  Creates new event which becomes resolved after first of the futures_and_or_events resolves.

- #any_fulfilled_future(*futures_and_or_events) ⇒ Future

  Shortcut of #any_fulfilled_future_on with default `:io` executor supplied.

- #any_fulfilled_future_on(default_executor, *futures_and_or_events) ⇒ Future

  Creates new future which is resolved after first of futures_and_or_events is fulfilled.

- #any_resolved_future(*futures_and_or_events) ⇒ Future (also: #any)

  Shortcut of #any_resolved_future_on with default `:io` executor supplied.

- #any_resolved_future_on(default_executor, *futures_and_or_events) ⇒ Future

  Creates new future which is resolved after first futures_and_or_events is resolved.

- #default_executor ⇒ Executor, :io, :fast included from Configuration

  The executor which is used when none is supplied to a factory method.

- #delay(*args, &task) ⇒ Future

  Shortcut of #delay_on with default `:io` executor supplied.

- #delay_on(default_executor, *args) {|*args| ... } ⇒ Future

  Constructs new Future which will be resolved after block is evaluated on default executor.

- #fulfilled_future(value, default_executor = self.default_executor) ⇒ Future

  Creates resolved future with will be fulfilled with the given value.

- #future(*args, &task) ⇒ Future

  Shortcut of #future_on with default `:io` executor supplied.

- #future_on(default_executor, *args) {|*args| ... } ⇒ Future

  Constructs new Future which will be resolved after block is evaluated on default executor.

- #make_future(argument = nil, default_executor = self.default_executor) ⇒ Event, Future

  General constructor.

- #rejected_future(reason, default_executor = self.default_executor) ⇒ Future

  Creates resolved future with will be rejected with the given reason.

- #resolvable_event ⇒ ResolvableEvent

  Shortcut of #resolvable_event_on with default `:io` executor supplied.

- #resolvable_event_on(default_executor = self.default_executor) ⇒ ResolvableEvent

  Created resolvable event, user is responsible for resolving the event once by ResolvableEvent#resolve.

- #resolvable_future ⇒ ResolvableFuture

  Shortcut of #resolvable_future_on with default `:io` executor supplied.

- #resolvable_future_on(default_executor = self.default_executor) ⇒ ResolvableFuture

  Creates resolvable future, user is responsible for resolving the future once by ResolvableFuture#resolve, ResolvableFuture#fulfill, or ResolvableFuture#reject.

- #resolved_event(default_executor = self.default_executor) ⇒ Event

  Creates resolved event.

- #resolved_future(fulfilled, value, reason, default_executor = self.default_executor) ⇒ Future

  Creates resolved future with will be either fulfilled with the given value or rejection with the given reason.

- #schedule(intended_time, *args, &task) ⇒ Future

  Shortcut of #schedule_on with default `:io` executor supplied.

- #schedule_on(default_executor, intended_time, *args) {|*args| ... } ⇒ Future

  Constructs new Future which will be resolved after block is evaluated on default executor.

- #select_channel(*channels) ⇒ Future included from NewChannelIntegration

  Selects a channel which is ready to be read from.

- #zip_events(*futures_and_or_events) ⇒ Event

  Shortcut of #zip_events_on with default `:io` executor supplied.

- #zip_events_on(default_executor, *futures_and_or_events) ⇒ Event

  Creates new event which is resolved after all futures_and_or_events are resolved.

- #zip_futures(*futures_and_or_events) ⇒ Future (also: #zip)

  Shortcut of #zip_futures_on with default `:io` executor supplied.

- #zip_futures_on(default_executor, *futures_and_or_events) ⇒ Future

  Creates new future which is resolved after all futures_and_or_events are resolved.

- #zip_futures_over(enumerable, &future_factory) ⇒ Future

  Shortcut of #zip_futures_over_on with default `:io` executor supplied.

- #zip_futures_over_on(default_executor, enumerable) {|element| ... } ⇒ Future

  Creates new future which is resolved after all the futures created by future_factory from enumerable elements are resolved.

## Instance Method Details

### #any_event(*futures_and_or_events) ⇒ `Future`

Shortcut of #any_event_on with default `:io` executor supplied.

