Basic understanding of the system, the components and the roles they play.
JWire Concepts AComposite foo : Foobar : Bar Components are Java objects. Components play roles in...
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Transcript of JWire Concepts AComposite foo : Foobar : Bar Components are Java objects. Components play roles in...
JWire Concepts
AComposite
foo : Foo bar : Bar
Components are Java objects.
Components play roles in one or more interaction protocols. Roles are named and typed.
out : Requirement<Input>
in : Input
Systems are created by instantiating components and “wiring” their roles together. New component types can
be defined as compositions of existing components.
Meta-level Descriptors
adaptiondescrip tor
b ind ingdescrip tor
com ponentdescrip tor
com ponentdescrip tor
ro ledescrip tors
Impl
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Descriptors are per instance not per class (c.f. Java Beans)
Composition “Recipes”
• To place components, ALAN run-time must know their resource requirements.
• How?– Add this information to the descriptors
• Create descriptors first:– Descriptors encapsulate how to create
components and bind them– Act as “recipes” for a configuration
What For?
• Automatic creation of distributed app’s– User’s applications generates recipes
• E.g. for searching, purchasing, negotiating, etc.
– Pass recipe to ALAN services– ALAN deploys components in optimal
locations around network
• Mobile agents “done right”– Concurrency, distribution, efficiency