JmxLiaison.java

/*
 * Copyright 2012 NGDATA nv
 *
 * Licensed 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.lilyproject.util.jmx;

import javax.management.MBeanServerConnection;
import javax.management.ObjectName;
import javax.management.remote.JMXConnector;
import javax.management.remote.JMXConnectorFactory;
import javax.management.remote.JMXServiceURL;
import java.io.IOException;
import java.util.Set;

/**
 * Abstracts between calling JMX methods on the current JVM or another one (of launch-test-lily or launch-hadoop).
 */
public class JmxLiaison {
    private MBeanServerConnection connection;
    private JMXConnector connector;

    public void connect(boolean embed) throws Exception {
        if (embed) {
            connection = java.lang.management.ManagementFactory.getPlatformMBeanServer();
        } else {
            String hostport = "localhost:10102";
            JMXServiceURL url = new JMXServiceURL("service:jmx:rmi://" + hostport + "/jndi/rmi://"
                    + hostport + "/jmxrmi");
            connector = JMXConnectorFactory.connect(url);
            connector.connect();
            connection = connector.getMBeanServerConnection();
        }
    }

    public void disconnect() throws Exception {
        if (connector != null) {
            connector.close();
        }
    }

    public Object getAttribute(ObjectName objectName, String attrName) throws Exception {
        return connection.getAttribute(objectName, attrName);
    }

    public Set<ObjectName> queryNames(ObjectName objectName) throws IOException {
        return connection.queryNames(objectName, null);
    }

    public Object invoke(ObjectName objectName, String operation, Object[] params, String[] signature) throws Exception {
        return connection.invoke(objectName, operation, params, signature);
    }

    public Object invoke(ObjectName objectName, String operation, String arg) throws Exception {
        return connection.invoke(objectName, operation, new Object[] { arg }, new String[] { "java.lang.String" });
    }
}