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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* 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.cassandra.utils;
import java.lang.management.ManagementFactory;
import javax.management.MBeanServer;
import javax.management.ObjectName;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* If mx4j-tools is in the classpath call maybeLoad to load the HTTP interface of mx4j.
*
* The default port is 8081. To override that provide e.g. -Dmx4jport=8082
* The default listen address is 0.0.0.0. To override that provide -Dmx4jaddress=127.0.0.1
*/
public class Mx4jTool
{
private static final Logger logger = LoggerFactory.getLogger(Mx4jTool.class);
/**
* Starts a JMX over http interface if and mx4j-tools.jar is in the classpath.
* @return true if successfully loaded.
*/
public static boolean maybeLoad()
{
try
{
logger.trace("Will try to load mx4j now, if it's in the classpath");
MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
ObjectName processorName = new ObjectName("Server:name=XSLTProcessor");
Class httpAdaptorClass = Class.forName("mx4j.tools.adaptor.http.HttpAdaptor");
Object httpAdaptor = httpAdaptorClass.newInstance();
httpAdaptorClass.getMethod("setHost", String.class).invoke(httpAdaptor, getAddress());
httpAdaptorClass.getMethod("setPort", Integer.TYPE).invoke(httpAdaptor, getPort());
ObjectName httpName = new ObjectName("system:name=http");
mbs.registerMBean(httpAdaptor, httpName);
Class xsltProcessorClass = Class.forName("mx4j.tools.adaptor.http.XSLTProcessor");
Object xsltProcessor = xsltProcessorClass.newInstance();
httpAdaptorClass.getMethod("setProcessor", Class.forName("mx4j.tools.adaptor.http.ProcessorMBean")).
invoke(httpAdaptor, xsltProcessor);
mbs.registerMBean(xsltProcessor, processorName);
httpAdaptorClass.getMethod("start").invoke(httpAdaptor);
logger.info("mx4j successfuly loaded");
return true;
}
catch (ClassNotFoundException e)
{
logger.trace("Will not load MX4J, mx4j-tools.jar is not in the classpath");
}
catch(Exception e)
{
logger.warn("Could not start register mbean in JMX", e);
}
return false;
}
private static String getAddress()
{
return System.getProperty("mx4jaddress", FBUtilities.getBroadcastAddress().getHostAddress());
}
private static int getPort()
{
int port = 8081;
String sPort = System.getProperty("mx4jport");
if (sPort != null && !sPort.equals(""))
{
port = Integer.parseInt(sPort);
}
return port;
}
}