Returns:

- (`Future`)

See Also:

- #any_event_on

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    # File 'lib/concurrent/promises.rb', line 294

    def any_event(*futures_and_or_events)
      any_event_on default_executor, *futures_and_or_events
    end

### #any_event_on(default_executor, *futures_and_or_events) ⇒ `Event`

Creates new event which becomes resolved after first of the futures_and_or_events resolves. If resolved it does not propagate AbstractEventFuture#touch, leaving delayed futures un-executed if they are not required any more.

Parameters:

- default_executor (`Executor`, `:io`, `:fast`) —

  Instance of an executor or a name of the global executor. Default executor propagates to chained futures unless overridden with executor parameter or changed with AbstractEventFuture#with_default_executor.

- futures_and_or_events (`AbstractEventFuture`)

Returns:

- (`Event`)

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    # File 'lib/concurrent/promises.rb', line 304

    def any_event_on(default_executor, *futures_and_or_events)
      AnyResolvedEventPromise.new_blocked_by(futures_and_or_events, default_executor).event
    end

### #any_fulfilled_future(*futures_and_or_events) ⇒ `Future`

Shortcut of #any_fulfilled_future_on with default `:io` executor supplied.

Returns:

- (`Future`)

See Also:

- #any_fulfilled_future_on

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    # File 'lib/concurrent/promises.rb', line 275

    def any_fulfilled_future(*futures_and_or_events)
      any_fulfilled_future_on default_executor, *futures_and_or_events
    end

### #any_fulfilled_future_on(default_executor, *futures_and_or_events) ⇒ `Future`

Creates new future which is resolved after first of futures_and_or_events is fulfilled. Its result equals result of the first resolved future or if all futures_and_or_events reject, it has reason of the last resolved future. If resolved it does not propagate AbstractEventFuture#touch, leaving delayed futures un-executed if they are not required any more. If event is supplied, which does not have value and can be only resolved, it's represented as `:fulfilled` with value `nil`.

Parameters:

- default_executor (`Executor`, `:io`, `:fast`) —

  Instance of an executor or a name of the global executor. Default executor propagates to chained futures unless overridden with executor parameter or changed with AbstractEventFuture#with_default_executor.

- futures_and_or_events (`AbstractEventFuture`)

Returns:

- (`Future`)

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    # File 'lib/concurrent/promises.rb', line 288

    def any_fulfilled_future_on(default_executor, *futures_and_or_events)
      AnyFulfilledFuturePromise.new_blocked_by(futures_and_or_events, default_executor).future
    end

### #any_resolved_future(*futures_and_or_events) ⇒ `Future` Also known as: any

Shortcut of #any_resolved_future_on with default `:io` executor supplied.

Returns:

- (`Future`)

See Also:

- #any_resolved_future_on

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    # File 'lib/concurrent/promises.rb', line 253

    def any_resolved_future(*futures_and_or_events)
      any_resolved_future_on default_executor, *futures_and_or_events
    end

### #any_resolved_future_on(default_executor, *futures_and_or_events) ⇒ `Future`

Creates new future which is resolved after first futures_and_or_events is resolved. Its result equals result of the first resolved future. If resolved it does not propagate AbstractEventFuture#touch, leaving delayed futures un-executed if they are not required any more. If event is supplied, which does not have value and can be only resolved, it's represented as `:fulfilled` with value `nil`.

Parameters:

- default_executor (`Executor`, `:io`, `:fast`) —

  Instance of an executor or a name of the global executor. Default executor propagates to chained futures unless overridden with executor parameter or changed with AbstractEventFuture#with_default_executor.

- futures_and_or_events (`AbstractEventFuture`)

Returns:

- (`Future`)

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    # File 'lib/concurrent/promises.rb', line 269

    def any_resolved_future_on(default_executor, *futures_and_or_events)
      AnyResolvedFuturePromise.new_blocked_by(futures_and_or_events, default_executor).future
    end

### #default_executor ⇒ `Executor`, `:io`, `:fast` Originally defined in module Configuration

Returns the executor which is used when none is supplied to a factory method. The method can be overridden in the receivers of `include FactoryMethod`

Returns:

- (`Executor`, `:io`, `:fast`) —

  the executor which is used when none is supplied to a factory method. The method can be overridden in the receivers of `include FactoryMethod`

### #delay(*args, &task) ⇒ `Future`

Shortcut of #delay_on with default `:io` executor supplied.

