ActiveMQ example source code file (CreateBrokerCommand.java)

This example ActiveMQ source code file (CreateBrokerCommand.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

exception, exception, file, file, fileoutputstream, hashmap, hashmap, io, ioexception, option, printstream, scanner, string, string, throwable, util

The ActiveMQ CreateBrokerCommand.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.karaf.commands;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintStream;
import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

import org.apache.felix.gogo.commands.Option;
import org.apache.felix.gogo.commands.Command;
import org.apache.karaf.shell.console.OsgiCommandSupport;

/**
 * @version $Rev: 960482 $ $Date: 2010-07-05 10:28:33 +0200 (Mon, 05 Jul 2010) $
 */
 @Command(scope="activemq", name="create-broker", description="Creates a broker instance.")
public class CreateBrokerCommand extends OsgiCommandSupport {
    
    @Option(name = "-n", aliases = {"--name"}, description = "The name of the broker (defaults to localhost).")
    private String name = "localhost";
    @Option(name = "-t", aliases = {"--type"}, description = "type of configuration to be used: spring or blueprint (defaults to spring)")
    private String type = "spring";

    /*
     * (non-Javadoc)
     * @see
     * org.apache.karaf.shell.console.OsgiCommandSupport#doExecute()
     */
    protected Object doExecute() throws Exception {

        try {
            String name = getName();
            File base = new File(System.getProperty("karaf.base"));
            File deploy = new File(base, "deploy");

            HashMap<String, String> props = new HashMap();
            props.put("${name}", name);

            mkdir(deploy);
            File configFile = new File(deploy, name + "-broker.xml");
            
            if (!type.equalsIgnoreCase("spring") && !type.equalsIgnoreCase("blueprint")) {
                System.out.println("@|green Unknown type '" + type + "' Using spring by default");
                type = "spring";
            }
            
            copyFilteredResourceTo(configFile, type.toLowerCase() + ".xml", props);

            System.out.println("");
            System.out.println("Default ActiveMQ Broker (" + name + ") configuration file created at: "
                           + configFile.getPath());
            System.out.println("Please review the configuration and modify to suite your needs.  ");
            System.out.println("");

        } catch (Exception e) {
            e.printStackTrace();
            throw e;
        }

        return 0;
    }

    private void copyFilteredResourceTo(File outFile, String resource, HashMap<String, String> props)
        throws Exception {
        if (!outFile.exists()) {
            System.out.println("Creating file: @|green " + outFile.getPath() + "|");
            InputStream is = CreateBrokerCommand.class.getResourceAsStream(resource);
            try {
                // Read it line at a time so that we can use the platform line
                // ending when we write it out.
                PrintStream out = new PrintStream(new FileOutputStream(outFile));
                try {
                    Scanner scanner = new Scanner(is);
                    while (scanner.hasNextLine()) {
                        String line = scanner.nextLine();
                        line = filter(line, props);
                        out.println(line);
                    }
                } finally {
                    safeClose(out);
                }
            } finally {
                safeClose(is);
            }
        } else {
            System.out.println("@|red File already exists|. Move it out of the way if you want it re-created: "
                           + outFile.getPath() + "");
        }
    }

    private void safeClose(InputStream is) throws IOException {
        if (is == null)
            return;
        try {
            is.close();
        } catch (Throwable ignore) {
        }
    }

    private void safeClose(OutputStream is) throws IOException {
        if (is == null)
            return;
        try {
            is.close();
        } catch (Throwable ignore) {
        }
    }

    private String filter(String line, HashMap<String, String> props) {
        for (Map.Entry<String, String> i : props.entrySet()) {
            int p1;
            while ((p1 = line.indexOf(i.getKey())) >= 0) {
                String l1 = line.substring(0, p1);
                String l2 = line.substring(p1 + i.getKey().length());
                line = l1 + i.getValue() + l2;
            }
        }
        return line;
    }

    private void mkdir(File file) {
        if (!file.exists()) {
            System.out.println("Creating missing directory: @|green " + file.getPath() + "|");
            file.mkdirs();
        }
    }

    public String getName() {
        if (name == null) {
            File base = new File(System.getProperty("karaf.base"));
            name = base.getName();
        }
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

}