2.1: Integrate Component Definition Loading

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Background

In the previous epic, we created *.component.json files that contain crucial data for our application. However, these files are not being utilized yet. To unlock their full potential, we need to integrate the component definition loading process into our engine. This involves reading the *.component.json files, validating their structure, and registering the dataSchema part with the schema validation service, keyed by the component's ID.

Acceptance Criteria

To ensure that the component definition loading process is implemented correctly, we have established the following acceptance criteria:

1. Update or Create a Loader Service

The WorldLoader (or a new dedicated ComponentDefinitionLoader service) needs to be updated or created to handle the component definition loading process.

2. Scan Component Definition Directory

The loader service should scan the designated component definition directory (e.g., data/component_definitions/) to locate the *.component.json files.

3. Load and Validate Component Definitions

For each *.component.json file found, the loader service should:

  • Load the file using IDataFetcher.
  • Validate the loaded data against the component-definition.schema.json using ISchemaValidator. If validation fails, loading should fail.

4. Extract and Register Data Schema

The loader service should extract the component ID and dataSchema from the validated component definition. Then, it should register the data payload schema with ISchemaValidator using the addSchema method, keyed by the component's ID.

5. Store Component Definition Metadata (Optional)

If required, the loader service should store the component definition metadata in IDataRegistry.

6. Add Logging for Success and Failure Cases

The loader service should include logging for both successful and failed component definition loading cases.

Technology Suggestions

To implement the component definition loading process, we can utilize the following technologies:

1. JavaScript (ES Modules)

We can use JavaScript (ES Modules) as the programming language for the loader service.

2. Modify Existing WorldLoader or Create a New Class

We can either modify the existing WorldLoader or create a new class (ComponentDefinitionLoader) to handle the component definition loading process.

3. Utilize Injected Services

We can utilize the following injected services to implement the component definition loading process:

  • IDataFetcher: for loading the component definitions.
  • ISchemaValidator: for validating the loaded data against the schema.
  • IDataRegistry: for storing component definition metadata (if required).
  • ILogger: for logging success and failure cases.

Implementation

To implement the component definition loading process, we can follow these steps:

1. Create a New Class (ComponentDefinitionLoader)

We can create a new class (ComponentDefinitionLoader) that extends the WorldLoader class or implements the required interfaces.

2. Implement the LoadComponentDefinitions Method

We can implement the loadComponentDefinitions method in the ComponentDefinitionLoader class to scan the component definition directory, load the *.component.json files, and validate the loaded data against the schema.

3. Implement the RegisterDataSchema Method

We can implement the registerDataSchema method in the ComponentDefinitionLoader class to extract the component ID and dataSchema from the validated component definition and the data payload schema with ISchemaValidator.

4. Implement the StoreMetadata Method (Optional)

If required, we can implement the storeMetadata method in the ComponentDefinitionLoader class to store the component definition metadata in IDataRegistry.

5. Add Logging for Success and Failure Cases

We can add logging for both successful and failed component definition loading cases using the ILogger service.

Example Code

Here is an example code snippet that demonstrates how to implement the component definition loading process using the ComponentDefinitionLoader class:

import { IDataFetcher, ISchemaValidator, IDataRegistry, ILogger } from './services';
import { ComponentDefinition } from './models';

class ComponentDefinitionLoader {
  constructor(
    private dataFetcher: IDataFetcher,
    private schemaValidator: ISchemaValidator,
    private dataRegistry: IDataRegistry,
    private logger: ILogger
  ) {}

  async loadComponentDefinitions() {
    const componentDefinitions = await this.dataFetcher.fetchComponentDefinitions();
    for (const componentDefinition of componentDefinitions) {
      try {
        const validatedData = await this.schemaValidator.validate(componentDefinition);
        const componentId = validatedData.componentId;
        const dataSchema = validatedData.dataSchema;
        this.registerDataSchema(componentId, dataSchema);
        if (this.dataRegistry) {
          this.storeMetadata(componentDefinition);
        }
        this.logger.info(`Component definition loaded successfully: ${componentId}`);
      } catch (error) {
        this.logger.error(`Failed to load component definition: ${error.message}`);
      }
    }
  }

  private registerDataSchema(componentId: string, dataSchema: any) {
    this.schemaValidator.addSchema(dataSchema, componentId);
  }

  private storeMetadata(componentDefinition: ComponentDefinition) {
    this.dataRegistry.storeMetadata(componentDefinition);
  }
}

export { ComponentDefinitionLoader };

Frequently Asked Questions

In this section, we will address some of the most common questions related to the component definition loading process.

Q: What is the purpose of the component definition loading process?

A: The component definition loading process is responsible for reading the *.component.json files, validating their structure, and registering the dataSchema part with the schema validation service, keyed by the component's ID.

Q: Why is it necessary to validate the component definitions?

A: Validation is necessary to ensure that the component definitions conform to the expected schema, which helps prevent errors and inconsistencies in the application.

Q: What is the role of the ISchemaValidator service in the component definition loading process?

A: The ISchemaValidator service is responsible for validating the loaded data against the component-definition.schema.json schema. If validation fails, the loading process fails.

Q: How does the ComponentDefinitionLoader class handle component definition metadata?

A: The ComponentDefinitionLoader class can store component definition metadata in the IDataRegistry service, if required.

Q: What is the purpose of the ILogger service in the component definition loading process?

A: The ILogger service is responsible for logging success and failure cases during the component definition loading process.

Q: Can the component definition loading process be customized?

A: Yes, the component definition loading process can be customized by modifying the ComponentDefinitionLoader class or by injecting custom services.

Q: What are the benefits of using the component definition loading process?

A: The component definition loading process provides several benefits, including:

  • Improved data consistency and accuracy
  • Enhanced application reliability and stability
  • Simplified data management and maintenance
  • Improved scalability and performance

Q: How can I troubleshoot issues with the component definition loading process?

A: To troubleshoot issues with the component definition loading process, you can:

  • Check the application logs for error messages
  • Verify that the component definitions are correctly formatted and validated
  • Ensure that the ISchemaValidator service is correctly configured
  • Consult the application documentation and support resources

Q: Can I use the component definition loading process with other data formats?

A: Yes, the component definition loading process can be adapted to work with other data formats, such as JSON or XML.

Q: How can I extend the component definition loading process to support additional features?

A: To extend the component definition loading process, you can:

  • Modify the ComponentDefinitionLoader class to support additional features
  • Inject custom services to provide additional functionality
  • Use event-driven programming to handle custom events and notifications

Q: What are the best practices for implementing the component definition loading process?

A: To implement the component definition loading process effectively, follow these best practices:

  • Use a consistent and standardized approach to data loading and validation
  • Ensure that the component definitions are correctly formatted and validated
  • Use logging and to track application performance and errors
  • Regularly review and update the component definition loading process to ensure it remains relevant and effective.