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.

1.0: OPCProducer works perfectly. Now it connects to an OPC-DA server, listen to trigger changes and report the state of a group of items to a BlockingQueue. To use it:

• 1 implements IOPCCotext to match your needs (see MatrikonSimContext to get inspired). Let's call it MyOPCContext
• 2 Follow this snippet:

   private BlockingQueue<IOPCMessage> queue = new ArrayBlockingQueue<IOPCMessage>(QUEUE_LIMIT);
   private OPCProducer producer;
   producer = new OPCProducer(new MyOPCContext(), queue);
   // listen to queue to get some OPCMessageGroup

  Known bugs:

• bug 5 sometimes OPC server reconnection fail.

Initial Import.

• OPCProducer: produce OPCMessage objects listening to OPC-DA server changes. Configuration in made of a context where are define groups and triggers. When a trigger change all group items are read and send to a blocking queue.

• ConnectionInformationFactory: build a JIInterop ConnectionInformation starting from a context object

• OPCMessageAdapter: adapt an JIInterop object to a simple serializable POJO. This class is tested

What comes next.

In the next releases will be

• test OPCProducer using as source a local hosted Matrikon OPC Server and evaluating messages put into the Blocking Queue.
• develop OPCConsumer to write OPC items reading requests from a Blocking Queue
• test OPCConsumer using as destination a local hosted Matrikon OPC Server
• develop JMSConsumer that read messages from a Blocking Queue and send them to a JMS queue
• test JMSConsumer
• develop JMSProducer that listen to a JMS queue and send write requestes to a Blocking Queue
• test JMSProducer