asp.net upc-a ACTIVATION in Font

Encode ECC200 in Font ACTIVATION

try { item = clientMgr.lookup(template, null, /* no filter */ WAITFOR /* timeout */); } catch(Exception e) { e.printStackTrace(); System.exit(1); } if (item == null) { // couldn't find a service in time System.out.println("No service found for " + cls.toString()); return null; } return item.service; } } // FileClassifierServerDiscovery To run this example, you need to perform the following steps: 1. Run the lookup service reggie. 2. Run the activation server phoenix. 3. Run the lease renewal service norm. 4. Run the lookup discovery service fiddler. 5. Run the server. This will terminate, hopefully after finding the services and registering the DiscoveryChange with the lookup discovery service, and register the leases for the service and the discovery service. An Ant file to build, deploy, and run the service is activation.FileClassifierServer Discovery.xml. It only differs from the previous Ant files in the files used. <!-- files for this project --> <property name="src.files" value="common/MIMEType.java, common/FileClassifier.java, rmi/RemoteFileClassifier.java, activation/FileClassifierImpl.java activation/FileClassifierServer.java "/> <property name="class.files" value=" common/MIMEType.class, common/FileClassifier.class, activation/FileClassifierServer.class "/> <property name="class.files.dl"

value=" rmi/RemoteFileClassifier.class "/> <property name="class.files.act" value="common/MIMEType.class, common/FileClassifier.class, rmi/RemoteFileClassifier.class, activation/FileClassifierImpl.class "/>

Summary

Some objects may not always be available, either because of mobility issues or because they are activatable objects. This chapter has dealt with activatable objects, and also with some of the special services that are needed to properly support these transient objects.

uestions often asked in the Jini mailing lists are as follows: How do I find all services and How do I deal with a service if I don t know what it is The first question is answered by searching for Object. Introspection is the answer to the second question, but if you require your services to be introspected, then you have to pay extra attention to the deployment environment. In this chapter, we look at how a client can deal with a service that it knows nothing about, and how services can cooperate up front by making enough information available to clients.

The client of 9 looked for a particular class by specifying the class in the ServiceItem. How do we find all services Well, all classes inherit from Object, so one way is to just look for all services that implement Object (this is one of the few cases where we might specify a class instead of an interface). We can adapt the client quite simply by looking for all services, and then doing something simple like printing its class: package client; import java.rmi.RMISecurityManager; import java.rmi.RemoteException; import net.jini.discovery.LookupDiscovery; import net.jini.discovery.DiscoveryListener; import net.jini.discovery.DiscoveryEvent; import net.jini.core.lookup.ServiceRegistrar; import net.jini.core.lookup.ServiceTemplate; import net.jini.core.lookup.ServiceMatches; import net.jini.core.lookup.ServiceItem; /** * BasicServiceLister */ public class BasicServiceLister implements DiscoveryListener { public static void main(String argv[]) { new BasicServiceLister(); // stay around long enough to receive replies try { Thread.currentThread().sleep(1000000L); } catch(java.lang.InterruptedException e) {

// do nothing } } public BasicServiceLister() { System.setSecurityManager(new RMISecurityManager()); LookupDiscovery discover = null; try { discover = new LookupDiscovery(LookupDiscovery.ALL_GROUPS); } catch(Exception e) { System.err.println(e.toString()); System.exit(1); } discover.addDiscoveryListener(this); } public void discovered(DiscoveryEvent evt) { ServiceRegistrar[] registrars = evt.getRegistrars(); Class [] classes = new Class[] {Object.class}; ServiceTemplate template = new ServiceTemplate(null, classes, null); for (int n = 0; n < registrars.length; n++) { ServiceRegistrar registrar = registrars[n]; System.out.print("Lookup service found at "); try { System.out.println(registrar.getLocator().getHost()); } catch(RemoteException e) { continue; } ServiceMatches matches = null; try { matches = registrar.lookup(template, Integer.MAX_VALUE); } catch(RemoteException e) { System.err.println("Can't describe service: " + e.toString()); continue; } ServiceItem[] items = matches.items; for (int m = 0; m < items.length; m++) { Object service = items[m].service; if (service != null) { printObject(service); } else { System.out.println("Got null service"); } } } }

public void discarded(DiscoveryEvent evt) { // empty } /** Print the object's class information within its hierarchy */ private void printObject(Object obj) { System.out.println("Discovered service belongs to class \n" + obj.getClass().getName()); printInterfaces(obj.getClass()); /* Class[] interfaces = obj.getClass().getInterfaces(); if (interfaces.length != 0) { System.out.println(" Implements interfaces"); for (int n = 0; n < interfaces.length; n++) { System.out.println(" " + interfaces[n].getName()); } } */ printSuperClasses(obj.getClass()); } /** Print information about superclasses */ private void printSuperClasses(Class cls) { System.out.println(" With superclasses"); while ((cls = cls.getSuperclass()) != null) { System.out.println(" " + cls.getName()); printInterfaces(cls); } } private void printInterfaces(Class cls) { Class[] interfaces = cls.getInterfaces(); if (interfaces.length != 0) { System.out.println(" which implements interfaces"); for (int n = 0; n < interfaces.length; n++) { System.out.println(" " + interfaces[n]); printInterfaces(interfaces[n]); } } } } // BasicServiceLister