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/*
*
* 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.
*
*/
#include "qpid/broker/TxBuffer.h"
#include "qpid/broker/TransactionObserver.h"
#include "qpid/log/Statement.h"
#include "qpid/framing/reply_exceptions.h"
#include <boost/mem_fn.hpp>
#include <boost/bind.hpp>
namespace qpid {
namespace broker{
using boost::mem_fn;
using framing::InternalErrorException;
TxBuffer::TxBuffer() : observer(new NullTransactionObserver) {}
bool TxBuffer::prepare(TransactionContext* const ctxt)
{
// The observer may call startCompleter to delay completion.
if (!observer->prepare()) return false;
for(op_iterator i = ops.begin(); i != ops.end(); i++){
if(!(*i)->prepare(ctxt)) return false;
}
// At this point prepare has succeeded locally but if completion is delayed,
// then completing threads may call setError to indicate an error.
return true;
}
void TxBuffer::commit()
{
observer->commit();
std::for_each(ops.begin(), ops.end(), mem_fn(&TxOp::commit));
ops.clear();
}
void TxBuffer::rollback()
{
observer->rollback();
std::for_each(ops.begin(), ops.end(), mem_fn(&TxOp::rollback));
ops.clear();
}
void TxBuffer::enlist(TxOp::shared_ptr op)
{
op->callObserver(observer);
ops.push_back(op);
}
void TxBuffer::startCommit(TransactionalStore* const store)
{
if (!store) throw Exception("Can't commit transaction, no store.");
txContext.reset(store->begin().release());
if (!prepare(txContext.get()))
setError("Transaction prepare failed.");
}
// Called when async completion is complete.
std::string TxBuffer::endCommit(TransactionalStore* const store) {
std::string e;
{
sys::Mutex::ScopedLock l(errorLock);
e = error;
}
if (!e.empty()) {
store->abort(*txContext);
rollback();
throw InternalErrorException(e);
}
else {
store->commit(*txContext);
commit();
}
return std::string(); // There is no result from tx.commit
}
void TxBuffer::setError(const std::string& e) {
QPID_LOG(error, "Asynchronous transaction error: " << e);
sys::Mutex::ScopedLock l(errorLock);
if (!error.empty()) error += " ";
error += e;
}
}} // namespace qpid::broker
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