OPCConsumer - develop and test - Githubissues

skioppetto / OPCtoJMS

a bridge from an OPC-DA server to a JMS queue. The target is to read realtimes changes from an OPC server and decouple elaboration

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OPCConsumer - develop and test #8

Open skioppetto opened 10 years ago

skioppetto commented 10 years ago

develop an OPCConsumer class. It will read OPCMessage objects from a queue and will write them to an OPC-DA server.

stp1. Develop an Adapter from JSON message to JIVariant object
stp2. Configuration needs to be integrated with the one used for OPCProducer.
stp3. First write item defined by getName() operation and getJsonValue() operation. The OPCMessage could include a list o items. In this case a second batch write operation is required.

skioppetto commented 10 years ago

stp1. see https://github.com/skioppetto/OPCtoJMS/wiki/Data-Representation Build a VariantMapper that maps from/to a simplified object OPCValue composed by value serialized with json and VT data type as string.

Variant->OPCValue calculate java data type and serialize the value (for data types see table). Get the variant dataType (int value), transform in String and populate variantType field
OPCValue->Variant look at variantType and try to convert value to JIVariant (could throw exception)