/* (c) Copyright, Real-Time Innovations, 2012.  All rights reserved. 
 * Author:  Gerardo Pardo-Castellote 
 */

package com.rti.dds.snippets;

import com.rti.dds.domain.*;
import com.rti.dds.domain.builtin.*;
import com.rti.dds.infrastructure.*;
import com.rti.dds.publication.builtin.*;
import com.rti.dds.subscription.*;
import com.rti.dds.subscription.builtin.*;
import com.rti.ndds.config.Version;


public class MonitorDiscoveryInformation  {
   static int verbosity  = 1;
           
   int domainId;
   DomainParticipant participant;
   ParticipantBuiltinTopicDataDataReader   participantsDR;
   PublicationBuiltinTopicDataDataReader   publicationsDR;
   SubscriptionBuiltinTopicDataDataReader  subscriptionsDR;
     
   final static int MAX_ACTIVE_CONDITIONS = 3; // We will only install e conditions on the
   ConditionSeq activeConditionSeq;
   private WaitSet discoveryWaitSet;
      
   public boolean start(int theDomainId) {        
       Version version = Version.get_instance ();
       System.out.println("Running RTI Connext version: " + version);
              
       domainId = theDomainId;
       DomainParticipantFactory factory = DomainParticipantFactory.get_instance();        
       DomainParticipantQos pQos = new DomainParticipantQos();
       
       factory.get_default_participant_qos(pQos);
       pQos.participant_name.name = "RTI Connext Spy Discovery Snippet";
       try {
           participant = factory.create_participant(
                   domainId, 
                   pQos, //DomainParticipantFactory.PARTICIPANT_QOS_DEFAULT, 
                   null, // listener
                   StatusKind.STATUS_MASK_NONE);
       } catch ( Exception e) {
           String lastStartError = "Error creating the DDS domain. Common causes are:"
               + "\n   - Lack of a network. E.g disconected wireless."
               + "\n   - A network interface that does not bind multicast addresses. In some platforms enabling using the TUN interface "
               + "\n      for (Open)VPN causes this. If this is your situation try configure (Open)VPN to use TAP instead.";
           
           System.out.println(lastStartError);
           return false;
       }
  
       // We count ourselves as a participant that is present

       // The "lookup_xxx" operations not only retrieve the builtin data-readers but also
       // activate the cacheing of discovered types. To save resources discovered types
       // are only saved in the builtin reader cache which is only active after calling
       // the corresponding "lookup_xxx" operation 
       participantsDR = (ParticipantBuiltinTopicDataDataReader)
           participant.get_builtin_subscriber().lookup_datareader("DCPSParticipant");
       
       publicationsDR = (PublicationBuiltinTopicDataDataReader) 
           participant.get_builtin_subscriber().lookup_datareader("DCPSPublication");
       
       subscriptionsDR = (SubscriptionBuiltinTopicDataDataReader) 
           participant.get_builtin_subscriber().lookup_datareader("DCPSSubscription");
       
       // Create a WaitSet object that can be used to block the calling thread until there is
       // discovery data to read. This avoids having to poll and this use CPU continuously. 
       discoveryWaitSet = new WaitSet();
       
       // Attach the conditions that would wakeup the waitset. In this case the arrival of data on
       // any of the builting datareaders
       discoveryWaitSet.attach_condition(participantsDR.get_statuscondition());
       participantsDR.get_statuscondition().set_enabled_statuses(StatusKind.DATA_AVAILABLE_STATUS);
       
       discoveryWaitSet.attach_condition(publicationsDR.get_statuscondition());
       publicationsDR.get_statuscondition().set_enabled_statuses(StatusKind.DATA_AVAILABLE_STATUS);
       
       discoveryWaitSet.attach_condition(subscriptionsDR.get_statuscondition());
       subscriptionsDR.get_statuscondition().set_enabled_statuses(StatusKind.DATA_AVAILABLE_STATUS);
       
       activeConditionSeq = new ConditionSeq(MAX_ACTIVE_CONDITIONS);

