Package io.netty.util.concurrent

Class FailedFuture<V>

java.lang.Object

io.netty.util.concurrent.AbstractFuture<V>

io.netty.util.concurrent.CompleteFuture<V>

io.netty.util.concurrent.FailedFuture<V>

All Implemented Interfaces:

Future<V>, Future<V>

public final class FailedFuture<V>
extends CompleteFuture<V>

The CompleteFuture which is failed already. It is recommended to use EventExecutor.newFailedFuture(Throwable) instead of calling the constructor of this future.

Nested Class Summary

Nested classes/interfaces inherited from interface java.util.concurrent.Future

Future.State

Field Summary

Fields

Modifier and Type	Field	Description
private final Throwable	cause

Constructor Summary

Constructors

Constructor	Description
FailedFuture(EventExecutor executor, Throwable cause)	Creates a new instance.

Method Summary

Modifier and Type	Method	Description
Throwable	cause()	Returns the cause of the failed I/O operation if the I/O operation has failed.
V	getNow()	Return the result without blocking.
boolean	isSuccess()	Returns true if and only if the I/O operation was completed successfully.
Future<V>	sync()	Waits for this future until it is done, and rethrows the cause of the failure if this future failed.
Future<V>	syncUninterruptibly()	Waits for this future until it is done, and rethrows the cause of the failure if this future failed.

Methods inherited from class io.netty.util.concurrent.CompleteFuture

addListener, addListeners, await, await, await, awaitUninterruptibly, awaitUninterruptibly, awaitUninterruptibly, cancel, executor, isCancellable, isCancelled, isDone, removeListener, removeListeners

Methods inherited from class io.netty.util.concurrent.AbstractFuture

get, get

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.util.concurrent.Future

exceptionNow, resultNow, state

Field Details

cause

private final Throwable cause

Constructor Details

FailedFuture

public FailedFuture(EventExecutor executor,
 Throwable cause)

Creates a new instance.

Parameters:

executor - the EventExecutor associated with this future

cause - the cause of failure

Method Details

cause

public Throwable cause()

Description copied from interface: Future

Returns the cause of the failed I/O operation if the I/O operation has failed.

Returns:

the cause of the failure. null if succeeded or this future is not completed yet.

isSuccess

public boolean isSuccess()

Description copied from interface: Future

Returns true if and only if the I/O operation was completed successfully.

sync

public Future<V> sync()

Description copied from interface: Future

Waits for this future until it is done, and rethrows the cause of the failure if this future failed.

Specified by:

sync in interface Future<V>

Overrides:

sync in class CompleteFuture<V>

syncUninterruptibly

public Future<V> syncUninterruptibly()

Description copied from interface: Future

Waits for this future until it is done, and rethrows the cause of the failure if this future failed.

Specified by:

syncUninterruptibly in interface Future<V>

Overrides:

syncUninterruptibly in class CompleteFuture<V>

getNow

public V getNow()

Description copied from interface: Future

Return the result without blocking. If the future is not done yet this will return null.

As it is possible that a null value is used to mark the future as successful you also need to check if the future is really done with Future.isDone() and not rely on the returned null value.