com.fusesource.forge.jmstest.probe.jmx.JMXProbe.java Source code

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Here is the source code for com.fusesource.forge.jmstest.probe.jmx.JMXProbe.java

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/*
 * Copyright (C) 2009, Progress Software Corporation and/or its
 * subsidiaries or affiliates.  All rights reserved.
 *
 * 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 com.fusesource.forge.jmstest.probe.jmx;

import java.io.IOException;

import javax.management.MBeanServerConnection;
import javax.management.ObjectName;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.fusesource.forge.jmstest.probe.AbstractProbe;

public class JMXProbe extends AbstractProbe {

    private JMXConnectionFactory jmxConnFactory;
    private ObjectName objectName;
    private String attributeName;

    private MBeanServerConnection jmxConnection;
    private Log log = null;

    public JMXProbe() {
        super();
    }

    public JMXProbe(String objectName) {
        super();
        setObjectNameString(objectName);
    }

    public JMXProbe(String name, String objectName) {
        super(name);
        setObjectNameString(objectName);
    }

    @Override
    public Number getValue() throws Exception {
        if (!isActive()) {
            log().warn("JMXProbe " + getName() + " is not accessible...value might not make sense.");
            return 0.0;
        }

        Object attribute = null;
        try {
            attribute = getJMXConnection().getAttribute(getObjectName(), getAttributeName());
        } catch (Exception e) {
            log().error("Error retrieving Attribute for: " + getObjectName().toString() + "[" + getAttributeName()
                    + "]", e);
            throw (e);
        }

        if (attribute instanceof Number) {
            return (Number) attribute;
        } else {
            log.warn("Attribute:" + getObjectName().toString() + "[" + getAttributeName()
                    + "] does not represent a number");
            setActive(false);
            return 0.0;
        }
    }

    public JMXConnectionFactory getJmxConnectionFactory() {
        return jmxConnFactory;
    }

    public void setJmxConnectionFactory(JMXConnectionFactory jmxConnFactory) {
        this.jmxConnFactory = jmxConnFactory;
    }

    public ObjectName getObjectName() {
        return objectName;
    }

    public String getObjectNameString() {
        return objectName.toString();
    }

    public void setObjectNameString(String objectName) {
        try {
            this.objectName = new ObjectName(objectName);
        } catch (Exception e) {
            log().error("Error seting ObjectName for Probe: " + objectName);
            setActive(false);
            lastException = Long.MAX_VALUE;
        }
    }

    public String getAttributeName() {
        return attributeName;
    }

    public void setAttributeName(String attributeName) {
        this.attributeName = attributeName;
    }

    private MBeanServerConnection getJMXConnection() {
        if (jmxConnection == null) {
            try {
                jmxConnection = getJmxConnectionFactory().getConnector().getMBeanServerConnection();
            } catch (IOException ioe) {
                log().error("Error establishing JMX connection.", ioe);
            }
        }
        return jmxConnection;
    }

    private Log log() {
        if (log == null) {
            log = LogFactory.getLog(this.getClass());
        }
        return log;
    }

}