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/*
* Copyright (c) 2022. Deutsche Telekom AG
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* SPDX-License-Identifier: Apache-2.0
*/
import { HttpRequest, HttpResponse } from '@angular/common/http';
import { Injectable } from '@angular/core';
const maxAge = 60000;
@Injectable({
providedIn: 'root',
})
// https://github.com/angular/angular/blob/master/aio/content/examples/http/src/app/request-cache.service.ts
export class RequestCacheService implements RequestCache {
// The cache is a Map of (most importantly but not exclusively) HttpResponses
cache = new Map<string, RequestCacheEntry>();
/**
* Get an http request from cache
* @param request the http request that should be retrieved from cache
*/
get(request: HttpRequest<any>): HttpResponse<any> | undefined {
const requestUrl = request.urlWithParams;
const cachedResponse = this.cache.get(requestUrl);
if (!cachedResponse) {
return undefined;
}
const isExpired = cachedResponse.lastRead < Date.now() - maxAge;
return isExpired ? undefined : cachedResponse.response;
}
/**
* Put a http response for a given request url (taken from the request object) in the cache
* @param request the http request that should be associated with the http response
* @param response the http response that should be stored in cache
*/
put(request: HttpRequest<any>, response: HttpResponse<any>): void {
const requestUrl = request.urlWithParams;
// Map a request url to an object
const newEntry = { requestUrl, response, lastRead: Date.now() };
this.cache.set(requestUrl, newEntry);
// Remove expired entries from the cache
const expired = Date.now() - maxAge;
this.cache.forEach(entry => {
if (entry.lastRead < expired) {
this.cache.delete(entry.requestUrl);
}
});
}
}
/**
* Service that manages the cache.
* `get()` HttpResponses from cache and `put()` responses into the cache
*/
export abstract class RequestCache {
abstract get(request: HttpRequest<any>): HttpResponse<any> | undefined;
abstract put(request: HttpRequest<any>, response: HttpResponse<any>): void;
}
/**
* Wrapper Object that stores the HttpResponse together with the `requestUrl` of the request and the `lastRead` time it was cached
*/
export interface RequestCacheEntry {
requestUrl: string;
response: HttpResponse<any>;
lastRead: number;
}
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