001/* 002 * (C) Copyright 2006-2008 Nuxeo SA (http://nuxeo.com/) and others. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 * 016 * Contributors: 017 * Nuxeo - initial API and implementation 018 * 019 * $Id$ 020 */ 021 022package org.nuxeo.ecm.platform.importer.log; 023 024import java.util.LinkedList; 025import java.util.concurrent.locks.ReentrantReadWriteLock; 026 027import org.apache.commons.logging.Log; 028 029/** 030 * @author Thierry Delprat 031 */ 032public class BufferredLogger extends BasicLogger { 033 034 protected ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); 035 036 protected static int DEFAULT_LOG_BUFFER_LENGTH = 50; 037 038 protected Integer bufferSize = null; 039 040 protected LinkedList<String> logStack = new LinkedList<String>(); 041 042 public BufferredLogger(Log javaLogger) { 043 super(javaLogger); 044 } 045 046 public BufferredLogger(Log javaLogger, int bufferSize) { 047 super(javaLogger); 048 this.bufferSize = bufferSize; 049 } 050 051 protected int getMaxStackLen() { 052 if (bufferSize == null) { 053 bufferSize = DEFAULT_LOG_BUFFER_LENGTH; 054 } 055 return bufferSize; 056 } 057 058 protected void logInStack(String level, String message) { 059 if (!bufferActive) { 060 return; 061 } 062 lock.writeLock().lock(); 063 try { 064 logStack.add(level + " : " + message); 065 if (logStack.size() > getMaxStackLen()) { 066 logStack.remove(); 067 } 068 } finally { 069 lock.writeLock().unlock(); 070 } 071 } 072 073 @Override 074 public String getLoggerBuffer(String sep) { 075 StringBuffer sb = new StringBuffer(); 076 077 lock.readLock().lock(); 078 try { 079 for (String line : logStack) { 080 sb.append(line); 081 sb.append(sep); 082 } 083 return sb.toString(); 084 } finally { 085 lock.readLock().unlock(); 086 } 087 } 088 089 @Override 090 public void info(String message) { 091 super.info(message); 092 if (bufferActive) { 093 logInStack("INFO", message); 094 } 095 } 096 097 @Override 098 public void warn(String message) { 099 super.warn(message); 100 if (bufferActive) { 101 logInStack("WARN", message); 102 } 103 } 104 105 @Override 106 public void debug(String message) { 107 super.debug(message); 108 if (bufferActive) { 109 logInStack("DEBUG", message); 110 } 111 } 112 113 @Override 114 public void debug(String message, Throwable t) { 115 super.debug(message, t); 116 if (bufferActive) { 117 logInStack("DEBUG", message); 118 logInStack("=>ERR", t.getClass().getSimpleName() + ":" + t.getMessage()); 119 } 120 } 121 122 @Override 123 public void error(String message) { 124 super.error(message); 125 if (bufferActive) { 126 logInStack("ERROR", message); 127 } 128 } 129 130 @Override 131 public void error(String message, Throwable t) { 132 super.error(message, t); 133 if (bufferActive) { 134 logInStack("ERROR", message); 135 logInStack("=>ERR", t.getClass().getSimpleName() + ":" + t.getMessage()); 136 } 137 } 138 139}