====== 03 Design Decisions ======

[[https://forums.ni.com/t5/Past-NIWeek-Sessions/TS9723-DQMH-Decisions-Behind-the-Design/ta-p/3316019|Presentation on Decisions Behind the Design]]

===== Queues vs Events =====
 
  * events = public (external)
  * queues = local (internal)
  * easier to debug

  * Advantages of events
    * broadcast
    * doesn't matter if there are listeners (1 or more) or not
      * one event queue per listener
      * no listener - no queue
    * events in same queue (1 event structure) can have different data types
    * errors are edit time
    * register/unregister at runtime


===== Strict Message Typing =====

  * hard to search strings
  * easy to find VIs
  * easy to show which VIs are available (API)


===== API Testers =====

  * test modules individually, outside application
  * can sniff messages (also in .exe)