By Jan Newmarch
To comprehend Jini, think you can movement to a brand new place of work internationally, or payment into any hoteland may easily plug your pc or Palm without delay into the neighborhood community. Your gadget could instantly be well-known, and also you could have entry to the providers at that location—transparently.
Jini is Sun's Java-based know-how, with strength to make transparant, "universal plug and play" a truth. This booklet is an accelerated, up-to-date model of the most well-liked on-line instructional for Jini. writer Jan Newmarch contains finished Jini developments introduced at Java One in June 2000. And he comprises different vital subject matters, like how firm Java Beans mixture in with the Jini framework and the way CORBA suits in as well.
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Extra resources for A Programmer’s Guide to Jini™ Technology
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.
ClassNotFoundException The ServiceRegistrar class is discussed in detaillater. 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.
An a small network, such as a home network, there may be just a single lookup service, but in a large network there may be manyperhaps one or two per department. Each one of these may choose to reply to a broadcast request. 32 Discovering a Lookup Service Groups Some services may be meant for anyone to use, but some may be more restricted in applicability. For example, the Engineering department may wish to keep lists of services specific to that department. This may include a departmental diary service, a departmental inventory, etc.
A Programmer’s Guide to Jini™ Technology by Jan Newmarch