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The file classifier server that uses an activatable service is as follows: package activation; import java.rmi.Remote; 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.ServiceItem; import net.jini.core.lookup.ServiceRegistration; import net.jini.core.lease.Lease; import java.rmi.RMISecurityManager; import java.rmi.MarshalledObject; import java.rmi.activation.ActivationDesc; import java.rmi.activation.ActivationGroupDesc; import java.rmi.activation.ActivationGroupDesc.CommandEnvironment; import java.rmi.activation.Activatable; import java.rmi.activation.ActivationGroup; import java.rmi.activation.ActivationGroupID; import java.rmi.activation.ActivationSystem; import java.rmi.activation.ActivationID; import java.util.Properties; import java.rmi.activation.UnknownGroupException; import java.rmi.activation.ActivationException; import java.rmi.RemoteException; /** * FileClassifierServer.java */ public class FileClassifierServer implements DiscoveryListener { static final protected String SECURITY_POLICY_FILE = "/home/httpd/html/java/jini/tutorial/policy.all"; static final protected String CODEBASE = "http://192.168.1.13/classes/activation.FileClassifierServer-dl.jar"; protected Remote proxy; public static void main(String argv[]) { new FileClassifierServer(argv); // stick around while lookup services are found try { Thread.sleep(100000L); } catch(InterruptedException e) { // do nothing } // the server doesn't need to exist anymore System.exit(0);
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} public FileClassifierServer(String[] argv) { // install suitable security manager System.setSecurityManager(new RMISecurityManager()); ActivationSystem actSys = null; try { actSys = ActivationGroup.getSystem(); } catch(ActivationException e) { e.printStackTrace(); System.exit(1); } // Install an activation group String[] options = {"-classpath", "activation.FileClassifierServer-act.jar:phoenix-init.jar:jini-ext.jar"}; CommandEnvironment commEnv = new CommandEnvironment(null, options); Properties props = new Properties(); props.put("java.security.policy", SECURITY_POLICY_FILE); ActivationGroupDesc group = new ActivationGroupDesc(props, commEnv); ActivationGroupID groupID = null; try { groupID = actSys.registerGroup(group); } catch(RemoteException e) { e.printStackTrace(); System.exit(1); } catch(ActivationException e) { e.printStackTrace(); System.exit(1); } String codebase = CODEBASE; MarshalledObject data = null; ActivationDesc desc = null; desc = new ActivationDesc(groupID, "activation.FileClassifierImpl", codebase, data, true); ActivationID aid = null; try { aid = actSys.registerObject(desc); } catch(RemoteException e) { e.printStackTrace(); System.exit(1); } catch(ActivationException e) { e.printStackTrace(); System.exit(1); }
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try { proxy = (Remote) aid.activate(true); } catch(UnknownGroupException e) { e.printStackTrace(); System.exit(1); } catch(ActivationException e) { e.printStackTrace(); System.exit(1); } catch(RemoteException e) { e.printStackTrace(); System.exit(1); } 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(); for (int n = 0; n < registrars.length; n++) { ServiceRegistrar registrar = registrars[n]; // export the proxy service ServiceItem item = new ServiceItem(null, proxy, null); ServiceRegistration reg = null; try { reg = registrar.register(item, Lease.FOREVER); } catch(java.rmi.RemoteException e) { System.err.print("Register exception: "); e.printStackTrace(); continue; } try { System.out.println("service registered at " + registrar.getLocator().getHost()); } catch(Exception e) { } } }
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public void discarded(DiscoveryEvent evt) { } } // FileClassifierServer
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The service and the server must be compiled as usual. Nonactivatable services just require classes for the client and for the server. For activatable services, it is more complex: classes are required for the client, for the start-up server, and for phoenix. The classes that are required by the client must be copied to an HTTP server. In this case, it is only the class file rmi/RemoteFileClassifier.class, if a protocol such as Jeri is used with proxy generation at runtime. If JRMP was used, the rmic compiler would need to be run on activation/FileClassifierImpl.class and the resultant proxy would also need to be copied to the HTTP server. The classes needed by the start-up server are the file classifier server and the classes it needs. This gets a bit tricky. The server doesn t actually create the service at any time, so it doesn t need the class file for FileClassifierImpl. But when it activates the service, phoenix will create the service and return a proxy for it. This proxy will implement RemoteFileClassifier. So the server will need the class files to support a RemoteFileClassifier even though it doesn t explicitly create one. The files could be either in the server s classpath or in its codebase. This server uses the codebase as information in the proxy when it registers the service with a lookup service, so you don t want to put extra stuff in there for downloading to a client. Instead, the class files may be better off in the server s classpath. common/MIMEType.class common/FileClassifier.class rmi/RemoteFileClassifier.class activation/FileClassifierServer.class Finally, the classes needed by phoenix are FileClassifierImpl and the classes it depends on, but not the start-up server: common/MIMEType.class common/FileClassifier.class rmi/RemoteFileClassifier.class activation/FileClassifierImpl.class Before starting the service provider, a phoenix process must be set running on the same machine as the service provider. An HTTP server must be running on a machine as specified by the codebase property on the service. The service provider can then be started. This will register the service with phoenix and copy a proxy object to any lookup services found. The server can then terminate (as mentioned earlier, this causes the service s lease to expire, but techniques to handle this are described later). In summary, typically three processes are involved in getting an activatable service running:
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