content: /*
   *                         OpenSplice DDS
   *
   *   This software and documentation are Copyright 2006 to TO_YEAR PrismTech
   *   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.
   *
   */
  
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.HashSet;
  import java.util.List;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.TimeoutException;
  
  import org.omg.dds.core.Duration;
  import org.omg.dds.core.ServiceEnvironment;
  import org.omg.dds.core.WaitSet;
  import org.omg.dds.core.policy.Durability;
  import org.omg.dds.core.policy.Partition;
  import org.omg.dds.core.policy.PolicyFactory;
  import org.omg.dds.core.policy.Reliability;
  import org.omg.dds.core.status.Status;
  import org.omg.dds.domain.DomainParticipant;
  import org.omg.dds.domain.DomainParticipantFactory;
  import org.omg.dds.sub.DataReader;
  import org.omg.dds.sub.DataReaderQos;
  import org.omg.dds.sub.QueryCondition;
  import org.omg.dds.sub.Sample;
  import org.omg.dds.sub.Subscriber;
  import org.omg.dds.sub.Subscriber.DataState;
  import org.omg.dds.sub.SubscriberQos;
  import org.omg.dds.topic.Topic;
  import org.omg.dds.topic.TopicQos;
  
  import StockMarket.Stock;
  
  public class QueryConditionDataSubscriber {
  
      public static void main(String[] args) {
          try {
              String stkToSubscribe = null;
              String partitionName = "QueryCondition example";
              if (args.length > 0) {
                  stkToSubscribe = args[0];
              } else {
                  System.out.println("Invalid Arguments \n");
                  System.out.println("Expected argument MSFT or GE");
                  System.exit(-1);
              }
  
              System.setProperty(
                        ServiceEnvironment.IMPLEMENTATION_CLASS_NAME_PROPERTY,
                        "org.opensplice.dds.core.OsplServiceEnvironment");
              ServiceEnvironment env = ServiceEnvironment
                        .createInstance(QueryConditionDataSubscriber.class.getClassLoader());
  
              DomainParticipantFactory dpf = DomainParticipantFactory.getInstance(env);
  
              // create Domain Participant
              DomainParticipant participant = dpf.createParticipant();
  
              // create Topic with reliable, transient and ownership qos
              PolicyFactory policyFactory = env.getSPI().getPolicyFactory();
              Reliability reliable = policyFactory.Reliability().withReliable();
              Durability durability = policyFactory.Durability().withTransient();
              TopicQos topicQos = participant.getDefaultTopicQos().withPolicies(reliable,durability);
              Collection<Class<? extends Status>> status = new HashSet<Class<? extends Status>>();
              Topic<Stock> topic = participant.createTopic("StockTrackerExclusive", Stock.class,topicQos, null, status);
  
              // create Subscriber with partition qos
              Partition partition = policyFactory.Partition().withName(partitionName);
              SubscriberQos subQos = participant.getDefaultSubscriberQos().withPolicy(partition);
              Subscriber sub = participant.createSubscriber(subQos);
  
              // create dataReader with the attached listener
              DataReaderQos drQos = sub.copyFromTopicQos(sub.getDefaultDataReaderQos(),topic.getQos());
              DataReader<Stock> reader = sub.createDataReader(topic,drQos);
  
              // Read Events
              List<String> params = new ArrayList<String>();
              params.add(new String(stkToSubscribe));
              String expr = "ticker=%0";
              DataState ds = sub.createDataState();
              ds = ds.withAnyInstanceState()
                     .withAnyViewState()
                     .withAnySampleState();
              QueryCondition<Stock> queryCond = reader.createQueryCondition(ds,expr,params);
  
              // Create a waitset to wait for data matching our condition
              WaitSet myWS = WaitSet.newWaitSet(env);
              myWS.attachCondition(queryCond);
              Duration waitTimeout = Duration.newDuration(60, TimeUnit.SECONDS, env);
  
              boolean terminate = false;
              int count = 0;
              System.out.println("Ready");
              while (!terminate && count < 1500) { // We dont want the example to run indefinitely
                  /* wait until we got data that matches our condition */
                  try {
                      myWS.waitForConditions(waitTimeout);
                  } catch(TimeoutException te) {
                      System.out.println("Waitset timeout did you provide a valid stock to filter(MSFT or GE)?");
                  }
                  List<Sample<Stock>> samples = new ArrayList<Sample<Stock>>();
                  reader.select().dataState(ds).Content(expr,params).take(samples);
                  for (Sample<Stock> sample : samples) {
                      Stock stock = sample.getData();
                      if (stock != null) { /* Check if the sample is valid. */
                          if (stock.price == -1.0f) {
                              terminate = true;
                              break;
                          }
                          System.out.println(stock.ticker + ": "+ stock.price);
                      }
                  }
                  try {
                      Thread.sleep(200);
                  }
                  catch(InterruptedException ie) {
                      // nothing to do
                  }
                  ++count;
              }
              System.out.println("Market Closed");
  
              // clean up
              participant.close();
          } catch(Exception e) {
              System.out.println("Error occured: " + e.getMessage());
              e.printStackTrace();
          }
      }
  }
  