runtime/org.argeo.slc.support.simple/src/main/java/org/argeo/slc/log4j/SlcExecutionAppender.java

   1 /*
   2  * Copyright (C) 2010 Mathieu Baudier <mbaudier@argeo.org>
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *         http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 package org.argeo.slc.log4j;
  18
  19 import java.util.Date;
  20
  21 import org.apache.log4j.AppenderSkeleton;
  22 import org.apache.log4j.Layout;
  23 import org.apache.log4j.Level;
  24 import org.apache.log4j.Logger;
  25 import org.apache.log4j.PatternLayout;
  26 import org.apache.log4j.spi.LoggingEvent;
  27 import org.argeo.slc.core.execution.ExecutionThread;
  28 import org.argeo.slc.core.execution.ProcessThreadGroup;
  29 import org.argeo.slc.execution.ExecutionStep;
  30 import org.springframework.beans.factory.DisposableBean;
  31 import org.springframework.beans.factory.InitializingBean;
  32
  33 /** Not meant to be used directly in standard log4j config */
  34 public class SlcExecutionAppender extends AppenderSkeleton implements
  35                 InitializingBean, DisposableBean {
  36
  37         private Boolean disabled = false;
  38
  39         private String level = null;
  40
  41         private Level log4jLevel = null;
  42
  43         /** Marker to prevent stack overflow */
  44         private ThreadLocal<Boolean> dispatching = new ThreadLocal<Boolean>() {
  45
  46                 @Override
  47                 protected Boolean initialValue() {
  48                         return false;
  49                 }
  50         };
  51
  52         private Layout layout = null;
  53         private String pattern = "%m - %c%n";
  54         private Boolean onlyExecutionThread = false;
  55
  56         public void afterPropertiesSet() {
  57                 if (layout != null)
  58                         setLayout(layout);
  59                 else
  60                         setLayout(new PatternLayout(pattern));
  61                 Logger.getRootLogger().addAppender(this);
  62         }
  63
  64         @Override
  65         protected void append(LoggingEvent event) {
  66                 if (disabled)
  67                         return;
  68
  69                 if (dispatching.get())
  70                         return;
  71
  72                 if (level != null && !level.trim().equals("")) {
  73                         if (log4jLevel == null || !log4jLevel.toString().equals(level))
  74                                 try {
  75                                         log4jLevel = Level.toLevel(level);
  76                                 } catch (Exception e) {
  77                                         System.err
  78                                                         .println("Log4j level could not be set for level '"
  79                                                                         + level + "', resetting it to null.");
  80                                         e.printStackTrace();
  81                                         level = null;
  82                                 }
  83
  84                         if (log4jLevel != null
  85                                         && !event.getLevel().isGreaterOrEqual(log4jLevel)) {
  86                                 return;
  87                         }
  88                 }
  89
  90                 Thread currentThread = Thread.currentThread();
  91                 if (currentThread.getThreadGroup() instanceof ProcessThreadGroup) {
  92                         if (onlyExecutionThread
  93                                         && !(currentThread instanceof ExecutionThread))
  94                                 return;
  95
  96                         final String type;
  97                         if (event.getLevel().equals(Level.ERROR)
  98                                         || event.getLevel().equals(Level.FATAL))
  99                                 type = ExecutionStep.ERROR;
 100                         else if (event.getLevel().equals(Level.WARN))
 101                                 type = ExecutionStep.WARNING;
 102                         else if (event.getLevel().equals(Level.INFO))
 103                                 type = ExecutionStep.INFO;
 104                         else if (event.getLevel().equals(Level.DEBUG))
 105                                 type = ExecutionStep.DEBUG;
 106                         else if (event.getLevel().equals(Level.TRACE))
 107                                 type = ExecutionStep.TRACE;
 108                         else
 109                                 type = ExecutionStep.INFO;
 110
 111                         ExecutionStep step = new ExecutionStep(new Date(
 112                                         event.getTimeStamp()), type, layout.format(event));
 113
 114                         try {
 115                                 dispatching.set(true);
 116                                 ((ProcessThreadGroup) currentThread.getThreadGroup())
 117                                                 .dispatchAddStep(step);
 118                         } finally {
 119                                 dispatching.set(false);
 120                         }
 121                 }
 122         }
 123
 124         public void destroy() throws Exception {
 125                 Logger.getRootLogger().removeAppender(this);
 126         }
 127
 128         public void close() {
 129         }
 130
 131         public boolean requiresLayout() {
 132                 return false;
 133         }
 134
 135         public void setLayout(Layout layout) {
 136                 this.layout = layout;
 137         }
 138
 139         public void setPattern(String pattern) {
 140                 this.pattern = pattern;
 141         }
 142
 143         public void setOnlyExecutionThread(Boolean onlyExecutionThread) {
 144                 this.onlyExecutionThread = onlyExecutionThread;
 145         }
 146
 147         public void setDisabled(Boolean disabled) {
 148                 this.disabled = disabled;
 149         }
 150
 151         public void setLevel(String level) {
 152                 this.level = level;
 153         }
 154
 155 }