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ActiveMQ example source code file (AbstractJmxCommand.java)

This example ActiveMQ source code file (AbstractJmxCommand.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

class, illegalargumentexception, illegalargumentexception, io, ioexception, jmx, jmx, jmxserviceurl, jmxserviceurl, malformedurlexception, management, method, net, network, object, reflection, string, string, url, util

The ActiveMQ AbstractJmxCommand.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.console.command;

import java.io.File;
import java.io.IOException;
import java.lang.management.ManagementFactory;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;

import javax.management.MBeanServerConnection;
import javax.management.remote.JMXConnector;
import javax.management.remote.JMXConnectorFactory;
import javax.management.remote.JMXServiceURL;

import sun.management.ConnectorAddressLink;

public abstract class AbstractJmxCommand extends AbstractCommand {
    public static final String DEFAULT_JMX_URL    = "service:jmx:rmi:///jndi/rmi://localhost:1099/jmxrmi";

    private JMXServiceURL jmxServiceUrl;
    private String jmxUser;
    private String jmxPassword;
    private boolean jmxUseLocal;
    private JMXConnector jmxConnector;
    private MBeanServerConnection jmxConnection;

    /**
     * Get the current specified JMX service url.
     * @return JMX service url
     */
    protected JMXServiceURL getJmxServiceUrl() {
        return jmxServiceUrl;
    }
    
    public static String getJVM() { 
        return System.getProperty("java.vm.specification.vendor"); 
    } 

    public static boolean isSunJVM() { 
        return getJVM().equals("Sun Microsystems Inc."); 
    }

    /**
     * Get the current JMX service url being used, or create a default one if no JMX service url has been specified.
     * @return JMX service url
     * @throws MalformedURLException
     */
    protected JMXServiceURL useJmxServiceUrl() throws MalformedURLException {
        if (getJmxServiceUrl() == null) {
            String jmxUrl = DEFAULT_JMX_URL;
            int connectingPid = -1;
            if (isSunJVM()) {
                try {
                    // Try to attach to the local process
                    // Classes are all dynamically loaded, since they are specific to Sun VM
                    // if it fails for any reason default jmx url will be used
                	
                	
                    // tools.jar are not always included used by default 
                    // class loader, so we will try to use custom loader that will
                    // try to load tools.jar
                    String javaHome = System.getProperty("java.home");
                    String tools = javaHome + File.separator +
                            ".." + File.separator + "lib" + File.separator + "tools.jar";
                    URLClassLoader loader = new URLClassLoader(new URL[]{new File(tools).toURI().toURL()});
                    
                    // load all classes dynamically so we can compile on non-Sun VMs
                    
                    //MonitoredHost host = MonitoredHost.getMonitoredHost(new HostIdentifier((String)null));
                	Class monitoredHostClass = Class.forName("sun.jvmstat.monitor.MonitoredHost", true, loader);
                	Method getMonitoredHostMethod = monitoredHostClass.getMethod("getMonitoredHost", String.class);
                	Object host = getMonitoredHostMethod.invoke(null, (String)null);
                	//Set vms = host.activeVms();
                	Method activeVmsMethod = host.getClass().getMethod("activeVms", null);
                	Set vms = (Set)activeVmsMethod.invoke(host, null);
                    for (Object vmid: vms) {
                        int pid = ((Integer) vmid).intValue();
                        //MonitoredVm mvm = host.getMonitoredVm(new VmIdentifier(vmid.toString()));
                        Class vmIdentifierClass = Class.forName("sun.jvmstat.monitor.VmIdentifier", true, loader);
                        Constructor vmIdentifierConstructor = vmIdentifierClass.getConstructor(String.class);
                        Object vmIdentifier = vmIdentifierConstructor.newInstance(vmid.toString());
                        Method getMonitoredVmMethod = host.getClass().getMethod("getMonitoredVm", vmIdentifierClass);
                        Object mvm = getMonitoredVmMethod.invoke(host, vmIdentifier);
                        //String name =  MonitoredVmUtil.commandLine(mvm);
                        Class monitoredVmUtilClass = Class.forName("sun.jvmstat.monitor.MonitoredVmUtil", true, loader);
                        Method commandLineMethod = monitoredVmUtilClass.getMethod("commandLine", Class.forName("sun.jvmstat.monitor.MonitoredVm", true, loader));
                        String name = (String)commandLineMethod.invoke(null, mvm);
                        if (name.contains("run.jar start")) {
                        	connectingPid = pid;
                            jmxUrl = ConnectorAddressLink.importFrom(pid);
                            break;
                        }
                    }
                } catch (Exception ignore) {}
            }
            
            if (connectingPid != -1) {
            	context.print("Connecting to pid: " + connectingPid);
            } else {
            	context.print("Connecting to JMX URL: " + jmxUrl);
            }
            setJmxServiceUrl(jmxUrl);
        }

        return getJmxServiceUrl();
    }

    /**
     * Sets the JMX service url to use.
     * @param jmxServiceUrl - new JMX service url to use
     */
    protected void setJmxServiceUrl(JMXServiceURL jmxServiceUrl) {
        this.jmxServiceUrl = jmxServiceUrl;
    }

    /**
     * Sets the JMX service url to use.
     * @param jmxServiceUrl - new JMX service url to use
     * @throws MalformedURLException
     */
    protected void setJmxServiceUrl(String jmxServiceUrl) throws MalformedURLException {
        setJmxServiceUrl(new JMXServiceURL(jmxServiceUrl));
    }

