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ActiveMQ example source code file (MBeansObjectNameQueryFilter.java)

This example ActiveMQ source code file (MBeansObjectNameQueryFilter.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

io, ioexception, ioexception, iterator, list, list, malformedobjectnameexception, management, mbeanserverconnection, mbeansobjectnamequeryfilter, objectname, query_exp_prefix, queryexp, queryexp, string, string, util

The ActiveMQ MBeansObjectNameQueryFilter.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.filter;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import javax.management.MBeanServerConnection;
import javax.management.MalformedObjectNameException;
import javax.management.ObjectName;
import javax.management.QueryExp;

public class MBeansObjectNameQueryFilter extends AbstractQueryFilter {

    public static final String DEFAULT_JMX_DOMAIN = "org.apache.activemq";
    public static final String QUERY_EXP_PREFIX = "MBeans.QueryExp.";

    private MBeanServerConnection jmxConnection;

    /**
     * Creates an mbeans object name query filter that will query on the given
     * JMX connection
     * 
     * @param jmxConnection - JMX connection to use
     */
    public MBeansObjectNameQueryFilter(MBeanServerConnection jmxConnection) {
        super(null);
        this.jmxConnection = jmxConnection;
    }

    /**
     * Queries the JMX service using a mapping of keys and values to construct
     * the object name
     * 
     * @param queries - mapping of keys and values
     * @return collection of ObjectInstance that matches the query
     * @throws MalformedObjectNameException - if the given string is an invalid
     *                 object name
     * @throws IOException - if there is a problem querying the JMX context
     */
    public List query(List queries) throws MalformedObjectNameException, IOException {
        // Query all mbeans
        if (queries == null || queries.isEmpty()) {
            return queryMBeans(new ObjectName(DEFAULT_JMX_DOMAIN + ":*"), null);
        }

        // Constructs object name query
        String objNameQuery = "";
        String queryExp = "";
        for (Iterator i = queries.iterator(); i.hasNext();) {
            String key = (String)i.next();
            String val = "";
            int pos = key.indexOf("=");
            if (pos >= 0) {
                val = key.substring(pos + 1);
                key = key.substring(0, pos);
            }

            if (val.startsWith(QUERY_EXP_PREFIX)) {
                // do nothing as of the moment
            } else if (!key.equals("") && !val.equals("")) {
                objNameQuery = objNameQuery + key + "=" + val + ",";
            }
        }

        // Append * to object name
        objNameQuery = objNameQuery + "*";

        return queryMBeans(new ObjectName(DEFAULT_JMX_DOMAIN + ":" + objNameQuery), queryExp);
    }

    /**
     * Advance query that enables you to specify both the object name and the
     * query expression to use. Note: Query expression is currently unsupported.
     * 
     * @param objName - object name to use for query
     * @param queryExpStr - query expression string
     * @return set of mbeans that matches the query
     * @throws IOException - if there is a problem querying the JMX context
     */
    protected List queryMBeans(ObjectName objName, String queryExpStr) throws IOException {
        QueryExp queryExp = createQueryExp(queryExpStr);

        // Convert mbeans set to list to make it standard throughout the query
        // filter
        List mbeans = new ArrayList(jmxConnection.queryMBeans(objName, queryExp));

        return mbeans;
    }

    /**
     * Creates a query expression based on the query expression string Note:
     * currently unsupported
     * 
     * @param queryExpStr - query expression string
     * @return the created query expression
     */
    protected QueryExp createQueryExp(String queryExpStr) {
        // Currently unsupported
        return null;
    }
}

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