Glossary

event

See Event.

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 as DOM tree

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 type s for a list of well-known wire schema <-> data type mappings.

local server

A kind of participant which provides methods that can be called by other participant s.

See also remote server.

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

participant

Any entity that communicates via the bus is called a participant. Typical participants are listener s which receive event s and informer s which publish event s.

listener

A kind of participant which (asynchronously) receives event s.

reader

A kind of participant which synchronously receives event s.

See also listener.

remote server

A kind of participant which is able to call methods provided by local server s.

See also local server.

informer

A kind of participant which publishes event s.

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]+/)*

channel

A communication domain participants of which exchange events in a broadcast communication style. Channels form a tree with respect to set-inclusion relations of their respective sets of participants. Channels are designated by scopes.

transport

TODO

Spread

The Spread group communication framework is one the transport s RSB can use.

Spread daemon

A network server used by Spread to coordinate communication of clients and exchange data. Usually installed under the name PREFIX/sbin/spread.