/*******************************************************************************
 (c) 2005-2014 Copyright, Real-Time Innovations, Inc.  All rights reserved.
 RTI grants Licensee a license to use, modify, compile, and create derivative
 works of the Software.  Licensee has the right to distribute object form only
 for use with RTI products.  The Software is provided "as is", with no warranty
 of any type, including any warranty for fitness for any purpose. RTI is under
 no obligation to maintain or support the Software.  RTI shall not be liable for
 any incidental or consequential damages arising out of the use or inability to
 use the software.
 ******************************************************************************/
using System;
using System.Collections.Generic;
using System.Text;
/* waitsets_subscriber.cs

   A subscription example

   This file is derived from code automatically generated by the rtiddsgen 
   command:

   rtiddsgen -language C# -example <arch> waitsets.idl

   Example subscription of type waitsets automatically generated by 
   'rtiddsgen'. To test them, follow these steps:

   (1) Compile this file and the example publication.

   (2) Start the subscription with the command
       objs\<arch>\waitsets_subscriber <domain_id> <sample_count>

   (3) Start the publication with the command
       objs\<arch>\waitsets_publisher <domain_id> <sample_count>

   (4) [Optional] Specify the list of discovery initial peers and 
       multicast receive addresses via an environment variable or a file 
       (in the current working directory) called NDDS_DISCOVERY_PEERS. 

   You can run any number of publishers and subscribers programs, and can 
   add and remove them dynamically from the domain.
                                   
   Example:
        
       To run the example application on domain <domain_id>:
                          
       bin\<Debug|Release>\waitsets_publisher <domain_id> <sample_count>  
       bin\<Debug|Release>\waitsets_subscriber <domain_id> <sample_count>
              
       
modification history
------------ -------
*/

public class waitsetsSubscriber {

    /* We don't need to use listeners as we are going to use Waitsets and 
     * Conditions so we have removed the auto generated code for listeners here 
     */

    public static void Main( string[] args ) {

        // --- Get domain ID --- //
        int domain_id = 0;
        if (args.Length >= 1) {
            domain_id = Int32.Parse(args[0]);
        }

        // --- Get max loop count; 0 means infinite loop  --- //
        int sample_count = 0;
        if (args.Length >= 2) {
            sample_count = Int32.Parse(args[1]);
        }

        /* Uncomment this to turn on additional logging
        NDDS.ConfigLogger.get_instance().set_verbosity_by_category(
            NDDS.LogCategory.NDDS_CONFIG_LOG_CATEGORY_API, 
            NDDS.LogVerbosity.NDDS_CONFIG_LOG_VERBOSITY_STATUS_ALL);
        */

        // --- Run --- //
        try {
            waitsetsSubscriber.subscribe(
                domain_id, sample_count);
        } catch (DDS.Exception) {
            Console.WriteLine("error in subscriber");
        }
    }

    static void subscribe( int domain_id, int sample_count ) {

        // --- Create participant --- //

        /* To customize the participant QoS, use 
           the configuration file USER_QOS_PROFILES.xml */
        DDS.DomainParticipant participant =
            DDS.DomainParticipantFactory.get_instance().create_participant(
                domain_id,
                DDS.DomainParticipantFactory.PARTICIPANT_QOS_DEFAULT,
                null /* listener */,
                DDS.StatusMask.STATUS_MASK_NONE);
        if (participant == null) {
            shutdown(participant);
            throw new ApplicationException("create_participant error");
        }

        // --- Create subscriber --- //

        /* To customize the subscriber QoS, use 
           the configuration file USER_QOS_PROFILES.xml */
        DDS.Subscriber subscriber = participant.create_subscriber(
            DDS.DomainParticipant.SUBSCRIBER_QOS_DEFAULT,
            null /* listener */,
            DDS.StatusMask.STATUS_MASK_NONE);
        if (subscriber == null) {
            shutdown(participant);
            throw new ApplicationException("create_subscriber error");
        }

        // --- Create topic --- //

        /* Register the type before creating the topic */
        System.String type_name = waitsetsTypeSupport.get_type_name();
        try {
            waitsetsTypeSupport.register_type(
                participant, type_name);
        } catch (DDS.Exception e) {
            Console.WriteLine("register_type error {0}", e);
            shutdown(participant);
            throw e;
        }

        /* To customize the topic QoS, use 
           the configuration file USER_QOS_PROFILES.xml */
        DDS.Topic topic = participant.create_topic(
            "Example waitsets",
            type_name,
            DDS.DomainParticipant.TOPIC_QOS_DEFAULT,
            null /* listener */,
            DDS.StatusMask.STATUS_MASK_NONE);
        if (topic == null) {
            shutdown(participant);
            throw new ApplicationException("create_topic error");
        }

