@shipengine/connect-loader/lib/file-cache.js

Internal library for loading ShipEngine Connect apps

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.fileCache = void 0;
/**
 * Caches parsed file contents so the same file doesn't get read and parsed multiple times.
 * This also ensures that multiple references to the same file resolve to the same parsed obect instance.
 */
class FileCache {
    _cache = new Map();
    _loadsInProgress = 0;
    /**
     * Adds the given value to the cache
     */
    async add(filePath, promise) {
        if (this._cache.has(filePath)) {
            throw new ReferenceError(`Cache write error: ${filePath}`);
        }
        this._cache.set(filePath, promise);
        return promise;
    }
    /**
     * Gets the specified value from the cache, if it exists
     */
    get(filePath) {
        return this._cache.get(filePath);
    }
    /**
     * Lets the cache know that a ShipEngine Connect app is currently being loaded.
     * Be sure to call `finishedLoading()` afterward so the cache can be cleared to free-up memory.
     */
    startedLoading() {
        this._loadsInProgress++;
    }
    /**
     * Lets the cache know that a ShipEngine Connect app has finished loading.
     * The cache will be cleared to free-up memory.
     */
    finishedLoading() {
        this._loadsInProgress--;
        if (this._loadsInProgress <= 0) {
            this._loadsInProgress = 0;
            this._cache.clear();
        }
    }
}
/**
 * The singleton instance of the FileCache
 */
exports.fileCache = new FileCache();
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