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import net.jini.core.lookup.ServiceTemplate; import net.jini.discovery.LookupDiscoveryManager; import net.jini.lookup.ServiceDiscoveryManager; import net.jini.lookup.LookupCache; import net.jini.core.lookup.ServiceItem; import net.jini.lease.LeaseRenewalManager; /** * CachedClientLookup.java */ public class CachedClientLookup { private static final long WAITFOR = 100000L; public static void main(String argv[]) { new CachedClientLookup(); // stay around long enough to receive replies try { Thread.currentThread().sleep(WAITFOR); } catch(java.lang.InterruptedException e) { // do nothing } } public CachedClientLookup() { ServiceDiscoveryManager clientMgr = null; LookupCache cache = null; System.setSecurityManager(new RMISecurityManager()); try { LookupDiscoveryManager mgr = new LookupDiscoveryManager(LookupDiscovery.ALL_GROUPS, null, // unicast locators null); // DiscoveryListener clientMgr = new ServiceDiscoveryManager(mgr, new LeaseRenewalManager()); } catch(Exception e) { e.printStackTrace(); System.exit(1); } Class [] classes = new Class[] {FileClassifier.class}; ServiceTemplate template = new ServiceTemplate(null, classes, null); try { cache = clientMgr.createLookupCache(template, null, // no filter null); // no listener } catch(Exception e) { e.printStackTrace(); System.exit(1); }
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// loop until we find a service ServiceItem item = null; while (item == null) { System.out.println("no service yet"); try { Thread.currentThread().sleep(1000); } catch(java.lang.InterruptedException e) { // do nothing } // see if a service is there now item = cache.lookup(null); } FileClassifier classifier = (FileClassifier) item.service; if (classifier == null) { System.out.println("Classifier null"); System.exit(1); } // Now we have a suitable service, use it MIMEType type; try { String fileName; fileName = "file1.txt"; type = classifier.getMIMEType(fileName); printType(fileName, type); fileName = "file2.rtf"; type = classifier.getMIMEType(fileName); printType(fileName, type); fileName = "file3.abc"; type = classifier.getMIMEType(fileName); printType(fileName, type); } catch(java.rmi.RemoteException e) { System.err.println(e.toString()); } System.exit(0); } private void printType(String fileName, MIMEType type) { System.out.print("Type of " + fileName + " is "); if (type == null) { System.out.println("null"); } else { System.out.println(type.toString()); } } } // CachedClientLookup
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CHAPTER 17 SERVICEDISCOVERYMANAGER
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While it is OK to poll the local cache, the cache itself must get its contents from lookup services, and in general it is not OK to poll these because doing so involves possibly heavy network traffic. The cache gets its information by registering itself as a listener for service events from the lookup services. The lookup services will then call notify() on the cache listener. This is a remote call from the remote lookup service to the local cache, done (probably) using an RMI stub. In fact, the Sun implementation of ServiceDiscoveryManager uses a nested class, ServiceDiscoveryManager.LookupCacheImpl.LookupListener, which has an RMI stub. In order for the cache to actually work, it is necessary to set the RMI codebase property java.rmi.server.codebase to a suitable location for the class files (such as an HTTP server), and to make sure that the class net/jini/lookup/ServiceDiscoveryManager$LookupCacheImpl$ LookupListener_Stub.class is accessible from this codebase. The stub file may be found in the library lib/jini-ext.jar in the Jini 1.1 distribution. It has to be extracted from there and placed in the codebase using a command such as this: unzip jini-ext.jar \ 'net/jini/lookup/ \ ServiceDiscoveryManager$LookupCacheImpl$LookupListener_Stub.class' \ -d /home/WWW/htdocs/classes Note that the specification just says this type of thing has to be done but does not descend to details about the class name that is left to the documentation of the ServiceDiscoveryManager as implemented by Sun. If another implementation is made of the Jini classes, then it would probably use a different remote class.
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The cache uses remote events to monitor the state of lookup services. It includes a local mechanism to pass some of these changes to a client by means of the ServiceDiscoveryListener interface: package net.jini.lookup; interface ServiceDiscoveryListener { void serviceAdded(ServiceDiscoveryEvent event); void serviceChanged(ServiceDiscoveryEvent event); void serviceRemoved(ServiceDiscoveryEvent event); } with event package net.jini.lookup; class ServiceDiscoveryEvent extends EventObject { ServiceItem getPostEventServiceItem(); ServiceItem getPreEventServiceItem(); } Clients are not likely to be interested in all events generated by lookup services, even for services in which they are interested. For example, if a new service registers itself with ten
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