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/**
* Copyright (C) 2014 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#pragma once
#include <atomic>
#include <map>
#include <stack>
#include <string>
#include <vector>
#include <unordered_map>
#include <boost/scoped_ptr.hpp>
#include <boost/shared_ptr.hpp>
#include "mongo/base/disallow_copying.h"
#include "mongo/base/owned_pointer_vector.h"
#include "mongo/db/record_id.h"
#include "mongo/db/storage/recovery_unit.h"
#include "mongo/db/storage/rocks/rocks_transaction.h"
namespace rocksdb {
class DB;
class Snapshot;
class WriteBatchWithIndex;
class Comparator;
class Status;
class ColumnFamilyHandle;
class Slice;
class Iterator;
}
namespace mongo {
class OperationContext;
class RocksRecoveryUnit : public RecoveryUnit {
MONGO_DISALLOW_COPYING(RocksRecoveryUnit);
public:
RocksRecoveryUnit(RocksTransactionEngine* transactionEngine, rocksdb::DB* db, bool durable);
virtual ~RocksRecoveryUnit();
virtual void beginUnitOfWork();
virtual void commitUnitOfWork();
virtual void endUnitOfWork();
virtual bool awaitCommit();
virtual void commitAndRestart();
virtual void* writingPtr(void* data, size_t len) { invariant(!"don't call writingPtr"); }
virtual void registerChange(Change* change);
// local api
rocksdb::WriteBatchWithIndex* writeBatch();
const rocksdb::Snapshot* snapshot();
bool hasSnapshot() { return _snapshot != nullptr; }
RocksTransaction* transaction() { return &_transaction; }
rocksdb::Status Get(rocksdb::ColumnFamilyHandle* columnFamily, const rocksdb::Slice& key,
std::string* value);
rocksdb::Iterator* NewIterator(rocksdb::ColumnFamilyHandle* columnFamily);
void incrementCounter(const rocksdb::Slice& counterKey,
std::atomic<long long>* counter, long long delta);
long long getDeltaCounter(const rocksdb::Slice& counterKey);
void setOplogReadTill(const RecordId& loc);
RecordId getOplogReadTill() const { return _oplogReadTill; }
RocksRecoveryUnit* newRocksRecoveryUnit() {
return new RocksRecoveryUnit(_transactionEngine, _db, _durable);
}
struct Counter {
std::atomic<long long>* _value;
long long _delta;
Counter() : Counter(nullptr, 0) {}
Counter(std::atomic<long long>* value, long long delta) : _value(value), _delta(delta) {}
};
typedef std::unordered_map<std::string, Counter> CounterMap;
static RocksRecoveryUnit* getRocksRecoveryUnit(OperationContext* opCtx);
private:
void _releaseSnapshot();
void _commit();
void _abort();
RocksTransactionEngine* _transactionEngine; // not owned
rocksdb::DB* _db; // not owned
const bool _durable;
RocksTransaction _transaction;
boost::scoped_ptr<rocksdb::WriteBatchWithIndex> _writeBatch; // owned
// bare because we need to call ReleaseSnapshot when we're done with this
const rocksdb::Snapshot* _snapshot; // owned
CounterMap _deltaCounters;
typedef OwnedPointerVector<Change> Changes;
Changes _changes;
int _depth;
RecordId _oplogReadTill;
};
}
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