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 com.alibaba.jstorm.elasticsearch.bolt;
  
  import java.util.Map;
  
  import org.elasticsearch.client.Client;
  
  import backtype.storm.task.OutputCollector;
  import backtype.storm.task.TopologyContext;
  import backtype.storm.topology.base.BaseRichBolt;
  import backtype.storm.tuple.Tuple;
  
  import com.alibaba.jstorm.elasticsearch.common.EsConfig;
  import com.alibaba.jstorm.elasticsearch.common.StormEsClient;
  import com.google.common.base.Preconditions;
  
  public abstract class EsAbstractBolt extends BaseRichBolt {
  
    private static final long serialVersionUID = 6213594268206022374L;
  
    protected static Client client;
  
    protected OutputCollector collector;
    private EsConfig esConfig;
  
    public EsAbstractBolt(EsConfig esConfig) {
      Preconditions.checkNotNull(esConfig);
      this.esConfig = esConfig;
    }
  
    @Override
    public void prepare(Map map, TopologyContext topologyContext,
        OutputCollector outputCollector) {
      try {
        this.collector = outputCollector;
        synchronized (EsAbstractBolt.class) {
          if (client == null) {
            client = new StormEsClient(esConfig);
          }
        }
      } catch (Exception e) {
        throw new RuntimeException("unable to initialize EsBolt ", e);
      }
    }
  
    @Override
    public abstract void execute(Tuple tuple);
  
    static Client getClient() {
      return EsAbstractBolt.client;
    }
  
  }
  