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/*******************************************************************************
* Copyright (c) 2007, 2013 Wind River Systems, Inc. and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Wind River Systems - initial API and implementation
*******************************************************************************/
package org.eclipse.tcf;
import java.util.LinkedList;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.jobs.IJobChangeEvent;
import org.eclipse.core.runtime.jobs.IJobChangeListener;
import org.eclipse.core.runtime.jobs.Job;
import org.eclipse.tcf.protocol.IEventQueue;
import org.eclipse.tcf.protocol.Protocol;
/**
* Implementation of Target Communication Framework event queue.
* This implementation is intended for Eclipse environment.
*/
class EventQueue implements IEventQueue, Runnable {
private final LinkedList<Runnable> queue = new LinkedList<Runnable>();
private final Thread thread;
private boolean waiting;
private boolean shutdown;
private int job_cnt;
EventQueue() {
thread = new Thread(this);
thread.setDaemon(true);
thread.setName("TCF Event Dispatcher"); //$NON-NLS-1$
// Need to monitor jobs to detect congestion
Job.getJobManager().addJobChangeListener(new IJobChangeListener() {
public void aboutToRun(IJobChangeEvent event) {
}
public void awake(IJobChangeEvent event) {
}
public void done(IJobChangeEvent event) {
job_cnt--;
}
public void running(IJobChangeEvent event) {
}
public void scheduled(IJobChangeEvent event) {
job_cnt++;
}
public void sleeping(IJobChangeEvent event) {
}
});
}
void start() {
thread.start();
}
void shutdown() {
try {
synchronized (this) {
shutdown = true;
if (waiting) {
waiting = false;
notifyAll();
}
}
thread.join();
}
catch (Throwable e) {
Protocol.log("Failed to shutdown TCF event dispatch thread", e); //$NON-NLS-1$
}
}
public void run() {
for (;;) {
try {
Runnable r = null;
synchronized (this) {
while (queue.size() == 0) {
if (shutdown) return;
waiting = true;
wait();
}
r = queue.removeFirst();
}
r.run();
}
catch (Throwable x) {
Protocol.log("Unhandled exception in TCF event dispatch", x); //$NON-NLS-1$
}
}
}
public synchronized void invokeLater(final Runnable r) {
assert r != null;
if (shutdown) {
// If not in debug mode, silently ignore this case to avoid
// confusion and bad impression to the user.
if (Platform.inDebugMode()) throw new IllegalStateException("TCF event dispatcher has shut down"); //$NON-NLS-1$
return;
}
queue.add(r);
if (waiting) {
waiting = false;
notifyAll();
}
}
public boolean isDispatchThread() {
return Thread.currentThread() == thread;
}
public synchronized int getCongestion() {
if (Job.getJobManager().isIdle()) job_cnt = 0;
int l0 = job_cnt / 10 - 100;
int l1 = queue.size() / 10 - 100;
if (l1 > l0) l0 = l1;
if (l0 > 100) l0 = 100;
return l0;
}
}
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