Invocation Semantics for IDL Operations

• By default, IDL operations calls are synchronous; that is, a client calls an operation and blocks until the object has processed the operation call and returned a value.
• The IDL keyword oneway allows you to modify these invocation semantics.
• If you precede an operation definition with the keyword oneway, a client that calls the operation will not block while the object processes the call.¹

  For example, you could add a oneway operation to interface Account that sends a notice to an Account object, as follows:

  
      module Finance { 
        interface Account { 
          oneway void notice(in string text); 
          ... 
        }; 
      }; 
  

• Orbix does not guarantee that a oneway operation call will succeed; so if a oneway operation fails, a client may never know.
• There is only one circumstance in which Orbix indicates failure of a oneway operation. If a oneway operation call fails before Orbix transmits the call from the client address space, then Orbix raises a system exception.
• A oneway operation cannot have any out or inout parameters and cannot return a value.
• Nor can a oneway operation have an associated raises clause.