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ActiveMQ example source code file (DestinationDotFileInterceptor.java)

This example ActiveMQ source code file (DestinationDotFileInterceptor.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

activemqdestination, activemqdestination, destinationmap, destinationmapnode, destinationmapnode, exception, id_separator, io, iterator, override, queues, string, string, topics, topics, util

The ActiveMQ DestinationDotFileInterceptor.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.broker.view;

import java.io.PrintWriter;
import java.util.Collection;
import java.util.Iterator;
import org.apache.activemq.broker.Broker;
import org.apache.activemq.broker.ConnectionContext;
import org.apache.activemq.broker.region.Destination;
import org.apache.activemq.command.ActiveMQDestination;
import org.apache.activemq.filter.DestinationMap;
import org.apache.activemq.filter.DestinationMapNode;

/**
 * 
 */
public class DestinationDotFileInterceptor extends DotFileInterceptorSupport {

    protected static final String ID_SEPARATOR = "_";

    public DestinationDotFileInterceptor(Broker next, String file) {
        super(next, file);
    }

    @Override
    public Destination addDestination(ConnectionContext context, ActiveMQDestination destination,boolean create) throws Exception {
        Destination answer = super.addDestination(context, destination,create);
        generateFile();
        return answer;
    }

    @Override
    public void removeDestination(ConnectionContext context, ActiveMQDestination destination, long timeout) throws Exception {
        super.removeDestination(context, destination, timeout);
        generateFile();
    }

    @Override
    protected void generateFile(PrintWriter writer) throws Exception {
        ActiveMQDestination[] destinations = getDestinations();

        // lets split into a tree
        DestinationMap map = new DestinationMap();

        for (int i = 0; i < destinations.length; i++) {
            ActiveMQDestination destination = destinations[i];
            map.put(destination, destination);
        }

        // now lets navigate the tree
        writer.println("digraph \"ActiveMQ Destinations\" {");
        writer.println();
        writer.println("node [style = \"rounded,filled\", fontname=\"Helvetica-Oblique\"];");
        writer.println();
        writer.println("topic_root [fillcolor = deepskyblue, label = \"Topics\" ];");
        writer.println("queue_root [fillcolor = deepskyblue, label = \"Queues\" ];");
        writer.println();

        writer.println("subgraph queues {");
        writer.println("  node [fillcolor=red];     ");
        writer.println("  label = \"Queues\"");
        writer.println();
        printNodeLinks(writer, map.getQueueRootNode(), "queue");
        writer.println("}");
        writer.println();

        writer.println("subgraph temp queues {");
        writer.println("  node [fillcolor=red];     ");
        writer.println("  label = \"TempQueues\"");
        writer.println();
        printNodeLinks(writer, map.getTempQueueRootNode(), "tempqueue");
        writer.println("}");
        writer.println();

        writer.println("subgraph topics {");
        writer.println("  node [fillcolor=green];     ");
        writer.println("  label = \"Topics\"");
        writer.println();
        printNodeLinks(writer, map.getTopicRootNode(), "topic");
        writer.println("}");
        writer.println();

        writer.println("subgraph temp topics {");
        writer.println("  node [fillcolor=green];     ");
        writer.println("  label = \"TempTopics\"");
        writer.println();
        printNodeLinks(writer, map.getTempTopicRootNode(), "temptopic");
        writer.println("}");
        writer.println();

        printNodes(writer, map.getQueueRootNode(), "queue");
        writer.println();

        printNodes(writer, map.getTempQueueRootNode(), "tempqueue");
        writer.println();

        printNodes(writer, map.getTopicRootNode(), "topic");
        writer.println();

        printNodes(writer, map.getTempTopicRootNode(), "temptopic");
        writer.println();

        writer.println("}");
    }

    protected void printNodes(PrintWriter writer, DestinationMapNode node, String prefix) {
        String path = getPath(node);
        writer.print("  ");
        writer.print(prefix);
        writer.print(ID_SEPARATOR);
        writer.print(path);
        String label = path;
        if (prefix.equals("topic")) {
            label = "Topics";
        } else if (prefix.equals("queue")) {
            label = "Queues";
        }
        writer.print("[ label = \"");
        writer.print(label);
        writer.println("\" ];");

        Collection children = node.getChildren();
        for (Iterator iter = children.iterator(); iter.hasNext();) {
            DestinationMapNode child = (DestinationMapNode)iter.next();
            printNodes(writer, child, prefix + ID_SEPARATOR + path);
        }
    }

    protected void printNodeLinks(PrintWriter writer, DestinationMapNode node, String prefix) {
        String path = getPath(node);
        Collection children = node.getChildren();
        for (Iterator iter = children.iterator(); iter.hasNext();) {
            DestinationMapNode child = (DestinationMapNode)iter.next();

            writer.print("  ");
            writer.print(prefix);
            writer.print(ID_SEPARATOR);
            writer.print(path);
            writer.print(" -> ");
            writer.print(prefix);
            writer.print(ID_SEPARATOR);
            writer.print(path);
            writer.print(ID_SEPARATOR);
            writer.print(getPath(child));
            writer.println(";");

            printNodeLinks(writer, child, prefix + ID_SEPARATOR + path);
        }
    }

    protected String getPath(DestinationMapNode node) {
        String path = node.getPath();
        if (path.equals("*")) {
            return "root";
        }
        return path;
    }
}

Other ActiveMQ examples (source code examples)

Here is a short list of links related to this ActiveMQ DestinationDotFileInterceptor.java source code file:

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