src.jdk.compiler.share.classes.com.sun.tools.sjavac.server.PortFileMonitor Maven / Gradle / Ivy
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/*
* Copyright (c) 2014, 2016, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package com.sun.tools.sjavac.server;
import com.sun.tools.sjavac.Log;
import java.io.IOException;
import java.util.Timer;
import java.util.TimerTask;
/**
* Monitors the presence of a port file and shuts down the given SjavacServer
* whenever the port file is deleted or invalidated.
*
* TODO: JDK-8046882
*
* This is NOT part of any supported API.
* If you write code that depends on this, you do so at your own risk.
* This code and its internal interfaces are subject to change or
* deletion without notice.
*/
public class PortFileMonitor {
// Check if the portfile is gone, every 5 seconds.
private static final int CHECK_PORTFILE_INTERVAL = 5000;
private final Timer timer = new Timer();
private final PortFile portFile;
private final SjavacServer server;
public PortFileMonitor(PortFile portFile,
SjavacServer server) {
this.portFile = portFile;
this.server = server;
}
public void start() {
Log log = Log.get();
TimerTask shutdownCheck = new TimerTask() {
public void run() {
Log.setLogForCurrentThread(log);
Log.debug("Checking port file status...");
try {
if (!portFile.exists()) {
// Time to quit because the portfile was deleted by another
// process, probably by the makefile that is done building.
server.shutdown("Quitting because portfile was deleted!");
} else if (portFile.markedForStop()) {
// Time to quit because another process touched the file
// server.port.stop to signal that the server should stop.
// This is necessary on some operating systems that lock
// the port file hard!
server.shutdown("Quitting because a portfile.stop file was found!");
} else if (!portFile.stillMyValues()) {
// Time to quit because another build has started.
server.shutdown("Quitting because portfile is now owned by another javac server!");
}
} catch (IOException e) {
Log.error("IOException caught in PortFileMonitor.");
Log.debug(e);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
Log.error(e);
}
}
};
timer.schedule(shutdownCheck, 0, CHECK_PORTFILE_INTERVAL);
}
public void shutdown() {
timer.cancel();
}
}