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/**
* Copyright (C) 2013 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/>.
*/
#pragma once
#include <string>
#include "mongo/base/disallow_copying.h"
#include "mongo/bson/bson_field.h"
namespace mongo {
/**
* A WriteBatch is a list of writes (of a single type, targeting a single collection), with
* associated options. WriteBatch objects are data structures created from raw BSON in
* the write command format, and are used as a container for WriteItem objects.
*
* Example usage:
*
* WriteBatch wb("db.collection", WriteBatch::WRITE_INSERT);
* string errMsg;
* bool ret = wb.parse(fromjson("{insert: \"collection\",
* documents: [{_id: 0},{_id: 1}}],
* writeConcern: {w: \"majority\"},
* continueOnError: false}"),
* &errMsg);
* if (!ret) {
* // errMsg ...
* }
* else {
* for (size_t i = 0; i < wb.getNumWriteItems(); i++) {
* // wb.getWriteItem(i) ...
* }
* }
*
*/
class WriteBatch {
MONGO_DISALLOW_COPYING(WriteBatch);
public:
enum WriteType {WRITE_INSERT, WRITE_UPDATE, WRITE_DELETE};
/**
* Constructs a WriteBatch for operations of type "writeType" for the fully-qualified
* namespace "ns". Expects "ns" to be well-formed.
*
* Need to complete initialization by calling parse() on the newly-constructed object.
*/
WriteBatch(const StringData& ns, WriteType writeType);
~WriteBatch();
/**
* Completes initialization by parsing associated command object.
*
* Returns false (and sets errMsg appropriately) on parsing error, else returns true.
* Can only be called once per object.
*/
bool parse(const BSONObj& cmdObj, string* errMsg);
/**
* Returns a single write item in the contained batch.
*
* n must be less than numWriteItems().
*/
class WriteItem;
const WriteItem& getWriteItem(size_t n) const;
//
// Accessors
//
WriteType getWriteType() const;
const string& getNS() const;
bool getContinueOnError() const;
const BSONObj& getWriteConcern() const;
size_t getNumWriteItems() const;
private:
//
// Expected fields for the write cammand format.
//
static const BSONField<std::vector<BSONObj> > insertContainerField;
static const BSONField<std::vector<BSONObj> > updateContainerField;
static const BSONField<std::vector<BSONObj> > deleteContainerField;
static const BSONField<BSONObj> writeConcernField;
static const BSONField<bool> continueOnErrorField;
// Namespace to target (fully-qualified, e.g. "test.foo").
const string _ns;
// Type of write (e.g. insert).
//
// All write items contained will also have this write type.
const WriteType _writeType;
// When a write item fails execution, whether or not to process subsequent items.
bool _continueOnError;
// Write concern to satisfy, e.g. (e.g. {w:2, wtimeout:1000, j:true})
BSONObj _writeConcern;
// List of write items. Owned here.
std::vector<const WriteItem*> _writeItems;
};
/**
* A single item in a write batch.
*
* After constructing a WriteItem(), caller must verify isValid() to ensure request is
* properly formatted.
*/
class WriteBatch::WriteItem {
public:
WriteItem(WriteType writeType, const BSONObj& writeItem);
/**
* Returns true iff "_writeItem" is a properly-formatted object of "_writeType".
* If not valid, fills in errMsg (if requested).
*/
bool isValid(string* errMsg = NULL) const;
/**
* Accessor for _writeType.
*/
WriteType getWriteType() const;
/**
* Returns true if object is valid, and fills in respective fields.
* Returns false if object is not valid, and fills in errMsg.
*/
bool parseInsertItem(string* errMsg, BSONObj* doc) const;
/**
* Returns true if object is valid, and fills in respective fields.
* Returns false if object is not valid, and fills in errMsg.
*/
bool parseUpdateItem(string* errMsg,
BSONObj* queryObj,
BSONObj* updateObj,
bool* multi,
bool* upsert) const;
/**
* Returns true if object is valid, and fills in respective fields.
* Returns false if object is not valid, and fills in errMsg.
*/
// TODO Add "limit" option to delete.
bool parseDeleteItem(string* errMsg, BSONObj* queryObj) const;
private:
//
// Expected fields for the write item format.
//
static const BSONField<BSONObj> updateQField;
static const BSONField<BSONObj> updateUField;
static const BSONField<bool> updateMultiField;
static const BSONField<bool> updateUpsertField;
static const BSONField<BSONObj> deleteQField;
// Type of write (e.g. insert).
WriteType _writeType;
// Unparsed contents of write (e.g. for update, {q:{}, u:{$set:{a:1}}}).
BSONObj _writeItem;
};
} // namespace mongo
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