91 lines
3.5 KiB
Java
91 lines
3.5 KiB
Java
/*
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* Copyright (c) 2014, 2022, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package javacserver.server;
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import java.io.IOException;
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import java.util.Timer;
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import java.util.function.Consumer;
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import javacserver.shared.PortFile;
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import javacserver.util.Log;
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import javacserver.util.RunnableTimerTask;
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/**
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* Monitors the presence of a port file and shuts down the server
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* whenever the port file is deleted or invalidated.
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*
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* TODO: JDK-8046882
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*/
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public class PortFileMonitor {
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// Check if the portfile is gone, every 5 seconds.
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private static final int CHECK_PORTFILE_INTERVAL = 5000;
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private final Timer timer = new Timer();
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private final PortFile portFile;
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private final Consumer<String> onShutdown;
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public PortFileMonitor(PortFile portFile,
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Consumer<String> onShutdown) {
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this.portFile = portFile;
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this.onShutdown = onShutdown;
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}
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public void start() {
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Log log = Log.get();
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timer.schedule(new RunnableTimerTask(() -> checkPortFile(log)), 0, CHECK_PORTFILE_INTERVAL);
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}
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private void checkPortFile(Log log) {
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Log.setLogForCurrentThread(log);
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Log.debug("Checking port file status...");
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try {
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if (!portFile.exists()) {
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// Time to quit because the portfile was deleted by another
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// process, probably by the makefile that is done building.
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onShutdown.accept("Quitting because portfile was deleted!");
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} else if (portFile.markedForStop()) {
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// Time to quit because another process touched the file
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// server.port.stop to signal that the server should stop.
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// This is necessary on some operating systems that lock
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// the port file hard!
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onShutdown.accept("Quitting because a portfile.stop file was found!");
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} else if (!portFile.stillMyValues()) {
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// Time to quit because another build has started.
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onShutdown.accept("Quitting because portfile is now owned by another javac server!");
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}
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} catch (IOException e) {
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Log.error("IOException caught in PortFileMonitor.");
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Log.debug(e);
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} catch (InterruptedException e) {
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Thread.currentThread().interrupt();
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Log.error(e);
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}
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}
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public void shutdown() {
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timer.cancel();
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}
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}
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