From 470900c8bea7b3f9d13624433aa9da0f906c23a3 Mon Sep 17 00:00:00 2001
From: "Brian S. O'Neill" <bronee@gmail.com>
Date: Fri, 18 Jul 2008 01:56:53 +0000
Subject: Moved transaction support classes to txn package.

---
 .../com/amazon/carbonado/spi/TestCursorList.java   | 224 ---------------------
 .../carbonado/spi/TestTransactionManager.java      | 160 ---------------
 .../com/amazon/carbonado/txn/TestCursorList.java   | 224 +++++++++++++++++++++
 .../carbonado/txn/TestTransactionManager.java      | 160 +++++++++++++++
 4 files changed, 384 insertions(+), 384 deletions(-)
 delete mode 100644 src/test/java/com/amazon/carbonado/spi/TestCursorList.java
 delete mode 100644 src/test/java/com/amazon/carbonado/spi/TestTransactionManager.java
 create mode 100644 src/test/java/com/amazon/carbonado/txn/TestCursorList.java
 create mode 100644 src/test/java/com/amazon/carbonado/txn/TestTransactionManager.java

(limited to 'src')

diff --git a/src/test/java/com/amazon/carbonado/spi/TestCursorList.java b/src/test/java/com/amazon/carbonado/spi/TestCursorList.java
deleted file mode 100644
index afd04b7..0000000
--- a/src/test/java/com/amazon/carbonado/spi/TestCursorList.java
+++ /dev/null
@@ -1,224 +0,0 @@
-/*
- * Copyright 2006 Amazon Technologies, Inc. or its affiliates.
- * Amazon, Amazon.com and Carbonado are trademarks or registered trademarks
- * of Amazon Technologies, Inc. or its affiliates.  All rights reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.amazon.carbonado.spi;
-
-import com.amazon.carbonado.Cursor;
-
-import junit.framework.TestCase;
-import junit.framework.TestSuite;
-
-import com.amazon.carbonado.cursor.EmptyCursorFactory;
-
-/**
- * Test case for TransactionManager.CursorList.
- *
- * @author Brian S O'Neill
- */
-public class TestCursorList extends TestCase {
-    public static void main(String[] args) {
-        junit.textui.TestRunner.run(suite());
-    }
-
-    public static TestSuite suite() {
-        return new TestSuite(TestCursorList.class);
-    }
-
-    TransactionScope.CursorList mList;
-
-    public TestCursorList(String name) {
-        super(name);
-    }
-
-    protected void setUp() {
-       mList = new TransactionScope.CursorList();
-    }
-
-    public void testRegisterFew() {
-        assertEquals(0, mList.size());
-
-        {
-            Cursor cursor = EmptyCursorFactory.newEmptyCursor();
-            mList.register(cursor, null);
-            assertEquals(1, mList.size());
-            assertEquals(cursor, mList.getCursor(0));
-            assertEquals(null, mList.getValue(0));
-            Object value = mList.unregister(cursor);
-            assertEquals(0, mList.size());
-            assertEquals(null, value);
-        }
-
-        {
-            Cursor cursor_1 = EmptyCursorFactory.newEmptyCursor();
-            Cursor cursor_2 = EmptyCursorFactory.newEmptyCursor();
-            mList.register(cursor_1, null);
-            assertEquals(1, mList.size());
-            mList.register(cursor_2, null);
-            assertEquals(2, mList.size());
-            assertEquals(cursor_1, mList.getCursor(0));
-            assertEquals(cursor_2, mList.getCursor(1));
-            assertEquals(null, mList.getValue(0));
-            assertEquals(null, mList.getValue(1));
-
-            Object value = mList.unregister(cursor_2);
-            assertEquals(1, mList.size());
-            assertEquals(cursor_1, mList.getCursor(0));
-            assertEquals(null, value);
-            mList.unregister(cursor_2);
-            assertEquals(1, mList.size());
-            mList.unregister(cursor_1);
-            assertEquals(0, mList.size());
-        }
-
-        // unregister in reverse
-        {
-            Cursor cursor_1 = EmptyCursorFactory.newEmptyCursor();
-            Cursor cursor_2 = EmptyCursorFactory.newEmptyCursor();
-            mList.register(cursor_1, null);
-            mList.register(cursor_2, null);
-
-            mList.unregister(cursor_1);
-            assertEquals(1, mList.size());
-            assertEquals(cursor_2, mList.getCursor(0));
-
-            mList.unregister(cursor_1);
-            assertEquals(1, mList.size());
