DDS_QueryCondition createQueryCondition(DDS_DataReader dataReader, DDS_char *query_string, DDS_char* queryParameter)
{
DDS_StringSeq* query_parameters = DDS_StringSeq__alloc();
DDS_QueryCondition queryCondition;
query_parameters->_length = 1;
query_parameters->_maximum = 1;
query_parameters->_release = TRUE;
query_parameters->_buffer = DDS_StringSeq_allocbuf (1);
checkHandle(query_parameters->_buffer, "DDS_StringSeq_allocbuf");
query_parameters->_buffer[0] = DDS_string_dup (queryParameter);
checkHandle(query_parameters->_buffer[0], "DDS_string_dup");
queryCondition = DDS_DataReader_create_querycondition(dataReader,
DDS_ANY_SAMPLE_STATE,
DDS_ANY_VIEW_STATE,
DDS_ANY_INSTANCE_STATE,
query_string,
query_parameters);
checkHandle(queryCondition, "DDS_DataReader_create_querycondition");
DDS_free(query_parameters);
return queryCondition;
}
int main (int argc, char ** argv)
#endif
{
/* Generic DDS entities */
DDS_DomainParticipant participant;
DDS_Topic chatMessageTopic;
DDS_Topic nameServiceTopic;
DDS_Subscriber chatSubscriber;
DDS_QueryCondition singleUser;
DDS_ReadCondition newUser;
DDS_StatusCondition leftUser;
DDS_GuardCondition guard;
DDS_WaitSet userLoadWS;
DDS_LivelinessChangedStatus livChangStatus;
/* QosPolicy holders */
DDS_TopicQos *setting_topic_qos;
DDS_TopicQos *reliable_topic_qos;
DDS_SubscriberQos *sub_qos;
DDS_DataReaderQos *message_qos;
/* DDS Identifiers */
DDS_DomainId_t domain = NULL;
DDS_ReturnCode_t status;
DDS_ConditionSeq *guardList = NULL;
DDS_Duration_t timeout = DDS_DURATION_INFINITE;
/* Type-specific DDS entities */
Chat_ChatMessageTypeSupport chatMessageTS;
Chat_NameServiceTypeSupport nameServiceTS;
Chat_NameServiceDataReader nameServer;
Chat_ChatMessageDataReader loadAdmin;
DDS_sequence_Chat_ChatMessage msgList = { 0, 0, DDS_OBJECT_NIL, FALSE };
DDS_sequence_Chat_NameService nsList = { 0, 0, DDS_OBJECT_NIL, FALSE };
DDS_SampleInfoSeq infoSeq = { 0, 0, DDS_OBJECT_NIL, FALSE };
DDS_SampleInfoSeq infoSeq2 = { 0, 0, DDS_OBJECT_NIL, FALSE };
/* Others */
DDS_StringSeq args;
int closed = 0;
DDS_unsigned_long i, j;
DDS_long prevCount = 0;
char *partitionName;
char *chatMessageTypeName = NULL;
char *nameServiceTypeName = NULL;
pthread_t tid;
pthread_attr_t tattr;
printf("Starting UserLoad example.\n");
fflush(stdout);
/* Create a DomainParticipant (using the 'TheParticipantFactory' convenience macro). */
participant = DDS_DomainParticipantFactory_create_participant (
DDS_TheParticipantFactory,
domain,
DDS_PARTICIPANT_QOS_DEFAULT,
NULL,
DDS_STATUS_MASK_NONE);
checkHandle(participant, "DDS_DomainParticipantFactory_create_participant");
/* Register the required datatype for ChatMessage. */
chatMessageTS = Chat_ChatMessageTypeSupport__alloc();
checkHandle(chatMessageTS, "Chat_ChatMessageTypeSupport__alloc");
chatMessageTypeName = Chat_ChatMessageTypeSupport_get_type_name(chatMessageTS);
status = Chat_ChatMessageTypeSupport_register_type(
chatMessageTS,
participant,
chatMessageTypeName);
checkStatus(status, "Chat_ChatMessageTypeSupport_register_type");
/* Register the required datatype for NameService. */
nameServiceTS = Chat_NameServiceTypeSupport__alloc();
checkHandle(nameServiceTS, "Chat_NameServiceTypeSupport__alloc");
nameServiceTypeName = Chat_NameServiceTypeSupport_get_type_name(nameServiceTS);
status = Chat_NameServiceTypeSupport_register_type(
nameServiceTS,
participant,
nameServiceTypeName);
