Welcome
Developing
Developing EGL applications
Enterprise Generation Language (EGL) is a programming language that you can use to focus on business problems instead of software technologies. Within the Rational® development environment, you can use EGL wizards and other tools to write complex applications with minimal effort.
EGL Programmer's Guide
The EGL Programmer's Guide covers using EGL within the Eclipse Integrated Development Environment (IDE), as well as some of the common programming tasks that EGL developers perform.
Accessing data with EGL code
Message Queues and Topics
Subscribe and Reading from, and Publish to a TOPIC
Publish to a TOPIC with the EGL add statement; Subscribe and read with get next.

Overview
Getting started
Installing
Upgrading and migrating
EGL Code Accelerator for IBD
Developing
- Model driven development of EGL code
- Generating source code from UML models
  You can use transformations to create source code from a UML model. First you must create a transformation parameters file and then apply those parameters to a model.
- Generating the EGL Dependency Graph from EGL projects
- Generating Source Code from OpenAPI Documents
- Developing EGL applications
  Enterprise Generation Language (EGL) is a programming language that you can use to focus on business problems instead of software technologies. Within the Rational® development environment, you can use EGL wizards and other tools to write complex applications with minimal effort.
  - How to use this documentation
  - Additional information about EGL
    The most recent EGL documentation is in the IBM Business Developer documentation.
  - EGL Programmer's Guide
    The EGL Programmer's Guide covers using EGL within the Eclipse Integrated Development Environment (IDE), as well as some of the common programming tasks that EGL developers perform.
    - Introduction
      These topics explain the fundamentals of using EGL in the Eclipse IDE, as well as changes to the EGL language and IDE in this version.
    - Contents of an EGL application
      EGL applications contain projects, packages, folders, and files.
    - Properties
      Properties set specific options for parts. In general, you specify the properties when you create the part and then the properties are static. In certain circumstances, however, it is possible to change a property dynamically.
    - Annotating EGL Applications
      EGL developers can annotate their applications to indicate the version, authors as well as a general description.
    - Import and use statements
      Use the EGL import and use statements to expand the visibility of code elements.
    - Working with EGL code
    - Accessing data with EGL code
      - Common data access tasks
        You can use EGL to perform common data processing tasks such as reading and writing to files, without having to deal with implementation details.
      - SQL data
        SQL (pronounced as three separate letters) is a language that communicates with a relational database management system (DBMS), which in turn controls a database that maintains business information in interconnected tables.
      - DL/I data
      - Message Queues and Topics
        Defining resource associations for message queues
        You can define resource associations to specify default values for EGL programs that access message queues.
        Reading from and writing to message queues
        Write to message queues with the EGL add statement; read with get next.
        Subscribe and Reading from, and Publish to a TOPIC
        Publish to a TOPIC with the EGL add statement; Subscribe and read with get next.
        Using direct WebSphere® MQ API calls
        The WebSphere® MQ API is a set of program interfaces that you can use to request services from the message queue manager.
        Using linkage options for WebSphere® MQ run-time library selection
        Use an EGL linkage options part to indicate which runtime library you want to use.
        Connecting to WebSphere® MQ over TCP/IP
        You can connect to a WebSphere® MQ server from EGL-generated Java™ code or the debugger, by using only the WebSphere MQ .jar files, over a TCP/IP connection.
      - iSeries® objects
        EGL provides a library and Record definitions to communicate with data queues and data areas on the iSeries®.
      - Working with bidirectional data
    - Transfer of control across programs
    - Developing segmented programs in EGL
      Different runtime environments have different considerations for developing segmented programs.
    - Developing EGL programs for the IMS™ environment
    - Developing EGL programs for the CICS® environment
      There are specific design and development considerations when creating EGL programs for CICS® for z/OS® and CICS for VSE.
    - Developing EGL programs for the VSE environment
      IBM Business Developer provides a Generation for VSE feature that you can use to generate EGL as COBOL source for the z/VSE® environment.
    - Developing programs for iSeriesC
      You can deploy EGL-generated COBOL programs targeted for the IBM® i environment.
    - Overview of EGL Logging for Java Application
    - Overview of EGL Rich UI
    - Services: a top-level overview
      The topics in this section describe service-oriented architecture (SOA) and related technologies, EGL support for SOA, and service-related procedures, with an emphasis on service access. For details about deployment, see “Introduction to EGL generation and deployment” and “Add web-service deployment entries in the EGL deployment descriptor.”
    - Generating source code from UML models
      You can use transformations to create source code from a UML model. First you must create a transformation parameters file and then apply those parameters to a model.
    - Building EGL Text User Interface applications
      A Text UI application presents a text-based user interface similar to that of a 5250 or 3270 terminal.
    - Creating reports with EGL
      EGL offers different ways to create reports, using external engines to generate the report contents.
    - Working with web transaction applications in EGL
    - Debugging EGL applications
    - EGL Unit Testing
    - z/OS Connect
  - EGL Generation Guide
    The EGL Generation Guide covers the process of converting EGL code to Java™ or COBOL source code, including the processes and the files involved. This section is intended for a developer who will generate or deploy EGL applications.
  - EGL Language Reference
    The EGL Language Reference covers the fundamental use of the language, including its concepts, syntax, and keywords. This volume is intended for a developer writing EGL applications with some experience in procedural programming.
  - Rational® COBOL Runtime Guide for zSeries®
    This manual provides information about customizing and administering the IBM® Rational® COBOL Runtime.
  - IBM Business Developer EGL Server Guide for IBM® i
    This manual provides information about customizing and administering EGL Server for IBM® i on the host.
  - Generation for VSE Feature Reference
    This reference manual provides z/VSE-specific information about developing and generating EGL programs in the VSE environment.
- Source code analysis with code review
  With code review, you can create configurations of coding rules for EGL source code. You can then run the configurations to check the source code for consistency with the rules.
- Responsive Design Support in IBD
  What is Responsive Design? Responsive design is an approach for creation of web pages that automatically scales its content and elements to match the screen size on which it is viewed. So, instead of designing multiple websites for different devices with variable screen sizes, we can design just one website that scales up or down automatically, to match the device it’s being viewed on.
- Containerizing an EGL RUI Application
Samples
Troubleshooting and support
EGL runtime error messages
Reference
Glossary
Using the help
Notices for IBM Business Developer documentation

