Communication Framework

Transcription

1 Communication Framework G.Riviere

2 Contents RMI Overview Multi-Protocol with RMI-IIOP Multi-Name Services with JNDI RMI Context Propagation Conclusion (Communication 2/42) - June, 4th 2002

3 Contents RMI Overview RMI JRMP, the Java RPC RMI IIOP, the Java RPC on the top of CORBA Multi-Protocol with RMI-IIOP Multi-Name Services with JNDI RMI Context Propagation Conclusion (Communication 3/42) - June, 4th 2002

4 RMI JRMP RPC with Java serialization JRMP remote object generation Implements Remote Interface RMI Classes generation V1.1 one Stub and one Skeleton V1.2 only one Stub JRMP remote object server instantiation Exported by UnicastRemoteObject Extends UnicastRemoteObject, export in constructor UnicastRemoteObject static method Binded in a Name Service Java: Registry JRMP remote object client access Lookup in a Name Service Stub visible in the Classpath PortableRemoteObject.narrow (J2EE) (Communication 4/42) - June, 4th 2002

5 JRMP overview SPI InitialContext Registry bind JNDI API InitialContext Registry InitialContext bind lookup JRMP export Remote Method call Server JRMP Client (Communication 5/42) - June, 4th 2002

6 JRMP 1.1 method call Remote Object Client Skeleton Impl Stub Methods Implementation Skeleton with (Object Remote Reference Interface) Stub Impl Delegation Remote Ref with Server Ref port address Delegation Server Ref with port address Skeleton Server Ref Java Serialization Remote Ref Stub (Communication 6/42) - June, 4th 2002

7 JRMP 1.2 method call Remote Object Client Reflection Stub Impl Delegation Server Ref Java Serialization Remote Ref Stub (Communication 7/42) - June, 4th 2002

8 Contents RMI Overview RMI JRMP, the Java RPC RMI IIOP, the Java RPC on the top of CORBA Multi-Protocol with RMI-IIOP Multi-Name Services with JNDI RMI Context Propagation Conclusion (Communication 8/42) - June, 4th 2002

9 RMI IIOP RPC with IIOP (GIOP on TCP/IP) serialization IIOP remote object generation Implements Remote Interface RMI Classes generation one Stub and one Tie (CORBA Skeleton) IIOP remote object server instantiation Exported by PortableRemoteObject Extends PortableRemoteObject, export in constructor PortableRemoteObject static method PortableRemoteObject Delegation Mechanism Binded in a Name Service CORBA: CosNaming IIOP remote object client access Lookup in a Name Service Stub visible in the Classpath PortableRemoteObject.narrow (J2EE) (Communication 9/42) - June, 4th 2002

10 IIOP overview SPI InitialContext CosNaming JNDI API InitialContext CosNaming bind lookup InitialContext bind Remote Method call IIOP Client IIOP export Server (Communication 10/42) - June, 4th 2002

11 IIOP method call Remote Object Client Skeleton (Tie) IIOP Serialization CORBA Bus Stub (Communication 11/42) - June, 4th 2002

12 IIOP SPI InitialContext CosNaming JNDI API InitialContext Remote Method call IIOP Client IIOP export Server (Communication 12/42) - June, 4th 2002

13 IIOP PortableRemoteObject Server, Remote Object IIOP export, narrow, tostub, connect, unexport RMI IIOP PortableRemoteObject Delegation P.R.O. Delegate Stub Delegation Stub Delegate Util Delegation Util Delegate javax.rmi.corba.portableremoteobjectclass javax.rmi.corba.stubclass javax.rmi.corba.utilclass ORB ORBSingleton CORBA org.omg.corba.orbclass org.omg.corba.orbsingletonclass (Communication 13/42) - June, 4th 2002

14 IIOP Conclusion We have the control of the PortableRemoteObjectDelegate Bind, Lookup => Stub propagation We use CORBA mechanism in RMI IIOP CORBA ServiceContext Portable Interceptor (CORBA 2.4) (Communication 14/42) - June, 4th 2002

15 Contents RMI Overview Multi-Protocol with RMIR MI-IIOPIIOP Multi protocol overview RMI IIOP architecture for multi protocol Multi-Name Services with JNDI RMI Context Propagation Conclusion (Communication 15/42) - June, 4th 2002