-            mList.unregister(cursor_2);
-            assertEquals(0, mList.size());
-        }
-    }
-
-    public void testRegisterFewValue() {
-        Cursor cursor_1 = EmptyCursorFactory.newEmptyCursor();
-        Cursor cursor_2 = EmptyCursorFactory.newEmptyCursor();
-        String value_1 = "1";
-        String value_2 = "2";
-
-        mList.register(cursor_1, value_1);
-        assertEquals(1, mList.size());
-        assertEquals(cursor_1, mList.getCursor(0));
-        assertEquals(value_1, mList.getValue(0));
-
-        mList.register(cursor_2, value_2);
-        assertEquals(2, mList.size());
-        assertEquals(cursor_1, mList.getCursor(0));
-        assertEquals(value_1, mList.getValue(0));
-        assertEquals(cursor_2, mList.getCursor(1));
-        assertEquals(value_2, mList.getValue(1));
-
-        Object value = mList.unregister(cursor_2);
-        assertEquals(1, mList.size());
-        assertEquals(cursor_1, mList.getCursor(0));
-        assertEquals(value_1, mList.getValue(0));
-        assertEquals(value_2, value);
-
-        value = mList.unregister(cursor_2);
-        assertEquals(1, mList.size());
-        assertEquals(null, value);
-        value = mList.unregister(cursor_1);
-        assertEquals(0, mList.size());
-        assertEquals(value_1, value);
-    }
-
-    // Tests that the array expands properly.
-    public void testRegisterMany() {
-        final int count = 50;
-        Cursor[] cursors = new Cursor[count];
-        for (int i=0; i<count; i++) {
-            cursors[i] = EmptyCursorFactory.newEmptyCursor();
-            mList.register(cursors[i], null);
-            assertEquals(i + 1, mList.size());
-        }
-
-        for (int i=0; i<count; i++) {
-            assertEquals(cursors[i], mList.getCursor(i));
-            assertEquals(null, mList.getValue(i));
-        }
-
-        for (int i=0; i<count; i++) {
-            mList.unregister(cursors[i]);
-            assertEquals(count - i - 1, mList.size());
-        }
-    }
-
-    // Tests that the arrays expand properly and store values.
-    public void testRegisterManyValues() {
-        final int count = 50;
-        Cursor[] cursors = new Cursor[count];
-        Integer[] values = new Integer[count];
-        for (int i=0; i<count; i++) {
-            cursors[i] = EmptyCursorFactory.newEmptyCursor();
-            values[i] = i;
-            mList.register(cursors[i], values[i]);
-            assertEquals(i + 1, mList.size());
-        }
-
-        for (int i=0; i<count; i++) {
-            assertEquals(cursors[i], mList.getCursor(i));
-            assertEquals(values[i], mList.getValue(i));
-        }
-
-        for (int i=0; i<count; i++) {
-            Object value = mList.unregister(cursors[i]);
-            assertEquals(count - i - 1, mList.size());
-            assertEquals(values[i], value);
-        }
-    }
-
-    public void testCloseCursors() throws Exception {
-        final int count = 50;
-
-        // Without values
-        {
-            Cursor[] cursors = new Cursor[count];
-            for (int i=0; i<count; i++) {
-                cursors[i] = EmptyCursorFactory.newEmptyCursor();
-                mList.register(cursors[i], null);
-            }
-
-            mList.closeCursors();
-            assertEquals(0, mList.size());
-
-            /*
-            for (int i=0; i<count; i++) {
-                assertEquals(true, cursors[i].isClosed());
-            }
-            */
-        }
-
-        // With values
-        {
-            Cursor[] cursors = new Cursor[count];
-            Integer[] values = new Integer[count];
-            for (int i=0; i<count; i++) {
-                cursors[i] = EmptyCursorFactory.newEmptyCursor();
-                values[i] = i;
-                mList.register(cursors[i], values[i]);
-            }
-
-            mList.closeCursors();
-            assertEquals(0, mList.size());
-
-            /*
-            for (int i=0; i<count; i++) {
-                assertEquals(true, cursors[i].isClosed());
-            }
-            */
-        }
-    }
-}
