ActiveMQ example source code file (CustomLogWriter.java)

This example ActiveMQ source code file (CustomLogWriter.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - ActiveMQ tags/keywords

basecommand, connectioninfo, connectioninfo, io, logger, logger, message, messageack, messageack, messagedispatch, object, object, producerid, stringbuilder, wireformatinfo

The ActiveMQ CustomLogWriter.java source code

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.activemq.transport.logwriters;

import java.io.IOException;

import org.apache.activemq.command.BaseCommand;
import org.apache.activemq.command.ConnectionInfo;
import org.apache.activemq.command.Message;
import org.apache.activemq.command.MessageAck;
import org.apache.activemq.command.MessageDispatch;
import org.apache.activemq.command.ProducerAck;
import org.apache.activemq.command.ProducerId;
import org.apache.activemq.command.WireFormatInfo;
import org.apache.activemq.transport.LogWriter;
import org.slf4j.Logger;

/**
 * Custom implementation of LogWriter interface.
 * 
 * @author David Martin Clavo david(dot)martin(dot)clavo(at)gmail.com
 * 
 */
public class CustomLogWriter implements LogWriter {
    
    // doc comment inherited from LogWriter
    public void initialMessage(Logger log) {
        
    }

    // doc comment inherited from LogWriter
    public void logRequest (Logger log, Object command) {
        log.debug("$$ SENDREQ: " + CustomLogWriter.commandToString(command));
    }
    
    // doc comment inherited from LogWriter
    public void logResponse (Logger log, Object response) {
        log.debug("$$ GOT_RESPONSE: "+response);
    }
    
    // doc comment inherited from LogWriter
    public void logAsyncRequest (Logger log, Object command) {
        log.debug("$$ SENDING_ASNYC_REQUEST: "+command);
    }
    
    // doc comment inherited from LogWriter
    public void logOneWay (Logger log, Object command) {
        log.debug("$$ SENDING: " + CustomLogWriter.commandToString(command));
    }
    
    // doc comment inherited from LogWriter
    public void logReceivedCommand (Logger log, Object command) {
        log.debug("$$ RECEIVED: " + CustomLogWriter.commandToString(command));
    }
    
    // doc comment inherited from LogWriter
    public void logReceivedException (Logger log, IOException error) {
        log.debug("$$ RECEIVED_EXCEPTION: "+error, error);
    }
    
    /**
     * Transforms a command into a String
     * @param command An object (hopefully of the BaseCommand class or subclass)
     * to be transformed into String.
     * @return A String which will be written by the CustomLogWriter.
     * If the object is not a BaseCommand, the String 
     * "Unrecognized_object " + command.toString()
     * will be returned.
     */
    private static String commandToString(Object command) {
        StringBuilder sb = new StringBuilder();
        
        if (command instanceof BaseCommand) {

            BaseCommand bc = (BaseCommand)command;
            sb.append(command.getClass().getSimpleName());
            sb.append(' ');
            sb.append(bc.isResponseRequired() ? 'T' : 'F');
            
            
            Message m = null;
            
            if (bc instanceof Message) {
                m = (Message)bc;
            }
            if (bc instanceof MessageDispatch){
                m = ((MessageDispatch)bc).getMessage();   
            }
                
            if (m != null) {
                sb.append(' ');
                sb.append(m.getMessageId());
                sb.append(',');
                sb.append(m.getCommandId());
                ProducerId pid = m.getProducerId();
                long sid = pid.getSessionId();
                sb.append(',');
                sb.append(pid.getConnectionId());
                sb.append(',');
                sb.append(sid);
                sb.append(',');
                sb.append(pid.getValue());
                sb.append(',');
                sb.append(m.getCorrelationId());
                sb.append(',');
                sb.append(m.getType());
            }
            
            if (bc instanceof MessageDispatch){
                sb.append(" toConsumer:");
                sb.append(((MessageDispatch)bc).getConsumerId());
            }
            
            if (bc instanceof ProducerAck) {
                sb.append(" ProducerId:");
                sb.append(((ProducerAck)bc).getProducerId());
            }
            
            if (bc instanceof MessageAck) {
                MessageAck ma = (MessageAck)bc;
                sb.append(" ConsumerID:");
                sb.append(ma.getConsumerId());
                sb.append(" ack:");
                sb.append(ma.getFirstMessageId());
                sb.append('-');
                sb.append(ma.getLastMessageId());
            }
            
            if (bc instanceof ConnectionInfo) {
                ConnectionInfo ci = (ConnectionInfo)bc;
                
                sb.append(' ');
                sb.append(ci.getConnectionId());
            }
            
        } else if (command instanceof WireFormatInfo){
            sb.append("WireFormatInfo");
            
        } else {
            sb.append("Unrecognized_object ");
            sb.append(command.toString());
        }
        
        return sb.toString();
    }

}