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annotate src/org/eclipse/jetty/util/log/Log.java @ 803:166b16bda630

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remove org.eclipse.jetty.util.preventers
author Franklin Schmidt <fschmidt@gmail.com>
date Wed, 07 Sep 2016 21:21:32 -0600
parents 3428c60d7cfc
children
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1 //
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2 // ========================================================================
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3 // Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
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4 // ------------------------------------------------------------------------
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5 // All rights reserved. This program and the accompanying materials
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6 // are made available under the terms of the Eclipse Public License v1.0
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7 // and Apache License v2.0 which accompanies this distribution.
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8 //
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9 // The Eclipse Public License is available at
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10 // http://www.eclipse.org/legal/epl-v10.html
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11 //
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12 // The Apache License v2.0 is available at
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13 // http://www.opensource.org/licenses/apache2.0.php
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14 //
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15 // You may elect to redistribute this code under either of these licenses.
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16 // ========================================================================
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17 //
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18
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19 package org.eclipse.jetty.util.log;
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20
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21 import java.io.IOException;
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22 import java.io.InputStream;
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23 import java.lang.reflect.Method;
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24 import java.net.URL;
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25 import java.security.AccessController;
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26 import java.security.PrivilegedAction;
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27 import java.util.Collection;
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28 import java.util.Collections;
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29 import java.util.Enumeration;
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30 import java.util.HashMap;
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31 import java.util.Map;
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32 import java.util.Properties;
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33 import java.util.concurrent.ConcurrentHashMap;
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34 import java.util.concurrent.ConcurrentMap;
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35
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36 import org.eclipse.jetty.util.IO;
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37 import org.eclipse.jetty.util.Loader;
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38
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39 /**
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40 * Logging.
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41 * This class provides a static logging interface. If an instance of the
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42 * org.slf4j.Logger class is found on the classpath, the static log methods
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43 * are directed to a slf4j logger for "org.eclipse.log". Otherwise the logs
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44 * are directed to stderr.
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45 * <p>
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46 * The "org.eclipse.jetty.util.log.class" system property can be used
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47 * to select a specific logging implementation.
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48 * <p>
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49 * If the system property org.eclipse.jetty.util.log.IGNORED is set,
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50 * then ignored exceptions are logged in detail.
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51 *
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52 * @see StdErrLog
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53 * @see Slf4jLog
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54 */
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55 public class Log
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56 {
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57 public final static String EXCEPTION= "EXCEPTION ";
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58 public final static String IGNORED= "IGNORED ";
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59
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60 /**
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61 * Logging Configuration Properties
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62 */
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63 protected static Properties __props;
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64 /**
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65 * The {@link Logger} implementation class name
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66 */
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67 public static String __logClass;
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68 /**
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69 * Legacy flag indicating if {@link Log#ignore(Throwable)} methods produce any output in the {@link Logger}s
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70 */
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71 public static boolean __ignored;
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72
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73 /**
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74 * Hold loggers only.
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75 */
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76 private final static ConcurrentMap<String, Logger> __loggers = new ConcurrentHashMap<String, Logger>();
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77
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78
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79 static
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80 {
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81 /* Instantiate a default configuration properties (empty)
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82 */
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83 __props = new Properties();
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84
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85 AccessController.doPrivileged(new PrivilegedAction<Object>()
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86 {
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87 public Object run()
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88 {
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89 /* First see if the jetty-logging.properties object exists in the classpath.
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90 * This is an optional feature used by embedded mode use, and test cases to allow for early
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91 * configuration of the Log class in situations where access to the System.properties are
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92 * either too late or just impossible.
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93 */
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94 URL testProps = Loader.getResource(Log.class,"jetty-logging.properties",true);
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95 if (testProps != null)
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96 {
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97 InputStream in = null;
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98 try
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99 {
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100 in = testProps.openStream();
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101 __props.load(in);
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102 }
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103 catch (IOException e)
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104 {
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105 System.err.println("Unable to load " + testProps);
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106 e.printStackTrace(System.err);
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107 }
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108 finally
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109 {
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110 IO.close(in);
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111 }
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112 }
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113
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114 /* Now load the System.properties as-is into the __props, these values will override
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115 * any key conflicts in __props.