diff --git a/src/test/java/com/amazon/carbonado/spi/TestTransactionManager.java b/src/test/java/com/amazon/carbonado/spi/TestTransactionManager.java
deleted file mode 100644
index 1029a3d..0000000
--- a/src/test/java/com/amazon/carbonado/spi/TestTransactionManager.java
+++ /dev/null
@@ -1,160 +0,0 @@
-/*
- * Copyright 2008 Amazon Technologies, Inc. or its affiliates.
- * Amazon, Amazon.com and Carbonado are trademarks or registered trademarks
- * of Amazon Technologies, Inc. or its affiliates.  All rights reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.amazon.carbonado.spi;
-
-import java.util.concurrent.Callable;
-import java.util.concurrent.Executors;
-import java.util.concurrent.ExecutorService;
-
-import junit.framework.TestCase;
-import junit.framework.TestSuite;
-
-import com.amazon.carbonado.IsolationLevel;
-import com.amazon.carbonado.Transaction;
-
-/**
- * 
- *
- * @author Brian S O'Neill
- */
-public class TestTransactionManager extends TestCase {
-    public static void main(String[] args) {
-        junit.textui.TestRunner.run(suite());
-    }
-
-    public static TestSuite suite() {
-        return new TestSuite(TestTransactionManager.class);
-    }
-
-    TM mTxnMgr;
-
-    public TestTransactionManager(String name) {
-        super(name);
-    }
-
-    protected void setUp() {
-        mTxnMgr = new TM();
-    }
-
-    public void testAttachDetach() throws Exception {
-        Transaction txn = mTxnMgr.localScope().enter(null);
-
-        // This batch of tests just ensures no IllegalStateExceptions are thrown.
-        {
-            // Should do nothing.
-            txn.attach();
-            // Should detach.
-            txn.detach();
-            // Should do nothing.
-            txn.detach();
-            // Should attach.
-            txn.attach();
-        }
-
-        // Set up for multi-threaded tests.
-
-        ExecutorService es = Executors.newSingleThreadExecutor();
-
-        final Transaction txn2 = es.submit(new Callable<Transaction>() {
-            public Transaction call() {
-                return mTxnMgr.localScope().enter(null);
-            }
-        }).get();
-
-        try {
-            txn2.attach();
-            fail();
-        } catch (IllegalStateException e) {
-        }
-
-        try {
-            txn2.detach();
-            fail();
-        } catch (IllegalStateException e) {
-        }
-
-        txn.detach();
-
-        try {
-            txn2.attach();
-            fail();
-        } catch (IllegalStateException e) {
-        }
-
-        es.submit(new Runnable() {
-            public void run() {
-                txn2.detach();
-            }
-        }).get();
-
-        txn2.attach();
-        txn2.detach();
-        txn2.attach();
-
-        try {
-            txn.attach();
-            fail();
-        } catch (IllegalStateException e) {
-        }
-
-        txn.detach();
-
-        txn2.exit();
-
-        try {
-            txn.attach();
-            fail();
-        } catch (IllegalStateException e) {
-        }
-
-        txn.detach();
-
-        txn2.detach();
-
-        txn.detach();
-        txn.attach();
-        txn.detach();
-
-        es.shutdown();
-    }
-
-    private static class Txn {
-    }
-
-    private static class TM extends TransactionManager<Txn> {
-        protected IsolationLevel selectIsolationLevel(Transaction parent, IsolationLevel level) {
-            return IsolationLevel.READ_UNCOMMITTED;
-        }
-
-        protected boolean supportsForUpdate() {
-            return true;
-        }
-
-        protected Txn createTxn(Txn parent, IsolationLevel level) {
-            return new Txn();
-        }
-
-        protected boolean commitTxn(Txn txn) {
-            return false;
-        }
-
-        protected void abortTxn(Txn txn) {
-        }
-    }
-}
diff --git a/src/test/java/com/amazon/carbonado/txn/TestCursorList.java b/src/test/java/com/amazon/carbonado/txn/TestCursorList.java
new file mode 100644
index 0000000..ed2f04f
--- /dev/null
+++ b/src/test/java/com/amazon/carbonado/txn/TestCursorList.java
@@ -0,0 +1,224 @@
+/*
+ * Copyright 2006 Amazon Technologies, Inc. or its affiliates.
