ObjectNameBuilder.java

/*
 * 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.openejb.monitoring;

import javax.management.MBeanServer;
import javax.management.MalformedObjectNameException;
import javax.management.ObjectName;
import java.util.LinkedHashMap;
import java.util.Map;

/**
 * @version $Rev$ $Date$
 */
public class ObjectNameBuilder {

    private final Map<String, String> map;
    private String domain;

    public ObjectNameBuilder() {
        this("default");
    }

    public ObjectNameBuilder(final String domain) {
        map = new LinkedHashMap<String, String>();
        this.domain = domain;
    }

    public String getDomain() {
        return domain;
    }

    public void setDomain(final String domain) {
        this.domain = domain;
    }

    public ObjectName build() {

        final StringBuilder sb = new StringBuilder(domain + ":");

        try {
            for (final Map.Entry<String, String> entry : map.entrySet()) {
                String sv = entry.getValue();

                if (null != sv) {
                    sv = sv.replace(':', '_');
                }

                sb.append(entry.getKey()).append("=").append(sv).append(",");
            }
            sb.deleteCharAt(sb.lastIndexOf(","));

            return new ObjectName(sb.toString());
        } catch (final MalformedObjectNameException e) {
            throw new IllegalStateException("Failed to build valid name for: " + sb.toString(), e);
        }
    }

    public ObjectNameBuilder set(final String key, final String value) {
        if (value == null || value.isEmpty()) {
            map.put(key, "<empty>");
        } else {
            map.put(key, value);
        }
        return this;
    }

    public ObjectNameBuilder copy() {
        final ObjectNameBuilder builder = new ObjectNameBuilder();
        builder.domain = this.domain;
        builder.map.putAll(this.map);
        return builder;
    }

    public static ObjectName uniqueName(final String type, final String name, final Object object) {
        final ObjectNameBuilder jmxName = new ObjectNameBuilder("openejb.management");
        jmxName.set("ObjectType", type);
        jmxName.set("DataSource", name);
        ObjectName objectName = jmxName.build();

        final MBeanServer server = LocalMBeanServer.get();
        if (server.isRegistered(objectName)) {
            jmxName.set("DataSource", name + "(" + System.identityHashCode(object) + ")");
            objectName = jmxName.build();
        }
        return objectName;
    }
}