CORBA with J-Integra® Espresso

The IDL-to-C# language mapping used by J-Integra® Espresso is kept similar to OMG's standard IDL-to-Java language mapping, due to the conceptual similarities between C# and Java. Both languages support interfaces with multiple inheritances which require explicit implementation by classes. A Java or C# class, on the other hand, can only inherit from a single base class. It therefore seems obvious to identify CORBA interfaces with C# interfaces. As in Java, all administrative functions associated with an IDL interface are made available as part of an additional generated 'Helper' class.

The major difference between the Java and the C# language mapping is the absence of 'Holder' classes. C# allows for in/out parameters and call-by-reference as compared to Java. Therefore, C# does not need special containers for parameters passed by reference.

CORBA types are directly mapped to C# types as far as possible. But the language independent concept of the .NET framework allows the use of J-Integra® Espresso with any language supporting .NET. Examples using C++ and Visual Basic will be provided within this tutorial as well.

Contents

• Requirements
• Remarks
• Mappings for Basic Data Types
• Mappings for Complex Types

• First Steps
  • Hello - Getting started
  • HelloCpp - A 'Hello' using Visual C++ with CORBA
  • HelloVB - A 'Hello' using Visual Basic with CORBA
  • HelloNS - A 'Hello' using the CORBA Naming Service

• Language Mapping
  • Attribute - Using IDL Attributes
  • ListArrayStruc - Using IDL Sequences, Arrays & Structs
  • UniEnu - Using IDL Unions & Enums
  • Valuetype - Passing Objects by value using IDL valuetypes
  • Excep - Using CORBA User Exceptions
  • Any - Using CORBA Any's

• Common Patterns
  • EventService - Using the CORBA Event Service
  • Callback - Using Callbacks between CORBA Applications
  • Factory - Using Dynamic Creation of CORBA Objects

• Special Features
  • SSL - Using CORBA with the Secure Socket Layer
  • LongMsg - CORBA Performance with Massive Data Amount
  • Multithread - Demonstrating Multithreading within CORBA Servers
  • POA - Using Multiple POAs within one CORBA Server
  • Persistent - Using Persistent Server IORs

Requirements

• Microsoft .NET Framework 1.x or 2.x
• Add '[install dir]\bin\Jintegra.Espresso.dll' as a reference to your .NET projects

Remarks

• All the examples are located at '\Demo\<NameOfExample>'.
• Every example contains an IDL file at its root directory (except the SSL example, which is a mere extension of the basic 'Hello'), and two subdirectories containg the code for a client and for a server application. For your convenience, there are .NET project files available, too.

Mappings for Basic Data Types

OMG IDL	C#/.NET
boolean	bool
char	char
wchar	char
string	string
wstring	string
octet	byte
short	short
unsigned short	ushort
long	int
unsigned long	uint
long long	long
unsigned long long	ulong
float	float
double	double
long double	double