com.google.common.util.concurrent.SettableFuture Maven / Gradle / Ivy
/*
* Copyright (C) 2009 The Guava Authors
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
* in compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License
* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
* or implied. See the License for the specific language governing permissions and limitations under
* the License.
*/
package com.google.common.util.concurrent;
import com.google.common.annotations.GwtCompatible;
import com.google.errorprone.annotations.CanIgnoreReturnValue;
import org.checkerframework.checker.nullness.qual.Nullable;
/**
* A {@link ListenableFuture} whose result can be set by a {@link #set(Object)}, {@link
* #setException(Throwable)} or {@link #setFuture(ListenableFuture)} call. It can also, like any
* other {@code Future}, be {@linkplain #cancel cancelled}.
*
* {@code SettableFuture} is the recommended {@code ListenableFuture} implementation when your
* task cannot be implemented with {@link ListeningExecutorService}, the various {@link Futures}
* utility methods, or {@link ListenableFutureTask}. Those APIs have less opportunity for developer
* error. If your needs are more complex than {@code SettableFuture} supports, use {@link
* AbstractFuture}, which offers an extensible version of the API.
*
* @author Sven Mawson
* @since 9.0 (in 1.0 as {@code ValueFuture})
*/
@GwtCompatible
@ElementTypesAreNonnullByDefault
public final class SettableFuture
extends AbstractFuture.TrustedFuture {
/**
* Creates a new {@code SettableFuture} that can be completed or cancelled by a later method call.
*/
public static SettableFuture create() {
return new SettableFuture<>();
}
@CanIgnoreReturnValue
@Override
public boolean set(@ParametricNullness V value) {
return super.set(value);
}
@CanIgnoreReturnValue
@Override
public boolean setException(Throwable throwable) {
return super.setException(throwable);
}
@CanIgnoreReturnValue
@Override
public boolean setFuture(ListenableFuture future) {
return super.setFuture(future);
}
private SettableFuture() {}
}