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MATRIXX Business API SDK
Creating Extensions
You create extensions using a Maven archetype and then add those extensions to the RS Gateway as JAR files.
Example Offer Purchase Extension Project
This section describes a project that creates a custom RS Gateway call that enhances offer purchasing. The project defines a custom offer purchase URL with a custom payload which returns balance impacts.
Creating the Offer Purchase Extension Class and Methods
In this section, you define the extension class using stubs to test the extension and update the REST service to use the Spring object manager.
Update the Class
In this task, you will change the DemoServices class to extend from JsonStubs.

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MATRIXX Business API SDK
- About MATRIXX Business API SDK
  MATRIXX Business API SDK provides the APIs, libraries, and other files needed to create a customized version of the RS Gateway.
- Business API SDK Overview
  The Business API SDK is a flexible framework that includes a set of tools to manage, customize and extend Rest Services Gateway (RS Gateway) for customer-specific business needs. Using the SDK, you can extend existing projects or create entirely new projects to add, replace, or modify services that leverage existing functionality.
- Business API Gateway
  The Business API Gateway is a development framework that includes the Business API SDK, Rest Services Gateway (RS Gateway), Gateway Proxy, and application tier. It allows custom mobile applications, web clients, and other custom implementations to integrate with MATRIXX.
- Creating Extensions
  You create extensions using a Maven archetype and then add those extensions to the RS Gateway as JAR files.
  - Installing and Initializing the SDK
    Before beginning RS Gateway extension development, you must install the MATRIXX dependencies in the local Maven repository. Use the provided installation script or do it manually.
  - Creating a Project
    After you install the SDK dependencies, create a project using the MATRIXX Extension Maven archetype.
  - Defining the Extension
    Creating an extension involves multiple steps, including defining custom MATRIXX Data Containers (MDCs) from MATRIXX Engine and RS Gateway in the Extensions module MDC files, defining the REST APIs, and defining the routing rules.
  - Testing Extensions
    During extension development, test your code at different stages.
  - Deploying the Extension
    Each extension module described in the discussion about creating an extension has a JAR file which you deploy to the RS Gateway pod.
  - Creating Multi-Request REST Services
    This section describes how to create new services that are an orderly set of atomic SubMan multi-requests.
  - Example Offer Purchase Extension Project
    This section describes a project that creates a custom RS Gateway call that enhances offer purchasing. The project defines a custom offer purchase URL with a custom payload which returns balance impacts.
    - Getting Started
      Before you begin, follow the instructions in the discussion about creating extensions to install and initialize the SDK and create a project.
    - Creating the Offer Purchase Custom MDCs
      In this section, you will create the custom MATRIXX Data Containers (MDCs) to hold the custom data.
    - Creating the Offer Purchase REST Service
      This section describes how to create the REST service that enables you to purchase a custom product offer.
    - Creating the Offer Purchase Extension Class and Methods
      In this section, you define the extension class using stubs to test the extension and update the REST service to use the Spring object manager.
      - Define the Extension Class
        In this task, you define the extension class and method stubs to test the custom REST call.
      - Test the Extension
        In this task, you build the purchase project and test the new REST service using a REST client. Testing requires a Gateway Proxy pointing to a running MATRIXX Engine.
      - Update the Class
        In this task, you will change the DemoServices class to extend from JsonStubs.
      - Add Helper Functions
        In this task, you will add two helper functions to query a subscriber and purchase an offer.
      - Change the Implementation Method
        In this task, you change the implementation method to query the subscriber before an offer purchase, purchase the offer, query the subscriber after the purchase, and add logging functions to help trace through the code.
      - Add Required Imports
        In this task, you must add the imports required in this sample extension.
    - Build and Deploy the Extension
      When the custom extension is complete, add it to the classpath and restart the RS Gateway.
  - Example REST Tax Service
    This section describes a project that implements a tax service.
- Creating Custom Filters
  You can create a custom filter by creating a named filter or a filter class. A named filter is useful for simple filters while a filter class should be used for complex filters (for example, when the returned results must be modified).
- Upgrading the Business API SDK
  When you upgrade the MATRIXX software, you must upgrade the Business API SDK as it is possible that files have changed or have been deprecated. Use the manage_integration_project.py script to remove the current release from your project directory structure and upgrade to the latest release. You should do this even if your files are not checked into Subversion.
- Appendixes
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MATRIXX Third-Party Licenses
Glossary

Update the Class

In this task, you will change the DemoServices class to extend from JsonStubs.

About this task

JsonStubs is a code generated class that initializes itself through the Spring Object Map bean factory. You will set up a logger to view the DemoServices class behavior in the log4j output when logging is enabled for this package.

Procedure

Edit the projects/purchase/rsgwextension/src/main/java/com/matrixx/rsgateway/configuration/DemoServices.java file.

In the first line, change the class declaration of DemoServices to extend JsonStubs. Then declare a logger, m_logger, which will be used later.

public class DemoServices extends JsonStubs {
  /**
    * logger for errors and warnings
    */
  private final Logger m_logger = LoggerFactory.getLogger(getClass());
  …
 	…
}

Save the file.