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.jms;
056:
057: import javax.jms.Message;
058: import javax.jms.Session;
059: import javax.jms.TopicConnection;
060: import javax.jms.TopicPublisher;
061: import javax.jms.TopicSession;
062: import org.apache.log.ErrorHandler;
063: import org.apache.log.LogEvent;
064: import org.apache.log.output.AbstractTarget;
065:
066: /**
067: * A target that writes to a JMS Topic.
068: *
069: * @author <a href="mailto:peter@apache.org">Peter Donald</a>
070: */
071: public abstract class AbstractJMSTarget extends AbstractTarget {
072: ///Appropriate MessageBuilder
073: private MessageBuilder m_builder;
074:
075: public AbstractJMSTarget(final MessageBuilder builder) {
076: m_builder = builder;
077: }
078:
079: public AbstractJMSTarget(final MessageBuilder builder,
080: final ErrorHandler errorHandler) {
081: super (errorHandler);
082: m_builder = builder;
083: }
084:
085: protected abstract void send(Message message);
086:
087: protected abstract Session getSession();
088:
089: /**
090: * Process a log event, via formatting and outputting it.
091: *
092: * @param event the log event
093: */
094: protected void doProcessEvent(final LogEvent event)
095: throws Exception {
096: final Message message = m_builder.buildMessage(getSession(),
097: event);
098: send(message);
099: }
100:
101: /**
102: * Startup log session.
103: *
104: */
105: protected synchronized void open() {
106: if (!isOpen()) {
107: super .open();
108: openConnection();
109: }
110: }
111:
112: /**
113: * Shutdown target.
114: * Attempting to write to target after close() will cause errors to be logged.
115: *
116: */
117: public synchronized void close() {
118: if (isOpen()) {
119: closeConnection();
120: super .close();
121: }
122: }
123:
124: protected abstract void openConnection();
125:
126: protected abstract void closeConnection();
127: }
|