checkStatus(status, "Chat_NameServiceTypeSupport_register_type");
/* Set the ReliabilityQosPolicy to RELIABLE. */
reliable_topic_qos = DDS_TopicQos__alloc();
checkHandle(reliable_topic_qos, "DDS_TopicQos__alloc");
status = DDS_DomainParticipant_get_default_topic_qos(participant, reliable_topic_qos);
checkStatus(status, "DDS_DomainParticipant_get_default_topic_qos");
reliable_topic_qos->reliability.kind = DDS_RELIABLE_RELIABILITY_QOS;
/* Make the tailored QoS the new default. */
status = DDS_DomainParticipant_set_default_topic_qos(participant, reliable_topic_qos);
checkStatus(status, "DDS_DomainParticipant_set_default_topic_qos");
/* Use the changed policy when defining the ChatMessage topic */
chatMessageTopic = DDS_DomainParticipant_create_topic(
participant,
"Chat_ChatMessage",
chatMessageTypeName,
reliable_topic_qos,
NULL,
DDS_STATUS_MASK_NONE);
checkHandle(chatMessageTopic, "DDS_DomainParticipant_create_topic (ChatMessage)");
/* Set the DurabilityQosPolicy to TRANSIENT. */
setting_topic_qos = DDS_TopicQos__alloc();
checkHandle(setting_topic_qos, "DDS_TopicQos__alloc");
status = DDS_DomainParticipant_get_default_topic_qos(participant, setting_topic_qos);
checkStatus(status, "DDS_DomainParticipant_get_default_topic_qos");
setting_topic_qos->durability.kind = DDS_TRANSIENT_DURABILITY_QOS;
/* Create the NameService Topic. */
nameServiceTopic = DDS_DomainParticipant_create_topic(
participant,
"Chat_NameService",
nameServiceTypeName,
setting_topic_qos,
NULL,
DDS_STATUS_MASK_NONE);
checkHandle(nameServiceTopic, "DDS_DomainParticipant_create_topic");
/* Adapt the default SubscriberQos to read from the "ChatRoom" Partition. */
partitionName = "ChatRoom";
sub_qos = DDS_SubscriberQos__alloc();
checkHandle(sub_qos, "DDS_SubscriberQos__alloc");
status = DDS_DomainParticipant_get_default_subscriber_qos (participant, sub_qos);
checkStatus(status, "DDS_DomainParticipant_get_default_subscriber_qos");
sub_qos->partition.name._length = 1;
sub_qos->partition.name._maximum = 1;
sub_qos->partition.name._buffer = DDS_StringSeq_allocbuf (1);
checkHandle(sub_qos->partition.name._buffer, "DDS_StringSeq_allocbuf");
sub_qos->partition.name._buffer[0] = DDS_string_alloc (strlen(partitionName) + 1);
checkHandle(sub_qos->partition.name._buffer[0], "DDS_string_alloc");
strcpy (sub_qos->partition.name._buffer[0], partitionName);
/* Create a Subscriber for the UserLoad application. */
chatSubscriber = DDS_DomainParticipant_create_subscriber(participant, sub_qos, NULL, DDS_STATUS_MASK_NONE);
checkHandle(chatSubscriber, "DDS_DomainParticipant_create_subscriber");
/* Create a DataReader for the NameService Topic (using the appropriate QoS). */
nameServer = DDS_Subscriber_create_datareader(
chatSubscriber,
nameServiceTopic,
DDS_DATAREADER_QOS_USE_TOPIC_QOS,
NULL,
DDS_STATUS_MASK_NONE);
checkHandle(nameServer, "DDS_Subscriber_create_datareader (NameService)");
/* Adapt the DataReaderQos for the ChatMessageDataReader to keep track of all messages. */
message_qos = DDS_DataReaderQos__alloc();
checkHandle(message_qos, "DDS_DataReaderQos__alloc");
status = DDS_Subscriber_get_default_datareader_qos(chatSubscriber, message_qos);
checkStatus(status, "DDS_Subscriber_get_default_datareader_qos");
status = DDS_Subscriber_copy_from_topic_qos(chatSubscriber, message_qos, reliable_topic_qos);
checkStatus(status, "DDS_Subscriber_copy_from_topic_qos");