       return true;
   }

   
   public void printDiscoveredParticipants() {
       ParticipantBuiltinTopicData participantData = new ParticipantBuiltinTopicData();;
       SampleInfo info = new SampleInfo();;
       
       try {
           while ( true ) {          
               participantsDR.take_next_sample(participantData, info);

               if ( info.instance_state == InstanceStateKind.ALIVE_INSTANCE_STATE ) {
                   System.out.println("Participant (New)" +
                           " messageNum: " + info.reception_sequence_number.low +
                           " name: \"" + participantData.participant_name.name + "\"" +
                           " created at: " + info.source_timestamp +
                           " detected at: " + info.reception_timestamp +
                           " source sn: " + info.publication_sequence_number.low +
                           " handle: " + info.instance_handle.toString() +
                           " key: " + participantData.key.toString() +

                           " full details: " + participantData.toString());
               } else {
                   String dissapearReason;
                   if ( info.instance_state == InstanceStateKind.NOT_ALIVE_DISPOSED_INSTANCE_STATE  ) {
                       dissapearReason = "deleted";
                   } else {
                       dissapearReason = "lost connection";
                   }     
                   if ( info.valid_data ) {
                       System.out.println("Participant (Dissapeared - "+ dissapearReason +"):" +
                               " messageNum: "  + info.reception_sequence_number.low +
                               " name: \"" + participantData.participant_name.name + "\"" +
                               " detected at: " + info.reception_timestamp +
                               " source sn: " + info.publication_sequence_number.low +
                               " handle: " + info.instance_handle.toString() +
                               " key: " + participantData.key.toString() +
                               " full details: " + participantData.toString());
                   }
                   else {
                       System.out.println("Participant (Dissapeared - "+ dissapearReason +"):" +
                               " messageNum: "  + info.reception_sequence_number.low +
                               " source sn: " + info.publication_sequence_number.low +
                               " handle: " + info.instance_handle.toString() +
                               " detected at: " + info.reception_timestamp );                     
                   }
               }
           }

       } 
       catch (RETCODE_NO_DATA noData) {  } 

       finally {  }
   }


   public void printDiscoveredDataWriters() {
       PublicationBuiltinTopicData publicationData = new PublicationBuiltinTopicData();
       SampleInfo info = new SampleInfo();
      
       try {
           while ( true ) {
               publicationsDR.take_next_sample(publicationData, info);
               
               if ( info.instance_state == InstanceStateKind.ALIVE_INSTANCE_STATE ) {
                  System.out.println("DataWriter (New)" +
                           " messageNum: " + info.reception_sequence_number.low +
                           " name: \""  + publicationData.publication_name.name + "\"" +
                           " topic: " + publicationData.topic_name +
                           " type: "  + publicationData.type_name +
                           " created at: " + info.source_timestamp +
                           " detected at: " + info.reception_timestamp +
                           " handle: " + info.instance_handle.toString() +
                           " full details: " + publicationData.toString());

               } else {
                   String dissapearReason;
                   if ( info.instance_state == InstanceStateKind.NOT_ALIVE_DISPOSED_INSTANCE_STATE  ) {
                       dissapearReason = "deleted";
                   } else {
                       dissapearReason = "lost connection";
                   }    
                   if ( info.valid_data ) {
                       System.out.println("DataWriter (Dissapeared - "+ dissapearReason +"):" +
                               " messageNum: " + info.reception_sequence_number.low +
                               " name: \""  + publicationData.publication_name.name + "\"" +
                               " topic: " + publicationData.topic_name +
                               " type: "  + publicationData.type_name +
                               " created at: " + info.source_timestamp +
                               " detected at: " + info.reception_timestamp +
                               " handle: " + info.instance_handle.toString() +
                               " full details: " + publicationData.toString());
                   } else {
                       System.out.println("DataWriter (Dissapeared - "+ dissapearReason +"):" +
                               " messageNum: " + info.reception_sequence_number.low +
                               " handle: " + info.instance_handle.toString() +
                               " detected at: " + info.reception_timestamp );                       
                   }
               }
            }
       }
       catch (RETCODE_NO_DATA noData) {    } 
       // catch (RETCODE_BAD_PARAMETER badParam) {   }
       finally {  }
   }

