Preface – This post is part of the SAP Multi-Target Application (MTA) series.
Table of Contents
Introduction
A Multi-Target Application (SAP MTA) is a package comprised of multiple libraries, application and resource modules. These have been created using different technologies and deployed to different runtimes but have a common life-cycle. You can bundle different modules together, describe them along with their inter-dependencies to other modules, services, and interfaces, and package them in a Multi-Target Application(MTA) .
Technologies and Tools Involved in SAP MTA
| Tool/Technology | Purpose | Description |
| Hana Data Base | Store Business Data | This can be any database |
| Java/ Node.js | Add Business logic | In place of ABAP, business logic will be written here |
| UI5/Fiori | UI Design | Like convention Fiori Application, the UI will be developed in same uniform manner |
| SAP Cloud Foundry | MTA Deployment | The MTA application is deployed in to SAP Cloud Foundry as a mta.yaml file |
Default Project Layouts
| Files/Folders | Description |
| app/ | all your UI apps go in here; one or more of such in subfolders |
| srv/ | all your service definitions and implementations go in here |
| src/ | The default location in which you store your design-time database artifacts. If needed, you can create additional subfolders for the same purpose. |
| /package.json | your project descriptor, for example, listing dependencies |
| /mta.yaml | All the relevant dependencies of the module are defined in the MTA descriptor |
| srv/cat-service.js | A root file for all your custom event handlers |
| node_modules/ | All node modules sit here |
| node_modules/server.js | the main .js file (A root file for all your node calls under the Node Module folder) |
| node_modules/package.json | Add your corresponding description and dependencies of Node.js modules |
| node_modules/index.js | To maintain a catalogue of all the Node script files and share the same with one place for reference |
| lib/ | Created only if XSJS support is enabled for the module. Contains .xsjs (SAP HANA XS JavaScript) source files. |
| test/ | Created only if XSJS support is enabled for the module. Contains XSUnit test (.xsjslib) files. |
| tests/ | This folder is created for modules without XSJS support. It contains .js test files. |
Note: */ denotes a folder and /* signifies a file
Prerequisites and Restrictions
We need to consider the following limits for the SAP MTA deployment on SAP Cloud Foundry deploy service:
- Maximum size of the MTA archive: 4 GB
- Maximum size of MTA module content: 4 GB
- Maximum size of MTA resource content: 1 GB
- Maximum size of MTA descriptors (mtad.yaml and MANIFEST.MF): 1 MB
Best Practises related to SAP MTA:
- The MTA descriptor is built in the YAML format and has strict syntax requirements. You can edit the descriptor in the text-based code editor, but it is recommend to use the visual MTA editor because it provides input validation.
- Use the HTML5 Application Repository in a Multitarget Application as it enables to update the HTML5 applications without restarting the application router in the Cloud Foundry environment.
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