/*
 * Copyright (C) 2013 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.errorprone.annotations.CanIgnoreReturnValue;
import java.util.concurrent.Callable;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;

An abstract ScheduledExecutorService that allows subclasses to wrap tasks before they are submitted to the underlying executor.

Note that task wrapping may occur even if the task is never executed.

Author:Luke Sandberg
/** * An abstract {@code ScheduledExecutorService} that allows subclasses to {@linkplain * #wrapTask(Callable) wrap} tasks before they are submitted to the underlying executor. * * <p>Note that task wrapping may occur even if the task is never executed. * * @author Luke Sandberg */
@CanIgnoreReturnValue // TODO(cpovirk): Consider being more strict. @GwtIncompatible abstract class WrappingScheduledExecutorService extends WrappingExecutorService implements ScheduledExecutorService { final ScheduledExecutorService delegate; protected WrappingScheduledExecutorService(ScheduledExecutorService delegate) { super(delegate); this.delegate = delegate; } @Override public final ScheduledFuture<?> schedule(Runnable command, long delay, TimeUnit unit) { return delegate.schedule(wrapTask(command), delay, unit); } @Override public final <V> ScheduledFuture<V> schedule(Callable<V> task, long delay, TimeUnit unit) { return delegate.schedule(wrapTask(task), delay, unit); } @Override public final ScheduledFuture<?> scheduleAtFixedRate( Runnable command, long initialDelay, long period, TimeUnit unit) { return delegate.scheduleAtFixedRate(wrapTask(command), initialDelay, period, unit); } @Override public final ScheduledFuture<?> scheduleWithFixedDelay( Runnable command, long initialDelay, long delay, TimeUnit unit) { return delegate.scheduleWithFixedDelay(wrapTask(command), initialDelay, delay, unit); } }