From 714003911f00d63be0d2ab23a6028005150f9840 Mon Sep 17 00:00:00 2001
From: Jesse Morgan <morganjm@amazon.com>
Date: Thu, 5 Mar 2015 15:09:26 -0800
Subject: Fixing leaked JDBC Connections.

Fixing a leak if aborting a transaction throws an exception (e.g. request made
on closed connection).
---
 .../carbonado/repo/jdbc/JDBCTransaction.java       | 15 +++++++----
 .../repo/jdbc/JDBCTransactionManager.java          | 30 +++++++++++++++-------
 2 files changed, 31 insertions(+), 14 deletions(-)

(limited to 'src/main/java/com/amazon/carbonado')

diff --git a/src/main/java/com/amazon/carbonado/repo/jdbc/JDBCTransaction.java b/src/main/java/com/amazon/carbonado/repo/jdbc/JDBCTransaction.java
index ffa2e5c..00e6947 100644
--- a/src/main/java/com/amazon/carbonado/repo/jdbc/JDBCTransaction.java
+++ b/src/main/java/com/amazon/carbonado/repo/jdbc/JDBCTransaction.java
@@ -106,10 +106,17 @@ class JDBCTransaction {
     }
 
     /**
-     * @return connection to close, or null if not ready to because this was a
-     * nested transaction
+     * @return true if the connection should be closed after the transaction is aborted.
      */
-    Connection abort() throws SQLException {
+    boolean shouldCloseConnection() {
+        return !mIsNested;
+    }
+
+    /**
+     * Note: The caller should close the connection after aborting if
+     * shouldCloseConnection() returns true.
+     */
+    void abort() throws SQLException {
         if (mRegisteredLobs != null) {
             for (JDBCLob lob : mRegisteredLobs) {
                 lob.close();
@@ -134,13 +141,11 @@ class JDBCTransaction {
                 }
             }
 
-            return null;
         } else {
             if (mReady) {
                 mConnection.rollback();
                 mReady = false;
             }
-            return mConnection;
         }
     }
 
diff --git a/src/main/java/com/amazon/carbonado/repo/jdbc/JDBCTransactionManager.java b/src/main/java/com/amazon/carbonado/repo/jdbc/JDBCTransactionManager.java
index c649058..9fe2ff4 100644
--- a/src/main/java/com/amazon/carbonado/repo/jdbc/JDBCTransactionManager.java
+++ b/src/main/java/com/amazon/carbonado/repo/jdbc/JDBCTransactionManager.java
@@ -97,18 +97,30 @@ class JDBCTransactionManager extends TransactionManager<JDBCTransaction> {
 
     @Override
     protected void abortTxn(JDBCTransaction txn) throws PersistException {
+        PersistException ex = null;
+
         try {
-            Connection con;
-            if ((con = txn.abort()) != null) {
-                JDBCRepository repo = mRepositoryRef.get();
-                if (repo == null) {
-                    con.close();
-                } else {
-                    repo.closeConnection(con);
+            txn.abort();
+        } catch (Throwable e) {
+            ex = mExTransformer.toPersistException(e);
+            throw ex;
+        } finally {
+            try {
+                if (txn.shouldCloseConnection()) {
+                    Connection con = txn.getConnection();
+                    JDBCRepository repo = mRepositoryRef.get();
+                    if (repo == null) {
+                        con.close();
+                    } else {
+                        repo.closeConnection(con);
+                    }
+                }
+            } catch (Throwable e) {
+                // Don't lose the original exception.
+                if (ex == null) {
+                    throw mExTransformer.toPersistException(e);
                 }
             }
-        } catch (Throwable e) {
-            throw mExTransformer.toPersistException(e);
         }
     }
 }
-- 
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