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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 java.util.concurrent.Callable;
import org.checkerframework.checker.nullness.qual.Nullable;
/**
* A listening executor service which forwards all its method calls to another listening 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 ForwardingListeningExecutorService}.
*
* @author Isaac Shum
* @since 10.0
*/
@J2ktIncompatible
@GwtIncompatible
@ElementTypesAreNonnullByDefault
public abstract class ForwardingListeningExecutorService extends ForwardingExecutorService
implements ListeningExecutorService {
/** Constructor for use by subclasses. */
protected ForwardingListeningExecutorService() {}
@Override
protected abstract ListeningExecutorService delegate();
@Override
public <T extends @Nullable Object> ListenableFuture<T> submit(Callable<T> task) {
return delegate().submit(task);
}
@Override
public ListenableFuture<?> submit(Runnable task) {
return delegate().submit(task);
}
@Override
public <T extends @Nullable Object> ListenableFuture<T> submit(
Runnable task, @ParametricNullness T result) {
return delegate().submit(task, result);
}
}
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