RPC Remote Procedure Call

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Elinor Caldwell
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1 RPC Remote Procedure Call Stand-alone program #include <stdio.h> long bin_date(void); char *str_date(long bintime); main(int argc, char **argv) { long lresult; /* return from bin_date */ char *sresult; /* return from str_date */ if (argc!= 1) { fprintf(stderr, "usage: %s\n", argv[0]); exit(1); /* call the procedure bin_date */ lresult = bin_date(); printf("time is %ld\n", lresult); /* convert the result to a date string */ sresult = str_date(lresult); printf("date is %s", sresult); exit(0);

2 RPC Remote Procedure Call Stand-alone program: functions long bin_date(void) { long timeval; long time(); /* Unix time function */ timeval = time((long *)0); return timeval; char *str_date(long bintime) { char *ptr; char *ctime(); /* Unix library function */ ptr = ctime(&bintime); return ptr;

3 RPC Remote Procedure Call Klient (na počítači A) Server (na počítači B) Lokální volání funkce Marshalling (serializace) argumentů Unmarshalling (deserializace) argumentů Klientský program Zaslání požadavku Služba Vykonání požadavku Unmarshalling (deserializace) návratové hodnoty Marshalling (serializace) návratové hodnoty

4 RPC Remote Procedure Call Sluzba.idl Klient (na počítači A) Server (na počítači B) rpcgen Klientský program Stub Skeleton Služba

5 RPC Remote Procedure Call Sluzba.idl Klient (na počítači A) Server (na počítači B) Klientský program IDL Definitions program DATE_PROG { version DATE_VERS { Stub rpcgen long BIN_DATE(void) = 1; string STR_DATE(long) = 2; = 1; = 0x ; version number function number Skeleton Služba date.h: header file date_clnt.c: client stub date_svc.c: server stub program number

6 RPC Remote Procedure Call Vygenerovaný skeleton: #include date.h long * bin_date_1_svc(void *argp, struct svc_req *rqstp) { static long result; /* insert server code here */ return &result; char ** str_date_1_svc(long *argp, struct svc_req *rqstp) { static char *result; /* insert server code here */ return &result;

7 RPC Remote Procedure Call Modifikace klienta #include <rpc/rpc.h> #include date.h CLIENT *cl; /* rpc handle */ cl = clnt_create(server, DATE_PROG, DATE_VERS, netpath ); long *lresult; /* return from bin_date_1 */ char **sresult; /* return from str_date_1 */ if ((lresult=bin_date_1(null, cl))==null) { clnt_perror(cl, server); exit(1); printf("time on %s is %ld\n", server, *lresult); if ((sresult=str_date_1(lresult, cl)) == NULL) { clnt_perror(cl, server); exit(1); printf("date is %s", *sresult);

8 CORBA Common Object Request Broaker Architecture The Object ManagementGroup (OMG) 3.Execute Client Client Proxy (StubCode) ORB Library 1.Locate Daemon Library Activate 2.Activate Skeleton Code Object Implementation ORB Library

9 CORBA Common Object Request Broaker Architecture The Object ManagementGroup (OMG) Client Object implementation Dynamic Invocation Interface IDL Stube ORB interface IDL Skeleton Dynamic Skeleton Interface Object Adaptor ORB Core

10 CORBA Common Object Request Broaker Architecture Příklad CORBA IDL: The Object ManagementGroup (OMG) #include "MISDefinitions.idl" module MISData { struct TstData { unsigned short opid; unsigned short roleid; ; interface TstDataIF { TstDef::TstResult GetTstData ( in unsigned short opid, out MISData::TstData data );

11 CORBA Common Object Request Broaker Architecture The Object ManagementGroup (OMG) Client Object implementation Dynamic Invocation Interface IDL Stube ORB interface IDL Skeleton Dynamic Skeleton Interface Object Adaptor ORB Core

12 CORBA Common Object Request Broaker Architecture The Object ManagementGroup (OMG) IIOP ORB Core ORB Core Internet Inter-ORB Protocol

13 Java RMI Remote Method Invocation IIOP Java RMI ORB Core

14 Java RMI Remote Method Invocation public class Client { public static void main(string[] args) { try { Registry registry = LocateRegistry.getRegistry("localhost", 1099); ServerExecutable exec = (ServerExecutable) registry.lookup("scitacka"); System.out.println("Client question: "); CLIENT System.out.println("Server answer: " + exec.add(15, 3)); catch(notboundexception ex) { System.err.println(ex); catch(remoteexception ex) { System.err.println(ex);

15 Java RMI Remote Method Invocation SPUŠTĚNÍ SERVERU public class Server { public static void main(string args[]) { try { ServerExecutable stub = (ServerExecutable) UnicastRemoteObject.exportObject (new ServerRemoteObject(), 0); Registry registry = LocateRegistry.createRegistry(1099); registry.rebind("rmi:///scitacka", stub); System.out.println("RMI Service is running."); catch(exception ex) { ex.printstacktrace(); return;

16 Java RMI Remote Method Invocation SERVER public class ServerRemoteObject extends UnicastRemoteObject implements ServerExecutable { public int add(int a, int b) throws RemoteException { return a + b; private static final long serialversionuid = 1L;

17 Java RMI Remote Method Invocation ServerExecutable <<interface>> ServerRemoteObject.class ServerRemoteObject rmic.exe ServerRemoteObject_Stub.class

18 Java RMI Remote Method Invocation ServerRemoteObject.class rmic.exe ServerRemoteObject_Stub.class

19 Java RMI Remote Method Invocation Client exec: ServerExecutable Toto je ve skutečnosti ServerRemote Object_Stub ServerRemoteObject add(3+5) add(3+5) 8 8 JVM 1 JVM 2

20 COM Component Object Model Interface Identifier např. {A46C12C0-4E88-11CE-A6F1-00AA0037DEFB GUID Global Unique Identifier GUIDGEN nástroj generující GUID IUnknown

21 COM IDL MIDL Deklarace interface (třída) RPC kód (DCOM)

22 COM IUnknown IClassFactory SumClassFactory IUnknown ISum SumClass IUnknown ISum SumClass

23 COM Class CFactory: public IClassFactory { public: // IUnknown AddRef(); Release(); QueryInterface(REFIIF, void**); // IClassFactory CreateInstance(IUnknown *, REFIID, void **); LockServer(BOOL); CFactory(): m_cref(1) {g_clocks++; CFactory() {g_clocks--; private: ULONG m_cref;

24 COM QueryInterface - reflexivnost IUnknown A B C

25 COM QueryInterface - symetrie IUnknown A B C

26 COM QueryInterface - transitivita IUnknown A B C

27 COM dědění na binární úrovni COM+ Agregace komponent: IUnknown IMultiply Aggregator IUnknown INoAggregationUnknown ISum Inside COM+

28 COM dědění na binární úrovni COM+ delegace komponent (containment): IUnknown IMultiply Container IUnknown ISum ISum Inside COM+

Sun Remote Procedure Call Mechanism

Sun Remote Procedure Call Mechanism Originally developed by Sun, but now widely available on other platforms (including Digital Unix). Also known as Open Network Computing (ONC). Sun RPC package has an