content: /**
   * 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 io.jafka.mx;
  
  import java.util.concurrent.atomic.AtomicLong;
  
  import io.jafka.utils.Pool;
  import io.jafka.utils.Utils;
  
  /**
   * @author adyliu (imxylz@gmail.com)
   * @since 1.0
   */
  public class ConsumerTopicStat implements ConsumerTopicStatMBean, IMBeanName {
  
      private static final Pool<String, ConsumerTopicStat> instances = new Pool<String, ConsumerTopicStat>();
  
      private final AtomicLong numCumulatedMessagesPerTopic = new AtomicLong(0);
  
      public long getMessagesPerTopic() {
          return numCumulatedMessagesPerTopic.get();
      }
  
      public void recordMessagesPerTopic(int nMessages) {
          numCumulatedMessagesPerTopic.addAndGet(nMessages);
      }
  
      public String getMbeanName() {
          return mBeanName;
      }
  
      private String mBeanName;
  
      public static ConsumerTopicStat getConsumerTopicStat(String topic) {
          ConsumerTopicStat stat = instances.get(topic);
          if (stat == null) {
              stat = new ConsumerTopicStat();
              stat.mBeanName = "jafka:type=jafka.ConsumerTopicStat." + topic;
              if (instances.putIfNotExists(topic, stat) == null) {
                  Utils.registerMBean(stat);
              } else {
                  stat = instances.get(topic);
              }
          }
          return stat;
      }
  }
  