Mercurial > hg > blitz_stable

annotate src/com/go/trove/log/IntervalLogStream.java @ 27:511648fa4d64 Version 2.1

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Version to 2.1
author Dan Creswell <dan.creswell@gmail.com>
date Mon, 04 Jan 2010 13:00:40 +0000
parents 3dc0c5604566
children
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1 /* ====================================================================
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2 * Trove - Copyright (c) 1997-2000 Walt Disney Internet Group
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3 * ====================================================================
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4 * The Tea Software License, Version 1.1
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5 *
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6 * Copyright (c) 2000 Walt Disney Internet Group. All rights reserved.
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7 *
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8 * Redistribution and use in source and binary forms, with or without
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9 * modification, are permitted provided that the following conditions
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10 * are met:
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11 *
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12 * 1. Redistributions of source code must retain the above copyright
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13 * notice, this list of conditions and the following disclaimer.
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14 *
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15 * 2. Redistributions in binary form must reproduce the above copyright
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16 * notice, this list of conditions and the following disclaimer in
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17 * the documentation and/or other materials provided with the
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18 * distribution.
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19 *
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20 * 3. The end-user documentation included with the redistribution,
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21 * if any, must include the following acknowledgment:
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22 * "This product includes software developed by the
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23 * Walt Disney Internet Group (http://opensource.go.com/)."
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24 * Alternately, this acknowledgment may appear in the software itself,
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25 * if and wherever such third-party acknowledgments normally appear.
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26 *
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27 * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must
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28 * not be used to endorse or promote products derived from this
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29 * software without prior written permission. For written
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30 * permission, please contact opensource@dig.com.
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31 *
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32 * 5. Products derived from this software may not be called "Tea",
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33 * "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet",
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34 * "Kettle", "Trove" or "BeanDoc" appear in their name, without prior
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35 * written permission of the Walt Disney Internet Group.
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36 *
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37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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40 * DISCLAIMED. IN NO EVENT SHALL THE WALT DISNEY INTERNET GROUP OR ITS
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41 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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42 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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43 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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44 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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45 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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46 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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47 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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48 * ====================================================================
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49 *
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50 * For more information about Tea, please see http://opensource.go.com/.
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51 */
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52
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53 package com.go.trove.log;
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54
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55 import java.lang.ref.WeakReference;
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56 import java.io.*;
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57 import java.util.*;
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58
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59 /******************************************************************************
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60 * IntervalLogStream writes to an underlying OutputStream that is opened once
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61 * per a specific time interval. This class forms the basis of a dated file
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62 * logging mechanism.
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63 *
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64 * @author Brian S O'Neill
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65 * @version
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66 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 9/07/00 <!-- $-->
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67 * @see DailyFileLogStream
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68 */
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69 public abstract class IntervalLogStream extends OutputStream {
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70 private static int cCounter;
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71
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72 private static synchronized String nextName() {
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73 return "IntervalLogStream Auto Rollover " + cCounter++;
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74 }
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75
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76 private Factory mFactory;
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77 private OutputStream mOut;
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78 private boolean mIsClosed;
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79
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80 private Calendar mIntervalStart;
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81 private Calendar mNextIntervalStart;
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82
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83 private Thread mRolloverThread;
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84
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85 public IntervalLogStream(Factory factory) {
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86 mFactory = factory;
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87 }
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88
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89 /**
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90 * Starts up a thread that automatically rolls the underlying OutputStream
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91 * at the beginning of the interval, even if no output is written.
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92 */
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93 public synchronized void startAutoRollover() {
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94 // TODO: If java.util.Timer class is available, use it instead of
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95 // creating a thread each time.
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96 if (mRolloverThread == null) {
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97 mRolloverThread = new Thread(new AutoRollover(this), nextName());
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98 mRolloverThread.setDaemon(true);
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99 mRolloverThread.start();
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100 }
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101 }
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102
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103 /**
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104 * If the auto-rollover thread was started, calling this method will
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105 * stop it.
