Vorbereitungen Download. AVO-Übung 6. Beispiel. Slice. Varianten u.a. für Linux, Windows, OS X ICE-Dokumentation ICE-Binaries (inkl.

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1 Vorbereitungen Download AVO-Übung ICE Andreas I. Schmied AspectIX-Team Abteilung Verteilte Systeme Universität Ulm WS005 Varianten u.a. für Linux, Windows, OS X ICE-Dokumentation ICE-Binaries (inkl. slicejava) Aktuelle Version Ggf. ältere bei inkompatiblen Bibliothek verwenden Dann ICE-Java-Quellen separat runterzuladen Linux: Bibliotheken zugänglich machen 1 bash: export LD LIBRARY PATH=${YOUR ICE PATH}/lib Eclipse-Launches: Ggf. externe Pfade anpassen : ( andreas.schmied@uni-ulm.de AVO-Übung (WS005) 1 Beispiel Slice Kleiner Aufgaben-Verteiler Clients melden offene Aufträge Server versendet Ankündigung an alle Clients Der erste Client bekommt den Auftrag Benutzte Techniken? Slice Interfacebeschreibung Facets Alternative Admin-Schnittstelle ObjectFactory Demarshalling von Classes IceStorm Benachrichtigungen IceBox IceStorm-Server...? Benötigte Artefakte Task, Task-Liste Bearbeiter (hier einfach Strings) Announcement Manager Admin-Schnittstelle andreas.schmied@uni-ulm.de AVO-Übung (WS005) andreas.schmied@uni-ulm.de AVO-Übung (WS005) 3

2 Slice Tasks.ice (Skizze) Slice Tasks.ice (Announcement, Task) 1 module avo { 3 interface Task; // forward declaration 5 sequence<string> Names; sequence<task> Tasks; 8 dictionary<string, Tasks> TaskMap; 9 exception UnknownName { string name; }; 11 1 struct Date { short day; short month; short year; }; 1 interface Announcement {... }; 1 interface Task {... }; 1 class SimpleTask implements Task {... }; interface Manager {... }; // main facet 0 interface ManagerAdmin {... }; // admin facet 1 }; 1 module avo {... 3 interface Announcement { // for IceStorm void OpenTask(int id, string info, Date due); 5 }; interface Task { 8 string info(); 9 void setinfo(string new); string worker(); 11 Date due(); 1 }; 1 class SimpleTask implements Task { string theinfo; 1 Date thedue; 1 string theworker; 18 }; 1; andreas.schmied@uni-ulm.de AVO-Übung (WS005) andreas.schmied@uni-ulm.de AVO-Übung (WS005) 5 Slice Tasks.ice (Manager, Admin) Server Schritte 1 module avo {... 3 interface Manager { // main facet 5 nonmutating int getnumopentasks(); void addtask(string info, Date due, 8 [ java:type:java.util.arraylist<string> ] 9 Names workers) throws UnknownName; 11 boolean taketask(string worker, int id); 1 Task getfirsttask(string worker); 1 Task getfirsttaskcopy(string worker); 1 SimpleTask getfirstsimpletask(string worker); 1 SimpleTask getfirstsimpletaskcopy(string worker); 18 }; 19 0 interface ManagerAdmin { // admin facet 1 idempotent void clearalltasks(); void shutdown(); 3 }; AVO-Übung andreas.schmied@uni-ulm.de }; (WS005) Initialisiert Adapter Erzeugt Topic für Announcements Oder bereits vorhandenes verwenden Erzeugt Manager und Admin Ein Objekt, zwei Facetten Wartet auf Shutdown Durch Admin-Schnittstelle ausführbar andreas.schmied@uni-ulm.de AVO-Übung (WS005)

