Add unit tests for Transaction

framework/db/src/com/cloud/utils/db/Transaction.java

@@ -27,7 +27,12 @@ public class Transaction {
 
     public static <T> T execute(TransactionCallback<T> callback) {
         String name = "tx-" + counter.incrementAndGet();
-        TransactionLegacy txn = TransactionLegacy.open(name);
+        short databaseId = TransactionLegacy.CLOUD_DB;
+        TransactionLegacy currentTxn = TransactionLegacy.currentTxn(false);
+        if ( currentTxn != null ) {
+            databaseId = currentTxn.getDatabaseId();
+        }
+        TransactionLegacy txn = TransactionLegacy.open(name, databaseId, false);
         try {
             txn.start();
             T result = callback.doInTransaction(STATUS);

framework/db/src/com/cloud/utils/db/TransactionLegacy.java

@@ -117,10 +117,16 @@ public class TransactionLegacy {
     private TransactionLegacy _prev = null;
 
     public static TransactionLegacy currentTxn() {
+        return currentTxn(true);
+    }
+    
+    protected static TransactionLegacy currentTxn(boolean check) {
         TransactionLegacy txn = tls.get();
+        if (check) {
             assert txn != null : "No Transaction on stack.  Did you mark the method with @DB?";
     
-        assert checkAnnotation(3, txn) : "Did you even read the guide to use Transaction...IOW...other people's code? Try method can't be private.  What about @DB? hmmm... could that be it? " + txn;
+            assert checkAnnotation(4, txn) : "Did you even read the guide to use Transaction...IOW...other people's code? Try method can't be private.  What about @DB? hmmm... could that be it? " + txn;
+        }
         return txn;
     }
 
@@ -397,6 +403,10 @@ public class TransactionLegacy {
         return lockMaster.release(name);
     }
 
+    /**
+     * @deprecated Use {@link Transaction} for new code
+     */
+    @Deprecated
     public void start() {
         if (s_logger.isTraceEnabled()) {
             s_logger.trace("txn: start requested by: " + buildName());
@@ -1171,4 +1181,12 @@ public class TransactionLegacy {
            /* connectionPool */poolableConnectionFactory.getPool());
     }
 
+    /**
+     * Used for unit testing primarily
+     * 
+     * @param conn
+     */
+    protected void setConnection(Connection conn) {
+        this._conn = conn;
+    }
 }

framework/db/test/com/cloud/utils/db/TestTransaction.java

@@ -0,0 +1,136 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.cloud.utils.db;
+
+import static org.junit.Assert.*;
+import static org.mockito.Mockito.*;
+
+import java.io.FileNotFoundException;
+import java.sql.Connection;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.mockito.Mockito;
+
+public class TestTransaction {
+
+    TransactionLegacy txn;
+    Connection conn;
+
+    @Before
+    public void setup() {
+        setup(TransactionLegacy.CLOUD_DB);
+    }
+
+    public void setup(short db) {
+        txn = TransactionLegacy.open(db);
+        conn = Mockito.mock(Connection.class);
+        txn.setConnection(conn);
+    }
+
+    @After
+    public void after() {
+        TransactionLegacy.currentTxn().close();
+    }
+
+    @Test
+    public void testCommit() throws Exception {
+        assertEquals(42L, Transaction.execute(new TransactionCallback<Object>() {
+            @Override
+            public Object doInTransaction(TransactionStatus status) {
+                return 42L;
+            }
+        }));
+
+        verify(conn).setAutoCommit(false);
+        verify(conn, times(1)).commit();
+        verify(conn, times(0)).rollback();
+        verify(conn, times(1)).close();
+    }
+
+    @Test
+    public void testRollback() throws Exception {
+        try {
+            Transaction.execute(new TransactionCallback<Object>() {
+                @Override
+                public Object doInTransaction(TransactionStatus status) {
+                    throw new RuntimeException("Panic!");
+                }
+            });
+            fail();
+        } catch (RuntimeException e) {
+            assertEquals("Panic!", e.getMessage());
+        }
+        
+        verify(conn).setAutoCommit(false);
+        verify(conn, times(0)).commit();
+        verify(conn, times(1)).rollback();
+        verify(conn, times(1)).close();
+    }
+    
+    @Test
+    public void testRollbackWithException() throws Exception {
+        try {
+            Transaction.executeWithException(new TransactionCallbackWithException<Object>() {
+                @Override
+                public Object doInTransaction(TransactionStatus status) throws FileNotFoundException {
+                    assertEquals(TransactionLegacy.CLOUD_DB, TransactionLegacy.currentTxn().getDatabaseId().shortValue());
+
+                    throw new FileNotFoundException("Panic!");
+                }
+            }, FileNotFoundException.class);
+            fail();
+        } catch (FileNotFoundException e) {
+            assertEquals("Panic!", e.getMessage());
+        }
+        
+        verify(conn).setAutoCommit(false);
+        verify(conn, times(0)).commit();
+        verify(conn, times(1)).rollback();
+        verify(conn, times(1)).close();
+    }
+    
+    @Test
+    public void testOtherdatabaseRollback() throws Exception {
+        after();
+        setup(TransactionLegacy.AWSAPI_DB);
+
+        try {
+            Transaction.execute(new TransactionCallbackNoReturn() {
+                @Override
+                public void doInTransactionWithoutResult(TransactionStatus status) {
+                    assertEquals(TransactionLegacy.AWSAPI_DB, TransactionLegacy.currentTxn().getDatabaseId().shortValue());
+                    
+                    throw new RuntimeException("Panic!");
+                }
+            });
+            fail();
+        } catch (RuntimeException e) {
+            assertEquals("Panic!", e.getMessage());
+        }
+        
+        
+        verify(conn).setAutoCommit(false);
+        verify(conn, times(0)).commit();
+        verify(conn, times(1)).rollback();
+        verify(conn, times(1)).close();
+    }
+
+}

framework/db/test/db.properties

@@ -0,0 +1,18 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you 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.
+
+# Just here to make the unit test not blow up

utils/test/com/cloud/utils/exception/ExceptionUtilTest.java

@@ -0,0 +1,48 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.cloud.utils.exception;
+
+import static org.junit.Assert.*;
+
+import java.io.FileNotFoundException;
+import java.io.IOException;
+
+import org.junit.Test;
+
+public class ExceptionUtilTest {
+
+    @Test
+    public void test() throws Exception {
+        FileNotFoundException fnfe = new FileNotFoundException();
+        try {
+            ExceptionUtil.rethrow(fnfe, IOException.class);
+            fail();
+        } catch (IOException e) {
+        }
+
+        ExceptionUtil.rethrow(fnfe, ClassNotFoundException.class);
+        
+        try {
+            ExceptionUtil.rethrow(fnfe, FileNotFoundException.class);
+            fail();
+        } catch ( FileNotFoundException e ) {
+        }
+    }
+
+}