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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 <map>
#include <string>
#include "mongo/base/status.h"
#include "mongo/base/string_data.h"
#include "mongo/db/catalog/database_catalog_entry.h"
#include "mongo/db/storage/mmap_v1/catalog/namespace_details_collection_entry.h"
#include "mongo/db/storage/mmap_v1/catalog/namespace_index.h"
#include "mongo/db/storage/mmap_v1/mmap_v1_extent_manager.h"
namespace mongo {
class CollectionCatalogEntry;
struct CollectionOptions;
class IndexAccessMethod;
class IndexCatalogEntry;
class IndexDescriptor;
class RecordId;
class RecordStore;
class RecordStoreV1Base;
class RecoveryUnit;
class OperationContext;
class MMAPV1DatabaseCatalogEntry : public DatabaseCatalogEntry {
public:
MMAPV1DatabaseCatalogEntry(OperationContext* txn,
StringData name,
StringData path,
bool directoryperdb,
bool transient,
std::unique_ptr<ExtentManager> extentManager);
virtual ~MMAPV1DatabaseCatalogEntry();
// these two seem the same and yet different
// TODO(ERH): consolidate into one ideally
virtual bool exists() const {
return _namespaceIndex.pathExists();
}
virtual bool isEmpty() const {
return !_namespaceIndex.allocated();
}
virtual bool hasUserData() const {
// The two collections which exist and can't be removed are:
// system.indexes
// system.namespaces
return _collections.size() > 2;
}
virtual int64_t sizeOnDisk(OperationContext* opCtx) const;
virtual bool isOlderThan24(OperationContext* opCtx) const;
virtual void markIndexSafe24AndUp(OperationContext* opCtx);
// Records in the data file version bits that an index or collection may have an associated
// collation.
void markCollationFeatureAsInUse(OperationContext* opCtx);
virtual Status currentFilesCompatible(OperationContext* opCtx) const;
virtual void appendExtraStats(OperationContext* opCtx, BSONObjBuilder* out, double scale) const;
Status createCollection(OperationContext* txn,
StringData ns,
const CollectionOptions& options,
bool allocateDefaultSpace);
Status dropCollection(OperationContext* txn, StringData ns);
Status renameCollection(OperationContext* txn,
StringData fromNS,
StringData toNS,
bool stayTemp);
void getCollectionNamespaces(std::list<std::string>* tofill) const;
/**
* will return NULL if ns does not exist
*/
NamespaceDetailsCollectionCatalogEntry* getCollectionCatalogEntry(StringData ns) const;
RecordStore* getRecordStore(StringData ns) const;
IndexAccessMethod* getIndex(OperationContext* txn,
const CollectionCatalogEntry* collection,
IndexCatalogEntry* index);
const ExtentManager* getExtentManager() const {
return _extentManager.get();
}
ExtentManager* getExtentManager() {
return _extentManager.get();
}
CollectionOptions getCollectionOptions(OperationContext* txn, StringData ns) const;
CollectionOptions getCollectionOptions(OperationContext* txn, RecordId nsRid) const;
/**
* Creates a CollectionCatalogEntry in the form of an index rather than a collection.
* MMAPv1 puts both indexes and collections into CCEs. A namespace named 'name' must not
* exist.
*/
void createNamespaceForIndex(OperationContext* txn, StringData name);
static void invalidateSystemCollectionRecord(OperationContext* txn,
NamespaceString systemCollectionNamespace,
RecordId record);
private:
class EntryInsertion;
class EntryRemoval;
friend class NamespaceDetailsCollectionCatalogEntry;
// The _collections map is a cache for efficiently looking up namespace information. Access
// to the cache is protected by holding the appropriate DB lock. Regular operations
// (insert/update/delete/query) hold intent locks on the database and they access the cache
// directly. Metadata operations, such as create db/collection, etc acquire exclusive lock
// on the database, which protects against concurrent readers of the cache.
//
// Once initialized, the cache must remain consistent with the data in the memory-mapped
// database files through _removeFromCache and _insertInCache. These methods use the
// RecoveryUnit to ensure correct handling of rollback.
struct Entry {
std::unique_ptr<NamespaceDetailsCollectionCatalogEntry> catalogEntry;
std::unique_ptr<RecordStoreV1Base> recordStore;
};
typedef std::map<std::string, Entry*> CollectionMap;
RecordStoreV1Base* _getIndexRecordStore();
RecordStoreV1Base* _getNamespaceRecordStore() const;
RecordStoreV1Base* _getRecordStore(StringData ns) const;
RecordId _addNamespaceToNamespaceCollection(OperationContext* txn,
StringData ns,
const BSONObj* options);
void _removeNamespaceFromNamespaceCollection(OperationContext* txn, StringData ns);
Status _renameSingleNamespace(OperationContext* txn,
StringData fromNS,
StringData toNS,
bool stayTemp);
void _ensureSystemCollection(OperationContext* txn, StringData ns);
void _init(OperationContext* txn);
/**
* Populate the _collections cache.
*/
void _insertInCache(OperationContext* opCtx, StringData ns, RecordId rid, Entry* entry);
/**
* Drop cached information for specified namespace. If a RecoveryUnit is specified,
* use it to allow rollback. When ru is null, removal is unconditional.
*/
void _removeFromCache(RecoveryUnit* ru, StringData ns);
const std::string _path;
NamespaceIndex _namespaceIndex;
std::unique_ptr<ExtentManager> _extentManager;
CollectionMap _collections;
};
}
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