corba & rmi

8/8/2019 CORBA & RMI

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Distributed Systems

CORBA Overview


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Copyright Karsten Schulz Terp-Nielsen

Object Model - remote object references

Persistent object references are implementedby usage of the Implementation Repository

IOR Host:port contains the Implementation

Repository server process informationImplementation Repository acts as a level ofindirection and delivers at runtime the addressof the POA server process to the client

Distributed Systems

CORBA Overview


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Object Model - remote object references

IOR Object Reference

IDL:MyObject Jupiter:8080

Server: TestHost:8888

OBJID:11

OBJID:12

POA1,OBJID:12

OBJID:13

Client

POA1

Pseudo-random number

Implementation Repository: Jupiter:8080

POA1 \bin\server\startPOA1 TestHost:8888

Distributed Systems

CORBA OverviewObj M d l P i R f l


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Object Model - Persistent Reference example

To make the Hello object referencespersistent you do the following

Create a new Policy

the LifeSpanPolicy equals persistent the IDAssignmentPolicy equals user_id

for all others default values are used

Create new POA associated withRooTManager with Policy the new policy

Create servant and explicit activate servant Example hello_imr

Distributed Systems

CORBA OverviewI bili A hi


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Interoperability Architecture

The Interoperability Architecture for CORBAcontain elements like

ORB interoperability

Inter-ORB bridge support GIOPs and IIOPs

An ORB is considered being interoperabilitycompliant when supporting

GIOP/IIOP IOR

Distributed Systems

CORBA OverviewL g g M i g


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Language Mappings

The following language specific OMG IDLcompilers are contained in specifications

ADA

C

C++

Java

Smalltalk

CORBA Script

COBOL

LISP

Phyton

Client Server

ADA

C

C++

Java

Smalltalk

CORBA Script

COBOL

LISP

Phyton

Distributed Systems

CORBA OverviewLanguage Mappings cross language example


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Language Mappings - cross language example

To show CORBA is language independentuse the IDL2CPP compiler on hello.idl togenerate a interface and a stub

idl --no-skeletons hello.idl

Make a client.cpp implementation and link itto a client.exe

Start the Java ORB based hello server andstart the C++ ORB based hello client

Distributed Systems

J2SE 1.4 support for CORBA


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pp

Distributed Systems

J2SE 1.4 support for CORBACORBA compliance


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CORBA compliance

JDK 1.4 contains a Java ORBimplementation supporting CORBAspecification 2.3.1

JDK 1.4 contains the following CORBA tools IDL-to-Java compiler (idlj) Implementation Repository (orbd) transient Naming Service (orbd)

persistent Naming Service (orbd) servertool (cmd line interface tool) tnamesrv (backward compability)

Distributed Systems

J2SE 1.4 support for CORBACORBA features


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CORBA features

GIOP 1.2 (IIOP)POA

Portable interceptors

provides hooks, or interception points,through which ORB services can interceptthe normal flow of execution of the ORB

three typesIORInterceptor

ClientRequestInterceptorServerRequestInterceptor

Distributed Systems

J2SE 1.4 support for CORBACORBA features


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CORBA features

The class ORBInitializer facilitates interceptorregistration and ORB initialization

done through properties

org.omg.PortableInterceptor.ORBInitializerClass.

where is the string name of a classwhich implements

org.omg.PortableInterceptor.ORBInitializer

Interoperable Naming Service can use corba urls

Distributed Systems

J2SE 1.4 support for CORBACORBA example


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CORBA example

Example of using persistent object referencesand the implementation repository in J2SE 1.4(javacorba\exservertool)

start the orbd (startorbd)

start the server tool (servertool -ORBInitialPort 1050) register HelloServer and start it up start the client (startclient)

every 6 seconds the client class the sayHello() on the

remote object and shutdown the serverwatch in Taskmanager how the server is automaticallystarted up when its shutdown by the client

Distributed Systems

Next TimeCORBA Part II


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Java Language Mapping

Corba Communication Models

Naming Services

CORBA Naming Service

CORBA Event Service

CORBA Transaction Service

CORBA 3.0 - Whats up?
http://www.daneprairie.com/


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