/*
* Copyright 2002-2009 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.List;
import java.util.concurrent.AbstractExecutorService;
import java.util.concurrent.TimeUnit;
import org.springframework.core.task.TaskExecutor;
import org.springframework.util.Assert;
/**
* Adapter that takes a Spring {@link org.springframework.core.task.TaskExecutor})
* and exposes a full <code>java.util.concurrent.ExecutorService</code> for it.
*
* <p>This is primarily for adapting to client components that communicate via the
* <code>java.util.concurrent.ExecutorService</code> API. It can also be used as
* common ground between a local Spring <code>TaskExecutor</code> backend and a
* JNDI-located <code>ManagedExecutorService</code> in a Java EE 6 environment.
*
* <p><b>NOTE:</b> This ExecutorService adapter does <em>not</em> support the
* lifecycle methods in the <code>java.util.concurrent.ExecutorService</code> API
* ("shutdown()" etc), similar to a server-wide <code>ManagedExecutorService</code>
* in a Java EE 6 environment. The lifecycle is always up to the backend pool,
* with this adapter acting as an access-only proxy for that target pool.
*
* @author Juergen Hoeller
* @since 3.0
* @see java.util.concurrent.ExecutorService
*/
public class ExecutorServiceAdapter extends AbstractExecutorService {
private final TaskExecutor taskExecutor;
/**
* Create a new ExecutorServiceAdapter, using the given target executor.
* @param concurrentExecutor the target executor to delegate to
*/
public ExecutorServiceAdapter(TaskExecutor taskExecutor) {
Assert.notNull(taskExecutor, "TaskExecutor must not be null");
this.taskExecutor = taskExecutor;
}
public void execute(Runnable task) {
this.taskExecutor.execute(task);
}
public void shutdown() {
throw new IllegalStateException(
"Manual shutdown not supported - ExecutorServiceAdapter is dependent on an external lifecycle");
}
public List<Runnable> shutdownNow() {
throw new IllegalStateException(
"Manual shutdown not supported - ExecutorServiceAdapter is dependent on an external lifecycle");
}
public boolean awaitTermination(long timeout, TimeUnit unit) throws InterruptedException {
throw new IllegalStateException(
"Manual shutdown not supported - ExecutorServiceAdapter is dependent on an external lifecycle");
}
public boolean isShutdown() {
return false;
}
public boolean isTerminated() {
return false;
}
}
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