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106 */
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107 public synchronized void stopAutoRollover() {
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108 if (mRolloverThread != null) {
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109 mRolloverThread.interrupt();
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110 mRolloverThread = null;
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111 }
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112 }
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113
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114 /**
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115 * Moves calendar to beginning of log interval.
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116 */
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117 protected abstract void moveToIntervalStart(Calendar cal);
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118
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119 /**
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120 * Moves calendar to beginning of next log interval.
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121 */
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122 protected abstract void moveToNextIntervalStart(Calendar cal);
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123
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124 public synchronized void write(int b) throws IOException {
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125 getOutputStream().write(b);
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126 }
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127
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128 public synchronized void write(byte[] array) throws IOException {
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129 getOutputStream().write(array, 0, array.length);
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130 }
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131
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132 public synchronized void write(byte[] array, int off, int len)
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133 throws IOException {
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134
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135 getOutputStream().write(array, off, len);
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136 }
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137
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138 public synchronized void flush() throws IOException {
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139 getOutputStream().flush();
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140 }
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141
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142 /**
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143 * Closes any underlying OutputStreams and stops the auto-rollover thread
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144 * if it is running.
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145 */
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146 public synchronized void close() throws IOException {
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147 mIsClosed = true;
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148 stopAutoRollover();
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149
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150 if (mOut != null) {
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151 mOut.close();
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152 }
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153 }
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154
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155 protected synchronized void finalize() throws IOException {
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156 close();
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157 }
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158
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159 private synchronized OutputStream getOutputStream() throws IOException {
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160 if (mIsClosed) {
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161 throw new IOException("LogStream is closed");
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162 }
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163
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164 Calendar cal = Calendar.getInstance();
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165
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166 if (mOut == null ||
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167 cal.before(mIntervalStart) || !cal.before(mNextIntervalStart)) {
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168
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169 if (mOut != null) {
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170 mOut.close();
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171 }
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172
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173 mOut = new BufferedOutputStream
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174 (mFactory.openOutputStream(cal.getTime()));
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175
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176 setIntervalEndpoints(cal);
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177 }
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178
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179 return mOut;
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180 }
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181
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182 private void setIntervalEndpoints(Calendar cal) {
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183 mIntervalStart = (Calendar)cal.clone();
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184 moveToIntervalStart(mIntervalStart);
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185
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186 mNextIntervalStart = cal;
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187 moveToNextIntervalStart(mNextIntervalStart);
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188 }
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189
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190 public static interface Factory {
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191 public OutputStream openOutputStream(Date date) throws IOException;
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192 }
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193
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194 /**
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195 * Thread that just wakes up at the proper time so that log stream
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196 * rolls over even when there is no output.
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197 */
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198 private static class AutoRollover implements Runnable {
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199 // Refer to the log stream via a weak reference so that this thread
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200 // doesn't prevent it from being garbage collected.
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201 private WeakReference mLogStream;
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202
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203 public AutoRollover(IntervalLogStream stream) {
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204 mLogStream = new WeakReference(stream);
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205 }
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206
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207 public void run() {
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208 try {
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209 while (!Thread.interrupted()) {
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210 IntervalLogStream stream =
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211 (IntervalLogStream)mLogStream.get();
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212
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213 if (stream == null || stream.mIsClosed) {
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214 break;
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215 }
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216
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217 try {
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218 // Just requesting the stream forces a rollover.
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219 stream.getOutputStream();
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220 }
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221 catch (IOException e) {
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222 }
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223
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224 Calendar cal = Calendar.getInstance();
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225 stream.moveToNextIntervalStart(cal);
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226
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227 // Clear reference to stream so that it isn't strongly
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228 // reachable from this thread.
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229 stream = null;
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230
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231 long calTime = cal.getTime().getTime();
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232 long timeLeft = calTime - System.currentTimeMillis();
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233
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234 while (timeLeft > 0) {
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235 // Sleep until next start interval. ZZZ...
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236 Thread.sleep(timeLeft);
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237 timeLeft = calTime - System.currentTimeMillis();
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238 }
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239 }
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240 }
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241 catch (InterruptedException e) {
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242 // Exit thread.
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243 }
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244 }
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245 }
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246 }