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    • com.google.common.util.concurrent.WrappingExecutorService Maven / Gradle / Ivy

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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 static com.google.common.base.Preconditions.checkNotNull;
import com.google.common.base.Throwables;
import com.google.common.collect.ImmutableList;
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.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

/**
 *  An abstract {@code ExecutorService} that allows subclasses to
 *  {@linkplain #wrapTask(Callable) wrap} tasks before they are submitted
 *  to the underlying executor.
 *
 *  
    Note that task wrapping may occur even if the task is never executed.
 *
 *  
    For delegation without task-wrapping, see
 *  {@link ForwardingExecutorService}.
 *
 *  @author Chris Nokleberg
 *
 * @deprecated The Google Guava Core Libraries are deprecated and will not be part of the AEM SDK after April 2023
 */
@Deprecated(since = "2022-12-01")
abstract class WrappingExecutorService implements ExecutorService {

    private final ExecutorService delegate;

    protected WrappingExecutorService(ExecutorService delegate) {
        this.delegate = checkNotNull(delegate);
    }

    /**
     * Wraps a task  before it is submitted to the underlying Executor.
     * Though specified in terms of Callable, this method is also applied to
     * Runnable tasks.
     */
    protected abstract  Callable wrapTask(Callable callable);

    /**
     * Wraps a task before it is submitted to the underlying Executor.  This
     * delegates to {@link #wrapTask(Callable)} by default, but should be
     * overridden if there is a better implementation for {@link Runnable
     * runnables}.
     */
    protected Runnable wrapTask(Runnable command) {
        final Callable wrapped = wrapTask(Executors.callable(command, null));
        return new Runnable() {

            @Override
            public void run() {
                try {
                    wrapped.call();
                } catch (Exception e) {
                    Throwables.propagate(e);
                }
            }
        };
    }

    /**
     * Wraps a collection of tasks.
     *
     * @throws NullPointerException if any element of {@code tasks} is null
     */
    private final  ImmutableList> wrapTasks(Collection> tasks) {
        ImmutableList.Builder> builder = ImmutableList.builder();
        for (Callable task : tasks) {
            builder.add(wrapTask(task));
        }
        return builder.build();
    }

    // These methods wrap before delegating.
    @Override
    public final void execute(Runnable command) {
        delegate.execute(wrapTask(command));
    }

    @Override
    public final  Future submit(Callable task) {
        return delegate.submit(wrapTask(checkNotNull(task)));
    }

    @Override
    public final Future submit(Runnable task) {
        return delegate.submit(wrapTask(task));
    }

    @Override
    public final  Future submit(Runnable task, T result) {
        return delegate.submit(wrapTask(task), result);
    }

    @Override
    public final  List> invokeAll(Collection> tasks) throws InterruptedException {
        return delegate.invokeAll(wrapTasks(tasks));
    }

    @Override
    public final  List> invokeAll(Collection> tasks, long timeout, TimeUnit unit) throws InterruptedException {
        return delegate.invokeAll(wrapTasks(tasks), timeout, unit);
    }

    @Override
    public final  T invokeAny(Collection> tasks) throws InterruptedException, ExecutionException {
        return delegate.invokeAny(wrapTasks(tasks));
    }

    @Override
    public final  T invokeAny(Collection> tasks, long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException {
        return delegate.invokeAny(wrapTasks(tasks), timeout, unit);
    }

    // The remaining methods just delegate.
    @Override
    public final void shutdown() {
        delegate.shutdown();
    }

    @Override
    public final List shutdownNow() {
        return delegate.shutdownNow();
    }

    @Override
    public final boolean isShutdown() {
        return delegate.isShutdown();
    }

    @Override
    public final boolean isTerminated() {
        return delegate.isTerminated();
    }

    @Override
    public final boolean awaitTermination(long timeout, TimeUnit unit) throws InterruptedException {
        return delegate.awaitTermination(timeout, unit);
    }
}
    
    
    
    

    




    
    
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