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#ifndef QPID_STORE_MSCLFS_TRANSACTION_H
#define QPID_STORE_MSCLFS_TRANSACTION_H
/*
*
* 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/TransactionalStore.h>
#include <qpid/sys/Mutex.h>
#include <boost/enable_shared_from_this.hpp>
#include <boost/shared_ptr.hpp>
#include <string>
#include "TransactionLog.h"
namespace qpid {
namespace store {
namespace ms_clfs {
class Messages;
/**
* @class Transaction
*
* Class representing an AMQP transaction. This is used around a set of
* enqueue and dequeue operations that occur when the broker is acting
* on a transaction commit/abort from the client.
* This class is what the store uses internally to implement things a
* transaction needs; the broker knows about TransactionContext, which
* holds a pointer to Transaction.
*
* NOTE: All references to Transactions (and TPCTransactions, below) are
* through Boost shared_ptr instances. All messages enrolled in a transaction
* hold a shared_ptr. Thus, a Transaction object will not be deleted until all
* messages holding a reference to it are deleted. This fact is also used
* during recovery to automatically clean up and delete any Transaction without
* messages left referring to it.
*/
class Transaction : public boost::enable_shared_from_this<Transaction> {
private:
// TransactionLog has to create all Transaction instances.
Transaction() {}
public:
typedef boost::shared_ptr<Transaction> shared_ptr;
typedef enum { TRANS_OPEN = 1,
TRANS_PREPARED,
TRANS_ABORTED,
TRANS_COMMITTED,
TRANS_DELETED } State;
virtual ~Transaction();
uint64_t getId() { return id; }
State getState() { return state; }
void enroll(uint64_t msgId);
void unenroll(uint64_t msgId); // For failed ops, not normal end-of-trans
void abort(Messages& messages);
void commit(Messages& messages);
protected:
friend class TransactionLog;
Transaction(uint64_t _id, const TransactionLog::shared_ptr& _log)
: id(_id), state(TRANS_OPEN), log(_log) {}
uint64_t id;
State state;
TransactionLog::shared_ptr log;
std::vector<uint64_t> enrolledMessages;
qpid::sys::RWlock enrollLock;
};
class TransactionContext : public qpid::broker::TransactionContext {
Transaction::shared_ptr transaction;
public:
TransactionContext(const Transaction::shared_ptr& _transaction)
: transaction(_transaction) {}
virtual Transaction::shared_ptr& getTransaction() { return transaction; }
};
/**
* @class TPCTransaction
*
* Class representing a Two-Phase-Commit (TPC) AMQP transaction. This is
* used around a set of enqueue and dequeue operations that occur when the
* broker is acting on a transaction prepare/commit/abort from the client.
* This class is what the store uses internally to implement things a
* transaction needs; the broker knows about TPCTransactionContext, which
* holds a pointer to TPCTransaction.
*/
class TPCTransaction : public Transaction {
friend class TransactionLog;
TPCTransaction(uint64_t _id,
const TransactionLog::shared_ptr& _log,
const std::string& _xid)
: Transaction(_id, _log), xid(_xid) {}
std::string xid;
public:
typedef boost::shared_ptr<TPCTransaction> shared_ptr;
virtual ~TPCTransaction() {}
void prepare();
bool isPrepared() const { return state == TRANS_PREPARED; }
const std::string& getXid(void) const { return xid; }
};
class TPCTransactionContext : public qpid::broker::TPCTransactionContext {
TPCTransaction::shared_ptr transaction;
public:
TPCTransactionContext(const TPCTransaction::shared_ptr& _transaction)
: transaction(_transaction) {}
virtual TPCTransaction::shared_ptr& getTransaction() { return transaction; }
};
}}} // namespace qpid::store::ms_clfs
#endif /* QPID_STORE_MSCLFS_TRANSACTION_H */
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