import { promises as fs } from "fs";
import { join, dirname } from "path";
import { fileURLToPath } from "url";
// ES module equivalent of __dirname
const __filename = fileURLToPath(import.meta.url);
const __dirname = dirname(__filename);
// Configuration file paths - centralized constants
export const CONFIG_PATHS = {
AOT_STRUCTURE: join(__dirname, '..', 'config', 'd365-aot-structure.json'),
D365_MODEL_CONFIG: join(__dirname, '..', 'config', 'd365-model-config.json'),
D365_OBJECT_TEMPLATES: join(__dirname, '..', 'config', 'd365-object-templates.json')
} as const;
// Configuration cache for improved performance
class ConfigurationCache {
private cache = new Map<string, any>();
private loadPromises = new Map<string, Promise<any>>();
async loadConfig<T = any>(filePath: string): Promise<T> {
// Return cached result if available
if (this.cache.has(filePath)) {
return this.cache.get(filePath) as T;
}
// Return ongoing promise if file is being loaded
if (this.loadPromises.has(filePath)) {
return this.loadPromises.get(filePath) as Promise<T>;
}
// Start loading the file
const loadPromise = this.loadConfigFile<T>(filePath);
this.loadPromises.set(filePath, loadPromise);
try {
const result = await loadPromise;
this.cache.set(filePath, result);
return result;
} finally {
this.loadPromises.delete(filePath);
}
}
private async loadConfigFile<T = any>(filePath: string): Promise<T> {
try {
const content = await fs.readFile(filePath, 'utf-8');
return JSON.parse(content) as T;
} catch (error) {
throw new Error(`Failed to load configuration from ${filePath}: ${error}`);
}
}
clearCache(filePath?: string): void {
if (filePath) {
this.cache.delete(filePath);
this.loadPromises.delete(filePath);
} else {
this.cache.clear();
this.loadPromises.clear();
}
}
getCacheStatus(): { totalCached: number; currentlyLoading: number } {
return {
totalCached: this.cache.size,
currentlyLoading: this.loadPromises.size
};
}
}
// Singleton configuration loader instance
export const ConfigurationLoader = new ConfigurationCache();
// Convenience functions for specific config files
export const loadAOTStructure = <T = any>() => ConfigurationLoader.loadConfig<T>(CONFIG_PATHS.AOT_STRUCTURE);
export const loadD365ModelConfig = <T = any>() => ConfigurationLoader.loadConfig<T>(CONFIG_PATHS.D365_MODEL_CONFIG);
export const loadD365ObjectTemplates = <T = any>() => ConfigurationLoader.loadConfig<T>(CONFIG_PATHS.D365_OBJECT_TEMPLATES);
