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/*
* 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.tuscany.service.management.jmx.agent;
import java.io.IOException;
import java.net.MalformedURLException;
import java.util.concurrent.atomic.AtomicBoolean;
import javax.management.MBeanServer;
import javax.management.MBeanServerFactory;
import javax.management.ObjectName;
import javax.management.remote.JMXConnectorServer;
import javax.management.remote.JMXConnectorServerFactory;
import javax.management.remote.JMXServiceURL;
/**
* Abstract super class for all the agents.
* @version $Revison$ $Date$
*
*/
public abstract class AbstractAgent implements Agent {
/** Root domain */
private static final String DOMAIN = "tuscany";
/** MBean server to use. */
private MBeanServer mBeanServer;
/** Start flag. */
private AtomicBoolean started = new AtomicBoolean();
/** RMI connector adaptor. */
private JMXConnectorServer connectorServer;
/**
* Initialies the server.
* @throws ManagementException If unable to start the agent.
*/
protected AbstractAgent() throws ManagementException {
mBeanServer = MBeanServerFactory.createMBeanServer(DOMAIN);
}
/**
* @see org.apache.tuscany.service.management.jmx.agent.Agent#getMBeanServer()
*/
public MBeanServer getMBeanServer() {
return mBeanServer;
}
/**
* @see org.apache.tuscany.service.management.jmx.agent.Agent#register(java.lang.Object, java.lang.String)
*/
public final void register(Object instance, String name) throws ManagementException {
try {
mBeanServer.registerMBean(instance, new ObjectName(name));
} catch (Exception ex) {
throw new ManagementException(ex);
}
}
/**
* @see org.apache.tuscany.service.management.jmx.agent.Agent#start()
*/
public final void start() throws ManagementException {
try {
if(started.get()) {
throw new IllegalArgumentException("Agent already started");
}
preStart();
JMXServiceURL url = getAdaptorUrl();
connectorServer = JMXConnectorServerFactory.newJMXConnectorServer(url, null, mBeanServer);
connectorServer.start();
started.set(true);
} catch (MalformedURLException ex) {
throw new ManagementException(ex);
} catch (IOException ex) {
throw new ManagementException(ex);
}
}
/**
* @see org.apache.tuscany.service.management.jmx.agent.Agent#shutdown()
*/
public final void shutdown() throws ManagementException {
try {
if(!started.get()) {
throw new IllegalArgumentException("Agent not started");
}
connectorServer.stop();
postStop();
started.set(false);
} catch (IOException ex) {
throw new ManagementException(ex);
}
}
/**
* Gets the underlying MBean server.
* @return A reference to the mbean server.
*/
protected MBeanServer getMbeanServer() {
return mBeanServer;
}
/**
* Gets the adaptor URL.
* @return Adaptor URL.
*/
protected abstract JMXServiceURL getAdaptorUrl();
/**
* Any initialiation required for protocol specific agent.
*
*/
protected abstract void preStart();
/**
* Any initialiation required for protocol specific agent.
*
*/
protected abstract void postStop();
}
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