Utilisation du design pattern observer

panier/src/main/java/org/example/Accounting.java

@@ -1,6 +1,6 @@
 package org.example;
 
-public class Accounting {
+public class Accounting implements Observer<String> {
     private String accounting;
 
     public Accounting(String pAccounting) {

panier/src/main/java/org/example/Cart.java

@@ -1,14 +1,14 @@
 package org.example;
 
-public class Cart {
-    private StockManagement stock;
-    private Accounting accounting;
-    private String content;
+import java.util.ArrayList;
 
-    public Cart(StockManagement pStock, Accounting pAccounting) {
-        this.stock = pStock;
-        this.accounting = pAccounting;
-        this.content = new String ("Contenu du panier");
+public class Cart implements Observable<String> {
+    private String content;
+    private ArrayList<Observer<String>> observers;
+
+    public Cart() {
+        this.observers = new ArrayList<>();
+        this.content = "Contenu du panier";
     }
 
     public String getContent() {
@@ -16,7 +16,23 @@ public class Cart {
     }
 
     public void initiateOrder() {
-        this.stock.process(this.content);
-        this.accounting.process(this.content);
+        notifyObserver();
+    }
+
+    @Override
+    public void addObserver(Observer<String> obs) {
+        observers.add(obs);
+    }
+
+    @Override
+    public void removeObserver(Observer<String> obs) {
+        observers.remove(obs);
+    }
+
+    @Override
+    public void notifyObserver() {
+        for (Observer<String> obs : observers) {
+            obs.process(this.content);
+        }
     }
 }

panier/src/main/java/org/example/Observable.java

@@ -0,0 +1,7 @@
+package org.example;
+
+public interface Observable<T> {
+    public void addObserver(Observer<T> obs);
+    public void removeObserver(Observer<T> obs);
+    public void notifyObserver();
+}

panier/src/main/java/org/example/Observer.java

@@ -0,0 +1,5 @@
+package org.example;
+
+public interface Observer<T> {
+    public void process(T contenu);
+}

panier/src/main/java/org/example/StockManagement.java

@@ -1,6 +1,6 @@
 package org.example;
 
-public class StockManagement {
+public class StockManagement implements Observer<String> {
     private String stockManagement;
 
     public StockManagement(String pStockManagement) {

panier/src/test/java/org/example/CartTest.java

@@ -10,9 +10,7 @@ import static org.junit.jupiter.api.Assertions.*;
 class CartTest {
     @Test
     void testGetContenu() {
-        StockManagement stock = new StockManagement("Stock1");
-        Accounting compta = new Accounting("Compta1");
-        Cart cart = new Cart(stock, compta);
+        Cart cart = new Cart();
 
         assertEquals("Contenu du panier", cart.getContent());
     }
@@ -21,7 +19,10 @@ class CartTest {
     void testInitiateOrder() {
         StockManagement stock = new StockManagement("Stock1");
         Accounting compta = new Accounting("Compta1");
-        Cart cart = new Cart(stock, compta);
+        Cart cart = new Cart();
+
+        cart.addObserver(stock);
+        cart.addObserver(compta);
 
         ByteArrayOutputStream outContent = new ByteArrayOutputStream();
         System.setOut(new PrintStream(outContent));