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rpcServiceExample.cpp: more robust, up-to-date code

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This commit is contained in:
Matej Sekoranja
2014-06-04 09:18:48 +02:00
parent 030951c7f1
commit 658d73d868
1 changed files with 32 additions and 19 deletions
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51
testApp/remote/rpcServiceExample.cpp
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@@ -10,33 +10,46 @@
using namespace epics::pvData;
using namespace epics::pvAccess;
static StructureConstPtr createResultField()
{
FieldCreatePtr fieldCreate = getFieldCreate();
StringArray fieldNames;
fieldNames.push_back("c");
FieldConstPtrArray fields;
fields.push_back(fieldCreate->createScalar(pvDouble));
return fieldCreate->createStructure(fieldNames, fields);
}
static StructureConstPtr resultStructure = createResultField();
static Structure::const_shared_pointer resultStructure =
getFieldCreate()->createFieldBuilder()->
add("c", pvDouble)->
createStructure();
class SumServiceImpl :
public RPCService
{
PVStructure::shared_pointer request(PVStructure::shared_pointer const & args)
PVStructure::shared_pointer request(PVStructure::shared_pointer const & pvArguments)
throw (RPCRequestException)
{
// TODO error handling
double a = atof(args->getStringField("a")->get().c_str());
double b = atof(args->getStringField("b")->get().c_str());
// NTURI support
PVStructure::shared_pointer args(
(pvArguments->getStructure()->getID() == "uri:ev4:nt/2012/pwd:NTURI") ?
pvArguments->getStructureField("query") :
pvArguments
);
// get fields and check their existence
PVScalar::shared_pointer af = args->getSubField<PVScalar>("a");
PVScalar::shared_pointer bf = args->getSubField<PVScalar>("b");
if (!af || !bf)
throw RPCRequestException(Status::STATUSTYPE_ERROR, "scalar 'a' and 'b' fields are required");
// get the numbers (and convert if neccessary)
double a, b;
try
{
a = af->getAs<double>();
b = bf->getAs<double>();
}
catch (std::exception &e)
{
throw RPCRequestException(Status::STATUSTYPE_ERROR,
std::string("failed to convert arguments to double: ") + e.what());
}
// create return structure and set data
PVStructure::shared_pointer result = getPVDataCreate()->createPVStructure(resultStructure);
result->getDoubleField("c")->put(a+b);
result->getSubField<PVDouble>("c")->put(a+b);
return result;
}
};