/*
* Copyright 2010 JBoss, a divison Red Hat, Inc
*
* 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.jboss.errai.bus.server.async.scheduling;
import org.jboss.errai.bus.client.api.ErrorCallback;
import org.jboss.errai.bus.server.async.TimedTask;
public class ThreadWorker implements Runnable {
private final Thread thread;
private final TaskProvider pool;
private final ErrorCallback errorCallback;
private volatile boolean active = false;
public ThreadWorker(TaskProvider pool) {
this.thread = new Thread(this, "ExecutorPoolWorker");
this.thread.setDaemon(true);
this.pool = pool;
this.errorCallback = null;
}
public ThreadWorker(ErrorCallback errorCallback, TaskProvider pool) {
this.thread = new Thread(this);
this.thread.setDaemon(true);
this.errorCallback = errorCallback;
this.pool = pool;
}
public void start() {
// Start sampling the load in the past, to simplify calculations.
active = true;
thread.start();
}
public void requestStop() {
active = false;
thread.interrupt();
}
public boolean isAlive() {
return !thread.isAlive();
}
public void run() {
TimedTask task = null;
while (active) {
try {
while (active) {
if ((task = pool.getNextTask()) == null) {
continue;
}
task.run();
}
}
catch (InterruptedException e) {
if (!active) {
/**
* If the thread has been marked inactive, terminate now. Otherwise continue along
* normally.
*/
return;
}
}
catch (Throwable t) {
if (task != null) {
task.cancel(true);
}
if (errorCallback != null) {
/**
* If the errorCallback is defined for this ThreadWorker, we report the exception we
* just experienced.
*/
errorCallback.error(null, t);
} else {
t.printStackTrace();
}
}
}
}
public Thread.State getThreadState() {
return thread.getState();
}
}