Source Code Cross Referenced for AsyncLogTarget.java in  » Development » LogKit » org » apache » log » output » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Development » LogKit » org.apache.log.output 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* ====================================================================
002:         * The Apache Software License, Version 1.1
003:         *
004:         * Copyright (c) 1997-2003 The Apache Software Foundation. All rights
005:         * reserved.
006:         *
007:         * Redistribution and use in source and binary forms, with or without
008:         * modification, are permitted provided that the following conditions
009:         * are met:
010:         *
011:         * 1. Redistributions of source code must retain the above copyright
012:         *    notice, this list of conditions and the following disclaimer.
013:         *
014:         * 2. Redistributions in binary form must reproduce the above copyright
015:         *    notice, this list of conditions and the following disclaimer in
016:         *    the documentation and/or other materials provided with the
017:         *    distribution.
018:         *
019:         * 3. The end-user documentation included with the redistribution,
020:         *    if any, must include the following acknowledgment:
021:         *    "This product includes software developed by the
022:         *    Apache Software Foundation (http://www.apache.org/)."
023:         *    Alternately, this acknowledgment may appear in the software
024:         *    itself, if and wherever such third-party acknowledgments
025:         *    normally appear.
026:         *
027:         * 4. The names "Jakarta", "Avalon", and "Apache Software Foundation"
028:         *    must not be used to endorse or promote products derived from this
029:         *    software without prior written permission. For written
030:         *    permission, please contact apache@apache.org.
031:         *
032:         * 5. Products derived from this software may not be called "Apache",
033:         *    nor may "Apache" appear in their name, without prior written
034:         *    permission of the Apache Software Foundation.
035:         *
036:         * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
037:         * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
038:         * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
039:         * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
040:         * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
041:         * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
042:         * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
043:         * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
044:         * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
045:         * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
046:         * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
047:         * SUCH DAMAGE.
048:         * ====================================================================
049:         *
050:         * This software consists of voluntary contributions made by many
051:         * individuals on behalf of the Apache Software Foundation. For more
052:         * information on the Apache Software Foundation, please see
053:         * <http://www.apache.org/>.
054:         */
055:        package org.apache.log.output;
056:
057:        import java.util.LinkedList;
058:        import org.apache.log.ErrorAware;
059:        import org.apache.log.ErrorHandler;
060:        import org.apache.log.LogEvent;
061:        import org.apache.log.LogTarget;
062:
063:        /**
064:         * An asynchronous LogTarget that sends entries on in another thread.
065:         * It is the responsibility of the user of this class to start
066:         * the thread etc.
067:         *
068:         * <pre>
069:         * LogTarget mySlowTarget = ...;
070:         * AsyncLogTarget asyncTarget = new AsyncLogTarget( mySlowTarget );
071:         * Thread thread = new Thread( asyncTarget );
072:         * thread.setPriority( Thread.MIN_PRIORITY );
073:         * thread.start();
074:         *
075:         * logger.setLogTargets( new LogTarget[] { asyncTarget } );
076:         * </pre>
077:         *
078:         * @author <a href="mailto:dev@avalon.apache.org">Avalon Development Team</a>
079:         * @author <a href="mailto:peter@apache.org">Peter Donald</a>
080:         */
081:        public class AsyncLogTarget extends AbstractTarget implements  Runnable {
082:            private final LinkedList m_list;
083:            private final int m_queueSize;
084:            private final LogTarget m_logTarget;
085:
086:            /**
087:             * Creation of a new async log target.
088:             * @param logTarget the underlying target
089:             */
090:            public AsyncLogTarget(final LogTarget logTarget) {
091:                this (logTarget, 15);
092:            }
093:
094:            /**
095:             * Creation of a new async log target.
096:             * @param logTarget the underlying target
097:             * @param queueSize the queue size
098:             */
099:            public AsyncLogTarget(final LogTarget logTarget, final int queueSize) {
100:                m_logTarget = logTarget;
101:                m_list = new LinkedList();
102:                m_queueSize = queueSize;
103:                open();
104:            }
105:
106:            /**
107:             * Provide component with ErrorHandler.
108:             *
109:             * @param errorHandler the errorHandler
110:             */
111:            public synchronized void setErrorHandler(
112:                    final ErrorHandler errorHandler) {
113:                super .setErrorHandler(errorHandler);
114:
115:                if (m_logTarget instanceof  ErrorAware) {
116:                    ((ErrorAware) m_logTarget).setErrorHandler(errorHandler);
117:                }
118:            }
119:
120:            /**
121:             * Process a log event by adding it to queue.
122:             *
123:             * @param event the log event
124:             */
125:            public void doProcessEvent(final LogEvent event) {
126:                synchronized (m_list) {
127:                    final int size = m_list.size();
128:                    while (m_queueSize <= size) {
129:                        try {
130:                            m_list.wait();
131:                        } catch (final InterruptedException ie) {
132:                            //This really should not occur ...
133:                            //Maybe we should log it though for
134:                            //now lets ignore it
135:                        }
136:                    }
137:
138:                    m_list.addFirst(event);
139:
140:                    if (size == 0) {
141:                        //tell the "server" thread to wake up
142:                        //if it is waiting for a queue to contain some items
143:                        m_list.notify();
144:                    }
145:                }
146:            }
147:
148:            /**
149:             * Thread startup.
150:             */
151:            public void run() {
152:                //set this variable when thread is interupted
153:                //so we know we can shutdown thread soon.
154:                boolean interupted = false;
155:
156:                while (true) {
157:                    LogEvent event = null;
158:
159:                    synchronized (m_list) {
160:                        while (null == event) {
161:                            final int size = m_list.size();
162:
163:                            if (size > 0) {
164:                                event = (LogEvent) m_list.removeLast();
165:
166:                                if (size == m_queueSize) {
167:                                    //tell the "client" thread to wake up
168:                                    //if it is waiting for a queue position to open up
169:                                    m_list.notify();
170:                                }
171:
172:                            } else if (interupted || Thread.interrupted()) {
173:                                //ie there is nothing in queue and thread is interrupted
174:                                //thus we stop thread
175:                                return;
176:                            } else {
177:                                try {
178:                                    m_list.wait();
179:                                } catch (final InterruptedException ie) {
180:                                    //Ignore this and let it be dealt in next loop
181:                                    //Need to set variable as the exception throw cleared status
182:                                    interupted = true;
183:                                }
184:                            }
185:                        }
186:                    }
187:
188:                    try {
189:                        //actually process an event
190:                        m_logTarget.processEvent(event);
191:                    } catch (final Throwable throwable) {
192:                        getErrorHandler().error("Unknown error writing event.",
193:                                throwable, event);
194:                    }
195:                }
196:            }
197:        }
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