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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.
*/
/**
* \file TxnBuffer.cpp
*/
#include "TxnBuffer.h"
#include "AsyncResultHandle.h"
#include "AsyncStore.h"
#include "TxnAsyncContext.h"
#include "TxnOp.h"
#include "qpid/Exception.h"
#include <boost/shared_ptr.hpp>
namespace qpid {
namespace broker {
TxnBuffer::TxnBuffer(AsyncResultQueue& arq) :
m_store(0),
m_resultQueue(arq),
m_state(NONE)
{}
TxnBuffer::~TxnBuffer()
{}
void
TxnBuffer::enlist(boost::shared_ptr<TxnOp> op)
{
//std::cout << "TTT TxnBuffer::enlist" << std::endl << std::flush;
qpid::sys::ScopedLock<qpid::sys::Mutex> l(m_opsMutex);
m_ops.push_back(op);
}
bool
TxnBuffer::prepare(TxnHandle& th)
{
//std::cout << "TTT TxnBuffer::prepare" << std::endl << std::flush;
qpid::sys::ScopedLock<qpid::sys::Mutex> l(m_opsMutex);
for(std::vector<boost::shared_ptr<TxnOp> >::iterator i = m_ops.begin(); i != m_ops.end(); ++i) {
if (!(*i)->prepare(th)) {
return false;
}
}
return true;
}
void
TxnBuffer::commit()
{
//std::cout << "TTT TxnBuffer::commit" << std::endl << std::flush;
qpid::sys::ScopedLock<qpid::sys::Mutex> l(m_opsMutex);
for(std::vector<boost::shared_ptr<TxnOp> >::iterator i = m_ops.begin(); i != m_ops.end(); ++i) {
(*i)->commit();
}
m_ops.clear();
}
void
TxnBuffer::rollback()
{
//std::cout << "TTT TxnBuffer::rollback" << std::endl << std::flush;
qpid::sys::ScopedLock<qpid::sys::Mutex> l(m_opsMutex);
for(std::vector<boost::shared_ptr<TxnOp> >::iterator i = m_ops.begin(); i != m_ops.end(); ++i) {
(*i)->rollback();
}
m_ops.clear();
}
bool
TxnBuffer::commitLocal(AsyncTransactionalStore* const store)
{
//std::cout << "TTT TxnBuffer::commitLocal" << std::endl << std::flush;
if (store) {
try {
m_store = store;
asyncLocalCommit();
} catch (std::exception& e) {
std::cerr << "Commit failed: " << e.what() << std::endl;
} catch (...) {
std::cerr << "Commit failed (unknown exception)" << std::endl;
}
}
return false;
}
// static
void
TxnBuffer::handleAsyncResult(const AsyncResultHandle* const arh)
{
if (arh) {
boost::shared_ptr<TxnAsyncContext> tac = boost::dynamic_pointer_cast<TxnAsyncContext>(arh->getBrokerAsyncContext());
if (arh->getErrNo()) {
std::cerr << "Transaction xid=\"" << tac->getTransactionContext().getXid() << "\": Operation " << tac->getOpStr() << ": failure "
<< arh->getErrNo() << " (" << arh->getErrMsg() << ")" << std::endl;
tac->getTxnBuffer()->asyncLocalAbort();
} else {
//std::cout << "TTT TxnBuffer::handleAsyncResult() op=" << tac->getOpStr() << std::endl << std::flush;
if (tac->getOpCode() == qpid::asyncStore::AsyncOperation::TXN_ABORT) {
tac->getTxnBuffer()->asyncLocalAbort();
} else {
tac->getTxnBuffer()->asyncLocalCommit();
}
}
}
}
void
TxnBuffer::asyncLocalCommit()
{
assert(m_store != 0);
switch(m_state) {
case NONE:
//std::cout << "TTT TxnBuffer::asyncLocalCommit: NONE->PREPARE" << std::endl << std::flush;
m_state = PREPARE;
m_txnHandle = m_store->createTxnHandle(this);
prepare(m_txnHandle);
break;
case PREPARE:
//std::cout << "TTT TxnBuffer::asyncLocalCommit: PREPARE->COMMIT" << std::endl << std::flush;
m_state = COMMIT;
{
boost::shared_ptr<TxnAsyncContext> tac(new TxnAsyncContext(this,
m_txnHandle,
qpid::asyncStore::AsyncOperation::TXN_COMMIT,
&handleAsyncResult,
&m_resultQueue));
m_store->submitCommit(m_txnHandle, tac);
}
break;
case COMMIT:
//std::cout << "TTT TxnBuffer:asyncLocalCommit: COMMIT->COMPLETE" << std::endl << std::flush;
commit();
m_state = COMPLETE;
delete this; // TODO: ugly! Find a better way to handle the life cycle of this class
break;
// case COMPLETE:
//std::cout << "TTT TxnBuffer:asyncLocalCommit: COMPLETE" << std::endl << std::flush;
break;
default: ;
//std::cout << "TTT TxnBuffer:asyncLocalCommit: Unexpected state " << m_state << std::endl << std::flush;
}
}
void
TxnBuffer::asyncLocalAbort()
{
assert(m_store != 0);
switch (m_state) {
case NONE:
case PREPARE:
case COMMIT:
//std::cout << "TTT TxnBuffer::asyncRollback: xxx->ROLLBACK" << std::endl << std::flush;
m_state = ROLLBACK;
{
boost::shared_ptr<TxnAsyncContext> tac(new TxnAsyncContext(this,
m_txnHandle,
qpid::asyncStore::AsyncOperation::TXN_ABORT,
&handleAsyncResult,
&m_resultQueue));
m_store->submitCommit(m_txnHandle, tac);
}
break;
case ROLLBACK:
//std::cout << "TTT TxnBuffer:asyncRollback: ROLLBACK->COMPLETE" << std::endl << std::flush;
rollback();
m_state = COMPLETE;
delete this; // TODO: ugly! Find a better way to handle the life cycle of this class
default: ;
//std::cout << "TTT TxnBuffer:asyncRollback: Unexpected state " << m_state << std::endl << std::flush;
}
}
// for debugging
/*
void
TxnBuffer::printState(std::ostream& os)
{
os << "state=";
switch(m_state) {
case NONE: os << "NONE"; break;
case PREPARE: os << "PREPARE"; break;
case COMMIT: os << "COMMIT"; break;
case ROLLBACK: os << "ROLLBACK"; break;
case COMPLETE: os << "COMPLETE"; break;
default: os << m_state << "(unknown)";
}
os << "; " << m_ops.size() << "; store=" << m_store;
}
*/
}} // namespace qpid::broker
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