Open Distributed Processing: Experiences with distributed by Kerry Raymond (auth.), Kerry Raymond, Liz Armstrong (eds.)

By Kerry Raymond (auth.), Kerry Raymond, Liz Armstrong (eds.)

Open dispensed Processing comprises the chosen lawsuits of the 3rd foreign convention on Open disbursed structures, equipped by way of the foreign Federation for info Processing and held in Brisbane, Australia, in February 1995. The ebook bargains with the interconnectivity difficulties that complicated machine networking increases, delivering these operating within the sector with the newest examine, together with safety and administration issues.

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Additional info for Open Distributed Processing: Experiences with distributed environments. Proceedings of the third IFIP TC 6/WG 6.1 international conference on open distributed processing, 1994

Sample text

It can be provided in a number of ways. Firstly, the objects involved can be placed in an environment which is inherently sufficiently reliable, such as a non-stop system. Secondly, the checkpointing and recovery mechanisms can be used to overcome faults when the occur. Thirdly, the replication mechanisms can be used to make faults non-damaging to the application. Which of these approaches is to be taken will depend on the relative cost and performance objectives to be met, particularly whether the system has to give real-time guarantees.

25 RM-ODP: the architecture node---- - - - - capsule 8 capsule ----- Figure 2 - Clusters, capsules and nodes Interaction within a cluster might therefore be supported by a simple local method invocation or equivalent Clusters are controlled and actions on them initiated by interaction with an associated cluster manager object. 2. Channels When objects in different clusters interact, there is a need for a good deal of supporting mechanism. Even if the objects are currently within the same capsule or node, mechanisms are needed to cope with the possibility of one or other of them terminating, failing or moving elsewhere.

To give the necessary control, the notion of a compound binding is introduced. In this form of binding (which can be expressed in terms of some piece of object behaviour involving primitive bindings), the originator of the binding instantiates a binding object, which, in turn, is bound to the set of objects which are to interact. The required rules associated with the interactions to be performed are then expressed via the behaviour of the binding object. Whenever a binding object is created, knowledge of a control interface is returned to its creator, so that changes in behaviour or configuration can be requested, or the binding object asked to terminate itself.

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