1*cdf0e10cSrcweir /************************************************************************* 2*cdf0e10cSrcweir * 3*cdf0e10cSrcweir * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4*cdf0e10cSrcweir * 5*cdf0e10cSrcweir * Copyright 2000, 2010 Oracle and/or its affiliates. 6*cdf0e10cSrcweir * 7*cdf0e10cSrcweir * OpenOffice.org - a multi-platform office productivity suite 8*cdf0e10cSrcweir * 9*cdf0e10cSrcweir * This file is part of OpenOffice.org. 10*cdf0e10cSrcweir * 11*cdf0e10cSrcweir * OpenOffice.org is free software: you can redistribute it and/or modify 12*cdf0e10cSrcweir * it under the terms of the GNU Lesser General Public License version 3 13*cdf0e10cSrcweir * only, as published by the Free Software Foundation. 14*cdf0e10cSrcweir * 15*cdf0e10cSrcweir * OpenOffice.org is distributed in the hope that it will be useful, 16*cdf0e10cSrcweir * but WITHOUT ANY WARRANTY; without even the implied warranty of 17*cdf0e10cSrcweir * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18*cdf0e10cSrcweir * GNU Lesser General Public License version 3 for more details 19*cdf0e10cSrcweir * (a copy is included in the LICENSE file that accompanied this code). 20*cdf0e10cSrcweir * 21*cdf0e10cSrcweir * You should have received a copy of the GNU Lesser General Public License 22*cdf0e10cSrcweir * version 3 along with OpenOffice.org. If not, see 23*cdf0e10cSrcweir * <http://www.openoffice.org/license.html> 24*cdf0e10cSrcweir * for a copy of the LGPLv3 License. 25*cdf0e10cSrcweir * 26*cdf0e10cSrcweir ************************************************************************/ 27*cdf0e10cSrcweir 28*cdf0e10cSrcweir package convwatch; 29*cdf0e10cSrcweir 30*cdf0e10cSrcweir import java.io.File; 31*cdf0e10cSrcweir import java.io.RandomAccessFile; 32*cdf0e10cSrcweir import helper.OSHelper; 33*cdf0e10cSrcweir 34*cdf0e10cSrcweir public class SimpleFileSemaphore /* extends *//* implements */ 35*cdf0e10cSrcweir { 36*cdf0e10cSrcweir String m_sInternSemaphoreFile; 37*cdf0e10cSrcweir File m_aInternSemaphoreFile; 38*cdf0e10cSrcweir GlobalLogWriter m_aLog; 39*cdf0e10cSrcweir 40*cdf0e10cSrcweir public static void sleep( int _nSeconds) 41*cdf0e10cSrcweir { 42*cdf0e10cSrcweir // wait a second here 43*cdf0e10cSrcweir try 44*cdf0e10cSrcweir { 45*cdf0e10cSrcweir java.lang.Thread.sleep(_nSeconds * 1000); 46*cdf0e10cSrcweir } 47*cdf0e10cSrcweir catch (java.lang.InterruptedException e2) 48*cdf0e10cSrcweir { 49*cdf0e10cSrcweir } 50*cdf0e10cSrcweir } 51*cdf0e10cSrcweir 52*cdf0e10cSrcweir public SimpleFileSemaphore() throws IllegalArgumentException 53*cdf0e10cSrcweir { 54*cdf0e10cSrcweir String sInternFileName; 55*cdf0e10cSrcweir if (OSHelper.isWindows()) 56*cdf0e10cSrcweir { 57*cdf0e10cSrcweir sInternFileName = "C:/Temp/ConvwatchOOoSemaphore.txt"; 58*cdf0e10cSrcweir } 59*cdf0e10cSrcweir else if (OSHelper.isUnix()) 60*cdf0e10cSrcweir { 61*cdf0e10cSrcweir sInternFileName = "/tmp/ConvwatchOOoSemaphore.txt"; 62*cdf0e10cSrcweir } 63*cdf0e10cSrcweir else 64*cdf0e10cSrcweir { 65*cdf0e10cSrcweir m_sInternSemaphoreFile = null; 66*cdf0e10cSrcweir throw new IllegalArgumentException("Unknown System, can't initialise SimpleFileSemaphore"); 67*cdf0e10cSrcweir } 68*cdf0e10cSrcweir 69*cdf0e10cSrcweir m_sInternSemaphoreFile = sInternFileName; 70*cdf0e10cSrcweir m_aInternSemaphoreFile = new File(sInternFileName); 71*cdf0e10cSrcweir } 72*cdf0e10cSrcweir 73*cdf0e10cSrcweir public File getSemaphoreFile() 74*cdf0e10cSrcweir { 75*cdf0e10cSrcweir return m_aInternSemaphoreFile; 76*cdf0e10cSrcweir } 77*cdf0e10cSrcweir // ------------------------------------------------------------------------------ 78*cdf0e10cSrcweir // wait until resource is available 79*cdf0e10cSrcweir public void P(File _aSemaphore) 80*cdf0e10cSrcweir { 81*cdf0e10cSrcweir int nCount = 0; 82*cdf0e10cSrcweir int nCheckLoop = 1; 83*cdf0e10cSrcweir 84*cdf0e10cSrcweir while ( nCheckLoop == 1) 85*cdf0e10cSrcweir { 86*cdf0e10cSrcweir // check if resource is available, if not, wait. 87*cdf0e10cSrcweir if ( _aSemaphore.exists() ) 