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116 */
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117 @SuppressWarnings("unchecked")
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118 Enumeration<String> systemKeyEnum = (Enumeration<String>)System.getProperties().propertyNames();
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119 while (systemKeyEnum.hasMoreElements())
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120 {
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121 String key = systemKeyEnum.nextElement();
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122 String val = System.getProperty(key);
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123 //protect against application code insertion of non-String values (returned as null)
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124 if (val != null)
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125 __props.setProperty(key,val);
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126 }
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127
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128 /* Now use the configuration properties to configure the Log statics
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129 */
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130 __logClass = __props.getProperty("org.eclipse.jetty.util.log.class","org.eclipse.jetty.util.log.Slf4jLog");
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131 __ignored = Boolean.parseBoolean(__props.getProperty("org.eclipse.jetty.util.log.IGNORED","false"));
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132 return null;
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133 }
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134 });
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135 }
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136
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137 private static Logger LOG;
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138 private static boolean __initialized;
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139
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140 public static boolean initialized()
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141 {
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142 if (LOG != null)
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143 {
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144 return true;
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145 }
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146
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147 synchronized (Log.class)
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148 {
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149 if (__initialized)
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150 {
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151 return LOG != null;
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152 }
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153 __initialized = true;
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154 }
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155
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156 try
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157 {
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158 Class<?> log_class = Loader.loadClass(Log.class, __logClass);
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159 if (LOG == null || !LOG.getClass().equals(log_class))
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160 {
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161 LOG = (Logger)log_class.newInstance();
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162 LOG.debug("Logging to {} via {}", LOG, log_class.getName());
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163 }
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164 }
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165 catch(Throwable e)
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166 {
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167 // Unable to load specified Logger implementation, default to standard logging.
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168 initStandardLogging(e);
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169 }
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170
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171 return LOG != null;
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172 }
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173
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174 private static void initStandardLogging(Throwable e)
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175 {
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176 Class<?> log_class;
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177 if(e != null && __ignored)
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178 {
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179 e.printStackTrace();
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180 }
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181
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182 if (LOG == null)
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183 {
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184 log_class = StdErrLog.class;
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185 LOG = new StdErrLog();
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186 LOG.debug("Logging to {} via {}", LOG, log_class.getName());
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187 }
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188 }
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189
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190 public static void setLog(Logger log)
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191 {
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192 Log.LOG = log;
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193 }
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194
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195 /**
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196 * @deprecated anonymous logging is deprecated, use a named {@link Logger} obtained from {@link #getLogger(String)}
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197 */
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198 @Deprecated
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199 public static Logger getLog()
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200 {
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201 initialized();
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202 return LOG;
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203 }
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204
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205 /**
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206 * Get the root logger.
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207 * @return the root logger
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208 */
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209 public static Logger getRootLogger() {
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210 initialized();
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211 return LOG;
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212 }
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213
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214 static boolean isIgnored()
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215 {
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216 return __ignored;
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217 }
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218
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219 /**
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220 * Set Log to parent Logger.
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221 * <p>
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222 * If there is a different Log class available from a parent classloader,
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223 * call {@link #getLogger(String)} on it and construct a {@link LoggerLog} instance
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224 * as this Log's Logger, so that logging is delegated to the parent Log.
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225 * <p>
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226 * This should be used if a webapp is using Log, but wishes the logging to be
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227 * directed to the containers log.
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228 * <p>
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229 * If there is not parent Log, then this call is equivalent to<pre>
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230 * Log.setLog(Log.getLogger(name));
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231 * </pre>
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232 * @param name Logger name
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233 */
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234 public static void setLogToParent(String name)
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235 {
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236 ClassLoader loader = Log.class.getClassLoader();
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237 if (loader!=null && loader.getParent()!=null)
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238 {
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239 try
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240 {
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241 Class<?> uberlog = loader.getParent().loadClass("org.eclipse.jetty.util.log.Log");
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242 Method getLogger = uberlog.getMethod("getLogger", new Class[]{String.class});
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243 Object logger = getLogger.invoke(null,name);
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244 setLog(new LoggerLog(logger));
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245 }
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246 catch (Exception e)
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247 {
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248 e.printStackTrace();
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249 }
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250 }
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251 else
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252 {
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253 setLog(getLogger(name));
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254 }
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255 }
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256
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257 /**
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258 * @deprecated anonymous logging is deprecated, use a named {@link Logger} obtained from {@link #getLogger(String)}
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259 */
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260 @Deprecated
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261 public static void debug(Throwable th)
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262 {
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263 if (!isDebugEnabled())
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264 return;
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265 LOG.debug(EXCEPTION, th);
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266 }
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267
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268 /**
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269 * @deprecated anonymous logging is deprecated, use a named {@link Logger} obtained from {@link #getLogger(String)}
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270 */
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271 @Deprecated
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272 public static void debug(String msg)
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273 {
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274 if (!initialized())
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275 return;
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276 LOG.debug(msg);
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277 }
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278
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279 /**
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280 * @deprecated anonymous logging is deprecated, use a named {@link Logger} obtained from {@link #getLogger(String)}
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281 */
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282 @Deprecated
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283 public static void debug(String msg, Object arg)
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284 {
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285 if (!initialized())
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286 return;
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287 LOG.debug(msg, arg);
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288 }
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289
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290 /**
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291 * @deprecated anonymous logging is deprecated, use a named {@link Logger} obtained from {@link #getLogger(String)}
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292 */
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293 @Deprecated
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294 public static void debug(String msg, Object arg0, Object arg1)
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295 {
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296 if (!initialized())
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297 return;
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298 LOG.debug(msg, arg0, arg1);
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299 }
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300
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301 /**
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302 * Ignore an exception unless trace is enabled.
