PortFileMonitor.java revision 2697:10100ecb0c97
1/* 2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25package com.sun.tools.sjavac.server; 26 27import java.io.IOException; 28import java.util.Timer; 29import java.util.TimerTask; 30 31/** 32 * Monitors the presence of a port file and shuts down the given SjavacServer 33 * whenever the port file is deleted or invalidated. 34 * 35 * TODO: JDK-8046882 36 * 37 * <p><b>This is NOT part of any supported API. 38 * If you write code that depends on this, you do so at your own risk. 39 * This code and its internal interfaces are subject to change or 40 * deletion without notice.</b> 41 */ 42public class PortFileMonitor { 43 44 // Check if the portfile is gone, every 5 seconds. 45 private final static int CHECK_PORTFILE_INTERVAL = 5000; 46 47 final private Timer timer = new Timer(); 48 final private PortFile portFile; 49 final private SjavacServer server; 50 51 public PortFileMonitor(PortFile portFile, 52 SjavacServer server) { 53 this.portFile = portFile; 54 this.server = server; 55 } 56 57 public void start() { 58 TimerTask shutdownCheck = new TimerTask() { 59 public void run() { 60 try { 61 if (!portFile.exists()) { 62 // Time to quit because the portfile was deleted by another 63 // process, probably by the makefile that is done building. 64 server.shutdown("Quitting because portfile was deleted!"); 65 } else if (portFile.markedForStop()) { 66 // Time to quit because another process touched the file 67 // server.port.stop to signal that the server should stop. 68 // This is necessary on some operating systems that lock 69 // the port file hard! 70 server.shutdown("Quitting because a portfile.stop file was found!"); 71 } else if (!portFile.stillMyValues()) { 72 // Time to quit because another build has started. 73 server.shutdown("Quitting because portfile is now owned by another javac server!"); 74 } 75 } catch (IOException e) { 76 e.printStackTrace(server.theLog); 77 server.flushLog(); 78 } catch (InterruptedException e) { 79 Thread.currentThread().interrupt(); 80 e.printStackTrace(server.theLog); 81 server.flushLog(); 82 } 83 } 84 }; 85 86 timer.schedule(shutdownCheck, 0, CHECK_PORTFILE_INTERVAL); 87 } 88 89 public void shutdown() { 90 timer.cancel(); 91 } 92} 93