By Gustavo Alonso (auth.), Thomas Gschwind, Cecilia Mascolo (eds.)
Middleware offers an integration framework for a number of and in all probability - verse computing structures. It permits builders to engineer dispensed appli- tions extra simply, supplying abstractions and primitives to address distribution and coordination. Middlewareisconstantlyfacingnewchallenges.Today’sadvancesincomp- ing, together with improvement of pervasive functions, exacerbates the variety challenge, introducing adaptations not just by way of functionality, but in addition when it comes to environments and machine features. software program engineers are the- fore challenged either within the sector of the advance of latest and scalable m- dleware structures, the place open, heterogeneous, component-based structures may still supply richer performance and companies, and within the region of program devel- ment, the place instruments to simplify using middleware options are helpful. software program Engineering and Middleware is the top-rated workshop for the - seek and perform neighborhood of software program engineering operating in either components to presentanddiscussnewideasinthis?eld.SEM2004wasthefourthinternational workshop on software program engineering and middleware of the EDO/SEM workshop sequence. past workshops of this sequence have been effectively held in 2002, 2000 and 1999. many of the complaints were released through Springer within the Lecture Notes in laptop technology series.
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Extra info for Software Engineering and Middleware: 4th International Workshop, SEM 2004, Linz, Austria, September 20-21, 2004. Revised Selected Papers
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The algorithms basically break down each message selector (query) in to a set of individual elements, which are termed cachable units. When a selector is evaluated against the message content, the result of each cacheable unit is stored in a cache data structure, which maps a cacheable unit to a Boolean result. As each message is tested against all the other registered selectors, the cache is accessed in order to locate any shared selector elements that have already been evaluated. When a cacheable unit is associated with a result for this message, its result is simply used in evaluating the current selector.
1 Preliminaries ACTA. ACTA[3, 2] is a formal framework based on first-order logic for describing transaction models and reasoning about them. It is based on a small set of fundamental concepts such as events that are classified into significant and object events, a history of events, the specification of effects of transactions on other transactions, and the specification of effects of transactions on objects: Events: A basic building block of ACTA are events, which are classified into significant and object events.
They allow, for example, to express dependencies between atomic actions by DepExpExec respectively specializations of it. pred->includes(i)) The invariant specifies that in the case both atomic actions commit, the commit of the provider must precede the commit of the dependant. DelExpExec: A DelExpExec results in delegation of responsibilities to commit individual actions of one atomic action (provider) to another (receiver). The actions an atomic action is responsible for are contained within the accessSet of AtomicActionExec.