        // --- Create reader --- //

        /* To customize the data reader QoS, use 
           the configuration file USER_QOS_PROFILES.xml */
        DDS.DataReader reader = subscriber.create_datareader(
            topic,
            DDS.Subscriber.DATAREADER_QOS_DEFAULT,
            null,
            DDS.StatusMask.STATUS_MASK_ALL);
        if (reader == null) {
            shutdown(participant);
            throw new ApplicationException("create_datareader error");
        }

        /* If you want to change the DataReader's QoS programmatically rather 
         * than using the XML file, you will need to add the following lines to 
         * your code and comment out the create_datareader call above.
         *
         * In this case, we reduce the liveliness timeout period to trigger the
         * StatusCondition DDS.StatusKind.LIVELINESS_CHANGED_STATUS
         */
        /*
        DDS.DataReaderQos datawriter_qos = new DDS.DataReaderQos();
        try {
            subscriber.get_default_datareader_qos(datawriter_qos);
        } catch (DDS.Exception e) {
            Console.WriteLine("get_default_datareader_qos error {0}", e);
            shutdown(participant);
            throw e;
        }
        datawriter_qos.liveliness.lease_duration.sec = 2;
        datawriter_qos.liveliness.lease_duration.nanosec = 0;

        reader = subscriber.create_datareader(topic, datawriter_qos,
            null, DDS.StatusMask.STATUS_MASK_NONE);
        if (reader == null) {
            shutdown(participant);
            throw new ApplicationException("create_datawriter_qos error");
        }
        */

        /* Create read condition
         * ---------------------
         * Note that the Read Conditions are dependent on both incoming
         * data as well as sample state. Thus, this method has more
         * overhead than adding a DDS.StatusKind.DATA_AVAILABLE_STATUS
         * StatusCondition. We show it here purely for reference
         */
        DDS.ReadCondition read_condition = reader.create_readcondition(
            DDS.SampleStateKind.NOT_READ_SAMPLE_STATE,
            DDS.ViewStateKind.ANY_VIEW_STATE,
            DDS.InstanceStateKind.ANY_INSTANCE_STATE);
        if (read_condition == null) {
            shutdown(participant);
            throw new ApplicationException("create_readcondition error");
        }

        /* Get status conditions
         * ---------------------
         * Each entity may have an attached Status Condition. To modify the
         * statuses we need to get the reader's Status Conditions first.
         */

        DDS.StatusCondition status_condition = reader.get_statuscondition();
        if (status_condition.get_entity() == null) {
            shutdown(participant);
            throw new ApplicationException("get_statuscondition error");
        }

        /* Set enabled statuses
         * --------------------
         * Now that we have the Status Condition, we are going to enable the
         * statuses we are interested in: 
         * DDS.StatusKind.SUBSCRIPTION_MATCHED_STATUS
         * and DDS.StatusKind.LIVELINESS_CHANGED_STATUS.
         */
        try {
            status_condition.set_enabled_statuses(
                DDS.StatusMask.STATUS_MASK_NONE |
                (DDS.StatusMask)DDS.StatusKind.SUBSCRIPTION_MATCHED_STATUS |
                (DDS.StatusMask)DDS.StatusKind.LIVELINESS_CHANGED_STATUS);
        } catch (DDS.Exception e) {
            Console.WriteLine("set_enabled_statuses error {0}", e);
            shutdown(participant);
            throw e;
        }

        /* Create and attach conditions to the WaitSet
         * -------------------------------------------
         * Finally, we create the WaitSet and attach both the Read Conditions
         * and the Status Condition to it.
         */
        DDS.WaitSet waitset = new DDS.WaitSet();

        /* Attach Read Conditions */
        try {
            waitset.attach_condition(read_condition);
        } catch (DDS.Exception e) {
            Console.WriteLine("attach_read_condition error {0}", e);
            shutdown(participant);
            throw e;
        }

        /* Attach Status Conditions */
        try {
            waitset.attach_condition(status_condition);
        } catch (DDS.Exception e) {
            Console.WriteLine("attach_status_condition error {0}", e);
            shutdown(participant);
            throw e;
        }

        /* Narrow the reader into your specific data type */
        waitsetsDataReader waitsets_reader =
            (waitsetsDataReader)reader;


        /* Main loop */
        for (int count = 0; (sample_count == 0) || (count < sample_count); 
                ++count) {
            DDS.ConditionSeq active_conditions_seq = new DDS.ConditionSeq();
            DDS.Duration_t timeout;
            timeout.nanosec = (uint)500000000;
            timeout.sec = 1;