+ * Amazon, Amazon.com and Carbonado are trademarks or registered trademarks
+ * of Amazon Technologies, Inc. or its affiliates.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.amazon.carbonado.txn;
+
+import com.amazon.carbonado.Cursor;
+
+import junit.framework.TestCase;
+import junit.framework.TestSuite;
+
+import com.amazon.carbonado.cursor.EmptyCursorFactory;
+
+/**
+ * Test case for TransactionManager.CursorList.
+ *
+ * @author Brian S O'Neill
+ */
+public class TestCursorList extends TestCase {
+    public static void main(String[] args) {
+        junit.textui.TestRunner.run(suite());
+    }
+
+    public static TestSuite suite() {
+        return new TestSuite(TestCursorList.class);
+    }
+
+    TransactionScope.CursorList mList;
+
+    public TestCursorList(String name) {
+        super(name);
+    }
+
+    protected void setUp() {
+       mList = new TransactionScope.CursorList();
+    }
+
+    public void testRegisterFew() {
+        assertEquals(0, mList.size());
+
+        {
+            Cursor cursor = EmptyCursorFactory.newEmptyCursor();
+            mList.register(cursor, null);
+            assertEquals(1, mList.size());
+            assertEquals(cursor, mList.getCursor(0));
+            assertEquals(null, mList.getValue(0));
+            Object value = mList.unregister(cursor);
+            assertEquals(0, mList.size());
+            assertEquals(null, value);
+        }
+
+        {
+            Cursor cursor_1 = EmptyCursorFactory.newEmptyCursor();
+            Cursor cursor_2 = EmptyCursorFactory.newEmptyCursor();
+            mList.register(cursor_1, null);
+            assertEquals(1, mList.size());
+            mList.register(cursor_2, null);
+            assertEquals(2, mList.size());
+            assertEquals(cursor_1, mList.getCursor(0));
+            assertEquals(cursor_2, mList.getCursor(1));
+            assertEquals(null, mList.getValue(0));
+            assertEquals(null, mList.getValue(1));
+
+            Object value = mList.unregister(cursor_2);
+            assertEquals(1, mList.size());
+            assertEquals(cursor_1, mList.getCursor(0));
+            assertEquals(null, value);
+            mList.unregister(cursor_2);
+            assertEquals(1, mList.size());
+            mList.unregister(cursor_1);
+            assertEquals(0, mList.size());
+        }
+
+        // unregister in reverse
+        {
+            Cursor cursor_1 = EmptyCursorFactory.newEmptyCursor();
+            Cursor cursor_2 = EmptyCursorFactory.newEmptyCursor();
+            mList.register(cursor_1, null);
+            mList.register(cursor_2, null);
+
+            mList.unregister(cursor_1);
+            assertEquals(1, mList.size());
+            assertEquals(cursor_2, mList.getCursor(0));
+
+            mList.unregister(cursor_1);
+            assertEquals(1, mList.size());
+            mList.unregister(cursor_2);
+            assertEquals(0, mList.size());
+        }
+    }
+
+    public void testRegisterFewValue() {
+        Cursor cursor_1 = EmptyCursorFactory.newEmptyCursor();
+        Cursor cursor_2 = EmptyCursorFactory.newEmptyCursor();
+        String value_1 = "1";
+        String value_2 = "2";
+
+        mList.register(cursor_1, value_1);
+        assertEquals(1, mList.size());
+        assertEquals(cursor_1, mList.getCursor(0));
+        assertEquals(value_1, mList.getValue(0));
+
+        mList.register(cursor_2, value_2);
+        assertEquals(2, mList.size());
+        assertEquals(cursor_1, mList.getCursor(0));
+        assertEquals(value_1, mList.getValue(0));
+        assertEquals(cursor_2, mList.getCursor(1));
+        assertEquals(value_2, mList.getValue(1));