message_qos->history.kind = DDS_KEEP_ALL_HISTORY_QOS;
/* Create a DataReader for the ChatMessage Topic (using the appropriate QoS). */
loadAdmin = DDS_Subscriber_create_datareader(
chatSubscriber,
chatMessageTopic,
message_qos,
NULL,
DDS_STATUS_MASK_NONE);
checkHandle(loadAdmin, "DDS_Subscriber_create_datareader (ChatMessage)");
/* Initialize the Query Arguments. */
args._length = 1;
args._maximum = 1;
args._buffer = DDS_StringSeq_allocbuf(1);
checkHandle(args._buffer, "DDS_StringSeq_allocbuf");
args._buffer[0] = DDS_string_alloc (12); /* Enough for maximum size numbers. */
checkHandle(args._buffer[0], "DDS_string_alloc");
sprintf(args._buffer[0], "%d", 0);
/* Create a QueryCondition that will contain all messages with userID=ownID */
singleUser = DDS_DataReader_create_querycondition(
loadAdmin,
DDS_ANY_SAMPLE_STATE,
DDS_ANY_VIEW_STATE,
DDS_ANY_INSTANCE_STATE,
"userID=%0",
&args);
checkHandle(singleUser, "DDS_DataReader_create_querycondition (singleUser Query)");
/* Create a ReadCondition that will contain new users only */
newUser = DDS_DataReader_create_readcondition(
nameServer,
DDS_NOT_READ_SAMPLE_STATE,
DDS_NEW_VIEW_STATE,
DDS_ALIVE_INSTANCE_STATE);
checkHandle(newUser, "DDS_DataReader_create_readcondition (newUser)");
/* Obtain a StatusCondition that triggers only when a Writer changes Liveliness */
leftUser = DDS_DataReader_get_statuscondition(loadAdmin);
checkHandle(leftUser, "DDS_DataReader_get_statuscondition");
status = DDS_StatusCondition_set_enabled_statuses(leftUser, DDS_LIVELINESS_CHANGED_STATUS);
checkStatus(status, "DDS_StatusCondition_set_enabled_statuses");
/* Create a bare guard which will be used to close the room */
escape = DDS_GuardCondition__alloc();
checkHandle(escape, "DDS_GuardCondition__alloc");
/* Create a waitset and add the ReadConditions */
userLoadWS = DDS_WaitSet__alloc();
checkHandle(userLoadWS, "DDS_WaitSet__alloc");
status = DDS_WaitSet_attach_condition(userLoadWS, newUser);
checkStatus(status, "DDS_WaitSet_attach_condition (newUser)");
status = DDS_WaitSet_attach_condition(userLoadWS, leftUser);
checkStatus(status, "DDS_WaitSet_attach_condition (leftUser)");
status = DDS_WaitSet_attach_condition(userLoadWS, escape);
checkStatus(status, "DDS_WaitSet_attach_condition (escape)");
/* Initialize and pre-allocate the GuardList used to obtain the triggered Conditions. */
guardList = DDS_ConditionSeq__alloc();
checkHandle(guardList, "DDS_ConditionSeq__alloc");
guardList->_maximum = 3;
guardList->_length = 0;
guardList->_buffer = DDS_ConditionSeq_allocbuf(3);
checkHandle(guardList->_buffer, "DDS_ConditionSeq_allocbuf");
/* Remove all known Users that are not currently active. */
status = Chat_NameServiceDataReader_take(
nameServer,
&nsList,
&infoSeq,
DDS_LENGTH_UNLIMITED,
DDS_ANY_SAMPLE_STATE,
DDS_ANY_VIEW_STATE,
DDS_NOT_ALIVE_INSTANCE_STATE);
checkStatus(status, "Chat_NameServiceDataReader_take");
status = Chat_NameServiceDataReader_return_loan(nameServer, &nsList, &infoSeq);
checkStatus(status, "Chat_NameServiceDataReader_return_loan");
/* Start the sleeper thread. */
pthread_attr_init(&tattr);
pthread_attr_setdetachstate(&tattr, PTHREAD_CREATE_DETACHED);
pthread_create (&tid, &tattr, delayedEscape, NULL);
pthread_attr_destroy(&tattr);
while (!closed) {
/* Wait until at least one of the Conditions in the waitset triggers. */
status = DDS_WaitSet_wait(userLoadWS, guardList, &timeout);
