From 146e46fb5a19dcd236ccf6be62c90de3bc356795 Mon Sep 17 00:00:00 2001
From: "Brian S. O'Neill" <bronee@gmail.com>
Date: Fri, 18 Jul 2008 22:13:15 +0000
Subject: Make sure JDBCCursor registers and unregisters with transaction,
 ensuring it gets closed on transaction commit.

---
 .../java/com/amazon/carbonado/repo/jdbc/JDBCCursor.java     |  7 +++++++
 .../java/com/amazon/carbonado/repo/jdbc/JDBCStorage.java    | 13 ++++++++-----
 2 files changed, 15 insertions(+), 5 deletions(-)

(limited to 'src')

diff --git a/src/main/java/com/amazon/carbonado/repo/jdbc/JDBCCursor.java b/src/main/java/com/amazon/carbonado/repo/jdbc/JDBCCursor.java
index 4f31d2c..585b29a 100644
--- a/src/main/java/com/amazon/carbonado/repo/jdbc/JDBCCursor.java
+++ b/src/main/java/com/amazon/carbonado/repo/jdbc/JDBCCursor.java
@@ -28,6 +28,8 @@ import com.amazon.carbonado.FetchException;
 import com.amazon.carbonado.Storable;
 import com.amazon.carbonado.cursor.AbstractCursor;
 
+import com.amazon.carbonado.txn.TransactionScope;
+
 /**
  * Cursor implementation that queries a PreparedStatement.
  *
@@ -35,6 +37,7 @@ import com.amazon.carbonado.cursor.AbstractCursor;
  */
 class JDBCCursor<S extends Storable> extends AbstractCursor<S> {
     private final JDBCStorage<S> mStorage;
+    private final TransactionScope<JDBCTransaction> mScope;
     private final Connection mConnection;
     private final PreparedStatement mStatement;
 
@@ -46,19 +49,23 @@ class JDBCCursor<S extends Storable> extends AbstractCursor<S> {
      * up when this happens by closing statement and connection.
      */
     JDBCCursor(JDBCStorage<S> storage,
+               TransactionScope<JDBCTransaction> scope,
                Connection con,
                PreparedStatement statement)
         throws SQLException
     {
         mStorage = storage;
+        mScope = scope;
         mConnection = con;
         mStatement = statement;
         mResultSet = statement.executeQuery();
+        scope.register(storage.getStorableType(), this);
     }
 
     public void close() throws FetchException {
         if (mResultSet != null) {
             try {
+                mScope.unregister(mStorage.getStorableType(), this);
                 mResultSet.close();
                 mStatement.close();
                 mStorage.mRepository.yieldConnection(mConnection);
diff --git a/src/main/java/com/amazon/carbonado/repo/jdbc/JDBCStorage.java b/src/main/java/com/amazon/carbonado/repo/jdbc/JDBCStorage.java
index cc9bef9..cbd4fc0 100644
--- a/src/main/java/com/amazon/carbonado/repo/jdbc/JDBCStorage.java
+++ b/src/main/java/com/amazon/carbonado/repo/jdbc/JDBCStorage.java
@@ -68,6 +68,7 @@ import com.amazon.carbonado.qe.StandardQuery;
 import com.amazon.carbonado.qe.StandardQueryFactory;
 import com.amazon.carbonado.sequence.SequenceValueProducer;
 import com.amazon.carbonado.spi.TriggerManager;
+import com.amazon.carbonado.txn.TransactionScope;
 import com.amazon.carbonado.util.QuickConstructorGenerator;
 
 /**
@@ -644,7 +645,8 @@ class JDBCStorage<S extends Storable> extends StandardQueryFactory<S>
         }
 
         public Cursor<S> fetch(FilterValues<S> values) throws FetchException {
-            boolean forUpdate = mRepository.localTransactionScope().isForUpdate();
+            TransactionScope<JDBCTransaction> scope = mRepository.localTransactionScope();
+            boolean forUpdate = scope.isForUpdate();
             Connection con = getConnection();
             try {
                 PreparedStatement ps = con.prepareStatement(prepareSelect(values, forUpdate));
@@ -655,7 +657,7 @@ class JDBCStorage<S extends Storable> extends StandardQueryFactory<S>
 
                 try {
                     setParameters(ps, values);
-                    return new JDBCCursor<S>(JDBCStorage.this, con, ps);
+                    return new JDBCCursor<S>(JDBCStorage.this, scope, con, ps);
                 } catch (Exception e) {
                     // in case of exception, close statement
                     try {
@@ -713,7 +715,8 @@ class JDBCStorage<S extends Storable> extends StandardQueryFactory<S>
                 break;
             }
 
-            if (mRepository.localTransactionScope().isForUpdate()) {
+            TransactionScope<JDBCTransaction> scope = mRepository.localTransactionScope();
+            if (scope.isForUpdate()) {
                 select = select.concat(" FOR UPDATE");
             }
 
@@ -733,7 +736,7 @@ class JDBCStorage<S extends Storable> extends StandardQueryFactory<S>
                             switch (option) {
                             case OFFSET_ONLY:
                                 ps.setLong(psOrdinal, from);
-                                Cursor<S> c = new JDBCCursor<S>(JDBCStorage.this, con, ps);
+                                Cursor<S> c = new JDBCCursor<S>(JDBCStorage.this, scope, con, ps);
                                 return new LimitCursor<S>(c, to - from);
                             case LIMIT_AND_OFFSET:
                                 ps.setLong(psOrdinal, to - from);
@@ -755,7 +758,7 @@ class JDBCStorage<S extends Storable> extends StandardQueryFactory<S>
                         ps.setLong(psOrdinal, to);
                     }
 
-                    return new JDBCCursor<S>(JDBCStorage.this, con, ps);
+                    return new JDBCCursor<S>(JDBCStorage.this, scope, con, ps);
                 } catch (Exception e) {
                     // in case of exception, close statement
                     try {
-- 
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