inline
void
OpenDDS::Model::Service< ModelName, InstanceTraits>::createTopicDescription(
typename Participants::Values participant,
typename Topics::Values topic
)
{
typename ContentFilteredTopics::Values cfTopic =
this->modelData_.contentFilteredTopic(topic);
typename MultiTopics::Values multiTopic =
this->modelData_.multiTopic(topic);
// If this is a content-filtered topic
if (cfTopic != ContentFilteredTopics::LAST_INDEX) {
createContentFilteredTopic(participant, topic, cfTopic);
// Else if this is a multitopic
} else if (multiTopic != MultiTopics::LAST_INDEX) {
createMultiTopic(participant, topic, multiTopic);
// Else this is a standard topic
} else {
createTopic(participant, topic);
}
}
int main(int argc, char *argv[])
{
char* partition_name = "ContentFilteredTopic example";
DDS_Subscriber contentFilteredTopicDataSubscriber;
DDS_DataReader contentFilteredTopicDataDataReader;
ContentFilteredTopicData_Stock* contentFilteredTopicDataSample;
DDS_InstanceHandle_t userHandle;
DDS_sequence_ContentFilteredTopicData_Stock* msgList = DDS_sequence_ContentFilteredTopicData_Stock__alloc();
DDS_SampleInfoSeq* infoSeq = DDS_SampleInfoSeq__alloc();
c_bool isClosed = FALSE;
unsigned long j, userInput, timeOut;
const char *filterValueToSubscribe;
DDS_char* contentFilteredStockTopicName = "MyStockTopic";
DDS_ContentFilteredTopic contentFilteredTopic;
int filter_expressionLength;
const char* filter_expressionPrefix = "ticker = '";
const char* filter_expressionSuffix = "'";
DDS_char *filter_expression;
const DDS_StringSeq* filter_parameters = DDS_StringSeq__alloc();
os_time delay_200ms = { 0, 200000000 };
int count = 0;
// usage : ContentFilteredTopicDataSubscriber <topic's content filtering string>
if( argc < 2 )
{
usage();
}
printf("=== ContentFilteredTopicDataSubscriber");
// Removed to comply with expected results
//printf("\n\n Parameter is \"%s\"", argv[1]);
filterValueToSubscribe = argv[1];
createParticipant( partition_name );
// Register Stock Topic's type in the DDS Domain.
g_StockTypeSupport = (DDS_TypeSupport) ContentFilteredTopicData_StockTypeSupport__alloc();
checkHandle(g_StockTypeSupport, "ContentFilteredTopicData_StockTypeSupport__alloc");
registerStockType(g_StockTypeSupport);
// Create Stock Topic in the DDS Domain.
g_StockTypeName = (char*) ContentFilteredTopicData_StockTypeSupport_get_type_name(g_StockTypeSupport);
g_StockTopic = createTopic("StockTrackerExclusive", g_StockTypeName);
DDS_free(g_StockTypeName);
DDS_free(g_StockTypeSupport);
// Create the Subscriber's in the DDS Domain.
contentFilteredTopicDataSubscriber = createSubscriber();
// create subscription filter
filter_expressionLength = strlen(filter_expressionPrefix);
filter_expressionLength += strlen(filterValueToSubscribe);
filter_expressionLength += strlen(filter_expressionSuffix);
filter_expression = DDS_string_alloc(filter_expressionLength);
snprintf(filter_expression, filter_expressionLength + 1, "%s%s%s", filter_expressionPrefix, filterValueToSubscribe, filter_expressionSuffix);
// create ContentFilteredTopic to retrieve only the samples with the given Stock.
contentFilteredTopic = createContentFilteredTopic(contentFilteredStockTopicName, g_StockTopic, filter_expression, filter_parameters);
// create Filtered DataReader
printf( "\n=== [ContentFilteredTopicDataSubscriber] Subscription filter : %s", filter_expression );
// Request a Reader from the the Subscriber.
contentFilteredTopicDataDataReader = createContentFilteredDataReader(contentFilteredTopicDataSubscriber, contentFilteredTopic);
printf( "\n=== [ContentFilteredTopicDataSubscriber] Ready ..." );
do
{
g_status = ContentFilteredTopicData_StockDataReader_take(contentFilteredTopicDataDataReader, msgList, infoSeq, DDS_LENGTH_UNLIMITED, DDS_ANY_SAMPLE_STATE, DDS_ANY_VIEW_STATE, DDS_ANY_INSTANCE_STATE);
checkStatus(g_status, "ContentFilteredTopicData_StockDataReaderView_take");
if( msgList->_length > 0 )
{
j = 0;
do
{
contentFilteredTopicDataSample = &msgList->_buffer[j];
if( infoSeq->_buffer[j].valid_data )
{
if( contentFilteredTopicDataSample->price != (DDS_float) -1.0f )
{
int floatWidth = ( ((DDS_float) contentFilteredTopicDataSample->price) - ((long) contentFilteredTopicDataSample->price) ) ? 1 : 0;
printf("\n=== [ContentFilteredTopicDataSubscriber] receives stockQuote : (%s, %.*f)", contentFilteredTopicDataSample->ticker, floatWidth, contentFilteredTopicDataSample->price);
}
else
{
isClosed = TRUE;
}
}
}
while( ++j < msgList->_length );
g_status = ContentFilteredTopicData_StockDataReader_return_loan(contentFilteredTopicDataDataReader, msgList, infoSeq);
checkStatus(g_status, "ContentFilteredTopicData_StockDataReader_return_loan");
if(isClosed == FALSE)
{
os_nanoSleep(delay_200ms);
++count;
}
}
}
while( isClosed == FALSE && count < 1500); // We dont want the example to run indefinitely
printf("\n=== [ContentFilteredTopicDataSubscriber] Market Closed\n");
// Cleanup DDS from the created Entities.
deleteDataReader(contentFilteredTopicDataSubscriber, contentFilteredTopicDataDataReader);
deleteSubscriber(contentFilteredTopicDataSubscriber);
deleteContentFilteredTopic(contentFilteredTopic);
deleteTopic(g_StockTopic);
deleteParticipant();
// Cleanup C allocations,
// recursively freeing the allocated structures and sequences using the OpenSplice API.
DDS__free(msgList);
DDS__free(infoSeq);
// Print out an empty line, just to let behind a clean new line for the shell..
// Removed to comply with expected results
//printf("\n\r");
return 0;
}
