JavaScript
File extensions:
*.js
,*.mjs
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:
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.