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Distributed Object Computing Using Java and CORBA

Distributed Object Computing Using Java and CORBA. Lesson 1: Introduction to CORBA. Objectives. Describe the role of CORBA in developing enterprise applications Describe the role of the Object Management Group Describe the CORBA architecture. CORBA Overview.

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Distributed Object Computing Using Java and CORBA

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  1. Distributed Object Computing Using Java and CORBA

  2. Lesson 1:Introduction to CORBA

  3. Objectives • Describe the role of CORBA in developing enterprise applications • Describe the role of the Object Management Group • Describe the CORBA architecture

  4. CORBAOverview • Common Object Request Broker Architecture • Object-oriented development • Distributed-object computing

  5. The ObjectManagement Group • Controls the CORBA standard • Provides a specification for CORBA

  6. CORBAArchitecture • Object Management Architecture • Object Request Broker • Object services • Common facilities • Application objects • Internet InterORB Protocol • Interface Definition Language • Object adapters • CORBA Services

  7. ObjectRequest Broker

  8. InternetInterORB Protocol

  9. InterfaceDefinition Language

  10. Summary • Describe the role of CORBA in developing enterprise applications • Describe the role of the Object Management Group • Describe the CORBA architecture

  11. Lesson 2:Interface Definition Language

  12. Objectives • Use the IDL to define the interface to CORBA objects • Describe the mapping of IDL nonclass data types into Java • Describe the purpose of IDL parameter-passing modes • Model inheritance using IDL • Define CORBA exceptions using IDL

  13. Introduction to IDL • IDL files • IDL compilers • Mapping IDL to Java

  14. Basicsof IDL • IDL constructs • Modules • Interfaces • Attributes • Operations

  15. IDLPrimitives

  16. Inheritance and IDL • Java  no multiple inheritance support • Java class  can inherit from only one other class • IDL  can be used to define an interface that inherits from multiple super-interfaces

  17. Constants Enumerations Unions Structures Type definitions Sequences Arrays NonclassData Types

  18. Parameter-PassingModes and Exceptions • Parameter-passing modes • in • out • inout • Exceptions • Use-defined exceptions inherit indirectly from java.lang.Exception • IDL operations must declare their ability to raise an exception

  19. Summary • Use the IDL to define the interface to CORBA objects • Describe the mapping of IDL nonclass data types into Java • Describe the purpose of IDL parameter-passing modes • Model inheritance using IDL • Define CORBA exceptions using IDL

  20. Lesson 3:Building CORBA Clients

  21. Objectives • Use the IDL compiler to generate client stubs • Initialize the ORB • Use the naming service to obtain an object reference • Invoke remote methods • Use out and inout parameters to invoke remote methods

  22. Client IDL Stubs • Used to create client applications • IDL-to-Java compiler named idlj • Used to compile IDL files to generate client stubs and server skeletons

  23. Initializing the ORB • The ORB class • Is used to initialize the ORB • Is not instantiated using its public constructor • Provides a static method named init that initializes the ORB and returns an instance of the ORB class

  24. Using theNaming Service • Connecting to the naming service • Using the naming service to obtain an object reference • Obtaining the initial naming context • Retrieving an object reference

  25. Example ofNamespace

  26. InvokingRemote Methods • Remote methods are invoked in the same way that local methods are invoked

  27. Using Out andInout Parameters • Out parameters • Used exclusively to return data from the server to the client • Inout parameters • Passed both from the client to the server and, following any changes, from the server back to the client

  28. Summary • Use the IDL compiler to generate client stubs • Initialize the ORB • Use the naming service to obtain an object reference • Invoke remote methods • Use out and inout parameters to invoke remote methods

  29. Lesson 4:Building CORBA Servers

  30. Objectives • Use the IDL compiler to generate server skeletons • Implement CORBA objects • Initialize the ORB and wait for clients • Use the naming service to publish an object reference • Use out and inout parameters

  31. ServerIDL Skeletons • A server skeleton provides a framework for the implementation of a CORBA object

  32. ImplementingCORBA Objects Server-side implementation

  33. Using theNaming Service • Instantiating a CORBA object • Creating additional naming contexts

  34. Example ofNaming Service

  35. Waitingfor Invocation • The wait method • Called to pause the main thread of execution • Part of Java’s built-in threading facilities

  36. Using Out andInout Parameters • Out parameters • Used exclusively to return data from the server to the client • Inout parameters • Passed both from the client to the server and, following any changes, from the server back to the client

  37. Summary • Use the IDL compiler to generate server skeletons • Implement CORBA objects • Initialize the ORB and wait for clients • Use the naming service to publish an object reference • Use out and inout parameters

  38. Lesson 5:Factory andCallback Objects

  39. Objectives • Describe the purpose of factory objects • Use factory objects to obtain object references • Describe the purpose of callback objects • Develop applications that use callback objects

  40. FactoryObjects • Types include: • Generic • Specific • In-process • Out-process • FactoryFinder • Using factory objects • Designing factory objects

  41. CallbackObjects • Using callback objects • Designing callback objects

  42. Summary • Describe the purpose of factory objects • Use factory objects to obtain object references • Describe the purpose of callback objects • Develop applications that use callback objects

  43. Lesson 6:CORBA Exceptions

  44. Objectives • Describe the purpose of CORBA exceptions • Define an exception using IDL • Develop CORBA objects that throw exceptions

  45. Introduction to CORBA Exceptions • Throwing CORBA exceptions • Catching CORBA exceptions

  46. Summary • Describe the purpose of CORBA exceptions • Define an exception using IDL • Develop CORBA objects that throw exceptions

  47. Lesson 7:DynamicInvocation Interface

  48. Objectives • Describe the purpose of the interface repository • Describe the Dynamic Invocation Interface • Construct an argument list for use in dynamic invocation • Invoke a request using the DII • Extract a return value following dynamic invocation

  49. Dynamic InvocationInterface Introduction • DII allows a client to access any CORBA object even though it may not have a client stub to provide a compile-time definition of an object’s interface

  50. Invoking a RemoteMethod Using DII • Construct a list of arguments • Prepare a place to hold a return value • Invoke the remote method • Extract the return value

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