本文整理汇总了C++中DataReader_var::create_querycondition方法的典型用法代码示例。如果您正苦于以下问题：C++ DataReader_var::create_querycondition方法的具体用法？C++ DataReader_var::create_querycondition怎么用？C++ DataReader_var::create_querycondition使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类DataReader_var的用法示例。
在下文中一共展示了DataReader_var::create_querycondition方法的3个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: run_sorting_test
bool run_sorting_test(const DomainParticipant_var& dp,
const MessageTypeSupport_var& ts, const Publisher_var& pub,
const Subscriber_var& sub)
{
DataWriter_var dw;
DataReader_var dr;
test_setup(dp, ts, pub, sub, "MyTopic", dw, dr);
ReturnCode_t ret = RETCODE_OK;
MessageDataWriter_var mdw = MessageDataWriter::_narrow(dw);
Message sample;
sample.key = 0;
sample.name = "data_X";
sample.nest.value = B;
for (int i(0); i < 20; ++i, ++sample.key) {
//replace the 'X' with a random letter
sample.name.inout()[5] = static_cast<char>((rand() % 26) + 'A');
ret = mdw->write(sample, HANDLE_NIL);
if (ret != RETCODE_OK) return false;
if (!(i % 4)) { //once in a while write more than 1 sample per instance
Message sample2(sample);
sample2.nest.value = A;
sample2.name.inout()[5] = static_cast<char>((rand() % 26) + 'A');
ret = mdw->write(sample2, HANDLE_NIL);
if (ret != RETCODE_OK) return false;
sample2.nest.value = C;
ret = mdw->write(sample2, HANDLE_NIL);
if (ret != RETCODE_OK) return false;
}
}
DDS::StringSeq empty_query_params;
ReadCondition_var dr_qc = dr->create_querycondition(ANY_SAMPLE_STATE,
ANY_VIEW_STATE, ALIVE_INSTANCE_STATE, "ORDER BY name, nest.value",
empty_query_params);
WaitSet_var ws = new WaitSet;
ws->attach_condition(dr_qc);
MessageDataReader_var mdr = MessageDataReader::_narrow(dr);
Duration_t five_seconds = {5, 0};
bool passed = true, done = false;
while (!done) {
ConditionSeq active;
ret = ws->wait(active, five_seconds);
if (ret == RETCODE_TIMEOUT) {
cout << "timeout ";
done = true; //continue to try and read
} else if (ret != RETCODE_OK) {
passed = false;
break;
}
cout << "wait returned" << endl;
MessageSeq data;
SampleInfoSeq info;
ret = mdr->take_w_condition(data, info, LENGTH_UNLIMITED, dr_qc);
if (ret == RETCODE_NO_DATA) {
// fall-through
} else if (ret != RETCODE_OK) {
cout << "ERROR: take_w_condition returned " << ret << endl;
passed = false;
done = true;
} else {
char largest = 0;
for (CORBA::ULong i(0); i < data.length(); ++i) {
cout << "Info:\tinstance_handle = " << info[i].instance_handle <<
"\tsample_rank = " << info[i].sample_rank << '\n';
if (info[i].valid_data) {
cout << "Data:\tkey = " << data[i].key <<
" \tname = " << data[i].name <<
"\tnest.value = " << data[i].nest.value <<
'\n';
if (data[i].name[5] >= largest) {
largest = data[i].name[5];
} else {
cout << "ERROR: data is not sorted for key: " <<
data[i].key << endl;
passed = false;
}
}
cout << endl;
}
}
}
MessageSeq data;
SampleInfoSeq info;
ret = mdr->take_w_condition(data, info, LENGTH_UNLIMITED, dr_qc);
if (ret != RETCODE_NO_DATA) {
cout << "WARNING: there is still data in the reader\n";
}
ws->detach_condition(dr_qc);
dr->delete_readcondition(dr_qc);
return passed;
}示例2: run_filtering_test
bool run_filtering_test(const DomainParticipant_var& dp,
const MessageTypeSupport_var& ts, const Publisher_var& pub,
const Subscriber_var& sub)
{
DataWriter_var dw;
DataReader_var dr;
test_setup(dp, ts, pub, sub, "MyTopic2", dw, dr);
MessageDataWriter_var mdw = MessageDataWriter::_narrow(dw);
Message sample;
sample.key = 1;
ReturnCode_t ret = mdw->write(sample, HANDLE_NIL);
if (ret != RETCODE_OK) return false;
if (!waitForSample(dr)) return false;
ReadCondition_var dr_qc = dr->create_querycondition(ANY_SAMPLE_STATE,
ANY_VIEW_STATE, ALIVE_INSTANCE_STATE, "key > 1", DDS::StringSeq());
if (!dr_qc.in()) {
cout << "ERROR: failed to create QueryCondition" << endl;
return false;
}
WaitSet_var ws = new WaitSet;
ws->attach_condition(dr_qc);
ConditionSeq active;
Duration_t three_sec = {3, 0};
ret = ws->wait(active, three_sec);
// expect a timeout because the sample doesn't match the query string