checkStatus(status, "DDS_WaitSet_wait");
/* Walk over all guards to display information */
for (i = 0; i < guardList->_length; i++) {
guard = guardList->_buffer[i];
if (guard == newUser) {
/* The newUser ReadCondition contains data */
status = Chat_NameServiceDataReader_read_w_condition(
nameServer,
&nsList,
&infoSeq,
DDS_LENGTH_UNLIMITED,
newUser);
checkStatus(status, "Chat_NameServiceDataReader_read_w_condition");
for (j = 0; j < nsList._length; j++) {
printf ("New user: %s\n", nsList._buffer[j].name);
}
status = Chat_NameServiceDataReader_return_loan(nameServer, &nsList, &infoSeq);
checkStatus(status, "Chat_NameServiceDataReader_return_loan");
} else if (guard == leftUser) {
/* Some liveliness has changed (either a DataWriter joined or a DataWriter left) */
status = DDS_DataReader_get_liveliness_changed_status(loadAdmin, &livChangStatus);
checkStatus(status, "DDS_DataReader_get_liveliness_changed_status");
if (livChangStatus.alive_count < prevCount) {
/* A user has left the ChatRoom, since a DataWriter lost its liveliness */
/* Take the effected users so tey will not appear in the list later on. */
status = Chat_NameServiceDataReader_take(
nameServer,
&nsList,
&infoSeq,
DDS_LENGTH_UNLIMITED,
DDS_ANY_SAMPLE_STATE,
DDS_ANY_VIEW_STATE,
DDS_NOT_ALIVE_NO_WRITERS_INSTANCE_STATE);
checkStatus(status, "Chat_NameServiceDataReader_take");
for (j = 0; j < nsList._length; j++) {
/* re-apply query arguments */
sprintf(args._buffer[0], "%d", nsList._buffer[j].userID);
status = DDS_QueryCondition_set_query_parameters(singleUser, &args);
checkStatus(status, "DDS_QueryCondition_set_query_parameters");
/* Read this users history */
status = Chat_ChatMessageDataReader_take_w_condition(
loadAdmin,
&msgList,
&infoSeq2,
DDS_LENGTH_UNLIMITED,
singleUser);
checkStatus(status, "Chat_ChatMessageDataReader_take_w_condition");
/* Display the user and his history */
printf (
"Departed user %s has sent %d messages\n",
nsList._buffer[j].name,
msgList._length);
status = Chat_ChatMessageDataReader_return_loan(loadAdmin, &msgList, &infoSeq2);
checkStatus(status, "Chat_ChatMessageDataReader_return_loan");
}
status = Chat_NameServiceDataReader_return_loan(nameServer, &nsList, &infoSeq);
checkStatus(status, "Chat_NameServiceDataReader_return_loan");
}
prevCount = livChangStatus.alive_count;
} else if (guard == escape) {
printf ("UserLoad has terminated.\n");
closed = 1;
}
else
{
assert(0);
};
} /* for */
} /* while (!closed) */
/* Remove all Conditions from the WaitSet. */
status = DDS_WaitSet_detach_condition(userLoadWS, escape);
checkStatus(status, "DDS_WaitSet_detach_condition (escape)");
status = DDS_WaitSet_detach_condition(userLoadWS, leftUser);
checkStatus(status, "DDS_WaitSet_detach_condition (leftUser)");
status = DDS_WaitSet_detach_condition(userLoadWS, newUser);
checkStatus(status, "DDS_WaitSet_detach_condition (newUser)");
/* Free all resources */
DDS_free(guardList);
DDS_free(args._buffer);
DDS_free(userLoadWS);
DDS_free(escape);
DDS_free(setting_topic_qos);
DDS_free(reliable_topic_qos);
DDS_free(nameServiceTypeName);
DDS_free(chatMessageTypeName);
DDS_free(nameServiceTS);
DDS_free(chatMessageTS);
status = DDS_DomainParticipant_delete_contained_entities(participant);
checkStatus(status, "DDS_DomainParticipant_delete_contained_entities");
status = DDS_DomainParticipantFactory_delete_participant(
DDS_TheParticipantFactory,
participant);
