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

By Jan Newmarch

ISBN-10: 1430208600

ISBN-13: 9781430208600

ISBN-10: 1893115801

ISBN-13: 9781893115804

To comprehend Jini, think that you would be able to stream to a brand new place of work internationally, or cost into any hoteland might easily plug your computer or Palm at once into the neighborhood community. Your equipment could instantly be famous, and also you may have entry to the companies at that location—transparently.

Jini is Sun's Java-based know-how, with strength to make transparant, "universal plug and play" a truth. This e-book is an accelerated, up to date model of the most well-liked on-line instructional for Jini. writer Jan Newmarch contains accomplished Jini developments introduced at Java One in June 2000. And he comprises different very important themes, like how firm Java Beans combination in with the Jini framework and the way CORBA suits in as well.

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This returns exact1y the same type of object as is used in the unicast lookup, but now its fields are filled in by the discovery process. getHost(»j } } You could use the discovered () method to find out where a service locator is so that the next time this program mns, it could connect direct1y by unicast. The third method, getServiceIDO, is unlikelyto be ofmuch use to you. In general, service IDs are used to give a globaHy unique identifier for the service (different services should not have the same ID), and a service should have the same ID with aH service locators.

84 on port 4160. How far do these announcements reach? This is controlled by two things: • the time-to-live (TTL) field on the packets • the network administrator settings on routers and gateways By default, the current implementation of LookupDiscovery sets the TTL to 15. Common network administrative settings re strict such packets to the local network. However, the TTL can be changed by giving the system property net. j ini. discovery. tU a different value. However, be careful about setting this; many people will get irate if you flood the networks with multicast packets.

It is a pity from the programmer's view that a more flexible mechanism was not used. One suggestion often made in the Iini mailing list is that there should be a boolean matches () method on the service object. However, that would involve unmarshalling the service on the locator in order to run the matches () method, and this would slow the lookup service down and generate a couple of awkward questions: • What security permissions should the filter run with?

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

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