Mercurial > hg > blitz_condensed
annotate src/com/go/trove/log/LogScribe.java @ 34:6f68e94c1fb8 default tip
Add CondensedStats monitoring utility, equivalent to vmstat
author | Dominic Cleal <dominic-cleal@cdo2.com> |
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date | Thu, 05 Aug 2010 11:07:25 +0100 |
parents | 3dc0c5604566 |
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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.io.*; |
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56 import java.text.*; |
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57 import java.util.TimeZone; |
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58 import com.go.trove.util.FastDateFormat; |
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59 |
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60 /****************************************************************************** |
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61 * LogScribe is a LogListener that writes log messages to a PrintWriter. Each |
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62 * message is printed to a line that is prepended with other LogEvent |
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63 * information. The default prepend format is as follows: |
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64 * |
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65 * <pre> |
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66 * [event type code],[date & time],[thread name],[log source name]>[one space] |
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67 * </pre> |
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68 * |
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69 * The event type codes are <tt>" D", " I", "*W" and "*E"</tt> for debug, |
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70 * info, warn and error, respectively. The default date format looks like |
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71 * this: <tt>"1999/06/08 18:08:34.067 PDT"</tt>. If there is no log source, or |
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72 * it has no name, it is omitted from the prepend. Here is a sample line that |
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73 * is written out: |
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74 * |
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75 * <pre> |
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76 * I,1999/06/08 18:08:34.67 PDT,main> Started Transaction Manager |
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77 * </pre> |
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78 * |
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79 * @author Brian S O'Neill |
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80 * @version |
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81 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 01/07/02 <!-- $--> |
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82 */ |
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83 public class LogScribe implements LogListener { |
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84 private PrintWriter mWriter; |
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85 private DateFormat mSlowFormat; |
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86 private FastDateFormat mFastFormat; |
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87 |
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88 private boolean mShowThread = true; |
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89 private boolean mShowSourceName = true; |
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90 |
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91 public LogScribe(PrintWriter writer) { |
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92 this(writer, (FastDateFormat)null); |
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93 } |
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94 |
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95 public LogScribe(PrintWriter writer, DateFormat format) { |
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96 mWriter = writer; |
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97 mSlowFormat = format; |
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98 if (format == null) { |
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99 mFastFormat = |
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100 FastDateFormat.getInstance("yyyy/MM/dd HH:mm:ss.SSS z"); |
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101 } |
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102 else if (format instanceof SimpleDateFormat) { |
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103 SimpleDateFormat simple = (SimpleDateFormat)format; |
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104 String pattern = simple.toPattern(); |
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105 TimeZone timeZone = simple.getTimeZone(); |
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106 DateFormatSymbols symbols = simple.getDateFormatSymbols(); |
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107 mFastFormat = |
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108 FastDateFormat.getInstance(pattern, timeZone, null, symbols); |
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109 } |
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110 } |
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111 |
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112 public LogScribe(PrintWriter writer, FastDateFormat format) { |
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113 mWriter = writer; |
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114 mSlowFormat = null; |
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115 if (format == null) { |
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116 format = FastDateFormat.getInstance("yyyy/MM/dd HH:mm:ss.SSS z"); |
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117 } |
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118 mFastFormat = format; |
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119 } |
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120 |
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121 public void logMessage(LogEvent e) { |
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122 String message = e.getMessage(); |
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123 if (message != null) { |
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124 synchronized (mWriter) { |
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125 mWriter.print(createPrepend(e)); |
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126 mWriter.println(message); |
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127 mWriter.flush(); |
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128 } |
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129 } |
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130 } |
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131 |
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132 public void logException(LogEvent e) { |
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133 Throwable t = e.getException(); |
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134 |
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135 if (t == null) { |
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136 logMessage(e); |
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137 } |
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138 else { |
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139 synchronized (mWriter) { |
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140 mWriter.print(createPrepend(e)); |
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141 t.printStackTrace(mWriter); |
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142 mWriter.flush(); |
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143 } |
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144 } |
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145 } |
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146 |
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147 /** |
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148 * The showing of the event thread name is on by default. |
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149 */ |
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150 public boolean isShowThreadEnabled() { |
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151 return mShowThread; |
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152 } |
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153 |
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154 public void setShowThreadEnabled(boolean enabled) { |
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155 mShowThread = enabled; |
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156 } |
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157 |
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158 /** |
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159 * The showing of the event source name is on by default. |
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160 */ |
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161 public boolean isShowSourceEnabled() { |
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162 return mShowSourceName; |
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163 } |
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164 |
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165 public void setShowSourceEnabled(boolean enabled) { |
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166 mShowSourceName = enabled; |
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167 } |
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168 |
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169 /** |
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170 * Creates the default line prepend for a message. |
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171 */ |
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172 protected String createPrepend(LogEvent e) { |
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173 StringBuffer pre = new StringBuffer(80); |
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174 |
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175 String code = "??"; |
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176 switch (e.getType()) { |
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177 case LogEvent.DEBUG_TYPE: |
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178 code = " D"; |
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179 break; |
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180 case LogEvent.INFO_TYPE: |
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181 code = " I"; |
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182 break; |
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183 case LogEvent.WARN_TYPE: |
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184 code = "*W"; |
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185 break; |
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186 case LogEvent.ERROR_TYPE: |
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187 code = "*E"; |
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188 break; |
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189 } |
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190 |
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191 pre.append(code); |
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192 pre.append(','); |
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193 if (mFastFormat != null) { |
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194 pre.append(mFastFormat.format(e.getTimestamp())); |
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195 } |
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196 else { |
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197 synchronized (mSlowFormat) { |
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198 pre.append(mSlowFormat.format(e.getTimestamp())); |
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199 } |
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200 } |
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201 |
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202 if (isShowThreadEnabled()) { |
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203 pre.append(','); |
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204 pre.append(e.getThreadName()); |
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205 } |
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206 |
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207 if (isShowSourceEnabled()) { |
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208 Log source = e.getLogSource(); |
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209 if (source != null) { |
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210 String sourceName = source.getName(); |
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211 if (sourceName != null) { |
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212 pre.append(','); |
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213 pre.append(sourceName); |
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214 } |
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215 } |
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216 } |
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217 |
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218 pre.append('>'); |
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219 pre.append(' '); |
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220 |
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221 return pre.toString(); |
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222 } |
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223 } |