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collection_options.h
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collection_options.h
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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 <string>
#include <boost/optional.hpp>
#include "mongo/base/status.h"
#include "mongo/db/jsobj.h"
#include "mongo/util/uuid.h"
/* 参考https://docs.mongodb.com/manual/reference/command/create/#:~:text=%20%20%20%20Field%20%20%20,in%20byte%20...%20%2011%20more%20rows%20
{
create: <collection or view name>,
capped: <true|false>,
autoIndexId: <true|false>,
size: <max_size>,
max: <max_documents>,
storageEngine: <document>,
validator: <document>,
validationLevel: <string>,
validationAction: <string>,
indexOptionDefaults: <document>,
viewOn: <source>,
pipeline: <pipeline>,
collation: <document>,
writeConcern: <document>,
comment: <any>
}
建表create参考https://docs.mongodb.com/manual/reference/command/create/#:~:text=%20%20%20%20Field%20%20%20,in%20byte%20...%20%2011%20more%20rows%20
*/
namespace mongo {
extern bool enableCollectionUUIDs; // TODO(SERVER-27993) Replace based on upgrade/downgrade state.
/**
* A CollectionUUID is a 128-bit unique identifier, per RFC 4122, v4. for a database collection.
* Newly created collections are assigned a new randomly generated CollectionUUID. In a replica-set
* or a sharded cluster, all nodes will use the same UUID for a given collection. The UUID stays
* with the collection until it is dropped, so even across renames. A copied collection must have
* its own new unique UUID though.
*/
using CollectionUUID = UUID; //UUID代表唯一标识码
//CollectionOptions.uuid成员
using OptionalCollectionUUID = boost::optional<CollectionUUID>;
//使用参考DatabaseImpl::createCollection
struct CollectionOptions {
/**
* Returns true if the options indicate the namespace is a view.
*/
bool isView() const;
/**
* The 'uuid' member is a collection property stored in the catalog with user-settable options,
* but is not valid for the user to specify as collection option. So, parsing commands must
* reject the 'uuid' property, but parsing stored options must accept it.
*/
enum ParseKind { parseForCommand, parseForStorage };
/**
* Confirms that collection options can be converted to BSON and back without errors.
*/
Status validateForStorage() const;
/**
* Parses the "options" subfield of the collection info object.
*/
Status parse(const BSONObj& obj, ParseKind kind = parseForCommand);
BSONObj toBSON() const;
/**
* @param max in and out, will be adjusted
* @return if the value is valid at all
*/
static bool validMaxCappedDocs(long long* max);
// ----
//uuid生成见UUID::gen()
// Collection UUID. Will exist if featureCompatibilityVersion >= 3.6.
OptionalCollectionUUID uuid; //每个collection会对应一个uuid,见DatabaseImpl::createCollection,只有3.6以上版本有该uuid
//说明是MongoDB固定集合(capped collection)
//可以通过下面的方式创建固定集合
//db.createCollection("xx",{capped:true, size: 1000000})
bool capped = false;
long long cappedSize = 0;
long long cappedMaxDocs = 0;
// (MMAPv1) The following 2 are mutually exclusive, can only have one set.
long long initialNumExtents = 0;
std::vector<long long> initialExtentSizes;
// The behavior of _id index creation when collection created
void setNoIdIndex() {
autoIndexId = NO;
}
enum {
DEFAULT, // currently yes for most collections, NO for some system ones
YES, // create _id index
NO // do not create _id index
} autoIndexId = DEFAULT;
// user flags
//https://www.zhihu.com/question/52124985?sort=created 可以参考这里
enum UserFlags {
Flag_UsePowerOf2Sizes = 1 << 0,
Flag_NoPadding = 1 << 1,
};
int flags = Flag_UsePowerOf2Sizes; // a bitvector of UserFlags
bool flagsSet = false;
//说明是否为临时表
bool temp = false;
// Storage engine collection options. Always owned or empty.
BSONObj storageEngine;
// Default options for indexes created on the collection. Always owned or empty.
BSONObj indexOptionDefaults;
// Always owned or empty.
BSONObj validator;
std::string validationAction;
std::string validationLevel;
// The namespace's default collation.
BSONObj collation;
// View-related options.
// The namespace of the view or collection that "backs" this view, or the empty string if this
// collection is not a view.
std::string viewOn;
// The aggregation pipeline that defines this view.
BSONObj pipeline;
};
}