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12 CORBA Technology Projection
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CORBA Technology Projection
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CORBA is the old man among the distributed object middleware technologies used in today s IT world. CORBA stands for Common Object Request Broker Architecture. It defines distributed object middleware by its interfaces, their semantics and the protocols used for communication. The communication paradigm used adheres strongly to the client/server model. For the programming language in our examples, we use C++.
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A brief history of CORBA
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CORBA is represented by the OMG (Object Management Group), which is a consortium of over 600 companies, among them almost all big players in the IT world. An Object Request Broker (ORB) is the core of CORBA: what it is, and how it works, is described in this chapter. The OMG issues specifications that are in turn implemented by various ORB vendors. A series of Common Object Services exist around that core, such as the Naming Service, Event Service, Notification Service, and Logging Service. The first version of CORBA was finalized in 1991. Since then many ORBs have been implemented, both commercial and open-source ORBs. Since approximately 1998 an increasing number of open-source implementations, such as TAO, OmniORB, and JacORB have appeared. Today open-source and commercial ORBs, such as those from IONA and Borland, exist side by side. CORBA allows objects to be accessed in a distributed environment very similarly to the way in which they are accessed locally. Some explicit setup and configuration work is necessary, burdening the programmer, but also allowing full control of behavior. Component frameworks such as EJB [Sun04d] or CCM [Sev04] hide this code by doing all the set-up and configuration internally. CORBA is an important part of the J2EE standard every Java Development Kit
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CORBA Technology Projection (JDK) ships with CORBA support and a default implementation provided by Sun. CORBA has become a working tier inside modern component platforms, leading to people becoming oblivious to it, believing it to be outdated and no longer necessary in today s IT world. This view is incorrect, as CORBA is used as distributed object middleware within such component and integration platforms. In the past few years CORBA has gained increasing acceptance in distributed real-time and embedded systems development. In this, CORBA has followed the classic Technology Adoption Life Cycle [Rog95], in which successful systems eventually start to appeal to conservative users, because they become convinced over time that the technology is well proven, solid, and reliable. Real-time and embedded systems developers tend to be very conservative, so it s no surprise that it has taken this long for CORBA to appeal to them. Increases in available processing power and lower memory prices have also helped. In the past this domain used to rely on proprietary middleware, but now uses CORBA as standardized middleware. The OMG has tried to adapt to this domain explicitly with its Real-Time CORBA and Minimum CORBA specifications.
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CORBA pattern map
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The following diagram illustrates the use of the Remoting Patterns in this book when aligned to CORBA s architecture. Patterns that cover
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CORBA pattern map
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only dynamics, such as those in the Client Asynchrony or the Lifecycle Management chapters, are therefore not included.
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NamingService Naming Service
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Client LOOKUP
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Server Remote Object MARSHALLER Client Servant INVOCATION INTERCEPTOR INVOKER LOCAL OBJECT Skeleton POA POOLING LOCATION FORWARDER LIFECYCLE MANAGER CONFIGURATION GROUP ORBcore SERVER REQUEST HANDLER
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GLOBAL OBJECT REFERENCE (IOR) RepositoryID Profile(s) ObjectKey
ABSOLUTE OBJECT REFERENCE
OBJECT ID
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CORBA Technology Projection
An initial example with CORBA
As in many other distributed object middleware architectures, CORBA relies on interface specifications in separate files. The syntax used in those files is called IDL (Interface Definition Language). The following code snippet shows the IDL file of a simple example.
interface Foo { void bar (); };
An IDL compiler generates code from this, namely stubs and skeletons these are explained later in this chapter. The IDL compiler also generates an abstract class to be completed as the implementation of the remote object, the POA_Foo class in the example below. The following fragment of code represents one of the simplest possible server implementations for the above IDL interface.
#include "FooS.h" class Foo_Impl : public POA_Foo { void bar () { cout << "Hello world!" << endl; } } int main (int argc, char *argv[]) { CORBA::ORB_var orb = CORBA::ORB_init (argc, argv); CORBA::Object_var poa_obj = orb->resolve_initial_references ("RootPOA"); PortableServer::POA_var poa = PortableServer::POA::_narrow (poa_obj); Foo_Impl foo; poa->activate_object (&foo); PortableServer::POAManager_var poa_manager = poa->the_POAManager (); poa_manager->activate (); orb->run (); poa->destroy (1,0); // parameters are explained later orb->destroy (); }
The main routine contains the set-up and configuration information necessary to: Create and initialize the ORB (ORB_init) Create an object adapter (resolve_initial_references) Register the remote object implementation (activate_object)