Subscribe and Reading from, and Publish to a TOPIC

Publish to a TOPIC with the EGL add statement; Subscribe and read with get next.

The first time you use an EGL statement with an MQ record during a program, EGL checks to see if there is an active connection to a queue manager. If not, it creates one.

Connecting to queue managers

You can connect to only one queue manager at a time in an EGL program.

EGL automatically connects to the queue manager on the first add or get next statement in a program, using the queue manager name specified in the system resource name associated with the message queue record. If the queue manager name is not specified in case of topic process, then it will not use the default queue manager defined for your system. EGL automatically disconnects from the queue manager when the program ends.

Publishing messages to topics

Publish messages to topics using the add statement with the message topic record as the I/O object. EGL performs the following actions:

Establishes the connection to the queue manager.
Opens the connection to the topic.
Publish the message on the topic.

Subscribing and Reading messages from Topic

Read messages from topic using the get next statement with the message topic record as the I/O object. When you use the get next statement, EGL performs the following actions:

Connects to the queue manager if the queue manager is not already connected.
Opens the queue if the queue is not already open.
Create Subscription durable or non-durable if needed. Otherwise resume with existing subscription.
Gets the next message from the Topic or TopicString. Can use wait interval to read the message.

EGL automatically closes the connection to the queue on program termination.

Committing or rolling back messages

When you combine messages in a transaction that defines a unit of work, the messages can be committed or rolled back as a group. When a unit of work is committed, everything included in the transaction is finalized. When a unit of work is rolled back, everything included in the transaction is removed.

Limitation on COBOL environment:

Topic doesn’t support commit or roll back.