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/*
* Copyright (C) 2011 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.GwtIncompatible;
import com.google.common.annotations.J2ktIncompatible;
import com.google.common.collect.ForwardingObject;
import com.google.errorprone.annotations.CanIgnoreReturnValue;
import com.google.errorprone.annotations.CheckReturnValue;
import java.util.Collection;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import org.checkerframework.checker.nullness.qual.Nullable;
/**
* An executor service which forwards all its method calls to another executor service. Subclasses
* should override one or more methods to modify the behavior of the backing executor service as
* desired per the <a href="http://en.wikipedia.org/wiki/Decorator_pattern">decorator pattern</a>.
*
* <p><b>{@code default} method warning:</b> This class does <i>not</i> forward calls to {@code
* default} methods. Instead, it inherits their default implementations. When those implementations
* invoke methods, they invoke methods on the {@code ForwardingExecutorService}.
*
* @author Kurt Alfred Kluever
* @since 10.0
*/
@J2ktIncompatible
@GwtIncompatible
@ElementTypesAreNonnullByDefault
public abstract class ForwardingExecutorService extends ForwardingObject
implements ExecutorService {
/** Constructor for use by subclasses. */
protected ForwardingExecutorService() {}
@Override
protected abstract ExecutorService delegate();
@CheckReturnValue
@Override
public boolean awaitTermination(long timeout, TimeUnit unit) throws InterruptedException {
return delegate().awaitTermination(timeout, unit);
}
@Override
public <T extends @Nullable Object> List<Future<T>> invokeAll(
Collection<? extends Callable<T>> tasks) throws InterruptedException {
return delegate().invokeAll(tasks);
}
@Override
public <T extends @Nullable Object> List<Future<T>> invokeAll(
Collection<? extends Callable<T>> tasks, long timeout, TimeUnit unit)
throws InterruptedException {
return delegate().invokeAll(tasks, timeout, unit);
}
@Override
public <T extends @Nullable Object> T invokeAny(Collection<? extends Callable<T>> tasks)
throws InterruptedException, ExecutionException {
return delegate().invokeAny(tasks);
}
@Override
public <T extends @Nullable Object> T invokeAny(
Collection<? extends Callable<T>> tasks, long timeout, TimeUnit unit)
throws InterruptedException, ExecutionException, TimeoutException {
return delegate().invokeAny(tasks, timeout, unit);
}
@Override
public boolean isShutdown() {
return delegate().isShutdown();
}
@Override
public boolean isTerminated() {
return delegate().isTerminated();
}
@Override
public void shutdown() {
delegate().shutdown();
}
@Override
@CanIgnoreReturnValue
public List<Runnable> shutdownNow() {
return delegate().shutdownNow();
}
@Override
public void execute(Runnable command) {
delegate().execute(command);
}
@Override
public <T extends @Nullable Object> Future<T> submit(Callable<T> task) {
return delegate().submit(task);
}
@Override
public Future<?> submit(Runnable task) {
return delegate().submit(task);
}
@Override
public <T extends @Nullable Object> Future<T> submit(
Runnable task, @ParametricNullness T result) {
return delegate().submit(task, result);
}
}
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