3 Server Server.java (main, Rahmen) Server Server.java (main, IceStorm) 1 Ice.Communicator ic = Ice.Util.initialize(args); 3 Ice.ObjectAdapter oa = ic.createobjectadapterwithendpoints( AvoAdapter, tcp -p 9999 ); 5... naechste Folie: IceStorm Topic... 8 ManagerI manager = new ManagerI(anmt); 9 ManagerAdminI admin = new ManagerAdminI(manager); 11 Identity id = Ice.Util.stringToIdentity( Manager ); 1 oa.add(manager, id); oa.addfacet(admin, id, Admin ); 1 oa.activate(); 1 ic.waitforshutdown(); 1 ic.destroy(); ObjectPrx tm$ = ic.stringtoproxy( IceStorm/TopicManager :tcp p 9998 ); TopicManagerPrx tm = TopicManagerPrxHelper.checkedCast(tm$); 5 TopicPrx top; try { 8 top = tm.retrieve( Announcement ); catch(icestorm.nosuchtopic e) { 11 top = tm.create( Announcement ); 1 } 1 AnnouncementPrx anmt = AnnouncementPrxHelper.uncheckedCast(top); 1... UncheckedCast: Dynamische Servants im IceStorm-Server andreas.schmied@uni-ulm.de AVO-Übung (WS005) 8 andreas.schmied@uni-ulm.de AVO-Übung (WS005) 9 Server ManagerI.java (Auszug) Server ManagerI.java (activatetask) 1 public class ManagerI extends ManagerDisp {... 3 public ManagerI(AnnouncementPrx anmt) { this.anmt=anmt; } 5 public void addtask(string info, Date due, ArrayList<String> workers, Current current) throws UnknownName { 8 if (valid(workers)) addtask(new SimpleTaskI(info, due, worker)); 9 else throw new UnknownName(worker); } 11 public TaskPrx getfirsttask(string worker, Current current) 1 { return getfirstsimpletask(worker, current); } // polymorphism! 1 public Task getfirsttaskcopy(string worker, Current current) { return getfirsttaskcopy(worker, current); } // polymorphism! 1 1 public SimpleTaskPrx getfirstsimpletask(string worker, Current current) { 18 SimpleTask t = firsttaskof(worker); 19 return t==null? null : activatetask(t); 0 } 1 public SimpleTask getfirstsimpletaskcopy(string worker, Current current) { 3 return firsttaskof(worker); andreas.schmied@uni-ulm.de } AVO-Übung (WS005) 5 } 1 SimpleTaskPrx activatetask(simpletask t) { 3 SimpleTaskPrx p = gettaskproxy(t); // via HashMap? 5 if (p==null) { p = SimpleTaskPrxHelper.uncheckedCast( current.adapter.addwithuuid(t) ); 8 savetaskproxy(p); // ad new prox to HashMap 11 return p; 1 } Wie kann man get/savetaskproxy automatisieren? Gibt es CORBA-like Implicit Activation + Active Object Map? andreas.schmied@uni-ulm.de AVO-Übung (WS005) 11

