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Java client for Arcus memcached

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/*
 * arcus-java-client : Arcus Java client
 * Copyright 2010-2014 NAVER Corp.
 *
 * 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 net.spy.memcached;

import java.lang.management.ManagementFactory;

import javax.management.MBeanServer;
import javax.management.ObjectName;

public final class ArcusMBeanServer {

  private final MBeanServer mbserver;

  private static class SingletonHolder {
    private final static ArcusMBeanServer INSTANCE = new ArcusMBeanServer();
  }

  private ArcusMBeanServer() {
    mbserver = ManagementFactory.getPlatformMBeanServer();
  }

  public static ArcusMBeanServer getInstance() {
    return SingletonHolder.INSTANCE;
  }

  public boolean isRegistered(String name) {
    try {
      return mbserver != null
              && mbserver.isRegistered(new ObjectName(name));
    } catch (Exception e) {
      throw new RuntimeException(e);
    }
  }

  public void registMBean(Object o, String name) {
    if (isRegistered(name)) {
      return;
    }

    if (mbserver != null) {
      try {
        mbserver.registerMBean(o, new ObjectName(name));
      } catch (Exception e) {
        throw new RuntimeException(e);
      }
    }
  }
}