Returns:

- (`Future`)

See Also:

- #delay_on

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    # File 'lib/concurrent/promises.rb', line 184

    def delay(*args, &task)
      delay_on default_executor, *args, &task
    end

### #delay_on(default_executor, *args) {|*args| ... } ⇒ `Future`

Constructs new Future which will be resolved after block is evaluated on default executor. The task will be evaluated only after the future is touched, see AbstractEventFuture#touch

Parameters:

- default_executor (`Executor`, `:io`, `:fast`) —

  Instance of an executor or a name of the global executor. Default executor propagates to chained futures unless overridden with executor parameter or changed with AbstractEventFuture#with_default_executor.

- args (`Object`) —

  arguments which are passed to the task when it's executed. (It might be prepended with other arguments, see the @yeild section).

Yields:

- (`*args`) —

  to the task.

Yield Returns:

- will become result of the returned Future. Its returned value becomes Concurrent::Promises::Future#value fulfilling it, raised exception becomes Concurrent::Promises::Future#reason rejecting it.

Returns:

- (`Future`)

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    # File 'lib/concurrent/promises.rb', line 192

    def delay_on(default_executor, *args, &task)
      DelayPromise.new(default_executor).event.chain(*args, &task)
    end

### #fulfilled_future(value, default_executor = self.default_executor) ⇒ `Future`

Creates resolved future with will be fulfilled with the given value.

Parameters:

- default_executor (`Executor`, `:io`, `:fast`) (defaults to: `self.default_executor`) —

  Instance of an executor or a name of the global executor. Default executor propagates to chained futures unless overridden with executor parameter or changed with AbstractEventFuture#with_default_executor.

Returns:

- (`Future`)

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    # File 'lib/concurrent/promises.rb', line 122

    def fulfilled_future(value, default_executor = self.default_executor)
      resolved_future true, value, nil, default_executor
    end

### #future(*args, &task) ⇒ `Future`

Shortcut of #future_on with default `:io` executor supplied.

Returns:

- (`Future`)

See Also:

- #future_on

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    # File 'lib/concurrent/promises.rb', line 91

    def future(*args, &task)
      future_on(default_executor, *args, &task)
    end

### #future_on(default_executor, *args) {|*args| ... } ⇒ `Future`

Constructs new Future which will be resolved after block is evaluated on default executor. Evaluation begins immediately.

Parameters:

- default_executor (`Executor`, `:io`, `:fast`) —

  Instance of an executor or a name of the global executor. Default executor propagates to chained futures unless overridden with executor parameter or changed with AbstractEventFuture#with_default_executor.

- args (`Object`) —

  arguments which are passed to the task when it's executed. (It might be prepended with other arguments, see the @yeild section).

Yields:

- (`*args`) —

  to the task.

Yield Returns:

- will become result of the returned Future. Its returned value becomes Concurrent::Promises::Future#value fulfilling it, raised exception becomes Concurrent::Promises::Future#reason rejecting it.

Returns:

- (`Future`)

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    # File 'lib/concurrent/promises.rb', line 105

    def future_on(default_executor, *args, &task)
      ImmediateEventPromise.new(default_executor).future.then(*args, &task)
    end

### #create(nil, default_executor = self.default_executor) ⇒ `Event` #create(a_future, default_executor = self.default_executor) ⇒ `Future` #create(an_event, default_executor = self.default_executor) ⇒ `Event` #create(exception, default_executor = self.default_executor) ⇒ `Future` #create(value, default_executor = self.default_executor) ⇒ `Future`

General constructor. Behaves differently based on the argument's type. It's provided for convenience but it's better to be explicit.

Overloads:

- #create(nil, default_executor = self.default_executor) ⇒ `Event`

  Returns resolved event.

  Parameters:

  - nil (`nil`)

  Returns:

  - (`Event`) —

    resolved event.