            /* wait() blocks execution of the thread until one or more attached
             * Conditions become true, or until a user-specified timeout expires
             */
            try {
                waitset.wait(active_conditions_seq, timeout);
            } catch (DDS.Retcode_Timeout) {
                Console.WriteLine("Wait timed out!! No conditions were " + 
                    "triggered.");
                continue;
            } catch (DDS.Exception e) {
                Console.WriteLine("wait error {0}", e);
                break;
            }

            /* Get the number of active conditions */
            int active_conditions = active_conditions_seq.length;
            Console.WriteLine("Got {0} active conditions", active_conditions);

            for (int i = 0; i < active_conditions; i++) {
                /* Now we compare the current condition with the Status
                 * Conditions and the Read Conditions previously defined. If
                 * they match, we print the condition that was triggered.*/

                /* Compare with Status Conditions */
                if (active_conditions_seq.get_at(i) == status_condition) {
                    /* Get the status changes so we can check which status
                     * condition triggered. */
                    DDS.StatusMask triggeredmask =
                        waitsets_reader.get_status_changes();

                    /* Liveliness changed */
                    DDS.StatusMask test = triggeredmask &
                        (DDS.StatusMask)DDS.StatusKind.
                            LIVELINESS_CHANGED_STATUS;
                    if (test != DDS.StatusMask.STATUS_MASK_NONE) {
                        DDS.LivelinessChangedStatus st = 
                            new DDS.LivelinessChangedStatus();
                        waitsets_reader.get_liveliness_changed_status(ref st);
                        Console.WriteLine("Liveliness changed => " + 
                            "Active writers = {0}", st.alive_count);
                    }

                    /* Subscription matched */
                    test = triggeredmask &
                        (DDS.StatusMask)DDS.StatusKind.
                            SUBSCRIPTION_MATCHED_STATUS;
                    if (test != DDS.StatusMask.STATUS_MASK_NONE) {
                        DDS.SubscriptionMatchedStatus st = 
                            new DDS.SubscriptionMatchedStatus();
                        waitsets_reader.get_subscription_matched_status(ref st);
                        Console.WriteLine("Subscription matched => " + 
                            "Cumulative matches = {0}", st.total_count);
                    }
                }

                /* Compare with Read Conditions */
                else if (active_conditions_seq.get_at(i) == read_condition) {
                    /* Current conditions match our conditions to read data, so
                     * we can read data just like we would do in any other
                     * example. */
                    waitsetsSeq data_seq = new waitsetsSeq();
                    DDS.SampleInfoSeq info_seq = new DDS.SampleInfoSeq();

                    /* You may want to call take_w_condition() or
                     * read_w_condition() on the Data Reader. This way you will
                     * use the same status masks that were set on the Read 
                     * Condition.
                     * This is just a suggestion, you can always use
                     * read() or take() like in any other example.
                     */
                    bool follow = true;
                    while (follow) {
                        try {
                            waitsets_reader.take_w_condition(
                                data_seq, info_seq,
	                            DDS.ResourceLimitsQosPolicy.LENGTH_UNLIMITED,
	                            read_condition);
	
	                        for (int j = 0; j < data_seq.length; ++j) {
	                            if (!info_seq.get_at(j).valid_data) {
	                                Console.WriteLine("Got metadata");
	                                continue;
	                            }
	                            waitsetsTypeSupport.print_data(
	                                data_seq.get_at(j));
	                        }
	                    } catch (DDS.Retcode_NoData) {
	                        /* When there isn't data, the subscriber stop to
                             * take samples
	                         */
	                        follow = false;
	                    } finally {
	                        waitsets_reader.return_loan(data_seq, info_seq);
	                    }
                    }                    
                }
            }
        }

        // --- Shutdown --- //

        /* Delete all entities */
        shutdown(participant);
    }


    static void shutdown(
        DDS.DomainParticipant participant ) {

        /* Delete all entities */

        if (participant != null) {
            participant.delete_contained_entities();
            DDS.DomainParticipantFactory.get_instance().delete_participant(
                ref participant);
        }

        /* RTI Connext provides finalize_instance() method on
           domain participant factory for users who want to release memory
           used by the participant factory. Uncomment the following block of
           code for clean destruction of the singleton. */
        /*
        try {
            DDS.DomainParticipantFactory.finalize_instance();
        }
        catch(DDS.Exception e) {
            Console.WriteLine("finalize_instance error {0}", e);
            throw e;
        }
        */
    }
}