@anglr/rest/es2022/src/middlewares/cache.middleware.js

Angular module representing rest services

import { isPresent } from '@jscrpt/common';
import { of, map } from 'rxjs';
/**
 * Middleware that is used for storing and restoring response from cache
 */
export class CacheMiddleware {
    //######################### public static properties #########################
    /**
     * String identification of middleware
     */
    static { this.id = 'CacheMiddleware'; }
    //######################### public methods - implementation of RestMiddleware #########################
    /**
     * Runs code that is defined for this rest middleware, in this method you can modify request and response
     * @param this - Method is bound to RESTClient
     * @param id - Unique id that identifies request method
     * @param target - Prototype of class that are decorators applied to
     * @param methodName - Name of method that is being modified
     * @param descriptor - Descriptor of method that is being modified
     * @param args - Array of arguments passed to called method
     * @param request - Http request that you can modify
     * @param next - Used for calling next middleware with modified request
     */
    run(_id, _target, _methodName, descriptor, _args, request, next) {
        if (!descriptor.getCachedResponse || !descriptor.saveResponseToCache) {
            return next(request);
        }
        const cachedResponse = descriptor.getCachedResponse(request);
        if (isPresent(cachedResponse)) {
            return of(cachedResponse);
        }
        return next(request).pipe(map(response => descriptor.saveResponseToCache(request, response)));
    }
}
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