By Jan Newmarch
To comprehend Jini, think you can stream to a brand new workplace internationally, or money into any hoteland may easily plug your computer or Palm without delay into the neighborhood community. Your gadget may instantly be famous, and also you could 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 ebook is an extended, up-to-date model of the most well-liked on-line educational for Jini. writer Jan Newmarch comprises complete Jini developments introduced at Java One in June 2000. And he comprises different very important issues, like how firm Java Beans combination in with the Jini framework and the way CORBA suits in as well.
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40 Discovering a Lookup Service Information from the 5erviceRegistrar The ServiceRegistrar is returned after a successful discovery has been made. This object has a number of methods that will return useful information about the lookup service. So, in addition to using this object to register a service or to look up a service, you can use it to tind out about the lookup locator. The major methods are these: String getGroups()jj LookupLocator getLocator()j ServiceID getServiceID()j The first method, getGroups (), will return a list of the groups that the locator is amemberof.
2 -d . FileClassifierlmpl This will create a FileClassifierlmpl_ Stub. class in the rmi subdirectory. The stub class file needs to be accessible to the Java runtime in the same wayas the original class file. FileClassifierlmpl_Stub This errar arises when an object is trying to get a remote reference to FileClassi fierlmpl, and it is trying to load the class file for the stub from an HTTP server. What makes this one particularly annoying is that it may not be referring to the FileClassifierlmpl_Stub at all!
This is just the information fed into the constructor or left to default values, though. It doesn't offer anything new for unicasting. This information will be useful in the multicast situation, though, ifyou need to find out where the lookup service is. 29 Chapter3 getRegistrar Search and lookup is performed by the getRegistrarO method ofthe LookupLocator, which returns an object of class ServiceRegistrar. ClassNotFoundException The ServiceRegistrar class is discussed in detaillater. This class performs network lookup on the URL given in the LookupLocator constructor.