- java.lang.Object
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- com.google.common.util.concurrent.Futures.FutureCombiner<V>
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- Enclosing class:
- Futures
@Beta @CanIgnoreReturnValue @GwtCompatible public static final class Futures.FutureCombiner<V extends @Nullable Object> extends Object
A helper to create a newListenableFuture
whose result is generated from a combination of input futures.See
Futures.whenAllComplete(com.google.common.util.concurrent.ListenableFuture<? extends V>...)
andFutures.whenAllSucceed(com.google.common.util.concurrent.ListenableFuture<? extends V>...)
for how to instantiate this class.Example:
final ListenableFuture<Instant> loginDateFuture = loginService.findLastLoginDate(username); final ListenableFuture<List<String>> recentCommandsFuture = recentCommandsService.findRecentCommands(username); ListenableFuture<UsageHistory> usageFuture = Futures.whenAllSucceed(loginDateFuture, recentCommandsFuture) .call( () -> new UsageHistory( username, Futures.getDone(loginDateFuture), Futures.getDone(recentCommandsFuture)), executor);
- Since:
- 20.0
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description <C extends @Nullable Object>
ListenableFuture<C>call(Callable<C> combiner, Executor executor)
Creates theListenableFuture
which will return the result of callingCallable.call()
incombiner
when all futures complete, using the specifiedexecutor
.<C extends @Nullable Object>
ListenableFuture<C>callAsync(AsyncCallable<C> combiner, Executor executor)
Creates theListenableFuture
which will return the result of callingAsyncCallable.call()
incombiner
when all futures complete, using the specifiedexecutor
.ListenableFuture<?>
run(Runnable combiner, Executor executor)
Creates theListenableFuture
which will return the result of runningcombiner
when all Futures complete.
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Method Detail
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callAsync
public <C extends @Nullable Object> ListenableFuture<C> callAsync(AsyncCallable<C> combiner, Executor executor)
Creates theListenableFuture
which will return the result of callingAsyncCallable.call()
incombiner
when all futures complete, using the specifiedexecutor
.If the combiner throws a
CancellationException
, the returned future will be cancelled.If the combiner throws an
ExecutionException
, the cause of the thrownExecutionException
will be extracted and returned as the cause of the newExecutionException
that gets thrown by the returned combined future.Canceling this future will attempt to cancel all the component futures.
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call
@CanIgnoreReturnValue public <C extends @Nullable Object> ListenableFuture<C> call(Callable<C> combiner, Executor executor)
Creates theListenableFuture
which will return the result of callingCallable.call()
incombiner
when all futures complete, using the specifiedexecutor
.If the combiner throws a
CancellationException
, the returned future will be cancelled.If the combiner throws an
ExecutionException
, the cause of the thrownExecutionException
will be extracted and returned as the cause of the newExecutionException
that gets thrown by the returned combined future.Canceling this future will attempt to cancel all the component futures.
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run
public ListenableFuture<?> run(Runnable combiner, Executor executor)
Creates theListenableFuture
which will return the result of runningcombiner
when all Futures complete.combiner
will run usingexecutor
.If the combiner throws a
CancellationException
, the returned future will be cancelled.Canceling this Future will attempt to cancel all the component futures.
- Since:
- 23.6
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