refactor: 이미 존재하는 Key일 경우 먼저 예외 발생하도록 리팩토링

woowacourse · Oct 11, 2023 · 0cde77e · 0cde77e
1 parent 9ea5497
commit 0cde77e
Showing 1 changed file with 3 additions and 2 deletions.
diff --git a/.../main/java/org/springframework/transaction/support/TransactionSynchronizationManager.java b/.../main/java/org/springframework/transaction/support/TransactionSynchronizationManager.java
@@ -26,10 +26,11 @@ public static void bindResource(DataSource key, Connection value) {
             resources.set(connectionMap);
         }
 
-        Connection mappedConnection = connectionMap.put(key, value);
-        if (mappedConnection != null) {
+        if (connectionMap.containsKey(key)) {
             throw new IllegalStateException("fail to bind resource because of already exist bound thread");
         }
+
+        connectionMap.put(key, value);
     }
 
     public static Connection unbindResource(DataSource key) {