4 Server ManagerAdminI.java Client Schritte 1 public class ManagerAdminI extends ManagerAdminDisp { 3 ManagerI manager; 5 ManagerAdminI(ManagerI m) { this.manager=m; } public void clearalltasks(ice.current current) { public void shutdown(ice.current current) { 1 current.adapter.getcommunicator().shutdown(); } 1 } Als Testcase programmiert Bezieht Referenz auf Manager (Proxy!) Meldet neuen Auftrag an Testest By-Copy vs. By-Reference Soll auf Announcements antworten andreas.schmied@uni-ulm.de AVO-Übung (WS005) 1 andreas.schmied@uni-ulm.de AVO-Übung (WS005) Client Client.java (main, Rahmen) Client Client.java (main, Details) 1 Ice.Communicator ic = Ice.Util.initialize(args); Ice.ObjectPrx manager = ic.stringtoproxy( Manager t :tcp p 9999 h ); 3 ManagerPrx manager = ManagerPrxHelper.checkedCast( manager); 5 Date due = new Date((short), (short), (short)00); ArrayList<String> workers =...;...; 8 manager.addtask( job, due, workers); 9 log( open tasks: +manager.getnumopentasks()); naechste Folie: Diverse Tests... 1 ManagerAdminPrx admin = ManagerAdminPrxHelper.checkedCast(manager, Admin ); admin.shutdown(); 1 ic.destroy(); 1 SimpleTask task; // by copy 3 try { task = manager.getfirstsimpletaskcopy( Alex ); } catch (NoObjectFactoryException e) { 5 ic.addobjectfactory(new AnyTaskFactory(), ::avo::simpletask ); } 8 9 task = manager.getfirstsimpletaskcopy( Alex ); assert task.theinfo.equals( job ); 11 task.theinfo = weekend ; 1 task = manager.getfirstsimpletaskcopy( Alex ); assert task.theinfo.equals( job ); 1 SimpleTaskPrx task$ = manager.getfirstsimpletask( Alex ); // by reference 1 1 assert task$.info().equals( job ); 18 task$.setinfo( weekend ); 19 task$ = manager.getfirstsimpletask( Alex ); 0 assert task$.info().equals( weekend ); andreas.schmied@uni-ulm.de AVO-Übung (WS005) 1 andreas.schmied@uni-ulm.de AVO-Übung (WS005)

5 Client AnyTaskFactory Client Announcement-Handler 1 import Ice.LocalObjectImpl; import Ice.Object; 3 import Ice.ObjectFactory; 5 public class AnyTaskFactory extends LocalObjectImpl implements ObjectFactory { 8 public Object create(string type) { 9 if(type.equals( ::avo::simpletask )) { return new SimpleTaskI(); 11 } 1 assert false; return null; 1 } public void destroy() {} 1 } 1 class AnnouncementI extends AnnouncementDisp { 3 public void OpenTask(int id, string info, Date due) { if (manager.taketask(myworkername, id)) addtodo(id, info, due); } 5 } // Erweiterung in: Client.main 8 9 Ice.ObjectPrx obj = ic.stringtoproxy( IceStorm/TopicManager:tcp p 9998 ); IceStorm.TopicManagerPrx topicmanager = 11 IceStorm.TopicManagerPrxHelper.checkedCast(obj); 1 Ice.ObjectAdapterPtr adapter = ic.createobjectadapter( AnnouncementAdapter ); 1 Announcement anmt = new AnnouncementI(); 1 Ice.ObjectPrx proxy = adapter.addwithuuid(anmt); 1 IceStorm.TopicPrx topic = topicmanager.retrieve( Announcement ); topic.subscribe(null, proxy); // null: no QoS 0 1 adapter.activate(); ic.waitforshutdown(); topic.unsubscribe(proxy); andreas.schmied@uni-ulm.de AVO-Übung (WS005) 1 andreas.schmied@uni-ulm.de AVO-Übung (WS005) 1 IceStorm Deployment Aufgabe Ice-Manual querlesen: 1 Seiten! Konfigurationsdatei 1 IceBox.Service.IceStorm=IceStormService,30:create Freeze.DbEnv.IceStorm.DbHome=db 3 IceStorm.TopicManager.Endpoints=tcp p 9998 IceStorm.Publish.Endpoints=tcp Verzeichnis db muss existieren! IceBox-Server: icebox Ice.Config=<Configfile> Vergleich mit CORBA, RMI,... Pendant zu CORBA Implicit Activation vorhanden? Profiles, Policies, etc.? Welche Dateien werden generiert Verstehen, Nachprogrammieren Weitere Übungsfelder Dynamische Aufrufe Freeze Evictor Indirect Proxies, Locator C++ Client mit Java Server, etc. andreas.schmied@uni-ulm.de AVO-Übung (WS005) 18 andreas.schmied@uni-ulm.de AVO-Übung (WS005) 19