- #create(a_future, default_executor = self.default_executor) ⇒ `Future`

  Returns a future which will be resolved when a_future is.

  Parameters:

  - a_future (`Future`)

  Returns:

  - (`Future`) —

    a future which will be resolved when a_future is.

- #create(an_event, default_executor = self.default_executor) ⇒ `Event`

  Returns an event which will be resolved when an_event is.

  Parameters:

  - an_event (`Event`)

  Returns:

  - (`Event`) —

    an event which will be resolved when an_event is.

- #create(exception, default_executor = self.default_executor) ⇒ `Future`

  Returns a rejected future with the exception as its reason.

  Parameters:

  - exception (`Exception`)

  Returns:

  - (`Future`) —

    a rejected future with the exception as its reason.

- #create(value, default_executor = self.default_executor) ⇒ `Future`

  Returns a fulfilled future with the value.

  Parameters:

  - value (`Object`) —

    when none of the above overloads fits

  Returns:

  - (`Future`) —

    a fulfilled future with the value.

Parameters:

- default_executor (`Executor`, `:io`, `:fast`) (defaults to: `self.default_executor`) —

  Instance of an executor or a name of the global executor. Default executor propagates to chained futures unless overridden with executor parameter or changed with AbstractEventFuture#with_default_executor.

Returns:

- (`Event`, `Future`)

See Also:

- resolved_event, fulfilled_future

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    # File 'lib/concurrent/promises.rb', line 168

    def make_future(argument = nil, default_executor = self.default_executor)
      case argument
      when AbstractEventFuture
        # returning wrapper would change nothing
        argument
      when Exception
        rejected_future argument, default_executor
      when nil
        resolved_event default_executor
      else
        fulfilled_future argument, default_executor
      end
    end

### #rejected_future(reason, default_executor = self.default_executor) ⇒ `Future`

Creates resolved future with will be rejected with the given reason.

Parameters:

- default_executor (`Executor`, `:io`, `:fast`) (defaults to: `self.default_executor`) —

  Instance of an executor or a name of the global executor. Default executor propagates to chained futures unless overridden with executor parameter or changed with AbstractEventFuture#with_default_executor.

Returns:

- (`Future`)

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    # File 'lib/concurrent/promises.rb', line 130

    def rejected_future(reason, default_executor = self.default_executor)
      resolved_future false, nil, reason, default_executor
    end

### #resolvable_event ⇒ `ResolvableEvent`

Shortcut of #resolvable_event_on with default `:io` executor supplied.

Returns:

- (`ResolvableEvent`)

See Also:

- #resolvable_event_on

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    # File 'lib/concurrent/promises.rb', line 60

    def resolvable_event
      resolvable_event_on default_executor
    end

### #resolvable_event_on(default_executor = self.default_executor) ⇒ `ResolvableEvent`

Created resolvable event, user is responsible for resolving the event once by ResolvableEvent#resolve.

Parameters:

- default_executor (`Executor`, `:io`, `:fast`) (defaults to: `self.default_executor`) —

  Instance of an executor or a name of the global executor. Default executor propagates to chained futures unless overridden with executor parameter or changed with AbstractEventFuture#with_default_executor.

Returns:

- (`ResolvableEvent`)

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    # File 'lib/concurrent/promises.rb', line 69

    def resolvable_event_on(default_executor = self.default_executor)
      ResolvableEventPromise.new(default_executor).future
    end

### #resolvable_future ⇒ `ResolvableFuture`

Shortcut of #resolvable_future_on with default `:io` executor supplied.

Returns:

- (`ResolvableFuture`)

See Also:

- #resolvable_future_on

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    # File 'lib/concurrent/promises.rb', line 75

    def resolvable_future
      resolvable_future_on default_executor
    end

### #resolvable_future_on(default_executor = self.default_executor) ⇒ `ResolvableFuture`

Creates resolvable future, user is responsible for resolving the future once by ResolvableFuture#resolve, ResolvableFuture#fulfill, or ResolvableFuture#reject

Parameters:

- default_executor (`Executor`, `:io`, `:fast`) (defaults to: `self.default_executor`) —

  Instance of an executor or a name of the global executor. Default executor propagates to chained futures unless overridden with executor parameter or changed with AbstractEventFuture#with_default_executor.