checkStatus(status, "DDS_DomainParticipantFactory_delete_participant");
return 0;
}
static int subscriber_main(int domainId, int sample_count)
{
DDS_DomainParticipant *participant = NULL;
DDS_Subscriber *subscriber = NULL;
DDS_Topic *topic = NULL;
DDS_DataReader *reader = NULL;
DDS_ReturnCode_t retcode;
const char *type_name = NULL;
int count = 0;
struct DDS_Duration_t wait_timeout = {1,0};
/* Additional variables for this example */
int i;
DDS_WaitSet *waitset = NULL;
DDS_QueryCondition* query_condition = NULL;
waitset_query_condDataReader *waitset_query_cond_reader = NULL;
const char* query_expression = DDS_String_dup("name MATCH %0");
struct DDS_StringSeq query_parameters;
struct DDS_ConditionSeq active_conditions_seq =
DDS_SEQUENCE_INITIALIZER;
struct waitset_query_condSeq data_seq = DDS_SEQUENCE_INITIALIZER;
struct DDS_SampleInfoSeq info_seq = DDS_SEQUENCE_INITIALIZER;
/* Auxiliary variables */
char * odd_string = DDS_String_dup("'ODD'");
char * even_string = DDS_String_dup("'EVEN'");
/* The initial value of the param_list is EVEN string */
const char* param_list[] = {even_string};
/* To customize participant QoS, use
the configuration file USER_QOS_PROFILES.xml */
participant = DDS_DomainParticipantFactory_create_participant(
DDS_TheParticipantFactory, domainId, &DDS_PARTICIPANT_QOS_DEFAULT,
NULL /* listener */, DDS_STATUS_MASK_NONE);
if (participant == NULL) {
printf("create_participant error\n");
subscriber_shutdown(participant);
return -1;
}
/* To customize subscriber QoS, use
the configuration file USER_QOS_PROFILES.xml */
subscriber = DDS_DomainParticipant_create_subscriber(
participant, &DDS_SUBSCRIBER_QOS_DEFAULT, NULL /* listener */,
DDS_STATUS_MASK_NONE);
if (subscriber == NULL) {
printf("create_subscriber error\n");
subscriber_shutdown(participant);
return -1;
}
/* Register the type before creating the topic */
type_name = waitset_query_condTypeSupport_get_type_name();
retcode = waitset_query_condTypeSupport_register_type(participant,
type_name);
if (retcode != DDS_RETCODE_OK) {
printf("register_type error %d\n", retcode);
subscriber_shutdown(participant);
return -1;
}
/* To customize topic QoS, use
the configuration file USER_QOS_PROFILES.xml */
topic = DDS_DomainParticipant_create_topic(
participant, "Example waitset_query_cond",
type_name, &DDS_TOPIC_QOS_DEFAULT, NULL /* listener */,
DDS_STATUS_MASK_NONE);
if (topic == NULL) {
printf("create_topic error\n");
subscriber_shutdown(participant);
return -1;
}
/* To customize data reader QoS, use
the configuration file USER_QOS_PROFILES.xml */
reader = DDS_Subscriber_create_datareader(
subscriber, DDS_Topic_as_topicdescription(topic),
&DDS_DATAREADER_QOS_DEFAULT, NULL, DDS_STATUS_MASK_NONE);
if (reader == NULL) {
printf("create_datareader error\n");
subscriber_shutdown(participant);
return -1;
}
/* Narrow the reader into your specific data type */
waitset_query_cond_reader = waitset_query_condDataReader_narrow(reader);
if (waitset_query_cond_reader == NULL) {
printf("DataReader narrow error\n");
return -1;
}
/* Create query condition */
DDS_StringSeq_initialize(&query_parameters);
DDS_StringSeq_set_maximum(&query_parameters, 1);
/*Here we set the default filter using the param_list */
DDS_StringSeq_from_array(&query_parameters, param_list, 1);
query_condition = DDS_DataReader_create_querycondition(
reader,
DDS_NOT_READ_SAMPLE_STATE,
DDS_ANY_VIEW_STATE,