+
+        Object value = mList.unregister(cursor_2);
+        assertEquals(1, mList.size());
+        assertEquals(cursor_1, mList.getCursor(0));
+        assertEquals(value_1, mList.getValue(0));
+        assertEquals(value_2, value);
+
+        value = mList.unregister(cursor_2);
+        assertEquals(1, mList.size());
+        assertEquals(null, value);
+        value = mList.unregister(cursor_1);
+        assertEquals(0, mList.size());
+        assertEquals(value_1, value);
+    }
+
+    // Tests that the array expands properly.
+    public void testRegisterMany() {
+        final int count = 50;
+        Cursor[] cursors = new Cursor[count];
+        for (int i=0; i<count; i++) {
+            cursors[i] = EmptyCursorFactory.newEmptyCursor();
+            mList.register(cursors[i], null);
+            assertEquals(i + 1, mList.size());
+        }
+
+        for (int i=0; i<count; i++) {
+            assertEquals(cursors[i], mList.getCursor(i));
+            assertEquals(null, mList.getValue(i));
+        }
+
+        for (int i=0; i<count; i++) {
+            mList.unregister(cursors[i]);
+            assertEquals(count - i - 1, mList.size());
+        }
+    }
+
+    // Tests that the arrays expand properly and store values.
+    public void testRegisterManyValues() {
+        final int count = 50;
+        Cursor[] cursors = new Cursor[count];
+        Integer[] values = new Integer[count];
+        for (int i=0; i<count; i++) {
+            cursors[i] = EmptyCursorFactory.newEmptyCursor();
+            values[i] = i;
+            mList.register(cursors[i], values[i]);
+            assertEquals(i + 1, mList.size());
+        }
+
+        for (int i=0; i<count; i++) {
+            assertEquals(cursors[i], mList.getCursor(i));
+            assertEquals(values[i], mList.getValue(i));
+        }
+
+        for (int i=0; i<count; i++) {
+            Object value = mList.unregister(cursors[i]);
+            assertEquals(count - i - 1, mList.size());
+            assertEquals(values[i], value);
+        }
+    }
+
+    public void testCloseCursors() throws Exception {
+        final int count = 50;
+
+        // Without values
+        {
+            Cursor[] cursors = new Cursor[count];
+            for (int i=0; i<count; i++) {
+                cursors[i] = EmptyCursorFactory.newEmptyCursor();
+                mList.register(cursors[i], null);
+            }
+
+            mList.closeCursors();
+            assertEquals(0, mList.size());
+
+            /*
+            for (int i=0; i<count; i++) {
+                assertEquals(true, cursors[i].isClosed());
+            }
+            */
+        }
+
+        // With values
+        {
+            Cursor[] cursors = new Cursor[count];
+            Integer[] values = new Integer[count];
+            for (int i=0; i<count; i++) {
+                cursors[i] = EmptyCursorFactory.newEmptyCursor();
+                values[i] = i;
+                mList.register(cursors[i], values[i]);
+            }
+
+            mList.closeCursors();
+            assertEquals(0, mList.size());
+
+            /*
+            for (int i=0; i<count; i++) {
+                assertEquals(true, cursors[i].isClosed());
+            }
+            */
+        }
+    }
+}
diff --git a/src/test/java/com/amazon/carbonado/txn/TestTransactionManager.java b/src/test/java/com/amazon/carbonado/txn/TestTransactionManager.java
new file mode 100644
index 0000000..360a34d
--- /dev/null
+++ b/src/test/java/com/amazon/carbonado/txn/TestTransactionManager.java
@@ -0,0 +1,160 @@
+/*
+ * Copyright 2008 Amazon Technologies, Inc. or its affiliates.
