Class AbstractTransformFuture<I,O,F,T>
- java.lang.Object
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- com.google.common.util.concurrent.internal.InternalFutureFailureAccess
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- com.google.common.util.concurrent.AbstractFuture<V>
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- com.google.common.util.concurrent.GwtFluentFutureCatchingSpecialization<V>
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- com.google.common.util.concurrent.FluentFuture<V>
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- com.google.common.util.concurrent.FluentFuture.TrustedFuture<O>
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- com.google.common.util.concurrent.AbstractTransformFuture<I,O,F,T>
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- All Implemented Interfaces:
AbstractFuture.Trusted<O>
,ListenableFuture<O>
,java.lang.Runnable
,java.util.concurrent.Future<O>
- Direct Known Subclasses:
AbstractTransformFuture.AsyncTransformFuture
,AbstractTransformFuture.TransformFuture
@GwtCompatible abstract class AbstractTransformFuture<I,O,F,T> extends FluentFuture.TrustedFuture<O> implements java.lang.Runnable
Implementations ofFutures.transform*
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Nested Class Summary
Nested Classes Modifier and Type Class Description private static class
AbstractTransformFuture.AsyncTransformFuture<I,O>
AnAbstractTransformFuture
that delegates to anAsyncFunction
andAbstractFuture.setFuture(ListenableFuture)
.private static class
AbstractTransformFuture.TransformFuture<I,O>
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Nested classes/interfaces inherited from class com.google.common.util.concurrent.FluentFuture
FluentFuture.TrustedFuture<V>
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Nested classes/interfaces inherited from class com.google.common.util.concurrent.AbstractFuture
AbstractFuture.Trusted<V>
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Field Summary
Fields Modifier and Type Field Description (package private) F
function
(package private) ListenableFuture<? extends I>
inputFuture
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Constructor Summary
Constructors Constructor Description AbstractTransformFuture(ListenableFuture<? extends I> inputFuture, F function)
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Method Summary
All Methods Static Methods Instance Methods Abstract Methods Concrete Methods Modifier and Type Method Description protected void
afterDone()
Callback method that is called exactly once after the future is completed.(package private) static <I,O>
ListenableFuture<O>create(ListenableFuture<I> input, Function<? super I,? extends O> function, java.util.concurrent.Executor executor)
(package private) static <I,O>
ListenableFuture<O>create(ListenableFuture<I> input, AsyncFunction<? super I,? extends O> function, java.util.concurrent.Executor executor)
(package private) abstract T
doTransform(F function, I result)
Template method for subtypes to actually run the transform.protected java.lang.String
pendingToString()
Provide a human-readable explanation of why this future has not yet completed.void
run()
(package private) abstract void
setResult(T result)
Template method for subtypes to actually set the result.-
Methods inherited from class com.google.common.util.concurrent.FluentFuture.TrustedFuture
addListener, cancel, get, get, isCancelled, isDone
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Methods inherited from class com.google.common.util.concurrent.FluentFuture
addCallback, catching, catchingAsync, from, from, transform, transformAsync, withTimeout, withTimeout
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Methods inherited from class com.google.common.util.concurrent.AbstractFuture
interruptTask, maybePropagateCancellationTo, set, setException, setFuture, toString, tryInternalFastPathGetFailure, wasInterrupted
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Field Detail
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inputFuture
ListenableFuture<? extends I> inputFuture
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function
F function
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Constructor Detail
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AbstractTransformFuture
AbstractTransformFuture(ListenableFuture<? extends I> inputFuture, F function)
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Method Detail
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create
static <I,O> ListenableFuture<O> create(ListenableFuture<I> input, AsyncFunction<? super I,? extends O> function, java.util.concurrent.Executor executor)
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create
static <I,O> ListenableFuture<O> create(ListenableFuture<I> input, Function<? super I,? extends O> function, java.util.concurrent.Executor executor)
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run
public final void run()
- Specified by:
run
in interfacejava.lang.Runnable
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doTransform
abstract T doTransform(F function, I result) throws java.lang.Exception
Template method for subtypes to actually run the transform.- Throws:
java.lang.Exception
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setResult
abstract void setResult(T result)
Template method for subtypes to actually set the result.
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afterDone
protected final void afterDone()
Description copied from class:AbstractFuture
Callback method that is called exactly once after the future is completed.If
AbstractFuture.interruptTask()
is also run during completion,AbstractFuture.afterDone()
runs after it.The default implementation of this method in
AbstractFuture
does nothing. This is intended for very lightweight cleanup work, for example, timing statistics or clearing fields. If your task does anything heavier consider, just using a listener with an executor.- Overrides:
afterDone
in classAbstractFuture<O>
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pendingToString
protected java.lang.String pendingToString()
Description copied from class:AbstractFuture
Provide a human-readable explanation of why this future has not yet completed.- Overrides:
pendingToString
in classAbstractFuture<O>
- Returns:
- null if an explanation cannot be provided (e.g. because the future is done).
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