Implement asynchronous user request processing and caching

src/main/java/mate/academy/AsyncRequestProcessor.java

@@ -1,16 +1,37 @@
 package mate.academy;
 
+import java.util.Map;
 import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.Executor;
 
 public class AsyncRequestProcessor {
     private final Executor executor;
+    private final Map<String, UserData> cache = new ConcurrentHashMap<>();
 
     public AsyncRequestProcessor(Executor executor) {
         this.executor = executor;
     }
 
     public CompletableFuture<UserData> processRequest(String userId) {
-        return null;
+        UserData userData = cache.get(userId);
+        if (userData != null) {
+            return CompletableFuture.completedFuture(userData);
+        }
+
+        return CompletableFuture.supplyAsync(
+                () -> cache.computeIfAbsent(userId, this::processUserData),
+                executor
+        );
+    }
+
+    private UserData processUserData(String userId) {
+        try {
+            Thread.sleep(1000); // Simulate processing delay
+        } catch (InterruptedException e) {
+            Thread.currentThread().interrupt();
+            throw new RuntimeException(e);
+        }
+        return new UserData(userId, "Details for " + userId);
     }
 }

src/main/java/mate/academy/Main.java

@@ -2,11 +2,12 @@
 
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
 
 public class Main {
     public static void main(String[] args) {
         // Feel free to play with AsyncRequestProcessor in this main method if you want
-        ExecutorService executor = null; // Provide implementation that fits your needs
+        ExecutorService executor = Executors.newFixedThreadPool(5);
         AsyncRequestProcessor asyncRequestProcessor = new AsyncRequestProcessor(executor);
 
         // Simulating multiple concurrent requests