Returns:

- (`ResolvableFuture`)

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    # File 'lib/concurrent/promises.rb', line 85

    def resolvable_future_on(default_executor = self.default_executor)
      ResolvableFuturePromise.new(default_executor).future
    end

### #resolved_event(default_executor = self.default_executor) ⇒ `Event`

Creates resolved event.

Parameters:

- default_executor (`Executor`, `:io`, `:fast`) (defaults to: `self.default_executor`) —

  Instance of an executor or a name of the global executor. Default executor propagates to chained futures unless overridden with executor parameter or changed with AbstractEventFuture#with_default_executor.

Returns:

- (`Event`)

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    # File 'lib/concurrent/promises.rb', line 138

    def resolved_event(default_executor = self.default_executor)
      ImmediateEventPromise.new(default_executor).event
    end

### #resolved_future(fulfilled, value, reason, default_executor = self.default_executor) ⇒ `Future`

Creates resolved future with will be either fulfilled with the given value or rejection with the given reason.

Parameters:

- default_executor (`Executor`, `:io`, `:fast`) (defaults to: `self.default_executor`) —

  Instance of an executor or a name of the global executor. Default executor propagates to chained futures unless overridden with executor parameter or changed with AbstractEventFuture#with_default_executor.

Returns:

- (`Future`)

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    # File 'lib/concurrent/promises.rb', line 114

    def resolved_future(fulfilled, value, reason, default_executor = self.default_executor)
      ImmediateFuturePromise.new(default_executor, fulfilled, value, reason).future
    end

### #schedule(intended_time, *args, &task) ⇒ `Future`

Shortcut of #schedule_on with default `:io` executor supplied.

Returns:

- (`Future`)

See Also:

- #schedule_on

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    # File 'lib/concurrent/promises.rb', line 198

    def schedule(intended_time, *args, &task)
      schedule_on default_executor, intended_time, *args, &task
    end

### #schedule_on(default_executor, intended_time, *args) {|*args| ... } ⇒ `Future`

Constructs new Future which will be resolved after block is evaluated on default executor. The task is planned for execution in intended_time.

Parameters:

- default_executor (`Executor`, `:io`, `:fast`) —

  Instance of an executor or a name of the global executor. Default executor propagates to chained futures unless overridden with executor parameter or changed with AbstractEventFuture#with_default_executor.

- args (`Object`) —

  arguments which are passed to the task when it's executed. (It might be prepended with other arguments, see the @yeild section).

- intended_time (`Numeric`, `Time`) —

  `Numeric` means to run in `intended_time` seconds. `Time` means to run on `intended_time`.

Yields:

- (`*args`) —

  to the task.

Yield Returns:

- will become result of the returned Future. Its returned value becomes Concurrent::Promises::Future#value fulfilling it, raised exception becomes Concurrent::Promises::Future#reason rejecting it.

Returns:

- (`Future`)

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    # File 'lib/concurrent/promises.rb', line 209

    def schedule_on(default_executor, intended_time, *args, &task)
      ScheduledPromise.new(default_executor, intended_time).event.chain(*args, &task)
    end

### #select_channel(*channels) ⇒ `Future` Originally defined in module NewChannelIntegration

Selects a channel which is ready to be read from.

Parameters:

- channels (`Channel`)

Returns:

- (`Future`) —

  a future which is fulfilled with pair [channel, message] when one of the channels is available for reading

### #zip_events(*futures_and_or_events) ⇒ `Event`

Shortcut of #zip_events_on with default `:io` executor supplied.

Returns:

- (`Event`)

See Also:

- #zip_events_on

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    # File 'lib/concurrent/promises.rb', line 237

    def zip_events(*futures_and_or_events)
      zip_events_on default_executor, *futures_and_or_events
    end

### #zip_events_on(default_executor, *futures_and_or_events) ⇒ `Event`

Creates new event which is resolved after all futures_and_or_events are resolved. (Future is resolved when fulfilled or rejected.)

