/*******************************************************************************
* Copyright (c) 2017 Alex Xu 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:
* Alex Xu - initial API and implementation
*******************************************************************************/
package org.eclipse.php.internal.server.core.builtin;
import java.io.FileNotFoundException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import org.eclipse.wst.server.core.IServer;
/**
* Thread used to ping server to test when it is started.
*/
public class PingThread {
// delay before pinging starts
private static final int PING_DELAY = 2000;
// delay between pings
private static final int PING_INTERVAL = 250;
// maximum number of pings before giving up
private int maxPings;
private boolean stop = false;
private String url;
private IServer server;
private PHPServerBehaviour behaviour;
/**
* Create a new PingThread.
*
* @param server
* @param url
* @param maxPings
* the maximum number of times to try pinging, or -1 to continue
* forever
* @param behaviour
*/
public PingThread(IServer server, String url, int maxPings, PHPServerBehaviour behaviour) {
super();
this.server = server;
this.url = url;
this.maxPings = maxPings;
this.behaviour = behaviour;
Thread t = new Thread("PHP Server Ping Thread") { //$NON-NLS-1$
@Override
public void run() {
ping();
}
};
t.setDaemon(true);
t.start();
}
/**
* Ping the server until it is started. Then set the server state to
* STATE_STARTED.
*/
protected void ping() {
int count = 0;
try {
Thread.sleep(PING_DELAY);
} catch (Exception e) {
// ignore
}
while (!stop) {
try {
if (count == maxPings) {
try {
server.stop(false);
} catch (Exception e) {
Trace.trace(Trace.FINEST, "Ping: could not stop server"); //$NON-NLS-1$
}
stop = true;
break;
}
count++;
Trace.trace(Trace.FINEST, "Ping: pinging " + count); //$NON-NLS-1$
URL pingUrl = new URL(url);
URLConnection conn = pingUrl.openConnection();
((HttpURLConnection) conn).setInstanceFollowRedirects(false);
((HttpURLConnection) conn).getResponseCode();
// ping worked - server is up
if (!stop) {
Trace.trace(Trace.FINEST, "Ping: success"); //$NON-NLS-1$
Thread.sleep(200);
behaviour.setServerStarted();
}
stop = true;
} catch (FileNotFoundException fe) {
try {
Thread.sleep(200);
} catch (Exception e) {
// ignore
}
behaviour.setServerStarted();
stop = true;
} catch (Exception e) {
Trace.trace(Trace.FINEST, "Ping: failed"); //$NON-NLS-1$
// pinging failed
if (!stop) {
try {
Thread.sleep(PING_INTERVAL);
} catch (InterruptedException e2) {
// ignore
}
}
}
}
}
/**
* Tell the pinging to stop.
*/
public void stop() {
Trace.trace(Trace.FINEST, "Ping: stopping"); //$NON-NLS-1$
stop = true;
}
}