microservices-client-side-ui-composition/src/main/java/com/iluwatar/clientsideuicomposition/ApiGateway.java - master - githubmirror/java-design-patterns

microservices-client-side-ui-composition/src/main/java/com/iluwatar/clientsideuicomposition/ApiGateway.java

73 строки3 KB

Ilkka Seppälä

deps: Refactor dependencies (#3224)

29 мар 2025, 20:34

29 мар 2025, 20:340ca162a

/*
 * This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
 *
 * The MIT License
 * Copyright © 2014-2022 Ilkka Seppälä
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package com.iluwatar.clientsideuicomposition;

import java.util.HashMap;
import java.util.Map;

/**
 * ApiGateway class acts as a dynamic routing mechanism that forwards client requests to the
 * appropriate frontend components based on dynamically registered routes.
 *
 * <p>This allows for flexible, runtime-defined routing without hardcoding specific paths.
 */
public class ApiGateway {

  // A map to store routes dynamically, where the key is the path and the value
  // is the associated FrontendComponent
  private final Map<String, FrontendComponent> routes = new HashMap<>();

  /**
   * Registers a route dynamically at runtime.
   *
   * @param path the path to access the component (e.g., "/products")
   * @param component the frontend component to be accessed at the given path
   */
  public void registerRoute(String path, FrontendComponent component) {
    routes.put(path, component);
  }

  /**
   * Handles a client request by routing it to the appropriate frontend component.
   *
   * <p>This method dynamically handles parameters passed with the request, which allows the
   * frontend components to respond based on those parameters.
   *
   * @param path the path for which the request is made (e.g., "/products", "/cart")
   * @param params a map of parameters that might influence the data fetching logic (e.g., filters,
   *     userId, categories, etc.)
   * @return the data fetched from the appropriate component or "404 Not Found" if the path is not
   *     registered
   */
  public String handleRequest(String path, Map<String, String> params) {
    if (routes.containsKey(path)) {
      // Fetch data dynamically based on the provided parameters
      return routes.get(path).fetchData(params);
    } else {
      // Return a 404 error if the path is not registered
      return "404 Not Found";
    }
  }
}