| /* |
| * |
| * 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 org.apache.qpid.server.txn; |
| |
| import org.apache.log4j.Logger; |
| |
| import org.apache.qpid.AMQException; |
| import org.apache.qpid.AMQStoreException; |
| 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.MessageStore; |
| import org.apache.qpid.server.store.MessageStore.StoreFuture; |
| |
| import java.util.Collection; |
| import java.util.List; |
| |
| /** |
| * An implementation of ServerTransaction where each enqueue/dequeue |
| * operation takes place within it own transaction. |
| * |
| * Since there is no long-lived transaction, the commit and rollback methods of |
| * this implementation are empty. |
| */ |
| public class AsyncAutoCommitTransaction implements ServerTransaction |
| { |
| protected static final Logger _logger = Logger.getLogger(AsyncAutoCommitTransaction.class); |
| |
| private final MessageStore _messageStore; |
| private final FutureRecorder _futureRecorder; |
| |
| public static interface FutureRecorder |
| { |
| public void recordFuture(StoreFuture future, Action action); |
| |
| } |
| |
| public AsyncAutoCommitTransaction(MessageStore transactionLog, FutureRecorder recorder) |
| { |
| _messageStore = transactionLog; |
| _futureRecorder = recorder; |
| } |
| |
| public long getTransactionStartTime() |
| { |
| return 0L; |
| } |
| |
| /** |
| * Since AutoCommitTransaction have no concept of a long lived transaction, any Actions registered |
| * by the caller are executed immediately. |
| */ |
| public void addPostTransactionAction(final Action immediateAction) |
| { |
| addFuture(MessageStore.IMMEDIATE_FUTURE, immediateAction); |
| |
| } |
| |
| public void dequeue(BaseQueue queue, EnqueableMessage message, Action postTransactionAction) |
| { |
| MessageStore.Transaction txn = null; |
| try |
| { |
| MessageStore.StoreFuture future; |
| if(message.isPersistent() && queue.isDurable()) |
| { |
| if (_logger.isDebugEnabled()) |
| { |
| _logger.debug("Dequeue of message number " + message.getMessageNumber() + " from transaction log. Queue : " + queue.getNameShortString()); |
| } |
| |
| txn = _messageStore.newTransaction(); |
| txn.dequeueMessage(queue, message); |
| future = txn.commitTranAsync(); |
| |
| txn = null; |
| } |
| else |
| { |
| future = MessageStore.IMMEDIATE_FUTURE; |
| } |
| addFuture(future, postTransactionAction); |
| postTransactionAction = null; |
| } |
| catch (AMQException e) |
| { |
| _logger.error("Error during message dequeue", e); |
| throw new RuntimeException("Error during message dequeue", e); |
| } |
| finally |
| { |
| rollbackIfNecessary(postTransactionAction, txn); |
| } |
| |
| } |
| |
| private void addFuture(final MessageStore.StoreFuture future, final Action action) |
| { |
| if(action != null) |
| { |
| if(future.isComplete()) |
| { |
| action.postCommit(); |
| } |
| else |
| { |
| _futureRecorder.recordFuture(future, action); |
| } |
| } |
| } |
| |
| public void dequeue(Collection<QueueEntry> queueEntries, Action postTransactionAction) |
| { |
| MessageStore.Transaction txn = null; |
| 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()); |
| } |
| |
| if(txn == null) |
| { |
| txn = _messageStore.newTransaction(); |
| } |
| |
| txn.dequeueMessage(queue, message); |
| } |
| |
| } |
| MessageStore.StoreFuture future; |
| if(txn != null) |
| { |
| future = txn.commitTranAsync(); |
| txn = null; |
| } |
| else |
| { |
| future = MessageStore.IMMEDIATE_FUTURE; |
| } |
| addFuture(future, postTransactionAction); |
| postTransactionAction = null; |
| } |
| catch (AMQException e) |
| { |