88*cdf0e10cSrcweir { 89*cdf0e10cSrcweir m_aLog.get().println( "Active wait since " + nCount + "sec.."); 90*cdf0e10cSrcweir nCount ++; 91*cdf0e10cSrcweir sleep( 1 ); 92*cdf0e10cSrcweir } 93*cdf0e10cSrcweir else 94*cdf0e10cSrcweir { 95*cdf0e10cSrcweir sleep( 1 ); 96*cdf0e10cSrcweir if ( _aSemaphore.exists() ) 97*cdf0e10cSrcweir { 98*cdf0e10cSrcweir // ups 99*cdf0e10cSrcweir m_aLog.get().println( "ups..."); 100*cdf0e10cSrcweir } 101*cdf0e10cSrcweir else 102*cdf0e10cSrcweir { 103*cdf0e10cSrcweir nCheckLoop = 0; 104*cdf0e10cSrcweir } 105*cdf0e10cSrcweir } 106*cdf0e10cSrcweir } 107*cdf0e10cSrcweir 108*cdf0e10cSrcweir // block resource by ourself 109*cdf0e10cSrcweir try 110*cdf0e10cSrcweir { 111*cdf0e10cSrcweir RandomAccessFile aWriter = new RandomAccessFile(_aSemaphore, "rw"); 112*cdf0e10cSrcweir aWriter.writeByte((int)1); 113*cdf0e10cSrcweir aWriter.close(); 114*cdf0e10cSrcweir } 115*cdf0e10cSrcweir 116*cdf0e10cSrcweir catch (java.io.FileNotFoundException fne) 117*cdf0e10cSrcweir { 118*cdf0e10cSrcweir m_aLog.get().println( "caught: FileNotFoundException"); 119*cdf0e10cSrcweir } 120*cdf0e10cSrcweir catch(java.io.IOException ie) 121*cdf0e10cSrcweir { 122*cdf0e10cSrcweir m_aLog.get().println( "caught: IOException"); 123*cdf0e10cSrcweir } 124*cdf0e10cSrcweir } 125*cdf0e10cSrcweir 126*cdf0e10cSrcweir // ------------------------------------------------------------------------------ 127*cdf0e10cSrcweir // block a resource 128*cdf0e10cSrcweir public void V(File _aSemaphore) 129*cdf0e10cSrcweir { 130*cdf0e10cSrcweir 131*cdf0e10cSrcweir if ( _aSemaphore.exists() ) 132*cdf0e10cSrcweir { 133*cdf0e10cSrcweir _aSemaphore.delete(); 134*cdf0e10cSrcweir } 135*cdf0e10cSrcweir else 136*cdf0e10cSrcweir { 137*cdf0e10cSrcweir m_aLog.get().println("Could be a problem here? No resource block found."); 138*cdf0e10cSrcweir } 139*cdf0e10cSrcweir } 140*cdf0e10cSrcweir 141*cdf0e10cSrcweir // --------------------------------- Unit test --------------------------------- 142*cdf0e10cSrcweir 143*cdf0e10cSrcweir private static boolean SEMAPHORE_SHOULD_EXIST = true; 144*cdf0e10cSrcweir private static boolean SEMAPHORE_SHOULD_NOT_EXIST = false; 145*cdf0e10cSrcweir 146*cdf0e10cSrcweir private static void assure(boolean _b, String _sText) 147*cdf0e10cSrcweir { 148*cdf0e10cSrcweir System.out.print(_sText); 149*cdf0e10cSrcweir System.out.print(" "); 150*cdf0e10cSrcweir if (_b) 151*cdf0e10cSrcweir { 152*cdf0e10cSrcweir System.out.println("ok"); 153*cdf0e10cSrcweir } 154*cdf0e10cSrcweir else 155*cdf0e10cSrcweir { 156*cdf0e10cSrcweir System.out.println("FAILED"); 157*cdf0e10cSrcweir } 158*cdf0e10cSrcweir } 159*cdf0e10cSrcweir 160*cdf0e10cSrcweir private static void testSemaphoreFile(SimpleFileSemaphore a, boolean _bShouldFileExists) 161*cdf0e10cSrcweir { 162*cdf0e10cSrcweir System.out.println("Check if semaphore file exists."); 163*cdf0e10cSrcweir File aSemaphoreFile = a.getSemaphoreFile(); 164*cdf0e10cSrcweir if (aSemaphoreFile.exists()) 165*cdf0e10cSrcweir { 166*cdf0e10cSrcweir System.out.println("Name is: " + aSemaphoreFile.getAbsolutePath()); 167*cdf0e10cSrcweir assure(_bShouldFileExists == SEMAPHORE_SHOULD_EXIST, "Semaphore should exist!"); 168*cdf0e10cSrcweir } 169*cdf0e10cSrcweir else 170*cdf0e10cSrcweir { 171*cdf0e10cSrcweir assure(_bShouldFileExists == SEMAPHORE_SHOULD_NOT_EXIST, "Semaphore should not exist!"); 172*cdf0e10cSrcweir } 173*cdf0e10cSrcweir } 174*cdf0e10cSrcweir 175*cdf0e10cSrcweir public static void main( String[] argv ) 176*cdf0e10cSrcweir { 177*cdf0e10cSrcweir SimpleFileSemaphore a = new SimpleFileSemaphore(); 178*cdf0e10cSrcweir 179*cdf0e10cSrcweir testSemaphoreFile(a, SEMAPHORE_SHOULD_NOT_EXIST); 180*cdf0e10cSrcweir 181*cdf0e10cSrcweir a.P(a.getSemaphoreFile()); 182*cdf0e10cSrcweir 183*cdf0e10cSrcweir testSemaphoreFile(a, SEMAPHORE_SHOULD_EXIST); 184*cdf0e10cSrcweir 185*cdf0e10cSrcweir a.V(a.getSemaphoreFile()); 186*cdf0e10cSrcweir 187*cdf0e10cSrcweir testSemaphoreFile(a, SEMAPHORE_SHOULD_NOT_EXIST); 188*cdf0e10cSrcweir } 189*cdf0e10cSrcweir } 190