/*
* Copyright 2002-2013 the original author or 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 org.springframework.core.task.support;
import java.util.concurrent.Callable;
import java.util.concurrent.Executor;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;
import java.util.concurrent.FutureTask;
import java.util.concurrent.RejectedExecutionException;
import org.springframework.core.task.AsyncListenableTaskExecutor;
import org.springframework.core.task.TaskRejectedException;
import org.springframework.util.Assert;
import org.springframework.util.concurrent.ListenableFuture;
import org.springframework.util.concurrent.ListenableFutureTask;
/**
* Adapter that takes a JDK {@code java.util.concurrent.Executor} and
* exposes a Spring {@link org.springframework.core.task.TaskExecutor} for it.
* Also detects an extended {@code java.util.concurrent.ExecutorService}, adapting
* the {@link org.springframework.core.task.AsyncTaskExecutor} interface accordingly.
*
* @author Juergen Hoeller
* @since 3.0
* @see java.util.concurrent.Executor
* @see java.util.concurrent.ExecutorService
* @see java.util.concurrent.Executors
*/
public class TaskExecutorAdapter implements AsyncListenableTaskExecutor {
private final Executor concurrentExecutor;
/**
* Create a new TaskExecutorAdapter,
* using the given JDK concurrent executor.
* @param concurrentExecutor the JDK concurrent executor to delegate to
*/
public TaskExecutorAdapter(Executor concurrentExecutor) {
Assert.notNull(concurrentExecutor, "Executor must not be null");
this.concurrentExecutor = concurrentExecutor;
}
/**
* Delegates to the specified JDK concurrent executor.
* @see java.util.concurrent.Executor#execute(Runnable)
*/
@Override
public void execute(Runnable task) {
try {
this.concurrentExecutor.execute(task);
}
catch (RejectedExecutionException ex) {
throw new TaskRejectedException(
"Executor [" + this.concurrentExecutor + "] did not accept task: " + task, ex);
}
}
@Override
public void execute(Runnable task, long startTimeout) {
execute(task);
}
@Override
public Future<?> submit(Runnable task) {
try {
if (this.concurrentExecutor instanceof ExecutorService) {
return ((ExecutorService) this.concurrentExecutor).submit(task);
}
else {
FutureTask<Object> future = new FutureTask<Object>(task, null);
this.concurrentExecutor.execute(future);
return future;
}
}
catch (RejectedExecutionException ex) {
throw new TaskRejectedException(
"Executor [" + this.concurrentExecutor + "] did not accept task: " + task, ex);
}
}
@Override
public <T> Future<T> submit(Callable<T> task) {
try {
if (this.concurrentExecutor instanceof ExecutorService) {
return ((ExecutorService) this.concurrentExecutor).submit(task);
}
else {
FutureTask<T> future = new FutureTask<T>(task);
this.concurrentExecutor.execute(future);
return future;
}
}
catch (RejectedExecutionException ex) {
throw new TaskRejectedException(
"Executor [" + this.concurrentExecutor + "] did not accept task: " + task, ex);
}
}
@Override
public ListenableFuture<?> submitListenable(Runnable task) {
try {
ListenableFutureTask<Object> future = new ListenableFutureTask<Object>(task, null);
this.concurrentExecutor.execute(future);
return future;
}
catch (RejectedExecutionException ex) {
throw new TaskRejectedException(
"Executor [" + this.concurrentExecutor + "] did not accept task: " + task, ex);
}
}
@Override
public <T> ListenableFuture<T> submitListenable(Callable<T> task) {
try {
ListenableFutureTask<T> future = new ListenableFutureTask<T>(task);
this.concurrentExecutor.execute(future);
return future;
}
catch (RejectedExecutionException ex) {
throw new TaskRejectedException(
"Executor [" + this.concurrentExecutor + "] did not accept task: " + task, ex);
}
}
}