Merge pull request #8125 from eugenp/revert-8119-BAEL-3275-2

Revert "BAEL-3275: Using blocking queue for pub-sub"

spark-java/src/main/java/com/baeldung/sparkjava/UserServiceMapImpl.java

@@ -0,0 +1,68 @@
+package com.baeldung.sparkjava;
+
+import java.util.Collection;
+import java.util.HashMap;
+
+public class UserServiceMapImpl implements UserService {
+    private HashMap<String, User> userMap;
+
+    public UserServiceMapImpl() {
+        userMap = new HashMap<>();
+    }
+
+    @Override
+    public void addUser(User user) {
+        userMap.put(user.getId(), user);
+    }
+
+    @Override
+    public Collection<User> getUsers() {
+        return userMap.values();
+    }
+
+    @Override
+    public User getUser(String id) {
+        return userMap.get(id);
+    }
+
+    @Override
+    public User editUser(User forEdit) throws UserException {
+        try {
+            if (forEdit.getId() == null)
+                throw new UserException("ID cannot be blank");
+
+            User toEdit = userMap.get(forEdit.getId());
+
+            if (toEdit == null)
+                throw new UserException("User not found");
+
+            if (forEdit.getEmail() != null) {
+                toEdit.setEmail(forEdit.getEmail());
+            }
+            if (forEdit.getFirstName() != null) {
+                toEdit.setFirstName(forEdit.getFirstName());
+            }
+            if (forEdit.getLastName() != null) {
+                toEdit.setLastName(forEdit.getLastName());
+            }
+            if (forEdit.getId() != null) {
+                toEdit.setId(forEdit.getId());
+            }
+
+            return toEdit;
+        } catch (Exception ex) {
+            throw new UserException(ex.getMessage());
+        }
+    }
+
+    @Override
+    public void deleteUser(String id) {
+        userMap.remove(id);
+    }
+
+    @Override
+    public boolean userExist(String id) {
+        return userMap.containsKey(id);
+    }
+
+}