Autonomics Development: A Domain-Specific Aspect Language by Paul Soule (auth.)

By Paul Soule (auth.)

Distributed purposes are tough to put in writing as programmers have to adhere to precise disbursed structures programming conventions and frameworks, which makes dispensed structures improvement advanced and blunder companies and ties the ensuing software to the disbursed method as the application's code is tangled with the crosscutting quandary distribution. This e-book introduces the idea that of a domain-specific element language referred to as a Distribution Definition Language that generalises the distribution and distribution restoration matters through describing the sessions and techniques of an current software to be made distant, the dispensed procedure to take advantage of to cause them to distant and the restoration mechanism to take advantage of within the occasion of an mistakes. A software program device within the type of the RemoteJ compiler/generator that makes use of info inside the Distribution Definition Language to generate the restoration and disbursed process particular code and use it on the applying utilizing bytecode manipulation and new release thoughts is brought. through permitting distribution and autonomic beneficial properties, equivalent to restoration, to be modularised and utilized to latest purposes this procedure vastly simplifies disbursed platforms and autonomics improvement. This ebook is of specific curiosity to researchers and scholars of dispensed platforms, autonomics, domain-specific element languages and aspect-orientation.

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A request is sent from a client to a server via the ORB and the client suspends awaiting a response from the server. In this scenario, both client and server must be available. The CORBA event service [76] decouples communication between clients and servers using either the push model or the pull model. The push model allows the supplier of events to initiate the transfer of event data to consumers, while the pull model reverses this by allowing the event consumer to request event data from the producer.

The ORB then returns the result back to the requesting client. 4 Summary CORBA has similar issues to RPC type systems in that the range of values that can be passed between systems, either as arguments or return values, is limited to those that can be represented in all of the implementation languages supported. In addition, as with all IDLs, programmers have an additional language to learn and an additional artefact to deal with. A limitation with the object-oriented nature of CORBA is that objects are passed by reference not by value.

RMI implements remote garbage collection by keeping track of all live remote references in all virtual machines. When a remote object is first referenced, a count is incremented and a referenced message is sent to the remote object’s RMI runtime. When a live reference is unreferenced, the count is decremented. When the count reaches 0 an unreferenced message is sent to the remote object’s RMI runtime, which is then free to garbage-collect the object. Clients hold references to remote objects for a certain period of time, called a lease.

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