16 Multi Protocol Server Protocol Independent Use of RMI IIOP for root node in the protocol tree No impact on client conception/coding No impact on server conception/coding (standard RMI IIOP) Remote object accessible on more than one protocol at Runtime, by configuration RMI IIOP (David, JDK ) RMI JRMP Jeremie RMI over XML (later) Standard clients for each protocol (Communication 16/42) - June, 4th 2002

17 Multi Protocol overview CosNaming bind SPI InitialContext CosNaming JNDI API InitialContext Registry Registry bind lookup InitialContext bind Remote Method lookup call IIOP Client Server Rmi JRMP and IIOP export Remote Method call JRMP Client (Communication 17/42) - June, 4th 2002

18 Contents RMI Overview Multi-Protocol with RMIR MI-IIOPIIOP Multi protocol overview RMI IIOP architecture for multi protocol Multi-Name Services with JNDI RMI Context Propagation Conclusion (Communication 18/42) - June, 4th 2002

19 RMI IIOP multi export architecture One Portable Remote Object Delegate (PROD) for each protocol RMI IIOP PROD : Standard in rmi iiop RMI JRMP PROD : Mapping of the UnicastRemoteObject A system property to set our Multi PROD A multi-protocol configuration mechanism (for example XML file) (Communication 19/42) - June, 4th 2002

20 RMI IIOP multi export scheme Remote export(myobject) (static) PRO JRMP myobject IIOP Configuration Mechanism XML File uses PROD implements MultiPROD export(myobject) RMI JRMP PROD RMI IIOP PROD rmic, Jeremic, david ic, rmic iiop, etc. JRMP export IIOP export (Communication 20/42) - June, 4th 2002

21 Contents RMI Overview Multi-Protocol with RMI-IIOP Multi-Name Services with JNDI Problem Current solution Lookup, tostub problem RMI Context Propagation Conclusion (Communication 21/42) - June, 4th 2002

22 Name services problem CosNaming bind SPI InitialContext CosNaming JNDI API InitialContext Registry Registry bind InitialContext bind IIOP Client Server JRMP Client (Communication 22/42) - June, 4th 2002

23 Contents RMI Overview Multi-Protocol with RMI-IIOP Multi-Name Services with JNDI Problem Current solution Lookup, tostub problem RMI Context Propagation Conclusion (Communication 23/42) - June, 4th 2002

24 Current solution MultiInitialContext System SPI MultiInitialContext Factory Server system property Djava.naming.factory.initial sets to this MultiInitialContext Factory Standard new InitialContext() This Multi InitialContext calls the InitialContext for each protocol jndi api/spi for each protocol (Communication 24/42) - June, 4th 2002

25 Current solution CosNaming bind SPI InitialContext CosNaming JNDI API InitialContext Registry Registry bind InitialContext bind Server (Communication 25/42) - June, 4th 2002

26 Current solution CosNaming bind CosNaming SPI JRMP IIOP Registry bind New InitialContext(JRMP InitialContext(IIOP properties) Registry JNDI API InitialContext JRMP I.C. IIOP I.C. SPI MultiFactory -Djava.naming.factory.intial=< =<MutliFactory> New InitialContext() MultiInitalContext bind Configuration Mechanism XML File JNDI API InitialContext Server (Communication 26/42) - June, 4th 2002

27 Contents RMI Overview Multi-Protocol with RMI-IIOP Multi-Name Services with JNDI Problem Current solution Lookup, tostub problem RMI Context Propagation Conclusion (Communication 27/42) - June, 4th 2002

28 Lookup, tostub problem In the Server, with Multi-Protocol object access, if a method (like lookup) returns a stub: On which PROD build this Stub (tostub method)? On which NameService find this Stub (lookup method)? We can define a default protocol, but there is another problem : If the default protocol is RMI IIOP A RMI JRMP client calls a method that returns a Remote Object This method returns a Stub for RMI IIOP and not for RMI JRMP! So for this problem we can also make for each protocol An Interceptor that sets a Current Thread to the right protocol (Communication 28/42) - June, 4th 2002

