org.springframework.core.task.support.ExecutorServiceAdapter Maven / Gradle / Ivy
/*
* Copyright 2002-2018 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
*
* https://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} for it.
*
* This is primarily for adapting to client components that communicate via the
* {@code java.util.concurrent.ExecutorService} API. It can also be used as
* common ground between a local Spring {@code TaskExecutor} backend and a
* JNDI-located {@code ManagedExecutorService} in a Java EE 7 environment.
*
*
NOTE: This ExecutorService adapter does not support the
* lifecycle methods in the {@code java.util.concurrent.ExecutorService} API
* ("shutdown()" etc), similar to a server-wide {@code ManagedExecutorService}
* in a Java EE 7 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 taskExecutor the target executor to delegate to
*/
public ExecutorServiceAdapter(TaskExecutor taskExecutor) {
Assert.notNull(taskExecutor, "TaskExecutor must not be null");
this.taskExecutor = taskExecutor;
}
@Override
public void execute(Runnable task) {
this.taskExecutor.execute(task);
}
@Override
public void shutdown() {
throw new IllegalStateException(
"Manual shutdown not supported - ExecutorServiceAdapter is dependent on an external lifecycle");
}
@Override
public List shutdownNow() {
throw new IllegalStateException(
"Manual shutdown not supported - ExecutorServiceAdapter is dependent on an external lifecycle");
}
@Override
public boolean awaitTermination(long timeout, TimeUnit unit) throws InterruptedException {
throw new IllegalStateException(
"Manual shutdown not supported - ExecutorServiceAdapter is dependent on an external lifecycle");
}
@Override
public boolean isShutdown() {
return false;
}
@Override
public boolean isTerminated() {
return false;
}
}