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[src/app-framework-binder.git] / old-docs / afb-daemon-vocabulary.md

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+Vocabulary for AFB-DAEMON
+=========================
+
+## Binding
+
+A shared library object intended to add a functionality to an afb-daemon
+instance. It implements an API and may provide a service.
+
+Binding made for services can have specific entry point called after
+initialisation and before serving.
+
+## Event
+
+Message with data propagated from the services to the client and not expecting
+any reply.
+
+The current implementation allows to widely broadcast events to all clients.
+
+## Level of assurance (LOA)
+
+This level that can be from 0 to 3 represent the level of
+assurance that the services can expect from the session.
+
+The exact definition of the meaning of these levels and how to use it remains to
+be achieved.
+
+## Plugin
+
+Old name for binding, see binding.
+
+## Request
+
+A request is an invocation by a client to a binding method using a message
+transferred through some protocol: HTTP, WebSocket, DBUS... and served by
+***afb-daemon***
+
+## Reply/Response
+
+This is a message sent to client as the result of the request.
+
+## Service
+
+Service are made of bindings running by their side on their binder.
+It can serve many client. Each one attached to one session.
+
+The framework establishes connection between the services and
+the clients. Using DBus currently but other protocols are considered.
+
+## Session
+
+A session is meant to be the unique instance context of a client,
+which identify that instance across requests.
+
+Each session has an identifier. Session identifier generated by afb-daemon are
+UUIDs.
+
+Internally, afb-daemon offers a mechanism to attach data to sessions.
+When the session is closed or disappears, the data attached to that session
+are freed.
+
+## Token
+
+The token is an identifier that the client must give to be authenticated.
+
+At start, afb-daemon get an initial token. This initial token must be presented
+by incoming client to be authenticated.
+
+A token is valid only for a period.
+
+The token must be renewed periodically. When the token is renewed, afb-daemon
+sends the new token to the client.
+
+Tokens generated by afb-daemon are UUIDs.
+
+## UUID
+
+It stand for Universal Unique IDentifier.
+
+It is designed to create identifier in a way that avoid has much as possible
+conflicts. It means that if two different instances create an UUID, the
+probability that they create the same UUID is very low, near to zero.
+
+## x-afb-reqid
+
+Argument name that can be used with HTTP request. When this argument is given,
+it is automatically added to the "request" object of the answer.
+
+## x-afb-token
+
+Argument name meant to give the token without ambiguity.
+You can also use the name **token** but it may conflicts with others arguments.
+
+## x-afb-uuid
+
+Argument name for giving explicitly the session identifier without ambiguity.
+You can also use the name **uuid** but it may conflicts with others arguments.
+