| _logger.error("Error during message dequeues", e); |
| throw new RuntimeException("Error during message dequeues", e); |
| } |
| finally |
| { |
| rollbackIfNecessary(postTransactionAction, txn); |
| } |
| |
| } |
| |
| |
| public void enqueue(BaseQueue queue, EnqueableMessage message, Action postTransactionAction) |
| { |
| MessageStore.Transaction txn = null; |
| try |
| { |
| MessageStore.StoreFuture future; |
| if(message.isPersistent() && queue.isDurable()) |
| { |
| if (_logger.isDebugEnabled()) |
| { |
| _logger.debug("Enqueue of message number " + message.getMessageNumber() + " to transaction log. Queue : " + queue.getNameShortString()); |
| } |
| |
| txn = _messageStore.newTransaction(); |
| txn.enqueueMessage(queue, message); |
| future = txn.commitTranAsync(); |
| txn = null; |
| } |
| else |
| { |
| future = MessageStore.IMMEDIATE_FUTURE; |
| } |
| addFuture(future, postTransactionAction); |
| postTransactionAction = null; |
| } |
| catch (AMQException e) |
| { |
| _logger.error("Error during message enqueue", e); |
| throw new RuntimeException("Error during message enqueue", e); |
| } |
| finally |
| { |
| rollbackIfNecessary(postTransactionAction, txn); |
| } |
| |
| |
| } |
| |
| public void enqueue(List<? extends BaseQueue> queues, EnqueableMessage message, Action postTransactionAction, long currentTime) |
| { |
| MessageStore.Transaction txn = null; |
| try |
| { |
| |
| if(message.isPersistent()) |
| { |
| for(BaseQueue queue : queues) |
| { |
| if (queue.isDurable()) |
| { |
| if (_logger.isDebugEnabled()) |
| { |
| _logger.debug("Enqueue of message number " + message.getMessageNumber() + " to transaction log. Queue : " + queue.getNameShortString()); |
| } |
| if (txn == null) |
| { |
| txn = _messageStore.newTransaction(); |
| } |
| |
| txn.enqueueMessage(queue, message); |
| |
| |
| } |
| } |
| |
| } |
| MessageStore.StoreFuture future; |
| if (txn != null) |
| { |
| future = txn.commitTranAsync(); |
| txn = null; |
| } |
| else |
| { |
| future = MessageStore.IMMEDIATE_FUTURE; |
| } |
| addFuture(future, postTransactionAction); |
| postTransactionAction = null; |
| |
| |
| } |
| catch (AMQException e) |
| { |
| _logger.error("Error during message enqueues", e); |
| throw new RuntimeException("Error during message enqueues", e); |
| } |
| finally |
| { |
| rollbackIfNecessary(postTransactionAction, txn); |
| } |
| |
| } |
| |
| |
| public void commit(final Runnable immediatePostTransactionAction) |
| { |
| if(immediatePostTransactionAction != null) |
| { |
| addFuture(MessageStore.IMMEDIATE_FUTURE, new Action() |
| { |
| public void postCommit() |
| { |
| immediatePostTransactionAction.run(); |
| } |
| |
| public void onRollback() |
| { |
| } |
| }); |
| } |
| } |
| |
| public void commit() |
| { |
| } |
| |
| public void rollback() |
| { |
| } |
| |
| public boolean isTransactional() |
| { |
| return false; |
| } |
| |
| private void rollbackIfNecessary(Action postTransactionAction, MessageStore.Transaction txn) |
| { |
| if (txn != null) |
| { |
| try |
| { |
| txn.abortTran(); |
| } |
| catch (AMQStoreException e) |
| { |
| _logger.error("Abort transaction failed", e); |
| // Deliberate decision not to re-throw this exception. Rationale: we can only reach here if a previous |
| // TransactionLog method has ended in Exception. If we were to re-throw here, we would prevent |
| // our caller from receiving the original exception (which is likely to be more revealing of the underlying error). |
| } |
| } |
| if (postTransactionAction != null) |
| { |
| postTransactionAction.onRollback(); |
| } |
| } |
| |
| } |