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#ifndef QPID_STORE_MSCLFS_MESSAGES_H
#define QPID_STORE_MSCLFS_MESSAGES_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 <windows.h>
#include <map>
#include <set>
#include <vector>
#include <boost/intrusive_ptr.hpp>
#include <qpid/broker/PersistableMessage.h>
#include <qpid/sys/Mutex.h>
#include "MessageLog.h"
#include "Transaction.h"
namespace qpid {
namespace store {
namespace ms_clfs {
class Messages {
struct MessageInfo {
// How many queues this message is on, whether actually (non-transacted)
// or provisionally (included in a non-yet-committed transaction).
volatile LONG enqueuedCount;
// Keep a list of transactional operations this message is
// referenced in. When the transaction changes/finalizes these all
// need to be acted on.
typedef enum { TRANSACTION_NONE = 0,
TRANSACTION_ENQUEUE,
TRANSACTION_DEQUEUE } TransType;
#if 0
std::map<Transaction::shared_ptr, std::vector<TransType> > transOps;
qpid::sys::Mutex transOpsLock;
#endif
// Think what I need is a list of "where is this message" - queue id,
// transaction ref, what kind of trans op (enq/deq). Then "remove all
// queue refs" can search through all messages looking for queue ids
// and undo them. Write "remove from queue" record to log. Also need to
// add "remove from queue" to recovery.
struct Location {
uint64_t queueId;
Transaction::shared_ptr transaction;
TransType disposition;
Location(uint64_t q)
: queueId(q), transaction(), disposition(TRANSACTION_NONE) {}
Location(uint64_t q, Transaction::shared_ptr& t, TransType d)
: queueId(q), transaction(t), disposition(d) {}
};
qpid::sys::Mutex whereLock;
std::list<Location> where;
// The transactions vector just keeps a shared_ptr to each
// Transaction this message was involved in, regardless of the
// disposition or transaction state. Keeping a valid shared_ptr
// prevents the Transaction from being deleted. As long as there
// are any messages that referred to a transaction, that
// transaction's state needs to be known so the message disposition
// can be correctly recovered if needed.
std::vector<Transaction::shared_ptr> transactions;
typedef boost::shared_ptr<MessageInfo> shared_ptr;
MessageInfo() : enqueuedCount(0) {}
};
qpid::sys::RWlock lock;
typedef std::map<uint64_t, MessageInfo::shared_ptr> MessageMap;
MessageMap messages;
MessageLog log;
// Remove a specified message from those controlled by this object.
void remove(uint64_t messageId);
public:
void openLog(const std::string& path, const Log::TuningParameters& params);
// Add the specified message to the log and list of known messages.
// Upon successful return the message's persistenceId is set.
void add(const boost::intrusive_ptr<qpid::broker::PersistableMessage>& msg);
// Add the specified queue to the message's list of places it is
// enqueued.
void enqueue(uint64_t msgId, uint64_t queueId, Transaction::shared_ptr& t);
// Remove the specified queue from the message's list of places it is
// enqueued. If there are no other queues holding the message, it is
// deleted.
void dequeue(uint64_t msgId, uint64_t queueId, Transaction::shared_ptr& t);
// Commit a previous provisional enqueue or dequeue of a particular message
// actions under a specified transaction. If this results in the message's
// being removed from all queues, it is deleted.
void commit(uint64_t msgId, Transaction::shared_ptr& transaction);
// Abort a previous provisional enqueue or dequeue of a particular message
// actions under a specified transaction. If this results in the message's
// being removed from all queues, it is deleted.
void abort(uint64_t msgId, Transaction::shared_ptr& transaction);
// Load part or all of a message's content from previously stored
// log record(s).
void loadContent(uint64_t msgId,
std::string& data,
uint64_t offset,
uint32_t length);
// Expunge is called when a queue is deleted. All references to that
// queue must be expunged from all messages.
void expunge(uint64_t queueId);
// Recover the current set of messages and where they're queued from
// the log.
void recover(qpid::broker::RecoveryManager& recoverer,
const std::set<uint64_t> &validQueues,
const std::map<uint64_t, Transaction::shared_ptr>& transMap,
qpid::store::MessageMap& messageMap,
qpid::store::MessageQueueMap& messageQueueMap);
};
}}} // namespace qpid::store::ms_clfs
#endif /* QPID_STORE_MSCLFS_MESSAGES_H */
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