1 /* 2 * Copyright (c) 2014, 2016, 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 */ 25 26 package com.sun.tools.sjavac.server; 27 28 import com.sun.tools.sjavac.Log; 29 30 import java.io.IOException; 31 import java.util.Timer; 32 import java.util.TimerTask; 33 34 /** 35 * Monitors the presence of a port file and shuts down the given SjavacServer 36 * whenever the port file is deleted or invalidated. 37 * 38 * TODO: JDK-8046882 39 * 40 * <p><b>This is NOT part of any supported API. 41 * If you write code that depends on this, you do so at your own risk. 42 * This code and its internal interfaces are subject to change or 43 * deletion without notice.</b> 44 */ 45 public class PortFileMonitor { 46 47 // Check if the portfile is gone, every 5 seconds. 48 private final static int CHECK_PORTFILE_INTERVAL = 5000; 49 50 final private Timer timer = new Timer(); 51 final private PortFile portFile; 52 final private SjavacServer server; 53 PortFileMonitor(PortFile portFile, SjavacServer server)54 public PortFileMonitor(PortFile portFile, 55 SjavacServer server) { 56 this.portFile = portFile; 57 this.server = server; 58 } 59 start()60 public void start() { 61 Log log = Log.get(); 62 TimerTask shutdownCheck = new TimerTask() { 63 public void run() { 64 Log.setLogForCurrentThread(log); 65 Log.debug("Checking port file status..."); 66 try { 67 if (!portFile.exists()) { 68 // Time to quit because the portfile was deleted by another 69 // process, probably by the makefile that is done building. 70 server.shutdown("Quitting because portfile was deleted!"); 71 } else if (portFile.markedForStop()) { 72 // Time to quit because another process touched the file 73 // server.port.stop to signal that the server should stop. 74 // This is necessary on some operating systems that lock 75 // the port file hard! 76 server.shutdown("Quitting because a portfile.stop file was found!"); 77 } else if (!portFile.stillMyValues()) { 78 // Time to quit because another build has started. 79 server.shutdown("Quitting because portfile is now owned by another javac server!"); 80 } 81 } catch (IOException e) { 82 Log.error("IOException caught in PortFileMonitor."); 83 Log.debug(e); 84 } catch (InterruptedException e) { 85 Thread.currentThread().interrupt(); 86 Log.error(e); 87 } 88 } 89 }; 90 91 timer.schedule(shutdownCheck, 0, CHECK_PORTFILE_INTERVAL); 92 } 93 shutdown()94 public void shutdown() { 95 timer.cancel(); 96 } 97 } 98