Software Connectors A Taxonomy Approach Nikunj Mehta USC-CSE Software Architectures Model run time structure of applications Describe the elements, form and rationale Used to analyze system properties Formal representation of elements Domain specific styles Limited modeling primitives Implementation decisions considered outside the scope 02/25/20 WESAS 2000 2 Components Or Connectors
Components Connectors Memory and Computation Interactions and protocols Domain dependent Domain independent Realize functional requirements Meet extra-functional properties Fairly well understood Mostly not well understood Original inhabitants
Second-class citizens Bugs Logic, optimization 02/25/20 WESAS 2000 System dynamism Middleware 3 Richer Connectors Role of connectors To mediate interactions among components To provide auxiliary mechanisms for interaction Large scale development does not adequately address issues of interaction
Simple and Complex connectors Procedure calls, module dependencies, pipes are simple DNS, remote procedure calls, repository access, concurrency and synchronization are complex Focus on connectors 02/25/20 component logic is essentially frozen early in life cycle connectors evolve to improve levels of service WESAS 2000 4 Classification Framework Atomic elements
Ducts, data transfer and control transfer Service categories Communication Coordination Conversion Facilitation Connector types, dimensions 02/25/20
Finitely many values WESAS 2000 5 02/25/20 WESAS 2000 6 Connector Composition Connectors have internal architecture Composed of simpler components and connectors Composition of interaction services for richer connectors
E.g. multi-way procedure call connectors Orthogonal and compatible connector dimensions OTS middleware for realizing rich connectors 02/25/20 Mappings to services in OMGs Object Management Architecture WESAS 2000 7 Future Work Connector taxonomy Evolution of connector dimensions and values
Architecture implementation framework Composition of arbitrarily complex connectors Architectural gauges and connector instrumentation Architecture based software evolution 02/25/20 Architectures for small-and-the-many systems Adaptability and efficiency tradeoffs WESAS 2000 8
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