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/*
* ConcurrentExecutor.java February 2007
*
* Copyright (C) 2007, Niall Gallagher <niallg@users.sf.net>
*
* 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.simpleframework.common.thread;
import java.util.concurrent.Executor;
/**
* The <code>ConcurrentExecutor</code> object is used to execute tasks
* in a thread pool. This creates a thread pool with an unbounded list
* of outstanding tasks, which ensures that any system requesting
* a task to be executed will not block when handing it over.
*
* @author Niall Gallagher
*/
public class ConcurrentExecutor implements Executor {
/**
* This is the queue used to enqueue the tasks for execution.
*/
private final ExecutorQueue queue;
/**
* Constructor for the <code>ConcurrentExecutor</code> object. This
* is used to create a pool of threads that can be used to execute
* arbitrary <code>Runnable</code> tasks. If the threads are
* busy this will simply enqueue the tasks and return.
*
* @param type this is the type of runnable that this accepts
*/
public ConcurrentExecutor(Class type) {
this(type, 10);
}
/**
* Constructor for the <code>ConcurrentExecutor</code> object. This
* is used to create a pool of threads that can be used to execute
* arbitrary <code>Runnable</code> tasks. If the threads are
* busy this will simply enqueue the tasks and return.
*
* @param type this is the type of runnable that this accepts
* @param size this is the number of threads to use in the pool
*/
public ConcurrentExecutor(Class type, int size) {
this(type, size, size);
}
/**
* Constructor for the <code>ConcurrentExecutor</code> object. This
* is used to create a pool of threads that can be used to execute
* arbitrary <code>Runnable</code> tasks. If the threads are
* busy this will simply enqueue the tasks and return.
*
* @param type this is the type of runnable that this accepts
* @param rest this is the number of threads to use in the pool
* @param active this is the maximum size the pool can grow to
*/
public ConcurrentExecutor(Class type, int rest, int active) {
this.queue = new ExecutorQueue(type, rest, active);
}
/**
* The <code>execute</code> method is used to queue the task for
* execution. If all threads are busy the provided task is queued
* and waits until all current and outstanding tasks are finished.
*
* @param task this is the task to be queued for execution
*/
public void execute(Runnable task) {
queue.execute(task);
}
/**
* This is used to stop the executor by interrupting all running
* tasks and shutting down the threads within the pool. This will
* return once it has been stopped, and no further tasks will be
* accepted by this pool for execution.
*/
public void stop() {
stop(60000);
}
/**
* This is used to stop the executor by interrupting all running
* tasks and shutting down the threads within the pool. This will
* return once it has been stopped, and no further tasks will be
* accepted by this pool for execution.
*
* @param wait the number of milliseconds to wait for it to stop
*/
public void stop(long wait) {
queue.stop(wait);
}
}
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