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// database.h
/**
* Copyright (C) 2008 10gen 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 "mongo/db/cc_by_loc.h"
#include "mongo/db/cmdline.h"
#include "mongo/db/namespace_details.h"
#include "mongo/db/storage/record.h"
#include "mongo/db/storage/extent_manager.h"
#include "mongo/db/structure/collection.h"
namespace mongo {
class Extent;
class DataFile;
/**
* Database represents a database database
* Each database database has its own set of files -- dbname.ns, dbname.0, dbname.1, ...
* NOT memory mapped
*/
class Database {
public:
// you probably need to be in dbHolderMutex when constructing this
Database(const char *nm, /*out*/ bool& newDb, const string& path = dbpath);
/* you must use this to close - there is essential code in this method that is not in the ~Database destructor.
thus the destructor is private. this could be cleaned up one day...
*/
static void closeDatabase( const string& db, const string& path );
const string& name() const { return _name; }
const string& path() const { return _path; }
void clearTmpCollections();
/**
* tries to make sure that this hasn't been deleted
*/
bool isOk() const { return _magic == 781231; }
bool isEmpty() { return ! _namespaceIndex.allocated(); }
/**
* total file size of Database in bytes
*/
long long fileSize() const { return _extentManager.fileSize(); }
int numFiles() const { return _extentManager.numFiles(); }
/**
* return file n. if it doesn't exist, create it
*/
DataFile* getFile( int n, int sizeNeeded = 0, bool preallocateOnly = false ) {
_namespaceIndex.init();
return _extentManager.getFile( n, sizeNeeded, preallocateOnly );
}
DataFile* addAFile( int sizeNeeded, bool preallocateNextFile ) {
return _extentManager.addAFile( sizeNeeded, preallocateNextFile );
}
/**
* makes sure we have an extra file at the end that is empty
* safe to call this multiple times - the implementation will only preallocate one file
*/
void preallocateAFile() { _extentManager.preallocateAFile(); }
Extent* allocExtent( const char *ns, int size, bool capped, bool enforceQuota );
/**
* @return true if success. false if bad level or error creating profile ns
*/
bool setProfilingLevel( int newLevel , string& errmsg );
void flushFiles( bool sync ) { return _extentManager.flushFiles( sync ); }
/**
* @return true if ns is part of the database
* ns=foo.bar, db=foo returns true
*/
bool ownsNS( const string& ns ) const {
if ( ! startsWith( ns , _name ) )
return false;
return ns[_name.size()] == '.';
}
const RecordStats& recordStats() const { return _recordStats; }
RecordStats& recordStats() { return _recordStats; }
int getProfilingLevel() const { return _profile; }
const char* getProfilingNS() const { return _profileName.c_str(); }
CCByLoc& ccByLoc() { return _ccByLoc; }
const NamespaceIndex& namespaceIndex() const { return _namespaceIndex; }
NamespaceIndex& namespaceIndex() { return _namespaceIndex; }
// TODO: do not think this method should exist, so should try and encapsulate better
ExtentManager& getExtentManager() { return _extentManager; }
const ExtentManager& getExtentManager() const { return _extentManager; }
void dropCollection( const StringData& fullns );
/**
* @param ns - this is fully qualified, which is maybe not ideal ???
*/
CollectionTemp* getCollectionTemp( const StringData& ns );
Status renameCollection( const StringData& fromNS, const StringData& toNS, bool stayTemp );
/**
* @return name of an existing database with same text name but different
* casing, if one exists. Otherwise the empty string is returned. If
* 'duplicates' is specified, it is filled with all duplicate names.
*/
static string duplicateUncasedName( bool inholderlockalready, const string &name, const string &path, set< string > *duplicates = 0 );
static Status validateDBName( const StringData& dbname );
private:
~Database(); // closes files and other cleanup see below.
/**
* @throws DatabaseDifferCaseCode if the name is a duplicate based on
* case insensitive matching.
*/
void checkDuplicateUncasedNames(bool inholderlockalready) const;
void openAllFiles();
Status _renameSingleNamespace( const StringData& fromNS, const StringData& toNS,
bool stayTemp );
const string _name; // "alleyinsider"
const string _path; // "/data/db"
NamespaceIndex _namespaceIndex;
ExtentManager _extentManager;
const string _profileName; // "alleyinsider.system.profile"
const string _namespacesName; // "alleyinsider.system.namespaces"
CCByLoc _ccByLoc; // use by ClientCursor
RecordStats _recordStats;
int _profile; // 0=off.
int _magic; // used for making sure the object is still loaded in memory
// TODO: probably shouldn't be a std::map
// TODO: make sure deletes go through
// this in some ways is a dupe of _namespaceIndex
// but it points to a much more useful data structure
typedef std::map< std::string, CollectionTemp* > CollectionMap;
CollectionMap _collections;
mutex _collectionLock;
};
} // namespace mongo
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