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annotate src/org/tmatesoft/hg/repo/HgRepositoryLock.java @ 489:9c0138cda59a

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HgRepositoryLock: some javadoc
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Mon, 13 Aug 2012 19:24:29 +0200
parents 45b3b6ca046f
children 3cd3c3d37432
rev   line source
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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.repo;
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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.internal.Experimental;
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29 import org.tmatesoft.hg.internal.Internals;
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30
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31 /**
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32 * NOT SAFE FOR MULTITHREAD USE!
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33 *
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34 * <p>Usage:
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35 * <pre>
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36 * HgRepositoryLock lock = hgRepo.getWorkingDirLock();
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37 * try {
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38 * // Actually lock the repo
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39 * lock.acquire();
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40 * ///
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41 * // do whatever modifies working directory
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42 * ...
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43 * } finally {
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44 * if (lock.isLocked()) {
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45 * // this check is needed not to release()
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46 * // erroneously in case acquire() failed (e.g. due to timeout)
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47 * lock.release();
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48 * }
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49 *
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50 * </pre>
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51 *
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52 * Unlike original mechanism, we don't use symlinks, rather files, as it's easier to implement
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53 *
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54 * @see http://code.google.com/p/hg4j/issues/detail?id=35
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55 * @author Artem Tikhomirov
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56 * @author TMate Software Ltd.
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57 */
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58 @Experimental(reason="Work in progress")
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59 public class HgRepositoryLock {
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60 /*
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61 * Lock .hg/ except .hg/store/ .hg/wlock (new File(hgRepo.getRepoRoot(),"wlock"))
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62 * Lock .hg/store/ .hg/store/lock (HgRepository.repoPathHelper("lock"))
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63 */
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64
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65 private final File lockFile;
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66 private int use = 0;
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67 private final int timeoutSeconds;
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68
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69 HgRepositoryLock(File lock, int timeoutInSeconds) {
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70 lockFile = lock;
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71 timeoutSeconds = timeoutInSeconds;
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72 }
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73
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74 /**
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75 * Tries to read lock file and supplies hostname:pid (or just pid) information from there
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76 * @return <code>null</code> if no lock file available at the moment
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77 */
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78 public String readLockInfo() {
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79 if (lockFile.exists()) {
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80 try {
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81 byte[] bytes = read(lockFile);
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82 if (bytes != null && bytes.length > 0) {
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83 return new String(bytes);
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84 }
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85 } catch (Exception ex) {
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86 // deliberately ignored
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87 }
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88 }
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89 return null;
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90 }
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91
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92 /**
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93 * @return <code>true</code> if we hold the lock
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94 */
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95 public boolean isLocked() {
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96 return use > 0;
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97 }
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98
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99 /**
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100 * Perform actual locking. Waits for timeout (if specified at construction time)
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101 * before throwing {@link HgInvalidStateException} in case lock is not available
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102 * immediately.
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103 *
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104 * <p>Multiple calls are possible, but corresponding number of {@link #release()}
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105 * calls shall be made.
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106 */
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107 public void acquire() {
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108 if (use > 0) {
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109 use++;
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110 return;
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111 }
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112 StringBuilder lockDescription = new StringBuilder();
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113 lockDescription.append(getHostname());
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114 lockDescription.append(':');
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115 lockDescription.append(getPid());
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116 byte[] bytes = lockDescription.toString().getBytes();
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117 long stopTime = timeoutSeconds < 0 ? -1 : (System.currentTimeMillis() + timeoutSeconds*1000);
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118 do {
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119 synchronized(this) {
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120 try {
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121 if (!lockFile.exists()) {
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122 write(lockFile, bytes);
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123 use++;
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124 return;
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125 }
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126 } catch (IOException ex) {
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127 // deliberately ignored
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128 }
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129 try {
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130 wait(1000);
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131 } catch (InterruptedException ex) {
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132 // deliberately ignored
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133 }
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134 }
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135
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136 } while (stopTime == -1/*no timeout*/ || System.currentTimeMillis() <= stopTime);
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137 String msg = String.format("Failed to aquire lock, waited for %d seconds, present owner: '%s'", timeoutSeconds, readLockInfo());
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138 throw new HgInvalidStateException(msg);
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139 }
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140
489
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141 /**
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142 * Release lock we own
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143 */
486
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144 public void release() {
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145 if (use == 0) {
489
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146 throw new HgInvalidStateException("Lock is not held!");
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147 }
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148 use--;
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149 if (use > 0) {
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150 return;
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151 }
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152 // do release
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153 lockFile.delete();
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154 }
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155
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156 protected String getHostname() {
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157 try {
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158 return InetAddress.getLocalHost().getHostName();
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159 } catch (Exception ex) {
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160 return "localhost";
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161 }
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162 }
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163
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164 protected int getPid() {
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165 try {
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166 // @see http://blog.igorminar.com/2007/03/how-java-application-can-discover-its.html
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167 if (!Internals.runningOnWindows()) {
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168 File f = new File("/proc/self");
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169 if (f.exists()) {
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170 // /proc/self is a symlink to /proc/pid/ directory
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171 return Integer.parseInt(f.getCanonicalFile().getName());
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172 }
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173 }
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174 String rtBean = ManagementFactory.getRuntimeMXBean().getName();
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175 int x;
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176 if ((x = rtBean.indexOf('@')) != -1) {
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177 return Integer.parseInt(rtBean.substring(0, x));
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178 }
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179 return -1;
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180 } catch (Exception ex) {
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181 return -1;
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182 }
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183 }
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184
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185 private static void write(File f, byte[] content) throws IOException {
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186 FileOutputStream fos = new FileOutputStream(f);
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187 fos.write(content);
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188 fos.close();
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189 }
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190
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191 private static byte[] read(File f) throws IOException {
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192 FileChannel fc = new FileInputStream(f).getChannel();
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193 ByteBuffer bb = ByteBuffer.allocate(Internals.ltoi(fc.size()));
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194 fc.read(bb);
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195 fc.close();
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196 return bb.array();
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197 }
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198 }