29 Lookup, tostub problem Configuration Mechanism XML File getprotocol SPI InitialContext CosNaming JNDI API InitialContext Registry ThreadLocal InitialContext lookup JRMP Server Interceptor Current : JRMP Server setjrmpprotocol Remote Method call JRMP Client (Communication 29/42) - June, 4th 2002

30 Contents RMI Overview Multi-Protocol with RMI-IIOP Multi-Name Services with JNDI RMI Context Propagation CORBA Portable Interceptor Portable Interceptor Overview ServiceContext static final Class Interceptor: A solution also for JRMP Custom UnicastRemoteObject, ServerRef and ClientRef for Portable Interceptor integration in JRMP Conclusion (Communication 30/42) - June, 4th 2002

31 Portable Interceptor Overview Portable Interceptor (P.I.) CORBA 2.4+, JDK 1.4+ Package org.omg.portableinterceptor A standard way for ServiceContext propagation Mechanism overview Interface ORBInitialisation for P.I. Configuration post_init and pre_init methods System property (org.omg.corba.orbinitiliazerclass) Interface ServerRequestInterceptor Server Interceptor receive_request, send_reply, send_exception interception Interface ClientRequestInterceptor Client Interceptor Send_request, receive_reply, receive_exception interception (Communication 31/42) - June, 4th 2002

32 Portable Interceptor Overview Remote Object Client Server Interceptor IIOP Serialization Client Interceptor Skeleton (Tie) CORBA Bus Stub (Communication 32/42) - June, 4th 2002

33 Portable Interceptor Overview Server Interceptor Client Interceptor IIOP Serialization Method call Get ServiceContext Add ServiceContext ServiceContext Array ServiceContext Array CORBA Bus (Communication 33/42) - June, 4th 2002

34 Static final class ServiceContext Simple Class One int field : the ServiceContext id One byte [ ] field : the ServiceContext Static final class No inheritance mechanism This class is not marshaled by the ORB the orb only sends an int and a byte [ ] (Communication 34/42) - June, 4th 2002

35 Contents RMI Overview Multi-Protocol with RMI-IIOP Multi-Name Services with JNDI RMI Context Propagation CORBA Portable Interceptor Portable Interceptor Overview ServiceContext static final Class Interceptor: A solution also for JRMP Custom UnicastRemoteObject, ServerRef and ClientRef for Portable Interceptor integration in JRMP Conclusion (Communication 35/42) - June, 4th 2002

36 JRMP Portable Interceptor The Server knows, by configuration, the client and the server interceptors classes The ServerRef sends the RemoteRef with the client interceptor There is no stub/skeleton modification Configuration only in the server side Client interceptors classes in the client classpath (Communication 36/42) - June, 4th 2002

37 Remote Object JRMP 1.1 Portable Interceptor Client Skeleton Impl Stub Impl Delegation UnicastRemoteObject Delegation Server Interceptor getserverrefclass Client Interceptor Skeleton Server Ref Java Serialization getremoterefclass() Remote Ref Stub (Communication 37/42) - June, 4th 2002

38 JRMP 1.2 portable Interceptor Remote Object Client Reflection Stub Impl Delegation Server Interceptor Client Interceptor Server Ref Java Serialization Remote Ref Stub (Communication 38/42) - June, 4th 2002

39 JRMP Portable Interceptor Overview Server Interceptor Client Interceptor JRMP Serialization Method call Get ServiceContext Add ServiceContext ServiceContext Array ServiceContext Array ServerRef, RemoteRef architecture (Communication 39/42) - June, 4th 2002

40 Contents RMI Overview Multi-Protocol with RMI-IIOP Multi-Name Services with JNDI RMI Context Propagation Conclusion (Communication 40/42) - June, 4th 2002

41 Conclusion Configuration problem Xml file, properties? Jonathan Portable Interceptor Problem End of the summer Referenceable Problem The CosNaming does nt accept Referenceable binding Interceptor Problem org.omg.portableinterceptor.* interfaces for JRMP Problem Stub jar location problem One stub jar for each protocol The prototype works fine! Both RMI IIOP and RMI JRMP access XML file configuration JRMP Context propagation with JRMP Portable Interceptor IIOP Context propagation with CORBA Portable Interceptor MultiInitialContext (Communication 41/42) - June, 4th 2002

42 Questions (Communication 42/42) - June, 4th 2002