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// **********************************************************************
//
// Copyright (c) 2003-2010 ZeroC, Inc. All rights reserved.
//
// This copy of Ice is licensed to you under the terms described in the
// ICE_LICENSE file included in this distribution.
//
// **********************************************************************
#include <Freeze/TransactionI.h>
#include <Freeze/ConnectionI.h>
#include <Freeze/Exception.h>
#include <Freeze/Initialize.h>
#include <Ice/LoggerUtil.h>
using namespace std;
using namespace Ice;
DbTxn*
Freeze::getTxn(const Freeze::TransactionPtr& tx)
{
return dynamic_cast<Freeze::TransactionI*>(tx.get())->dbTxn();
}
void
Freeze::TransactionI::commit()
{
if(_txn == 0)
{
throw DatabaseException(__FILE__, __LINE__, "inactive transaction");
}
long txnId = 0;
try
{
_connection->closeAllIterators();
if(_txTrace >= 1)
{
txnId = (_txn->id() & 0x7FFFFFFF) + 0x80000000L;
}
_txn->commit(0);
if(_txTrace >= 1)
{
Trace out(_communicator->getLogger(), "Freeze.Transaction");
out << "committed transaction " << hex << txnId << dec;
}
}
catch(const ::DbDeadlockException& dx)
{
if(_txTrace >= 1)
{
Trace out(_communicator->getLogger(), "Freeze.Transaction");
out << "failed to commit transaction " << hex << txnId << dec << ": " << dx.what();
}
postCompletion(false, true);
// After postCompletion is called the transaction may be
// dead. Beware!
DeadlockException ex(__FILE__, __LINE__);
ex.message = dx.what();
throw ex;
}
catch(const ::DbException& dx)
{
if(_txTrace >= 1)
{
Trace out(_communicator->getLogger(), "Freeze.Transaction");
out << "failed to commit transaction " << hex << txnId << dec << ": " << dx.what();
}
postCompletion(false, false);
// After postCompletion is called the transaction may be
// dead. Beware!
DatabaseException ex(__FILE__, __LINE__);
ex.message = dx.what();
throw ex;
}
postCompletion(true, false);
// After postCompletion is called the transaction may be
// dead. Beware!
}
void
Freeze::TransactionI::rollback()
{
rollbackInternal(false);
}
Freeze::ConnectionPtr
Freeze::TransactionI::getConnection() const
{
if(_txn)
{
return _connection;
}
return 0;
}
void
Freeze::TransactionI::rollbackInternal(bool warning)
{
if(_txn != 0)
{
long txnId = 0;
try
{
_connection->closeAllIterators();
if(_txTrace >= 1 || (warning && _warnRollback))
{
txnId = (_txn->id() & 0x7FFFFFFF) + 0x80000000L;
if(warning && _warnRollback)
{
Warning warn(_communicator->getLogger());
warn << "Freeze.Transaction: rolled back transaction " << hex << txnId << dec
<< " due to destruction.\nApplication code should explicitly call rollback or commit.";
}
}
_txn->abort();
if(_txTrace >= 1)
{
Trace out(_communicator->getLogger(), "Freeze.Transaction");
out << "rolled back transaction " << hex << txnId << dec;
}
}
catch(const ::DbDeadlockException& dx)
{
if(_txTrace >= 1)
{
Trace out(_communicator->getLogger(), "Freeze.Transaction");
out << "failed to rollback transaction " << hex << txnId << dec << ": " << dx.what();
}
DeadlockException deadlockException(__FILE__, __LINE__, dx.what(), this);
postCompletion(false, true);
// After postCompletion is called the transaction may be
// dead. Beware!
throw deadlockException;
}
catch(const ::DbException& dx)
{
if(_txTrace >= 1)
{
Trace out(_communicator->getLogger(), "Freeze.Transaction");
out << "failed to rollback transaction " << hex << txnId << dec << ": " << dx.what();
}
postCompletion(false, false);
// After postCompletion is called the transaction may be
// dead. Beware!
throw DatabaseException(__FILE__, __LINE__, dx.what());
}
postCompletion(true, false);
// After postCompletion is called the transaction may be
// dead. Beware!
}
}
void
Freeze::TransactionI::__incRef()
{
IceUtil::Mutex::Lock sync(_refCountMutex->mutex);
_refCount++;
}
void
Freeze::TransactionI::__decRef()
{
IceUtil::Mutex::Lock sync(_refCountMutex->mutex);
if(--_refCount == 0)
{
sync.release();
delete this;
}
else if(_txn != 0 && _refCount == 1 && _connection->__getRefNoSync() == 1)
{
sync.release();
rollbackInternal(true);
}
}
int
Freeze::TransactionI::__getRef() const
{
IceUtil::Mutex::Lock sync(_refCountMutex->mutex);
return _refCount;
}
int
Freeze::TransactionI::__getRefNoSync() const
{
return _refCount;
}
void
Freeze::TransactionI::setPostCompletionCallback(const Freeze::PostCompletionCallbackPtr& cb)
{
_postCompletionCallback = cb;
}
//
// The constructor takes a ConnectionI* instead of a ConnectionIPtr
// because we have to ensure there is no call to __decRef while the
// transaction or the connection are not assigned to a Ptr in
// user-code.
//
Freeze::TransactionI::TransactionI(ConnectionI* connection) :
_communicator(connection->communicator()),
_connection(connection),
_txTrace(connection->txTrace()),
_warnRollback(_communicator->getProperties()->getPropertyAsIntWithDefault("Freeze.Warn.Rollback", 1)),
_txn(0),
_refCountMutex(connection->_refCountMutex),
_refCount(0)
{
try
{
_connection->dbEnv()->getEnv()->txn_begin(0, &_txn, 0);
if(_txTrace >= 1)
{
long txnId = (_txn->id() & 0x7FFFFFFF) + 0x80000000L;
Trace out(_communicator->getLogger(), "Freeze.Transaction");
out << "started transaction " << hex << txnId << dec;
}
}
catch(const ::DbException& dx)
{
if(_txTrace >= 1)
{
Trace out(_communicator->getLogger(), "Freeze.Transaction");
out << "failed to start transaction: " << dx.what();
}
DatabaseException ex(__FILE__, __LINE__);
ex.message = dx.what();
throw ex;
}
}
Freeze::TransactionI::~TransactionI()
{
assert(_txn == 0);
}
void
Freeze::TransactionI::postCompletion(bool committed, bool deadlock)
{
// The order of assignment in this method is very important as
// calling both the post completion callback and
// Connection::clearTransaction may alter the transaction
// reference count which checks _txn.
{
//
// We synchronize here as _txn is checked (read) in the refcounting code
//
IceUtil::Mutex::Lock sync(_refCountMutex->mutex);
_txn = 0;
}
if(_postCompletionCallback != 0)
{
PostCompletionCallbackPtr cb = _postCompletionCallback;
_postCompletionCallback = 0;
cb->postCompletion(committed, deadlock);
}
ConnectionIPtr connection = _connection;
_connection = 0;
connection->clearTransaction(); // may release the last _refCount
}
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