Messaging

Messaging relies on CORBA’s event structure as a transport structure. In CORBA’s event API, messages are passed as an Any type using the function push().

While CORBA manages marshaling and delivery of the data, it does not provide any mechanisms inherent to events to describe the contents of the Any type. REDHAWK decided to leverage an existing payload structure descriptor to describe the payload of messages, the properties Interface Description Language (IDL). The selection of this interface eliminates the need to create a new IDL describing messages. Furthermore, there is already an XML structure that is mapped to efficient binary data structures, allowing the use of XML to describe message contents while eliminating the need for introducing XML parsers in the message delivery mechanism.

To support this additional functionality, REDHAWK has expanded the properties descriptor to allow a property to have the kind message. The only property that can have a valid message kind is a structure.

• Message Producer
• Message Consumer
• Viewing Messages
• Connecting Producers and Consumers