content: /**
   * 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.broker.util;
  
  import java.io.IOException;
  
  import org.apache.activemq.broker.BrokerPluginSupport;
  import org.apache.activemq.command.MessageDispatch;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * The TraceBrokerPathPlugin can be used in a network of Brokers. Each Broker
   * that has the plugin configured, will add it's brokerName to the content
   * of a JMS Property. If all Brokers have this property enabled, the path the
   * message actually took through the network can be seen in the defined property.
   *
   * @org.apache.xbean.XBean element="traceBrokerPathPlugin"
   *
   */
  @SuppressWarnings("unchecked")
  public class TraceBrokerPathPlugin extends BrokerPluginSupport {
  
      private String stampProperty = "BrokerPath";
      private static final Logger LOG = LoggerFactory.getLogger(TraceBrokerPathPlugin.class);
  
      public String getStampProperty() {
          return stampProperty;
      }
  
      public void setStampProperty(String stampProperty) {
          if (stampProperty != null && !stampProperty.isEmpty()) {
              this.stampProperty = stampProperty;
          }
      }
  
      public void preProcessDispatch(MessageDispatch messageDispatch) {
          try {
              if (messageDispatch != null && messageDispatch.getMessage() != null) {
                  String brokerStamp = (String)messageDispatch.getMessage().getProperty(getStampProperty());
                  if (brokerStamp == null) {
                      brokerStamp = getBrokerName();
                  } else {
                      brokerStamp += "," + getBrokerName();
                  }
                  messageDispatch.getMessage().setProperty(getStampProperty(), brokerStamp);
                  messageDispatch.getMessage().setMarshalledProperties(null);
              }
          } catch (IOException ioe) {
              LOG.warn("Setting broker property failed", ioe);
          }
          super.preProcessDispatch(messageDispatch);
      }
  }
  