A Programmer’s Guide to Jini™ Technology by Jan Newmarch

By Jan Newmarch

To comprehend Jini, think which you can flow to a brand new workplace the world over, or cost into any hoteland may easily plug your computer or Palm at once into the neighborhood community. Your equipment could instantly be well-known, and also you may have entry to the providers at that location—transparently.

Jini is Sun's Java-based expertise, with power to make transparant, "universal plug and play" a fact. This booklet is an accelerated, up to date model of the preferred on-line instructional for Jini. writer Jan Newmarch comprises finished Jini developments introduced at Java One in June 2000. And he contains different very important subject matters, like how firm Java Beans combination in with the Jini framework and the way CORBA suits in as well.

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Running rmid has beneficial side-effects. It maintains log files of its own state, which includes the activable objects it is storing. Sa reggie can crash ar terminate, and rmid will restore it as needed. Indeed, even rmid can crash ar be terminated, and it will use its log files ta restore state sa that it can stiU accept calls for reggie objects. Summary AJini system is made up ofthree parts: • Service • Client • Service locatar 15 Chapter 1 Code is moved between these parts of applications. A registrar acts as a proxy to the lookup locator and runs on both the client and service.

Println("Registrar search failed: " + e. err. println("Registrar search failed: " + e. println("Registrar found"); II the code takes separate routes from here for client or service } } II UnicastRegister The registrar abject will be used in different ways for clients and services: the services will use it ta register themselves, and the c1ients will use it ta locate services. 31 Chapter3 This program might not run as is, dlle to security isslles. Ifthat is the case, see the first section o[Clzapter 12.

This class performs network lookup on the URL given in the LookupLocator constructor. UML sequence diagrams are useful for showing the timelines of object existence and the method caUs that are made from one object to another. The timeline reads down, and the method calls and their returns read across. A UML sequence diagram augmented with a jagged arrow showing the network connection is shown in Figure 3-1. The UnicastRegister object makes a new() call to create a LookupLocator, and this calI returns a lookup object.

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