public abstract class InternalFutureFailureAccess extends Object
This class is used only for micro-optimization. Standard Future
utilities benefit from
this optimization, so there is no need to specialize methods to return or accept this type
instead of ListenableFuture
.
This class is GWT-compatible.
com.google.guava:failureaccess:1.0
, which was added as a dependency of Guava in
Guava 27.0Modifier | Constructor and Description |
---|---|
protected |
InternalFutureFailureAccess()
Constructor for use by subclasses.
|
Modifier and Type | Method and Description |
---|---|
protected abstract Throwable |
tryInternalFastPathGetFailure()
Usually returns
null but, if this Future has failed, may optionally
return the cause of the failure. |
protected InternalFutureFailureAccess()
protected abstract Throwable tryInternalFastPathGetFailure()
null
but, if this Future
has failed, may optionally
return the cause of the failure. "Failure" means specifically "completed with an exception"; it
does not include "was cancelled." To be explicit: If this method returns a non-null value,
then:
isDone()
must return true
isCancelled()
must return false
get()
must not block, and it must throw an ExecutionException
with the
return value of this method as its cause
This method is protected
so that classes like com.google.common.util.concurrent.SettableFuture
do not expose it to their users as an
instance method. In the unlikely event that you need to call this method, call InternalFutures.tryInternalFastPathGetFailure(InternalFutureFailureAccess)
.
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