DDS_ANY_INSTANCE_STATE,
query_expression,
&query_parameters);
if (query_condition == NULL) {
printf("create_query_condition error\n");
subscriber_shutdown(participant);
return -1;
}
waitset = DDS_WaitSet_new();
if (waitset == NULL) {
printf("create waitset error\n");
subscriber_shutdown(participant);
return -1;
}
/* Attach Query Conditions */
retcode = DDS_WaitSet_attach_condition(waitset,
(DDS_Condition*)query_condition);
if (retcode != DDS_RETCODE_OK) {
printf("attach_condition error\n");
subscriber_shutdown(participant);
return -1;
}
printf ("\n>>>Timeout: %.0d sec & %d nanosec\n",wait_timeout.sec,
wait_timeout.nanosec);
printf (">>> Query conditions: name MATCH %%0\n");
printf ("\t%%0 = %s\n", param_list[0]);
printf ("---------------------------------\n\n");
/* Main loop */
for (count=0; (sample_count == 0) || (count < sample_count); ++count) {
/* We set a new parameter in the Query Condition after 7 secs */
if (count == 7) {
param_list[0] = odd_string;
printf ("CHANGING THE QUERY CONDITION\n");
printf ("\n>>> Query conditions: name MATCH %%0\n");
printf ("\t%%0 = %s\n", param_list[0]);
printf (">>> We keep one sample in the history\n");
printf ("-------------------------------------\n\n");
DDS_StringSeq_from_array(&query_parameters, param_list, 1);
DDS_QueryCondition_set_query_parameters(query_condition,
&query_parameters);
}
/* wait() blocks execution of the thread until one or more attached
* Conditions become true, or until a user-specified timeout expires.
*/
retcode = DDS_WaitSet_wait(
waitset, /* waitset */
&active_conditions_seq, /* active conditions sequence */
&wait_timeout); /* timeout */
/* We get to timeout if no conditions were triggered */
if (retcode == DDS_RETCODE_TIMEOUT) {
printf("Wait timed out!! No conditions were triggered.\n");
continue;
} else if (retcode != DDS_RETCODE_OK) {
printf("wait returned error: %d", retcode);
break;
}
retcode = DDS_RETCODE_OK;
while (retcode != DDS_RETCODE_NO_DATA) {
retcode =
waitset_query_condDataReader_take_w_condition(
waitset_query_cond_reader, &data_seq, &info_seq,
DDS_LENGTH_UNLIMITED,
DDS_QueryCondition_as_readcondition(query_condition));
for (i = 0; i < waitset_query_condSeq_get_length(&data_seq);
++i) {
if (!DDS_SampleInfoSeq_get_reference(
&info_seq, i)->valid_data) {
printf("Got metadata\n");
continue;
}
waitset_query_condTypeSupport_print_data(
waitset_query_condSeq_get_reference(&data_seq, i));
}
waitset_query_condDataReader_return_loan(
waitset_query_cond_reader, &data_seq, &info_seq);
}
}
/* Cleanup and delete all entities */
return subscriber_shutdown(participant);
}
DDS_MultiTopic
DDS_DomainParticipant_create_simulated_multitopic (
DDS_DomainParticipant participant,
const DDS_char *name,
const DDS_char *type_name,
const DDS_char *subscription_expression,
const DDS_StringSeq *expression_parameters )
{
/* Type-specific DDS entities */
static Chat_ChatMessageDataReader chatMessageDR;
static Chat_NameServiceDataReader nameServiceDR;
static Chat_NamedMessageDataWriter namedMessageDW;
/* Query related stuff */
static DDS_QueryCondition nameFinder;
static DDS_StringSeq *nameFinderParams;
/* QosPolicy holders */
DDS_TopicQos *namedMessageQos;
DDS_SubscriberQos *sub_qos;
DDS_PublisherQos *pub_qos;
/* Others */
const char *partitionName = "ChatRoom";
const char *nameFinderExpr;
struct MsgListenerState *listener_state;
