Glossary¶

• Glossary
  • • event payload
    • data type
    • wire type
    • wire schema
    • domain->wire converter
    • wire->domain converter
    • notification
    • scope

event payload¶

domain object (programming language dependent) that is associated with an event.

Example(C++,protocol buffers,spread): an object of type IplImage*

data type¶

the type (programming language dependent) of event payload.

Example(C++,protocol buffers,spread): IplImage* for the example above

wire type¶

Container type (programming language dependent?) of serialized representation of event payload (specific for a port type)

Examples

• C++,protocol buffers,spread: unsigned char*
• Java,xmpp: XMPP message

wire schema¶

Layout/structure of serialized representation of event payload

Example(C++,protocol buffers,spread): specified by ImageMessage protocol buffer descriptor

domain->wire converter¶

Mechanism that transforms event payloads into data of the wire type that has an interpretation w.r.t. the wire schema. Uniquely identified by the triple

1. domain type
2. wire type
3. wire schema

Example(C++,protocol buffers,spread): AbstractConverter<std::string>?

See Types for a list of well-known wire schema <-> data type mappings

wire->domain converter¶

Similar

notification¶

Transport-specific message that contains

• event meta-data
• wire schema
• (wire type, wire schema) representation of payload
  Note: does not contain domain type of event payload

scope¶

descriptor for a channel of the unified bus. The channel is itself hierarchical, hence the scope also reflects this structure. There is a string-based notation for scopes: /parent/sub/subsubscope/. A scope is valid if it matches the given regular expression: /([a-zA-Z0-9]+/)*