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.jstorm.example.unittests.order;
  
  import backtype.storm.spout.SpoutOutputCollector;
  import backtype.storm.task.TopologyContext;
  import backtype.storm.topology.OutputFieldsDeclarer;
  import backtype.storm.topology.base.BaseRichSpout;
  import backtype.storm.tuple.Fields;
  import backtype.storm.tuple.Values;
  import com.alibaba.jstorm.common.metric.AsmCounter;
  import com.alibaba.jstorm.common.metric.AsmMetric;
  import com.alibaba.jstorm.metric.MetricClient;
  import com.alibaba.jstorm.utils.JStormUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.util.Map;
  
  /**
   * @author binyang.dby
   */
  public class InOrderTestSpout extends BaseRichSpout
  {
      private Logger LOG = LoggerFactory.getLogger(InOrderTestSpout.class);
      private long limit;
      private transient SpoutOutputCollector collector;
      private int task;
      private int content;
      private transient MetricClient metricClient;
      private transient AsmCounter emitCounter;
  
      public InOrderTestSpout(long limit) {
          this.limit = limit;
      }
  
      @Override
      public void declareOutputFields(OutputFieldsDeclarer declarer) {
          declarer.declare(new Fields("c1", "c2"));
      }
  
      @Override
      public void open(Map conf, TopologyContext context, SpoutOutputCollector collector) {
          this.collector = collector;
          this.task = context.getThisTaskIndex();
          this.metricClient = new MetricClient(context);
          this.emitCounter = metricClient.registerCounter(InOrderTestMetricsDef.METRIC_SPOUT_EMIT);
          this.emitCounter.setOp(AsmMetric.MetricOp.LOG & AsmMetric.MetricOp.REPORT);
          LOG.info("open. task = " + task);
      }
  
      @Override
      public void nextTuple() {
          if(content >= limit) {
              JStormUtils.sleepMs(1000);
              return;
          }
  
          Values values = new Values(task, content);
          collector.emit(values, "msg");
          content++;
          emitCounter.inc();
          LOG.info("nextTuple. task = " + task + " content = " + content);
      }
  }
  