feat: Implementation of session facade design pattern #1278 (#3121)

* implementation of session facade #1278 * minor change * readme updated * addressed the comments regarding changing lists to maps and adding maven assembly plugin --------- Co-authored-by: Ilkka Seppälä <iluwatar@users.noreply.github.com>
2026-05-18 00:59:37 +00:00 · 2025-01-11 17:45:01 +02:00
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+/*
+ * 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.sessionfacade;
+
+
+import java.util.Map;
+import lombok.Getter;
+import lombok.extern.slf4j.Slf4j;
+
+/**
+ * The type Cart service.
+ * Represents the cart entity, has add to cart and remove from cart methods
+ */
+@Slf4j
+public class CartService {
+  /**
+   * -- GETTER --
+   *  Gets cart.
+   */
+  @Getter
+  private final Map<Integer, Product> cart;
+  private final Map<Integer, Product> productCatalog;
+
+  /**
+   * Instantiates a new Cart service.
+   *
+   * @param cart           the cart
+   * @param productCatalog the product catalog
+   */
+  public CartService(Map<Integer, Product> cart, Map<Integer, Product> productCatalog) {
+    this.cart = cart;
+    this.productCatalog = productCatalog;
+  }
+
+  /**
+   * Add to cart.
+   *
+   * @param productId the product id
+   */
+  public void addToCart(int productId) {
+    Product product = productCatalog.get(productId);
+    if (product != null) {
+      cart.put(productId, product);
+      LOGGER.info("{} successfully added to the cart", product);
+    } else {
+      LOGGER.info("No product is found in catalog with id {}", productId);
+    }
+  }
+
+  /**
+   * Remove from cart.
+   *
+   * @param productId the product id
+   */
+  public void removeFromCart(int productId) {
+    Product product = cart.remove(productId); // Remove product from cart
+    if (product != null) {
+      LOGGER.info("{} successfully removed from the cart", product);
+    } else {
+      LOGGER.info("No product is found in cart with id {}", productId);
+    }
+  }
+
+}