Erlang -- The Orber Application

User's Guide
Reference Manual
Release Notes
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orber
User's Guide
Version 3.6.24

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Chapters

- The Orber Application
  - Top of chapter
  - Content Overview
  - Brief Description of the User's Guide
- Introduction to Orber
  - Top of chapter
  - Overview
- The Orber Application
  - Top of chapter
  - ORB Kernel and IIOP
  - The Object Request Broker (ORB)
  - Internet Inter-Object Protocol (IIOP)
- Interface Repository
  - Top of chapter
  - Interface Repository(IFR)
- Installing Orber
  - Top of chapter
  - Installation Process
  - Configuration
  - Firewall Configuration
  - Interface Configuration
- OMG IDL to Erlang Mapping
  - Top of chapter
  - OMG IDL to Erlang Mapping - Overview
  - OMG IDL Mapping Elements
  - Getting Started
  - Basic OMG IDL Types
  - Template OMG IDL Types and Complex Declarators
  - Constructed OMG IDL Types
  - Scoped Names and Generated Files
  - Typecode, Identity and Name Access Functions
  - References to Constants
  - References to Objects Defined in OMG IDL
  - Exceptions
  - Access to Attributes
  - Invocations of Operations
  - Implementing the DB Application
  - Reserved Compiler Names and Keywords
  - Type Code Representation
- CosNaming Service
  - Top of chapter
  - Overview of the CosNaming Service
  - The Basic Use-cases of the Naming Service
  - Interoperable Naming Service
- How to use security in Orber
  - Top of chapter
  - Security in Orber
- Orber Stubs/Skeletons
  - Top of chapter
  - Orber Stubs and Skeletons Description
- CORBA System and User Defined Exceptions
  - Top of chapter
  - System Exceptions
  - User Defined Exceptions
  - Throwing Exceptions
  - Catching Exceptions
- Orber Interceptors
  - Top of chapter
  - Using Interceptors
  - Interceptor Example
- OrberWeb
  - Top of chapter
  - Using OrberWeb
  - Starting OrberWeb
- Debugging
  - Top of chapter
  - Tools and FAQ

# 1 The Orber Application

### 1.1 Content Overview

The Orber documentation is divided into three sections:

- PART ONE - The User's Guide
  Description of the Orber Application including IDL-to-Erlang language mapping, services and a small tutorial demonstrating the development of a simple service.

- PART TWO - Release Notes
  A concise history of Orber.

- PART THREE - The Reference Manual
  A quick reference guide, including a brief description, to all the functions available in Orber.

### 1.2 Brief Description of the User's Guide

The User's Guide contains the following parts:

- ORB kernel and IIOP support

- Interface Repository

- IDL to Erlang mapping

- CosNaming Service

- Resolving initial reference from Java or C++

- Tutorial - creating a simple service

- CORBA Exceptions

- Interceptors

- OrberWeb

- Debugging

#### ORB Kernel and IIOP Support

The ORB kernel which has IIOP support will allow the creation of persistent server objects in Erlang. These objects can also be accessed via Erlang and Java environments. For the moment a Java enabled ORB is needed to generate Java from IDL to use Java server objects (this has been tested using OrbixWeb).

#### Interface Repository

The IFR is an interface repository used for some type-checking when coding/decoding IIOP. The IFR is capable of storing all interfaces and declarations of OMG IDL.

#### IDL to Erlang Mapping

The OMG IDL mapping for Erlang, which is necessary to access the functionality of Orber, is described, The mapping structure is included as the basic and the constructed OMG IDL types references, invocations and Erlang characteristics. An example is also provided.

#### CosNaming Service

Orber contains a CosNaming compliant service.

#### Resolving Initial References from Java or C++

A couple of classes are added to Orber to simplify initial reference access from Java or C++.

Resolving initial reference from Java
A class with only one method which returns an IORon the external string format to the INIT object (see "Interoperable Naming Service" specification).

Resolving initial reference from C++
A class (and header file) with only one method which returns an IOR on the external string format to the INIT object (see "Interoperable Naming Service" specification).

#### Orber Stub/Skeleton

An example which describes the API and behavior of Orber stubs and skeletons.

#### CORBA Exceptions

A listing of all system exceptions supported by Orber and how one should handle them. This chapter also describe how to generate user defined exceptions.

#### Interceptors

Descibes how to implement and activate interceptors.

#### OrberWeb

Offers the possibility to administrate and supervise Orber via a GUI.

#### Debugging

Describes how to use different tools when debugging and/or developing new applications using Orber. Also includes a FAQ, which deal with the most common mistakes when using Orber.