if (ret != RETCODE_TIMEOUT) {
cout << "ERROR: wait(qc) should have timed out" << endl;
return false;
}
ws->detach_condition(dr_qc);
MessageDataReader_var mdr = MessageDataReader::_narrow(dr);
MessageSeq data;
SampleInfoSeq infoseq;
ret = mdr->take_w_condition(data, infoseq, LENGTH_UNLIMITED, dr_qc);
if (ret != RETCODE_NO_DATA) {
cout << "ERROR: take_w_condition(qc) shouldn't have returned data" << endl;
return false;
}
SampleInfo info;
if (mdr->take_next_sample(sample, info) != RETCODE_OK) {
cout << "ERROR: take_next_sample() should have returned data" << endl;
return false;
}
sample.key = 2;
if (mdw->write(sample, HANDLE_NIL) != RETCODE_OK) return false;
if (!waitForSample(dr)) return false;
ws->attach_condition(dr_qc);
ret = ws->wait(active, three_sec);
if (ret != RETCODE_OK) {
cout << "ERROR: wait(qc) should not time out" << endl;
return false;
}
ws->detach_condition(dr_qc);
ret = mdr->take_w_condition(data, infoseq, LENGTH_UNLIMITED, dr_qc);
if (ret != RETCODE_OK) {
cout << "ERROR: take_w_condition(qc) should have returned data" << endl;
return false;
}
dr->delete_readcondition(dr_qc);
return true;
}示例3: run_change_parameter_test
bool run_change_parameter_test(const DomainParticipant_var& dp,
const MessageTypeSupport_var& ts, const Publisher_var& pub,
const Subscriber_var& sub)
{
DataWriter_var dw;
DataReader_var dr;
test_setup(dp, ts, pub, sub, "MyTopic3", dw, dr);
MessageDataWriter_var mdw = MessageDataWriter::_narrow(dw);
Message sample;
sample.key = 3;
ReturnCode_t ret = mdw->write(sample, HANDLE_NIL);
if (ret != RETCODE_OK) return false;
if (!waitForSample(dr)) return false;
DDS::StringSeq params(1);
params.length(1);
params[0] = "2";
ReadCondition_var dr_qc = dr->create_querycondition(ANY_SAMPLE_STATE,
ANY_VIEW_STATE, ALIVE_INSTANCE_STATE, "key = %0", params);
if (!dr_qc.in()) {
cout << "ERROR: failed to create QueryCondition" << endl;
return false;
}
QueryCondition_var query_cond = QueryCondition::_narrow(dr_qc);
CORBA::String_var expr = query_cond->get_query_expression();
if (std::string("key = %0") != expr.in()) {
cout << "ERROR: get_query_expression() query expression should match " << endl;
return false;
}
params = DDS::StringSeq();
ret = query_cond->get_query_parameters(params);
if (ret != RETCODE_OK) {
cout << "ERROR: get_query_parameters() failed " << endl;
return false;
} else if (params.length() != 1 || std::string(params[0]) != "2") {
cout << "ERROR: get_query_parameters() query parameters doesn't match " << endl;
return false;
}
WaitSet_var ws = new WaitSet;
ws->attach_condition(dr_qc);
ConditionSeq active;
Duration_t three_sec = {3, 0};
ret = ws->wait(active, three_sec);
// expect a timeout because the sample doesn't match the query string
if (ret != RETCODE_TIMEOUT) {
cout << "ERROR: wait(qc) should have timed out" << endl;
return false;
}
ws->detach_condition(dr_qc);
MessageDataReader_var mdr = MessageDataReader::_narrow(dr);
MessageSeq data;
SampleInfoSeq infoseq;
ret = mdr->take_w_condition(data, infoseq, LENGTH_UNLIMITED, dr_qc);
if (ret != RETCODE_NO_DATA) {
cout << "ERROR: take_w_condition(qc) shouldn't have returned data" << endl;
return false;
}
params = DDS::StringSeq(1);
params.length(1);
params[0] = "3";
ret = query_cond->set_query_parameters(params);
params = DDS::StringSeq();
ret = query_cond->get_query_parameters(params);
if (ret != RETCODE_OK) {
cout << "ERROR: get_query_parameters() failed " << endl;
return false;
} else if (params.length() != 1 || std::string(params[0]) != "3") {
cout << "ERROR: get_query_parameters() query parameters doesn't match " << endl;
return false;
}
ws->attach_condition(dr_qc);
ret = ws->wait(active, three_sec);
if (ret != RETCODE_OK) {
cout << "ERROR: wait(qc) should not time out" << endl;
return false;
}
ws->detach_condition(dr_qc);
ret = mdr->take_w_condition(data, infoseq, LENGTH_UNLIMITED, dr_qc);
if (ret != RETCODE_OK) {
cout << "ERROR: take_w_condition(qc) should have returned data" << endl;
return false;
}
dr->delete_readcondition(dr_qc);
return true;
}