V
- The result type returned by this Future's get
method@Beta public abstract class ForwardingListenableFuture<V> extends ForwardingFuture<V> implements ListenableFuture<V>
ForwardingListenableFuture.SimpleForwardingListenableFuture
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 ForwardingListenableFuture.SimpleForwardingListenableFuture
.
Modifier and Type | Class and Description |
---|---|
static class |
ForwardingListenableFuture.SimpleForwardingListenableFuture<V>
A simplified version of
ForwardingListenableFuture where subclasses
can pass in an already constructed ListenableFuture
as the delegate. |
ForwardingFuture.SimpleForwardingFuture<V>
Modifier | Constructor and Description |
---|---|
protected |
ForwardingListenableFuture()
Constructor for use by subclasses.
|
Modifier and Type | Method and Description |
---|---|
void |
addListener(Runnable listener,
Executor exec)
Registers a listener to be run on
the given executor.
|
protected abstract ListenableFuture<V> |
delegate()
Returns the backing delegate instance that methods are forwarded to.
|
cancel, get, get, isCancelled, isDone
toString
protected ForwardingListenableFuture()
protected abstract ListenableFuture<V> delegate()
ForwardingObject
ForwardingSet.delegate()
. Concrete subclasses override this method to supply
the instance being decorated.delegate
in class ForwardingFuture<V>
public void addListener(Runnable listener, Executor exec)
ListenableFuture
Future
's
computation is complete or, if the computation
is already complete, immediately.
There is no guaranteed ordering of execution of listeners, but any listener added through this method is guaranteed to be called once the computation is complete.
Listeners cannot throw checked exceptions and should not throw RuntimeException
unless their executors are prepared to handle it.
Listeners that will execute in MoreExecutors.sameThreadExecutor()
should take special care, since they may run during the call to addListener
or during the call that sets the future's value.
addListener
in interface ListenableFuture<V>
listener
- the listener to run when the computation is completeexec
- the executor to run the listener inCopyright © 2010-2012. All Rights Reserved.