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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* 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 Server Side 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 <memory>
#include <mutex>
#include <set>
#include "mongo/db/storage/ephemeral_for_test/ephemeral_for_test_radix_store.h"
#include "mongo/db/storage/ephemeral_for_test/ephemeral_for_test_record_store.h"
#include "mongo/db/storage/ephemeral_for_test/ephemeral_for_test_sorted_impl.h"
#include "mongo/db/storage/kv/kv_engine.h"
namespace mongo {
namespace ephemeral_for_test {
static constexpr char kEngineName[] = "ephemeralForTest";
class JournalListener;
/**
* The ephemeral for test storage engine is intended for unit and performance testing.
*/
class KVEngine : public mongo::KVEngine {
public:
KVEngine();
virtual ~KVEngine();
virtual mongo::RecoveryUnit* newRecoveryUnit();
virtual Status createRecordStore(OperationContext* opCtx,
StringData ns,
StringData ident,
const CollectionOptions& options);
virtual std::unique_ptr<mongo::RecordStore> getRecordStore(OperationContext* opCtx,
StringData ns,
StringData ident,
const CollectionOptions& options);
virtual std::unique_ptr<mongo::RecordStore> makeTemporaryRecordStore(OperationContext* opCtx,
StringData ident) override;
virtual Status createSortedDataInterface(OperationContext* opCtx,
const CollectionOptions& collOptions,
StringData ident,
const IndexDescriptor* desc);
virtual Status dropGroupedSortedDataInterface(OperationContext* opCtx, StringData ident) {
return Status::OK();
}
virtual std::unique_ptr<mongo::SortedDataInterface> getSortedDataInterface(
OperationContext* opCtx, StringData ident, const IndexDescriptor* desc);
virtual Status beginBackup(OperationContext* opCtx) {
return Status::OK();
}
virtual void endBackup(OperationContext* opCtx) {}
virtual Status dropIdent(OperationContext* opCtx, mongo::RecoveryUnit* ru, StringData ident);
virtual bool supportsDirectoryPerDB() const {
return false; // Not persistant so no Directories
}
virtual bool supportsCappedCollections() const {
return true;
}
/**
* Ephemeral for test does not write to disk.
*/
virtual bool isDurable() const {
return false;
}
virtual bool isEphemeral() const {
return true;
}
virtual int64_t getIdentSize(OperationContext* opCtx, StringData ident) {
return 0;
}
virtual Status repairIdent(OperationContext* opCtx, StringData ident) {
return Status::OK();
}
virtual bool hasIdent(OperationContext* opCtx, StringData ident) const {
return true;
}
std::vector<std::string> getAllIdents(OperationContext* opCtx) const {
std::vector<std::string> idents;
for (const auto& i : _idents) {
idents.push_back(i.first);
}
return idents;
}
virtual void cleanShutdown(){};
void setJournalListener(mongo::JournalListener* jl) final {}
virtual Timestamp getAllDurableTimestamp() const override {
RecordId id = _visibilityManager->getAllCommittedRecord();
return Timestamp(id.repr());
}
virtual Timestamp getOldestOpenReadTimestamp() const override {
return Timestamp();
}
boost::optional<Timestamp> getOplogNeededForCrashRecovery() const final {
return boost::none;
}
// Ephemeral for test Specific
/**
* Returns a pair of the current version and a shared_ptr of tree of the master at the provided
* timestamp. Null timestamps will return the latest master and timestamps before oldest
* timestamp will throw SnapshotTooOld exception.
*/
std::pair<uint64_t, std::shared_ptr<StringStore>> getMasterInfo(
boost::optional<Timestamp> timestamp = boost::none);
/**
* Returns true and swaps _master to newMaster if the version passed in is the same as the
* masters current version.
*/
bool trySwapMaster(StringStore& newMaster, uint64_t version);
VisibilityManager* visibilityManager() {
return _visibilityManager.get();
}
/**
* History in the map that is older than the oldest timestamp can be removed. Additionally, if
* the tree at the oldest timestamp is no longer in use by any active transactions it can be
* cleaned up, up until the point where there's an active transaction in the map. That point
* also becomes the new oldest timestamp.
*/
void cleanHistory();
Timestamp getOldestTimestamp() const override;
void setOldestTimestamp(Timestamp newOldestTimestamp, bool force) override;
std::map<Timestamp, std::shared_ptr<StringStore>> getHistory_forTest();
static bool instanceExists();
private:
void _cleanHistory(WithLock);
Timestamp _getOldestTimestamp(WithLock) const {
return _availableHistory.begin()->first;
}
std::shared_ptr<void> _catalogInfo;
int _cachePressureForTest = 0;
mutable Mutex _identsLock = MONGO_MAKE_LATCH("KVEngine::_identsLock");
std::map<std::string, bool> _idents; // TODO : replace with a query to _master.
std::unique_ptr<VisibilityManager> _visibilityManager;
mutable Mutex _masterLock = MONGO_MAKE_LATCH("KVEngine::_masterLock");
std::shared_ptr<StringStore> _master;
// While write transactions aren't implemented, we use the _masterVersion to generate mock
// commit timestamps. We need to start at 1 to avoid the null timestamp.
uint64_t _masterVersion = 1;
// This map contains the different versions of the StringStore's referenced by their commit
// timestamps.
std::map<Timestamp, std::shared_ptr<StringStore>> _availableHistory;
};
} // namespace ephemeral_for_test
} // namespace mongo
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