DDS_Duration_t infiniteTimeOut = DDS_DURATION_INFINITE;
DDS_ReturnCode_t status;
/* Lookup both components that constitute the multi-topic. */
chatMessageTopic = DDS_DomainParticipant_find_topic(
participant,
"Chat_ChatMessage",
&infiniteTimeOut);
checkHandle(chatMessageTopic, "DDS_DomainParticipant_find_topic (Chat_ChatMessage)");
nameServiceTopic = DDS_DomainParticipant_find_topic(
participant,
"Chat_NameService",
&infiniteTimeOut);
checkHandle(nameServiceTopic, "DDS_DomainParticipant_find_topic (Chat_NameService)");
/* Create a ContentFilteredTopic to filter out our own ChatMessages. */
filteredMessageTopic = DDS_DomainParticipant_create_contentfilteredtopic(
participant,
"Chat_FilteredMessage",
chatMessageTopic,
"userID <> %0",
expression_parameters);
checkHandle(filteredMessageTopic, "DDS_DomainParticipant_create_contentfilteredtopic");
/* Adapt the default SubscriberQos to read from the "ChatRoom" Partition. */
sub_qos = DDS_SubscriberQos__alloc();
checkHandle(sub_qos, "DDS_SubscriberQos__alloc");
status = DDS_DomainParticipant_get_default_subscriber_qos (participant, sub_qos);
checkStatus(status, "DDS_DomainParticipant_get_default_subscriber_qos");
sub_qos->partition.name._length = 1;
sub_qos->partition.name._maximum = 1;
sub_qos->partition.name._buffer = DDS_StringSeq_allocbuf (1);
checkHandle(sub_qos->partition.name._buffer, "DDS_StringSeq_allocbuf");
sub_qos->partition.name._buffer[0] = DDS_string_alloc ( strlen(partitionName) );
checkHandle(sub_qos->partition.name._buffer[0], "DDS_string_alloc");
strcpy (sub_qos->partition.name._buffer[0], partitionName);
/* Create a private Subscriber for the multitopic simulator. */
multiSub = DDS_DomainParticipant_create_subscriber(participant, sub_qos, NULL, DDS_STATUS_MASK_NONE);
checkHandle(multiSub, "DDS_DomainParticipant_create_subscriber (for multitopic)");
/* Create a DataReader for the FilteredMessage Topic (using the appropriate QoS). */
chatMessageDR = DDS_Subscriber_create_datareader(
multiSub,
filteredMessageTopic,
DDS_DATAREADER_QOS_USE_TOPIC_QOS,
NULL,
DDS_STATUS_MASK_NONE);
checkHandle(chatMessageDR, "DDS_Subscriber_create_datareader (ChatMessage)");
/* Create a DataReader for the nameService Topic (using the appropriate QoS). */
nameServiceDR = DDS_Subscriber_create_datareader(
multiSub,
nameServiceTopic,
DDS_DATAREADER_QOS_USE_TOPIC_QOS,
NULL,
DDS_STATUS_MASK_NONE);
checkHandle(nameServiceDR, "DDS_Subscriber_create_datareader (NameService)");
/* Define the SQL expression (using a parameterized value). */
nameFinderExpr = "userID = %0";
/* Allocate and assign the query parameters. */
nameFinderParams = DDS_StringSeq__alloc();
checkHandle(nameFinderParams, "DDS_StringSeq__alloc");
nameFinderParams->_length = 1;
nameFinderParams->_maximum = 1;
nameFinderParams->_buffer = DDS_StringSeq_allocbuf (1);
checkHandle(nameFinderParams->_buffer, "DDS_StringSeq_allocbuf");
nameFinderParams->_buffer[0] = DDS_string_alloc ( MAX_INT_LENGTH );
checkHandle(nameFinderParams->_buffer[0], "DDS_string_alloc");
strcpy(nameFinderParams->_buffer[0], "0");
DDS_sequence_set_release(nameFinderParams, TRUE);
/* Create a QueryCondition to only read corresponding nameService information by key-value. */
nameFinder = DDS_DataReader_create_querycondition(
nameServiceDR,
DDS_ANY_SAMPLE_STATE,
DDS_ANY_VIEW_STATE,
DDS_ANY_INSTANCE_STATE,
nameFinderExpr,
nameFinderParams);
