1 files changed, 309 insertions, 0 deletions
diff --git a/qpid/java/broker/src/main/java/org/apache/qpid/server/txn/LocalTransaction.java b/qpid/java/broker/src/main/java/org/apache/qpid/server/txn/LocalTransaction.java
new file mode 100755
index 0000000000..946dbd7c28
--- /dev/null
+++ b/qpid/java/broker/src/main/java/org/apache/qpid/server/txn/LocalTransaction.java
@@ -0,0 +1,309 @@
+package org.apache.qpid.server.txn;
+/*
+ * 
+ * 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.
+ * 
+ */
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+
+import org.apache.qpid.AMQException;
+import org.apache.qpid.server.message.EnqueableMessage;
+import org.apache.qpid.server.message.ServerMessage;
+import org.apache.qpid.server.queue.BaseQueue;
+import org.apache.qpid.server.queue.QueueEntry;
+import org.apache.qpid.server.store.TransactionLog;
+import org.apache.qpid.server.queue.AMQQueue;
+import org.apache.qpid.server.queue.BaseQueue;
+import org.apache.qpid.server.queue.QueueEntry;
+import org.apache.qpid.server.store.TransactionLog;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * A concrete implementation of ServerTransaction where enqueue/dequeue
+ * operations share a single long-lived transaction.
+ * 
+ * The caller is responsible for invoking commit() (or rollback()) as necessary.
+ */
+public class LocalTransaction implements ServerTransaction
+{
+    protected static final Logger _logger = LoggerFactory.getLogger(LocalTransaction.class);
+
+    private final List<Action> _postTransactionActions = new ArrayList<Action>();
+
+    private volatile TransactionLog.Transaction _transaction;
+    private TransactionLog _transactionLog;
+    private long _txnStartTime = 0L;
+
+    public LocalTransaction(TransactionLog transactionLog)
+    {
+        _transactionLog = transactionLog;
+    }
+    
+    public boolean inTransaction()
+    {
+        return _transaction != null;
+    }
+    
+    public long getTransactionStartTime()
+    {
+        return _txnStartTime;
+    }
+
+    public void addPostTransactionAction(Action postTransactionAction)
+    {
+        _postTransactionActions.add(postTransactionAction);
+    }
+
+    public void dequeue(BaseQueue queue, EnqueableMessage message, Action postTransactionAction)
+    {
+        _postTransactionActions.add(postTransactionAction);
+
+        if(message.isPersistent() && queue.isDurable())
+        {
+            try
+            {
+                if (_logger.isDebugEnabled())
+                {
+                    _logger.debug("Dequeue of message number " + message.getMessageNumber() + " from transaction log. Queue : " + queue.getNameShortString());
+                }
+
+                beginTranIfNecessary();
+                _transaction.dequeueMessage(queue, message.getMessageNumber());
+
+            }
+            catch(AMQException e)
+            {
+                _logger.error("Error during message dequeues", e);
+                tidyUpOnError(e);
+            }
+        }
+    }
+
+    public void dequeue(Collection<QueueEntry> queueEntries, Action postTransactionAction)
+    {
+        _postTransactionActions.add(postTransactionAction);
+
+        try
+        {
+            for(QueueEntry entry : queueEntries)
+            {
+                ServerMessage message = entry.getMessage();
+                BaseQueue queue = entry.getQueue();
+
+                if(message.isPersistent() && queue.isDurable())
+                {
+                    if (_logger.isDebugEnabled())
+                    {
+                        _logger.debug("Dequeue of message number " + message.getMessageNumber() + " from transaction log. Queue : " + queue.getNameShortString());
+                    }
+
+                    beginTranIfNecessary();
+                    _transaction.dequeueMessage(queue, message.getMessageNumber());
+                }
+
+            }
+        }
+        catch(AMQException e)
+        {
+            _logger.error("Error during message dequeues", e);
+            tidyUpOnError(e);
+        }
+    }
+
+    private void tidyUpOnError(Exception e)
+    {
+        try
+        {
+            for(Action action : _postTransactionActions)
+            {
+                action.onRollback();
+            }
+        }
+        finally
+        {
+            try
+            {
+                if (_transaction != null)