   public void printDiscoveredDataReaders() {
       SubscriptionBuiltinTopicData subscriptionData = new SubscriptionBuiltinTopicData();;
       SampleInfo info = new SampleInfo();;
 
       try {
           
           while ( true ) {              
               subscriptionsDR.take_next_sample(subscriptionData, info);

               if ( info.instance_state == InstanceStateKind.ALIVE_INSTANCE_STATE ) {
                   System.out.println("DataReader (New)" +
                            " messageNum: " + info.reception_sequence_number.low +
                            " name: \""  + subscriptionData.subscription_name.name + "\"" +
                            " topic: " + subscriptionData.topic_name +
                            " type: "  + subscriptionData.type_name +
                            " created at: " + info.source_timestamp +
                            " detected at: " + info.reception_timestamp +
                            " handle: " + info.instance_handle.toString() +
                            " full details: " + subscriptionData.toString());

               } else {
                   String dissapearReason;
                   if ( info.instance_state == InstanceStateKind.NOT_ALIVE_DISPOSED_INSTANCE_STATE  ) {
                       dissapearReason = "deleted";
                   } else {
                       dissapearReason = "lost connection";
                   }    
                   if ( info.valid_data ) {
                       System.out.println("DataReader (Dissapeared - "+ dissapearReason +"):" +
                               " messageNum: " + info.reception_sequence_number.low +
                               " name: \""  + subscriptionData.subscription_name.name + "\"" +
                               " topic: " + subscriptionData.topic_name +
                               " type: "  + subscriptionData.type_name +
                               " created at: " + info.source_timestamp +
                               " detected at: " + info.reception_timestamp +
                               " handle: " + info.instance_handle.toString() +
                               " full details: " + subscriptionData.toString());
                   } else {
                       System.out.println("DataReader (Dissapeared - "+ dissapearReason +"):" +
                               " messageNum: " + info.reception_sequence_number.low +
                               " handle: " + info.instance_handle.toString() +
                               " detected at: " + info.reception_timestamp );                       
                   }
               }

           }
       }
       catch (RETCODE_NO_DATA noData) {  }
      // catch (RETCODE_BAD_PARAMETER badParam) {  } 
       finally {  }

   }

   public void waitForDiscoveryData() {
       Duration_t waitDuration = 
           new Duration_t(Duration_t.DURATION_INFINITE_SEC, Duration_t.DURATION_INFINITE_NSEC);
       
       System.out.println("waitForDiscoveryData");
       discoveryWaitSet.wait(activeConditionSeq, waitDuration);
   }
   
   public void printReceivedDiscoveredData() {
       System.out.println("printReceivedDiscoveredData");
       if ( participantsDR.get_statuscondition().get_trigger_value() ) {
           printDiscoveredParticipants();
       }
       if ( publicationsDR.get_statuscondition().get_trigger_value() ) {
           printDiscoveredDataWriters();
       }
       if ( subscriptionsDR.get_statuscondition().get_trigger_value() ) {
           printDiscoveredDataReaders();
       }

   }

   public static void main(String args[]) throws InterruptedException {
       
       String NDDSHOME = System.getenv("NDDSHOME");  
       String DYLD_LIBRARY_PATH = System.getenv("DYLD_LIBRARY_PATH");  
       System.out.println("NDDSHOME="+ NDDSHOME);  
       System.out.println("DYLD_LIBRARY_PATH="+ DYLD_LIBRARY_PATH);  
       int domainId = 0;
       
       MonitorDiscoveryInformation discoverySpy = new MonitorDiscoveryInformation();
       if ( !discoverySpy.start(domainId) ) {
           return;
       }
       
       while (true) {
           discoverySpy.waitForDiscoveryData();
           discoverySpy.printReceivedDiscoveredData();
       }
    }
}