checkHandle(nameFinder, "DDS_DataReader_create_querycondition (nameFinder)");
/* Create the Topic that simulates the multi-topic (use Qos from chatMessage).*/
namedMessageQos = DDS_TopicQos__alloc();
checkHandle(namedMessageQos, "DDS_TopicQos__alloc");
status = DDS_Topic_get_qos(chatMessageTopic, namedMessageQos);
checkStatus(status, "DDS_Topic_get_qos");
/* Create the NamedMessage Topic whose samples simulate the MultiTopic */
namedMessageTopic = DDS_DomainParticipant_create_topic(
participant,
"Chat_NamedMessage",
type_name,
namedMessageQos,
NULL,
DDS_STATUS_MASK_NONE);
checkHandle(namedMessageTopic, "DDS_DomainParticipant_create_topic (NamedMessage)");
/* Adapt the default PublisherQos to write into the "ChatRoom" Partition. */
pub_qos = DDS_PublisherQos__alloc();
checkHandle(pub_qos, "DDS_PublisherQos__alloc");
status = DDS_DomainParticipant_get_default_publisher_qos (participant, pub_qos);
checkStatus(status, "DDS_DomainParticipant_get_default_publisher_qos");
pub_qos->partition.name._length = 1;
pub_qos->partition.name._maximum = 1;
pub_qos->partition.name._buffer = DDS_StringSeq_allocbuf (1);
checkHandle(pub_qos->partition.name._buffer, "DDS_StringSeq_allocbuf");
pub_qos->partition.name._buffer[0] = DDS_string_alloc ( strlen(partitionName) );
checkHandle(pub_qos->partition.name._buffer[0], "DDS_string_alloc");
strcpy (pub_qos->partition.name._buffer[0], partitionName);
/* Create a private Publisher for the multitopic simulator. */
multiPub = DDS_DomainParticipant_create_publisher(participant, pub_qos, NULL, DDS_STATUS_MASK_NONE);
checkHandle(multiPub, "DDS_DomainParticipant_create_publisher (for multitopic)");
/* Create a DataWriter for the multitopic. */
namedMessageDW = DDS_Publisher_create_datawriter(
multiPub,
namedMessageTopic,
DDS_DATAWRITER_QOS_USE_TOPIC_QOS,
NULL,
DDS_STATUS_MASK_NONE);
checkHandle(namedMessageDW, "DDS_Publisher_create_datawriter (NamedMessage)");
/* Allocate the DataReaderListener interface. */
msgListener = DDS_DataReaderListener__alloc();
checkHandle(msgListener, "DDS_DataReaderListener__alloc");
/* Fill the listener_data with pointers to all entities needed by the Listener implementation. */
listener_state = malloc(sizeof(struct MsgListenerState));
checkHandle(listener_state, "malloc");
listener_state->chatMessageDR = chatMessageDR;
listener_state->nameServiceDR = nameServiceDR;
listener_state->namedMessageDW = namedMessageDW;
listener_state->nameFinder = nameFinder;
listener_state->nameFinderParams = nameFinderParams;
msgListener->listener_data = listener_state;
/* Assign the function pointer attributes to their implementation functions. */
msgListener->on_data_available = (void (*)(void *, DDS_DataReader)) on_message_available;
msgListener->on_requested_deadline_missed = NULL;
msgListener->on_requested_incompatible_qos = NULL;
msgListener->on_sample_rejected = NULL;
msgListener->on_liveliness_changed = NULL;
msgListener->on_subscription_matched = NULL;
msgListener->on_sample_lost = NULL;
/* Attach the DataReaderListener to the DataReader, only enabling the data_available event. */
status = DDS_DataReader_set_listener(chatMessageDR, msgListener, DDS_DATA_AVAILABLE_STATUS);
checkStatus(status, "DDS_DataReader_set_listener");
/* Free up all resources that are no longer needed. */
DDS_free(namedMessageQos);
DDS_free(sub_qos);
DDS_free(pub_qos);
/* Return the simulated Multitopic. */
return namedMessageTopic;
}