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303 * This works around the problem that log4j does not support the trace level.
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304 * @param thrown the Throwable to ignore
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305 */
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306 /**
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307 * @deprecated anonymous logging is deprecated, use a named {@link Logger} obtained from {@link #getLogger(String)}
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308 */
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309 @Deprecated
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310 public static void ignore(Throwable thrown)
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311 {
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312 if (!initialized())
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313 return;
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314 LOG.ignore(thrown);
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315 }
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316
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317 /**
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318 * @deprecated anonymous logging is deprecated, use a named {@link Logger} obtained from {@link #getLogger(String)}
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319 */
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320 @Deprecated
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321 public static void info(String msg)
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322 {
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323 if (!initialized())
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324 return;
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325 LOG.info(msg);
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326 }
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327
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328 /**
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329 * @deprecated anonymous logging is deprecated, use a named {@link Logger} obtained from {@link #getLogger(String)}
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330 */
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331 @Deprecated
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332 public static void info(String msg, Object arg)
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333 {
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334 if (!initialized())
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335 return;
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336 LOG.info(msg, arg);
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337 }
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338
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339 /**
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340 * @deprecated anonymous logging is deprecated, use a named {@link Logger} obtained from {@link #getLogger(String)}
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341 */
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342 @Deprecated
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343 public static void info(String msg, Object arg0, Object arg1)
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344 {
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345 if (!initialized())
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346 return;
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347 LOG.info(msg, arg0, arg1);
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348 }
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349
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350 /**
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351 * @deprecated anonymous logging is deprecated, use a named {@link Logger} obtained from {@link #getLogger(String)}
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352 */
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353 @Deprecated
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354 public static boolean isDebugEnabled()
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355 {
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356 if (!initialized())
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357 return false;
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358 return LOG.isDebugEnabled();
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359 }
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360
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361 /**
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362 * @deprecated anonymous logging is deprecated, use a named {@link Logger} obtained from {@link #getLogger(String)}
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363 */
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364 @Deprecated
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365 public static void warn(String msg)
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366 {
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367 if (!initialized())
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368 return;
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369 LOG.warn(msg);
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370 }
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371
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372 /**
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373 * @deprecated anonymous logging is deprecated, use a named {@link Logger} obtained from {@link #getLogger(String)}
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374 */
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375 @Deprecated
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376 public static void warn(String msg, Object arg)
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377 {
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378 if (!initialized())
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379 return;
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380 LOG.warn(msg, arg);
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381 }
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382
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383 /**
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384 * @deprecated anonymous logging is deprecated, use a named {@link Logger} obtained from {@link #getLogger(String)}
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385 */
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386 @Deprecated
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387 public static void warn(String msg, Object arg0, Object arg1)
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388 {
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389 if (!initialized())
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390 return;
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391 LOG.warn(msg, arg0, arg1);
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392 }
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393
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394 /**
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395 * @deprecated anonymous logging is deprecated, use a named {@link Logger} obtained from {@link #getLogger(String)}
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396 */
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397 @Deprecated
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398 public static void warn(String msg, Throwable th)
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399 {
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400 if (!initialized())
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401 return;
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402 LOG.warn(msg, th);
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403 }
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404
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405 /**
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406 * @deprecated anonymous logging is deprecated, use a named {@link Logger} obtained from {@link #getLogger(String)}
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407 */
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408 @Deprecated
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409 public static void warn(Throwable th)
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410 {
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411 if (!initialized())
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412 return;
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413 LOG.warn(EXCEPTION, th);
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414 }
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415
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416 /**
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417 * Obtain a named Logger based on the fully qualified class name.
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418 *
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419 * @param clazz
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420 * the class to base the Logger name off of
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421 * @return the Logger with the given name
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422 */
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423 public static Logger getLogger(Class<?> clazz)
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424 {
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425 return getLogger(clazz.getName());
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426 }
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427
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428 /**
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429 * Obtain a named Logger or the default Logger if null is passed.
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430 * @param name the Logger name
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431 * @return the Logger with the given name
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432 */
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433 public static Logger getLogger(String name)
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434 {
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435 if (!initialized())
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436 return null;
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437
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438 if(name==null)
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439 return LOG;
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440
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441 Logger logger = __loggers.get(name);
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442 if(logger==null)
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443 logger = LOG.getLogger(name);
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444
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445 return logger;
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446 }
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447
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448 static ConcurrentMap<String, Logger> getMutableLoggers()
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449 {
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450 return __loggers;
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451 }
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452
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453 /**
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454 * Get a map of all configured {@link Logger} instances.
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455 *
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456 * @return a map of all configured {@link Logger} instances
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457 */
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458 public static Map<String, Logger> getLoggers()
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459 {
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460 return Collections.unmodifiableMap(__loggers);
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461 }
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462 }