| 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; |
| } |
| } |