Class ForwardingFuture<V>
- java.lang.Object
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- com.google.common.collect.ForwardingObject
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- com.google.common.util.concurrent.ForwardingFuture<V>
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- All Implemented Interfaces:
java.util.concurrent.Future<V>
- Direct Known Subclasses:
ForwardingFuture.SimpleForwardingFuture
,ForwardingListenableFuture
@GwtIncompatible public abstract class ForwardingFuture<V> extends ForwardingObject implements java.util.concurrent.Future<V>
AFuture
which forwards all its method calls to another future. Subclasses should override one or more methods to modify the behavior of the backing future as desired per the decorator pattern.Most subclasses can just use
ForwardingFuture.SimpleForwardingFuture
.- Since:
- 1.0
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Nested Class Summary
Nested Classes Modifier and Type Class Description static class
ForwardingFuture.SimpleForwardingFuture<V>
A simplified version ofForwardingFuture
where subclasses can pass in an already constructedFuture
as the delegate.
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Constructor Summary
Constructors Modifier Constructor Description protected
ForwardingFuture()
Constructor for use by subclasses.
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Method Summary
All Methods Instance Methods Abstract Methods Concrete Methods Modifier and Type Method Description boolean
cancel(boolean mayInterruptIfRunning)
protected abstract java.util.concurrent.Future<? extends V>
delegate()
Returns the backing delegate instance that methods are forwarded to.V
get()
V
get(long timeout, java.util.concurrent.TimeUnit unit)
boolean
isCancelled()
boolean
isDone()
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Methods inherited from class com.google.common.collect.ForwardingObject
toString
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Method Detail
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delegate
protected abstract java.util.concurrent.Future<? extends V> delegate()
Description copied from class:ForwardingObject
Returns the backing delegate instance that methods are forwarded to. Abstract subclasses generally override this method with an abstract method that has a more specific return type, such asForwardingSet.delegate()
. Concrete subclasses override this method to supply the instance being decorated.- Specified by:
delegate
in classForwardingObject
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cancel
public boolean cancel(boolean mayInterruptIfRunning)
- Specified by:
cancel
in interfacejava.util.concurrent.Future<V>
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isCancelled
public boolean isCancelled()
- Specified by:
isCancelled
in interfacejava.util.concurrent.Future<V>
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isDone
public boolean isDone()
- Specified by:
isDone
in interfacejava.util.concurrent.Future<V>
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get
public V get() throws java.lang.InterruptedException, java.util.concurrent.ExecutionException
- Specified by:
get
in interfacejava.util.concurrent.Future<V>
- Throws:
java.lang.InterruptedException
java.util.concurrent.ExecutionException
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get
public V get(long timeout, java.util.concurrent.TimeUnit unit) throws java.lang.InterruptedException, java.util.concurrent.ExecutionException, java.util.concurrent.TimeoutException
- Specified by:
get
in interfacejava.util.concurrent.Future<V>
- Throws:
java.lang.InterruptedException
java.util.concurrent.ExecutionException
java.util.concurrent.TimeoutException
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