text: /*
   *                         Vortex OpenSplice
   *
   *   This software and documentation are Copyright 2006 to TO_YEAR ADLINK
   *   Technology Limited, its affiliated companies and licensors. All rights
   *   reserved.
   *
   *   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.
   *
   */
  
  /*
      Hello World example.
      Instructions: 1. Run nodejs HelloWorldSubscriber.js
                    2. Run nodejs HelloWorldPublisher.js
  */
  
  'use strict';
  
  const dds = require('vortexdds');
  const HelloWorldTopic = require('./HelloWorldTopic');
  
  main();
  
  async function main(){
  
    let participant = new dds.Participant();
  
    let topic = await HelloWorldTopic.create(participant);
  
    let sqos = dds.QoS.subscriberDefault();
    sqos.partition = 'HelloWorld example';
    let sub = participant.createSubscriber(sqos, null);
  
    let rqos = dds.QoS.readerDefault();
    rqos.durability = dds.DurabilityKind.Transient;
    rqos.reliability = dds.ReliabilityKind.Reliable;
    let reader = sub.createReader(topic, rqos, null);
  
    console.log('=== [Subscriber] Ready ...');
  
    attemptTake(participant, reader, 0);
  }
  
  /* Attempt to take from the reader every 200 ms.
   * If a successful take occurs, we are done.
   * If a successful take does not occur after 100 attempts,
   * return.
   */
  function attemptTake(participant, reader, numberAttempts){
  
    setTimeout(function() {
      let takeArray = reader.take(1);
      if (takeArray.length > 0 && takeArray[0].info.valid_data) {
        console.log('=== [Subscriber] message received :');
        console.log('    userID  : ' + takeArray[0].sample.userID);
        console.log('    Message : ' + takeArray[0].sample.message);
      } else {
        if (numberAttempts < 100){
          return attemptTake(participant, reader, numberAttempts + 1);
        }
      }
      participant.delete();
      return;
    }, 200);
  }
  
  
  