JavaScript

Overview:

In the context of the codbex platform, JavaScript files (*.js and *.mjs) play a crucial role in defining the logic and behavior associated with various artifacts, such as jobs, listeners, websockets, and more. These files contain server-side scripts written in JavaScript, and they are executed within the runtime environment.

Here's an overview of their usage:

TIP

File extensions: *.js, *.mjs

Common Characteristics and Usage:

Server-Side Scripts as RESTful Services

One of the main use cases for JavaScript in the platform is to write server-side scripts that can be exposed as RESTful services. This allows developers to build custom web services that can be easily consumed by external clients, providing a flexible and extensible way to interact with the platform.

Example:

import { response } from "sdk/http";

response.println("Hello World!");

Example for HTTP RESTful services framework:

import { rs } from "sdk/http";

rs.service()
    .resource("")
    .get(function (_ctx, _request, response) {
        response.println("Hello there!");
    })
    .execute();

Benefits:

• Custom Functionality: JavaScript allows developers to implement custom business logic, data processing, and data retrieval within the RESTful service. Integration Capabilities:
• RESTful services written in JavaScript can easily integrate with other platform artifacts, such as tables and views, providing a seamless development experience.
• Data Transformation: JavaScript scripts can perform data transformation and enrichment before sending responses to clients.
• Flexible Routing: Developers have the flexibility to define custom endpoints and route requests based on specific requirements.

Job Handlers:

• For jobs defined in *.job files, JavaScript files are used to define the job handler. This script contains the logic to be executed when the job runs.

Example:

console.log("Executing custom logic for My Job");

Listener Handlers:

• For listeners defined in *.listener files, JavaScript files are used to define the listener handler. This script contains logic to handle events triggered by the listener.

Example:

exports.onMessage = function(message) {
	console.log(message);
}

exports.onError = function(error) {
	console.error(error);
}

Best Practices:

Modularization:

Consider modularizing your JavaScript code for better maintainability and organization, especially when dealing with complex logic.

Error Handling:

Implement error handling within your JavaScript files to gracefully handle unexpected scenarios.

Logging:

Use logging statements (e.g., console.log) for debugging and monitoring the execution of your scripts.

Reuse Code:

Encapsulate reusable logic in functions or modules to promote code reuse.

Conclusion:

JavaScript files in the platform provide a powerful mechanism to define custom server-side logic associated with various artifacts. They enable developers to extend and customize the behavior of the platform based on specific business requirements.