1. Copyright © 2003 ProsoftTraining. All rights reserved. Distributed Object Computing Using Java and CORBA

2. Copyright © 2003 ProsoftTraining. All rights reserved. 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. CORBA Overview Common Object Request Broker Architecture Object-oriented development Distributed-object computing

5. The Object Management Group Controls the CORBA standard Provides a specification for CORBA

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

7. Object Request Broker

8. Internet InterORB Protocol

9. Interface Definition 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. Copyright © 2003 ProsoftTraining. All rights reserved. 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. Basics of IDL IDL constructs –Modules –Interfaces –Attributes –Operations

15. IDL Primitives IDLJava boolean char, wcharchar octetbyte string, wstringjava.lang.String short, unsigned shortshort long, unsigned longint long long, unsigned long longlong float double

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. Nonclass Data Types Constants Enumerations Unions Structures Type definitions Sequences Arrays

18. Parameter-Passing Modes 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. Copyright © 2003 ProsoftTraining. All rights reserved. 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 the Naming 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 of Namespace

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

27. Using Out and Inout 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. Copyright © 2003 ProsoftTraining. All rights reserved. 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. Server IDL Skeletons A server skeleton provides a framework for the implementation of a CORBA object

32. Implementing CORBA Objects Server-side implementation

33. Using the Naming Service Instantiating a CORBA object Creating additional naming contexts

34. Example of Naming Service

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

36. Using Out and Inout 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. Copyright © 2003 ProsoftTraining. All rights reserved. Lesson 5: Factory and Callback 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. Factory Objects Types include: –Generic –Specific –In-process –Out-process FactoryFinder Using factory objects Designing factory objects

41. Callback Objects 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. Copyright © 2003 ProsoftTraining. All rights reserved. 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. Copyright © 2003 ProsoftTraining. All rights reserved. Lesson 7: Dynamic Invocation 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 Invocation Interface 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 Remote Method Using DII Construct a list of arguments Prepare a place to hold a return value Invoke the remote method Extract the return value

51. Summary 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

52. Distributed Object Computing Using Java and CORBA Introduction to CORBA Interface Definition Language Building CORBA Clients Building CORBA Servers Factory and Callback Objects CORBA Exceptions Dynamic Invocation Interface