    /**
     * Get the JMX user name to be used when authenticating.
     * @return the JMX user name
     */
    public String getJmxUser() {
        return jmxUser;
    }

    /**
     * Sets the JMS user name to use
     * @param jmxUser - the jmx 
     */
    public void setJmxUser(String jmxUser) {
        this.jmxUser = jmxUser;
    }

    /**
     * Get the password used when authenticating
     * @return the password used for JMX authentication
     */
    public String getJmxPassword() {
        return jmxPassword;
    }

    /**
     * Sets the password to use when authenticating
     * @param jmxPassword - the password used for JMX authentication
     */
    public void setJmxPassword(String jmxPassword) {
        this.jmxPassword = jmxPassword;
    }

    /**
     * Get whether the default mbean server for this JVM should be used instead of the jmx url
     * @return <code>true if the mbean server from this JVM should be used, false if the jmx url should be used
     */
    public boolean isJmxUseLocal() {
        return jmxUseLocal;
    }

    /**
     * Sets whether the the default mbean server for this JVM should be used instead of the jmx url
     * @param jmxUseLocal - <code>true if the mbean server from this JVM should be used, false if the jmx url should be used
     */
    public void setJmxUseLocal(boolean jmxUseLocal) {
        this.jmxUseLocal = jmxUseLocal;
    }

    /**
     * Create a JMX connector using the current specified JMX service url. If there is an existing connection,
     * it tries to reuse this connection.
     * @return created JMX connector
     * @throws IOException
     */
    private JMXConnector createJmxConnector() throws IOException {
        // Reuse the previous connection
        if (jmxConnector != null) {
            jmxConnector.connect();
            return jmxConnector;
        }

        // Create a new JMX connector
        if (jmxUser != null && jmxPassword != null) {
            Map<String,Object> props = new HashMap();
            props.put(JMXConnector.CREDENTIALS, new String[] { jmxUser, jmxPassword });
            jmxConnector = JMXConnectorFactory.connect(useJmxServiceUrl(), props);
        } else {
            jmxConnector = JMXConnectorFactory.connect(useJmxServiceUrl());
        }
        return jmxConnector;
    }

    /**
     * Close the current JMX connector
     */
    protected void closeJmxConnection() {
        try {
            if (jmxConnector != null) {
                jmxConnector.close();
                jmxConnector = null;
            }
        } catch (IOException e) {
        }
    }

    protected MBeanServerConnection createJmxConnection() throws IOException {
        if (jmxConnection == null) {
            if (isJmxUseLocal()) {
                jmxConnection = ManagementFactory.getPlatformMBeanServer();
            } else {
                jmxConnection = createJmxConnector().getMBeanServerConnection();
            }
        }
        return jmxConnection;
    }

    /**
     * Handle the --jmxurl option.
     * @param token - option token to handle
     * @param tokens - succeeding command arguments
     * @throws Exception
     */
    protected void handleOption(String token, List<String> tokens) throws Exception {
        // Try to handle the options first
        if (token.equals("--jmxurl")) {
            // If no jmx url specified, or next token is a new option
            if (tokens.isEmpty() || ((String)tokens.get(0)).startsWith("-")) {
                context.printException(new IllegalArgumentException("JMX URL not specified."));
            }

            // If jmx url already specified
            if (getJmxServiceUrl() != null) {
                context.printException(new IllegalArgumentException("Multiple JMX URL cannot be specified."));
                tokens.clear();
            }

            String strJmxUrl = (String)tokens.remove(0);
            try {
                this.setJmxServiceUrl(new JMXServiceURL(strJmxUrl));
            } catch (MalformedURLException e) {
                context.printException(e);
                tokens.clear();
            }
        } else if(token.equals("--pid")) {
           if (isSunJVM()) {
               if (tokens.isEmpty() || ((String) tokens.get(0)).startsWith("-")) {
                   context.printException(new IllegalArgumentException("pid not specified"));
                   return;
               }
               int pid = Integer.parseInt(tokens.remove(0));
               context.print("Connecting to pid: " + pid);

               String jmxUrl = ConnectorAddressLink.importFrom(pid);
               // If jmx url already specified
               if (getJmxServiceUrl() != null) {
                   context.printException(new IllegalArgumentException("JMX URL already specified."));
                   tokens.clear();
               }
               try {
                   this.setJmxServiceUrl(new JMXServiceURL(jmxUrl));
               } catch (MalformedURLException e) {
                   context.printException(e);
                   tokens.clear();
               }
           }  else {
              context.printInfo("--pid option is not available for this VM, using default JMX url");
           }
        } else if (token.equals("--jmxuser")) {
            // If no jmx user specified, or next token is a new option
            if (tokens.isEmpty() || ((String)tokens.get(0)).startsWith("-")) {
                context.printException(new IllegalArgumentException("JMX user not specified."));
            }
            this.setJmxUser((String) tokens.remove(0));
        } else if (token.equals("--jmxpassword")) {
            // If no jmx password specified, or next token is a new option
            if (tokens.isEmpty() || ((String)tokens.get(0)).startsWith("-")) {
                context.printException(new IllegalArgumentException("JMX password not specified."));
            }
            this.setJmxPassword((String) tokens.remove(0));
        } else if (token.equals("--jmxlocal")) {
            this.setJmxUseLocal(true);
        } else {
            // Let the super class handle the option
            super.handleOption(token, tokens);
        }
    }

    public void execute(List<String> tokens) throws Exception {
        try {
            super.execute(tokens);
        } finally {
            closeJmxConnection();
        }
    }
}

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