+ * Amazon, Amazon.com and Carbonado are trademarks or registered trademarks
+ * of Amazon Technologies, Inc. or its affiliates.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.amazon.carbonado.txn;
+
+import java.util.concurrent.Callable;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ExecutorService;
+
+import junit.framework.TestCase;
+import junit.framework.TestSuite;
+
+import com.amazon.carbonado.IsolationLevel;
+import com.amazon.carbonado.Transaction;
+
+/**
+ * 
+ *
+ * @author Brian S O'Neill
+ */
+public class TestTransactionManager extends TestCase {
+    public static void main(String[] args) {
+        junit.textui.TestRunner.run(suite());
+    }
+
+    public static TestSuite suite() {
+        return new TestSuite(TestTransactionManager.class);
+    }
+
+    TM mTxnMgr;
+
+    public TestTransactionManager(String name) {
+        super(name);
+    }
+
+    protected void setUp() {
+        mTxnMgr = new TM();
+    }
+
+    public void testAttachDetach() throws Exception {
+        Transaction txn = mTxnMgr.localScope().enter(null);
+
+        // This batch of tests just ensures no IllegalStateExceptions are thrown.
+        {
+            // Should do nothing.
+            txn.attach();
+            // Should detach.
+            txn.detach();
+            // Should do nothing.
+            txn.detach();
+            // Should attach.
+            txn.attach();
+        }
+
+        // Set up for multi-threaded tests.
+
+        ExecutorService es = Executors.newSingleThreadExecutor();
+
+        final Transaction txn2 = es.submit(new Callable<Transaction>() {
+            public Transaction call() {
+                return mTxnMgr.localScope().enter(null);
+            }
+        }).get();
+
+        try {
+            txn2.attach();
+            fail();
+        } catch (IllegalStateException e) {
+        }
+
+        try {
+            txn2.detach();
+            fail();
+        } catch (IllegalStateException e) {
+        }
+
+        txn.detach();
+
+        try {
+            txn2.attach();
+            fail();
+        } catch (IllegalStateException e) {
+        }
+
+        es.submit(new Runnable() {
+            public void run() {
+                txn2.detach();
+            }
+        }).get();
+
+        txn2.attach();
+        txn2.detach();
+        txn2.attach();
+
+        try {
+            txn.attach();
+            fail();
+        } catch (IllegalStateException e) {
+        }
+
+        txn.detach();
+
+        txn2.exit();
+
+        try {
+            txn.attach();
+            fail();
+        } catch (IllegalStateException e) {
+        }
+
+        txn.detach();
+
+        txn2.detach();
+
+        txn.detach();
+        txn.attach();
+        txn.detach();
+
+        es.shutdown();
+    }
+
+    private static class Txn {
+    }
+
+    private static class TM extends TransactionManager<Txn> {
+        protected IsolationLevel selectIsolationLevel(Transaction parent, IsolationLevel level) {
+            return IsolationLevel.READ_UNCOMMITTED;
+        }
+
+        protected boolean supportsForUpdate() {
+            return true;
+        }
+
+        protected Txn createTxn(Txn parent, IsolationLevel level) {
+            return new Txn();
+        }
+
+        protected boolean commitTxn(Txn txn) {
+            return false;
+        }
+
+        protected void abortTxn(Txn txn) {
+        }
+    }
+}
-- 
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