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.flink.performance.test;
  
  import org.apache.flink.api.common.functions.MapFunction;
  import org.apache.flink.streaming.api.datastream.DataStream;
  import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
  import org.apache.flink.streaming.api.functions.source.SourceFunction;
  
  /**
   * @author Jark (wuchong.wc@alibaba-inc.com)
   */
  public class StreamSequence {
  
      public static void main(String[] args) throws Exception {
          StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
  
          // get input data
          DataStream<Long> text = env.addSource(new SequenceSource(10)).slotSharingGroup("123");
  
          DataStream<Long> counts = text.map(new MapFunction<Long, Long>() {
              @Override
              public Long map(Long aLong) throws Exception {
                  return aLong;
              }
          });
  
  //        counts.print();
  
  //        counts.print();
  
          // execute program
          env.execute("StreamSequence");
      }
  
      public static class SequenceSource implements SourceFunction<Long> {
          private volatile boolean active = true;
          private int sendNumEachTime;
          private long count = 0;
  
          public SequenceSource(int sendNumEachTime) {
              this.sendNumEachTime = sendNumEachTime;
          }
  
          @Override
          public void run(SourceContext<Long> ctx) throws Exception {
              while(active) {
                  int sendNum = sendNumEachTime;
                  while (--sendNum >= 0) {
                      ++count;
                      ctx.collect(count);
                  }
              }
          }
  
          @Override
          public void cancel() {
  
          }
      }
  }
  