Orbix 3: CORBA Development - Java Edition
Target Population: Designed for Java programmers with an interest in learning how to write distributed applications more productively, or those wishing to use Orbix 3.3 - Java Edition as a means of integrating existing applications.
Pre-requisites: Basic knowledge of the Java programming language is essential, as is some Object-Oriented software development experience. Some exposure to distributed system development is preferred.
Duration/Format: 4 days. An intensive course involving lectures, and hands-on exercises, delivered by an experienced OrbixWeb and Java programmer.
Course Objectives
On the completion of the course, the participants will be able to:
- Understand the goals and components of the CORBA standard, and the Orbix implementation in particular.
- Write simple applications in Orbix, and understand how Orbix combines with the use of object-oriented techniques to ease the writing and maintenance of distributed applications.
- Write interface definitions in CORBA IDL, and implement clients and servers that use and implement these interfaces.
- Handle errors when invoking operations on remote objects, and define, raise and handle application-specific exceptions.
- Understand the mapping from IDL to the Java programming language and how to approach implementing clients and servers efficiently.
- Install and manage servers in Orbix.
- Exploit inheritance in IDL definitions and implement these definitions in Java.
- Use the CORBA Naming Service to publish and locate CORBA Objects.
- Write smart proxies to improve efficiency or increase the richness of client-server interactions.
- Write loaders to automatically load and store object data to and from persistent storage.
- Write filters to monitor or control servers and/or objects.
Detailed Course Content
Introduction to CORBA
- Review of the recent history of distributed systems
- Current trends and challenges in distributed system design and development
- Explanation of CORBA's strengths and applicability in solving these problems
- Introduction to the overall vision of the Object Management Group and the CORBA standard
- Benefit of object-orientation to distributed systems
- Central role of interface definitions in a distributed system
- Overview of how distributed object references work in CORBA
OrbixWeb Architecture
- Introduction to Orbix concepts
- Structure of Orbix clients and servers
- Overview of a remote method invocation lifecycle
- Introduction to the orbixdj daemon
- Object location overview in an OrbixWeb system
Getting started
- Explanation of a simple client-server example with Orbix
- Discussion of which elements are automatically generated by Orbix, and which the application developer must write
- Overview of basic client usage of the ORB
- Discussion of the steps involved in implementing a basic Orbix server - implementing servants, writing a server mainline, and registering the server with the daemon
The Interface Definition Language
- Introduction to the syntax of the OMG Interface Definition Language (IDL), and its Java mapping
Implementing an interface
- Detailed discussion of how an IDL interface may be implemented in Java, comparing the inheritance (TIE) and delegation (ImplBase) approaches
Factory Objects
- Introduces the powerful Factory design pattern, and how it's best applied in IDL
- A discussion of which CORBA objects should be published, and which shouldn't
Implementing a Server
- Detailed explanation of how objects are created and managed by servers
- Discussion of how servers themselves can be registered and run
Exceptions
- Explanation of the mechanics and recommended approaches to defining, raising, and handling exceptions in a CORBA system
- CORBA system exceptions and application-defined exceptions are discussed
Naming Service
- The CORBA Naming Service provides a CORBA-compliant method of getting references to remote CORBA Objects
- Explanation of how the naming service maps human readable names to object references, and how clients look up objects based on their names
Filters
- Explanation of the motivation behind and the mechanics of filters in Orbix
- Filters are Java objects installed in a process' address space which hook in to the ORB's processing, permitting application code to be run when specific events (such as a remote method invocation) occur
Smart Proxies
- Discussion of Orbix smart proxies, which allow a programmer to customize the behavior of Orbix client proxy classes to optimize client performance
Loaders
- Detailed discussion of Orbix loaders, which support persistent object activation and deactivation
Orbix Code Generation Toolkit
- An explanation of the powerful code-generation toolkit (CGT), which is included with Orbix
- The CGT provides the automatic generation of working clients and servers, based on application-specific IDL; and, permits the development of additional scripts for custom code generation solutions
IIOP and ORB Interoperability
- Discussion of the Internet Inter-ORB Protocol (IIOP), which is used by ORB's to communicate
- Explanation of the contents of interoperable object references (IORs)
Configuring OrbixWeb
- Discussion of the Orbix configuration files and APIs
Callbacks
- Discussion of the callback pattern, where servers make invocations on clients' advantages and disadvantages of this approach
For registration information please contact your local representative:
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training-amer@iona.com |
training-emea@iona.com |
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