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annotate src/org/tmatesoft/hg/internal/Lock.java @ 486:d740edfff563

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Provisional support for Mercurial lock mechanism
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 10 Aug 2012 21:03:03 +0200
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486
d740edfff563 Provisional support for Mercurial lock mechanism
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1 /*
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2 * Copyright (c) 2012 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.internal;
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18
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19 import java.io.File;
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20 import java.io.FileInputStream;
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21 import java.io.FileOutputStream;
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22 import java.io.IOException;
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23 import java.lang.management.ManagementFactory;
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24 import java.net.InetAddress;
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25 import java.nio.ByteBuffer;
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26 import java.nio.channels.FileChannel;
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27
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28 import org.tmatesoft.hg.repo.HgInvalidStateException;
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29
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30 /**
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31 * NOT SAFE FOR MULTITHREAD USE!
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32 *
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33 * Unlike original mechanism, we don't use symlinks, rather files, as it's easier to implement
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34 *
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35 * @author Artem Tikhomirov
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36 * @author TMate Software Ltd.
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37 */
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38 public class Lock {
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39 /*
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40 * Lock .hg/ except .hg/store/ .hg/wlock (HgRepository.repoPathHelper("wlock"))
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41 * Lock .hg/store/ .hg/store/lock (HgRepository.repoPathHelper("store/lock") ???)
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42 */
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43
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44 private final File lockFile;
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45 private int use = 0;
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46 private final int timeoutSeconds;
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47
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48 public Lock(File lock) {
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49 this(lock, 10);
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50 }
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51
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52 public Lock(File lock, int timeoutInSeconds) {
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53 lockFile = lock;
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54 timeoutSeconds = timeoutInSeconds;
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55 }
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56
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57 /**
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58 * Tries to read lock file and supplies hostname:pid (or just pid) information from there
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59 * @return <code>null</code> if no lock file available at the moment
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60 */
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61 public String readLockInfo() {
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62 if (lockFile.exists()) {
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63 try {
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64 byte[] bytes = read(lockFile);
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65 if (bytes != null && bytes.length > 0) {
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66 return new String(bytes);
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67 }
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68 } catch (Exception ex) {
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69 // deliberately ignored
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70 }
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71 }
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72 return null;
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73 }
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74
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75 public boolean isLocked() {
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76 return use > 0;
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77 }
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78
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79 public void acquire() {
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80 if (use > 0) {
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81 use++;
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82 return;
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83 }
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84 StringBuilder lockDescription = new StringBuilder();
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85 lockDescription.append(getHostname());
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86 lockDescription.append(':');
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87 lockDescription.append(getPid());
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88 byte[] bytes = lockDescription.toString().getBytes();
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89 long stopTime = System.currentTimeMillis() + timeoutSeconds*1000;
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90 do {
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91 synchronized(this) {
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92 try {
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93 if (!lockFile.exists()) {
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94 write(lockFile, bytes);
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95 use++;
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96 return;
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97 }
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98 } catch (IOException ex) {
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99 // deliberately ignored
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100 }
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101 try {
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102 wait(1000);
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103 } catch (InterruptedException ex) {
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104 // deliberately ignored
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105 }
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106 }
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107
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108 } while (System.currentTimeMillis() <= stopTime);
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109 String msg = String.format("Failed to aquire lock, waited for %d seconds, present owner: '%s'", timeoutSeconds, readLockInfo());
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110 throw new HgInvalidStateException(msg);
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111 }
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112
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113 public void release() {
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114 if (use == 0) {
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115 throw new HgInvalidStateException("");
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116 }
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117 use--;
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118 if (use > 0) {
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119 return;
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120 }
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121 // do release
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122 lockFile.delete();
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123 }
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124
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125 protected String getHostname() {
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126 try {
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127 return InetAddress.getLocalHost().getHostName();
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128 } catch (Exception ex) {
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129 return "localhost";
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130 }
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131 }
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132
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133 protected int getPid() {
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134 try {
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135 // @see http://blog.igorminar.com/2007/03/how-java-application-can-discover-its.html
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136 if (!Internals.runningOnWindows()) {
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137 File f = new File("/proc/self");
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138 if (f.exists()) {
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139 // /proc/self is a symlink to /proc/pid/ directory
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140 return Integer.parseInt(f.getCanonicalFile().getName());
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141 }
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142 }
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143 String rtBean = ManagementFactory.getRuntimeMXBean().getName();
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144 int x;
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145 if ((x = rtBean.indexOf('@')) != -1) {
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146 return Integer.parseInt(rtBean.substring(0, x));
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147 }
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148 return -1;
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149 } catch (Exception ex) {
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150 return -1;
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151 }
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152 }
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153
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154 private static void write(File f, byte[] content) throws IOException {
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155 FileOutputStream fos = new FileOutputStream(f);
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156 fos.write(content);
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157 fos.close();
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158 }
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159
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160 private static byte[] read(File f) throws IOException {
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161 FileChannel fc = new FileInputStream(f).getChannel();
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162 ByteBuffer bb = ByteBuffer.allocate(Internals.ltoi(fc.size()));
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163 fc.read(bb);
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164 fc.close();
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165 return bb.array();
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166 }
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167 }