Object Oriented Design

Download Research Directions in Concurrent Object-Oriented by Gul Agha, Peter Wegner, Akinori Yonezawa PDF

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By Gul Agha, Peter Wegner, Akinori Yonezawa

This selection of unique study offers a entire survey of advancements on the innovative of concurrent object-oriented programming. It files progress—from common strategies to precise descriptions—in programming language layout, semantic instruments, structures, architectures, and functions. Chapters are written at an academic point and are available to a large viewers, together with researchers, programmers, and technical managers. the matter of designing platforms for concurrent programming has develop into an more and more very important sector of analysis in computing device technological know-how with a concomitant raise within the approval for object-based programming. simply because parallelism is a ordinary outcome of using items, the improvement of platforms for concurrent object-oriented programming is delivering very important software program help for a brand new iteration of concurrent pcs.

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Concurrent objects may be busy when a message arrives and may need to make a nondeterministic choice among several waiting messages. Select statements resolve indeterminism by selecting messages in order of their arrival, and resolve nondeterminism by making an irrevocable committed choice to the selected alternative. Committed-choice nondeterminism is also called don't-care nondeterminism, since agents faced with multiple choices behave as though they do not care which alternative is chosen. DEFINITION Nondeterministic choice among several next actions that is resolved by irrevocable commitment to one alternative is called committed-choice nondeterminism (don't-care nondeterminism).

Solutions must satisfy the set of all unification constraints. DEFINITION Component-based programs are said to be reductive if the primary computational step causes reduction of a goal to a set of subgoals. Prolog programs are reductive, since execution of a Prolog clause of the form; P :- Ql,Q2, ... ,Qk reduces the goal P to the subgoals Q1,Q2, ... ,Qk. 4 Don't-Know Nondeterminism To prove the goal P(E} we can choose any clause in the component for P such that E unifies with E i . In pure Prolog, all clauses for which E unifies with E, may in principle be executed in parallel.

In the procedural interpretation of logic programs predicates are viewed as procedures and the clause P ;- Q1, Q2, , Qk is viewed as a problem reduction of the procedure P to the procedures Q1, Q2, , Qk. Don't-know non determinism prohibits procedures from sending messages to each other. 5 Retractiveness Because failure to reduce a goal requires the process of reduction to have a null effect, components cannot have side-effects on other components during reduction. Thus components of a logic program cannot interact during their execution; they can return only the answers "yes with associated substitution" or "no".

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