====== 3rd Internal Meeting ======

2009 April 17

Present: Mark, Des, Dominik

  - The main objective of the meeting
    * internal discussion on communication protocols and behaviour of software modules
    * updates and changes in software modules
  - **Data in communication protocol**
    * the integer identifier for radio telescope, TN and correlator will NOT be a part of a protocol
    * each resource will be distinguished by service URL
    * the integer experimentId field will be changed to String jobId. This jobId value has to be added to the communication protocol. 
    * the jobId value is used differentiate data in case where the same experiment data is being correlated at the same time, but with different parameters
  - **Translation Node related issues**
    * there was a discussion on how to distinguish chunks from different TNs
      * each chunk has its own identifier (long)
      * we agreed that if chunks from different TN have the same identifiers we can treat them as corresponding chunks and correlate them 
        * it is TN job to make sure that chunks receive proper identifiers  
  - **Confirmation messages**
    * the communication pattern between Broker and TN will be changed as follows:
      * all messages are asynchronous
      * Broker sends startTranslationJob message to TN
      * TN decodes the message and sends back information to VLBI Broker with the status OK or ERROR
        * that operation should be added to the protocol [Dominik]
      * then TN sends notifications that new data chunks are ready
    * chunkCount should be added to ChunkInfo so Broker knows how many chunks will be sent by TN
      * Des needs to update the code to include that information
      * chunks are numbered starting form zero so N-1 of N is a termination condition
  - **Monitoring - FUTURE WORK**
    * WFM presents list of active observation workflows
    * possibility to monitor workflow
    * possibility to stop workflow execution
    * we agreed to implement that in EXPReS 2
  - **Action items**
    * make all the changes and generate new WSDL file by April 24th [Dominik] **[DONE]** 
      * **all the changes has been incorporated** 
      * **new WSDL files have been generated for all services, see page [[expres:fabric:evlbisystem:communicationprotocol| Communication Protocol]]**
    * update all services and deploy them on Huygens by April 24th  [Dominik]
    * update TN service by April ?? [Des]