A Process Algebraic Approach to Software Architecture Design by Alessandro Aldini

By Alessandro Aldini

Concurrency conception, software program structure, process modeling and verification, and dependability and function overview could seem unrelated disciplines, yet actually they're deeply intertwined and will join an built-in view with the intention to effectively deal with the expanding complexity of software program structures today.

This booklet introduces a approach algebraic method of software program structure layout. procedure algebra, initially conceived for reasoning in regards to the semantics of concurrent courses, presents a foundational foundation for the modeling and verification of sensible and nonfunctional features of speaking concurrent platforms. this is often exploited on the software program structure point of layout to enhance the formality of layout files and make attainable the research of method homes on the early layout stages.

The first a part of the e-book deals an summary of the options and result of approach algebra conception delivering heritage fabric at the syntax and semantics for strategy calculi in addition to at the bisimulation, trying out, and hint ways to the definition of behavioral equivalences for nondeterministic, deterministically timed, and stochastically timed processes.

Part offers directions for a principled transformation of technique algebra into an architectural description language, ahead of demonstrating the best way to use approach algebraic thoughts to deal with the detection of architecture-level mismatches, performance-driven choice between substitute designs, and the success of a tradeoff among dependability good points and function indices.

Graduate scholars and software program pros, will discover a approach Algebraic method of software program structure layout an invaluable addition to their bookshelf.

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Extra resources for A Process Algebraic Approach to Software Architecture Design

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B) For each class split into a nonempty subclass of states reaching the selected splitter and a nonempty subclass of states not reaching the selected splitter, insert the smallest subclass into the list of splitters. 4. Return yes/no depending on whether the initial state of [[P1 ]] and the initial state of [[P2 ]] belong to the same class of the final partition or to different classes. The time complexity is O(m · log n), where n is the total number of states and m is the total number of transitions of [[P1 ]] and [[P2 ]].

CB is the largest congruence contained in ≈B . 3 axiom τ . P = P is no longer valid for ≈cB ; hence, ≈cB can abstract only from some intermediate τ -actions. We also mention that ≈B does not fully retain the property possessed by ∼B of respecting the branching structure of process terms. Starting from P1 ≈B P2 , a τ∗ a τ∗ if P1 −−−→ P1 then P2 ====⇒ Q −−−→ Q ====⇒ P2 with P1 ≈B P2 , but we do not know whether any relation exists between P1 and Q and between P1 and Q . The property can be restored by requiring that P1 be equivalent to Q and that P1 be equivalent to Q .

P1 ∼B a . P2 for all a ∈ Name. P1 + P ∼B P2 + P and P + P1 ∼B P + P2 for all P ∈ P. P1 S P ∼B P2 S P and P S P1 ∼B P S P2 for all P ∈ P and S ⊆ Namev . P1 /H ∼B P2 /H for all H ⊆ Namev . P1 \L ∼B P2 \L for all L ⊆ Namev . P1 [ϕ ] ∼B P2 [ϕ ] for all ϕ ∈ Relab. As far as recursion is concerned, we need to extend ∼B to open process terms by considering all possible syntactical substitutions replacing any free occurrence of a process variable with a closed process term. 8. Let P1 , P2 ∈ PL be guarded process terms containing free occurrences of k ∈ N process variables X1 , .

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