Parameters:

- default_executor (`Executor`, `:io`, `:fast`) —

  Instance of an executor or a name of the global executor. Default executor propagates to chained futures unless overridden with executor parameter or changed with AbstractEventFuture#with_default_executor.

- futures_and_or_events (`AbstractEventFuture`)

Returns:

- (`Event`)

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    # File 'lib/concurrent/promises.rb', line 247

    def zip_events_on(default_executor, *futures_and_or_events)
      ZipEventsPromise.new_blocked_by(futures_and_or_events, default_executor).event
    end

### #zip_futures(*futures_and_or_events) ⇒ `Future` Also known as: zip

Shortcut of #zip_futures_on with default `:io` executor supplied.

Returns:

- (`Future`)

See Also:

- #zip_futures_on

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    # File 'lib/concurrent/promises.rb', line 215

    def zip_futures(*futures_and_or_events)
      zip_futures_on default_executor, *futures_and_or_events
    end

### #zip_futures_on(default_executor, *futures_and_or_events) ⇒ `Future`

Creates new future which is resolved after all futures_and_or_events are resolved. Its value is array of zipped future values. Its reason is array of reasons for rejection. If there is an error it rejects. If event is supplied, which does not have value and can be only resolved, it's represented as `:fulfilled` with value `nil`.

Parameters:

- default_executor (`Executor`, `:io`, `:fast`) —

  Instance of an executor or a name of the global executor. Default executor propagates to chained futures unless overridden with executor parameter or changed with AbstractEventFuture#with_default_executor.

- futures_and_or_events (`AbstractEventFuture`)

Returns:

- (`Future`)

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    # File 'lib/concurrent/promises.rb', line 229

    def zip_futures_on(default_executor, *futures_and_or_events)
      ZipFuturesPromise.new_blocked_by(futures_and_or_events, default_executor).future
    end

### #zip_futures_over(enumerable, &future_factory) ⇒ `Future`

Note:

Edge Features are under active development and may change frequently.

- Deprecations are not added before incompatible changes.
- Edge version: major is always 0, minor bump means incompatible change, patch bump means compatible change.
- Edge features may also lack tests and documentation.
- Features developed in `concurrent-ruby-edge` are expected to move to `concurrent-ruby` when finalised.

Shortcut of #zip_futures_over_on with default `:io` executor supplied.

Returns:

- (`Future`)

See Also:

- #zip_futures_over_on

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    # File 'lib-edge/concurrent/edge/promises.rb', line 179

    def zip_futures_over(enumerable, &future_factory)
      zip_futures_over_on default_executor, enumerable, &future_factory
    end

### #zip_futures_over_on(default_executor, enumerable) {|element| ... } ⇒ `Future`

Note:

Edge Features are under active development and may change frequently.

- Deprecations are not added before incompatible changes.
- Edge version: major is always 0, minor bump means incompatible change, patch bump means compatible change.
- Edge features may also lack tests and documentation.
- Features developed in `concurrent-ruby-edge` are expected to move to `concurrent-ruby` when finalised.

Creates new future which is resolved after all the futures created by future_factory from enumerable elements are resolved. Simplified it does: `zip(*enumerable.map { |e| future e, &future_factory })`

Examples:

    # `#succ` calls are executed in parallel
    zip_futures_over_on(:io, [1, 2], &:succ).value! # => [2, 3]

Parameters:

- default_executor (`Executor`, `:io`, `:fast`) —

  Instance of an executor or a name of the global executor. Default executor propagates to chained futures unless overridden with executor parameter or changed with AbstractEventFuture#with_default_executor.

- enumerable (`Enumerable`)

Yields:

- a task to be executed in future

Yield Parameters:

- element (`Object`) —

  from enumerable

Yield Returns:

- (`Object`) —

  a value of the future

Returns:

- (`Future`)

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    # File 'lib-edge/concurrent/edge/promises.rb', line 197

    def zip_futures_over_on(default_executor, enumerable, &future_factory)
      # ZipFuturesPromise.new_blocked_by(futures_and_or_events, default_executor).future
      zip_futures_on(default_executor, *enumerable.map { |e| future e, &future_factory })
    end