+                {
+                    _transaction.abortTran();
+                }
+            }
+            catch (Exception abortException)
+            {
+                _logger.error("Abort transaction failed while trying to handle previous error", abortException);
+            }
+            finally
+            {
+		resetDetails();
+            }
+        }
+
+        throw new RuntimeException(e);
+    }
+
+    private void beginTranIfNecessary()
+    {
+
+        if(_transaction == null)
+        {
+            try
+            {
+                _transaction = _transactionLog.newTransaction();
+            }
+            catch (Exception e)
+            {
+                tidyUpOnError(e);
+            }
+        }
+    }
+
+    public void enqueue(BaseQueue queue, EnqueableMessage message, Action postTransactionAction)
+    {
+        _postTransactionActions.add(postTransactionAction);
+
+        if(message.isPersistent() && queue.isDurable())
+        {
+            try
+            {
+                if (_logger.isDebugEnabled())
+                {
+                    _logger.debug("Enqueue of message number " + message.getMessageNumber() + " to transaction log. Queue : " + queue.getNameShortString());
+                }
+                
+                beginTranIfNecessary();
+                _transaction.enqueueMessage(queue, message.getMessageNumber());
+            }
+            catch (Exception e)
+            {
+                _logger.error("Error during message enqueue", e);
+
+                tidyUpOnError(e);
+            }
+        }
+    }
+
+    public void enqueue(List<? extends BaseQueue> queues, EnqueableMessage message, Action postTransactionAction)
+    {
+        _postTransactionActions.add(postTransactionAction);
+
+        if (_txnStartTime == 0L)
+        {
+            _txnStartTime = System.currentTimeMillis();
+        }
+
+        if(message.isPersistent())
+        {
+            try
+            {
+                for(BaseQueue queue : queues)
+                {
+                    if(queue.isDurable())
+                    {
+                        if (_logger.isDebugEnabled())
+                        {
+                            _logger.debug("Enqueue of message number " + message.getMessageNumber() + " to transaction log. Queue : " + queue.getNameShortString() );
+                        }
+                        
+                        
+                        beginTranIfNecessary();
+                        _transaction.enqueueMessage(queue, message.getMessageNumber());
+                    }
+                }
+
+            }
+            catch (Exception e)
+            {
+                _logger.error("Error during message enqueue", e);
+
+                tidyUpOnError(e);
+            }
+        }
+    }
+
+    public void commit()
+    {
+        try
+        {
+            if(_transaction != null)
+            {
+                _transaction.commitTran();
+            }
+
+            for(Action action : _postTransactionActions)
+            {
+                action.postCommit();
+            }
+        }
+        catch (Exception e)
+        {
+            _logger.error("Failed to commit transaction", e);
+
+            for(Action action : _postTransactionActions)
+            {
+                action.onRollback();
+            }
+            throw new RuntimeException("Failed to commit transaction", e);
+        }
+        finally
+        {
+            resetDetails();
+        }
+    }
+
+    public void rollback()
+    {
+        try
+        {
+            if(_transaction != null)
+            {
+                _transaction.abortTran();
+            }
+        }
+        catch (AMQException e)
+        {
+            _logger.error("Failed to rollback transaction", e);
+            throw new RuntimeException("Failed to rollback transaction", e);
+        }
+        finally
+        {
+            try
+            {
+                for(Action action : _postTransactionActions)
+                {
+                    action.onRollback();
+                }
+            }
+            finally
+            {
+                resetDetails();
+            }
+        }
+    }
+    
+    private void resetDetails()
+    {
+        _transaction = null;
+	_postTransactionActions.clear();
+        _txnStartTime = 0L;
+    }
+}