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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/>.
*
* 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 <vector>
#include "mongo/bson/simple_bsonobj_comparator.h"
#include "mongo/db/jsobj.h"
#include "mongo/s/chunk_version.h"
namespace mongo {
/**
* A KeyRange represents a range over keys of documents in a namespace, qualified by a
* key pattern which defines the documents that are in the key range.
*
* There may be many different expressions to generate the same key fields from a document - the
* keyPattern tells us these expressions.
*
* Ex:
* DocA : { field : "aaaa" }
* DocB : { field : "bbb" }
* DocC : { field : "ccccc" }
*
* keyPattern : { field : 1 }
* minKey : { field : "aaaa" } : Id(DocA)
* maxKey : { field : "ccccc" } : Id(DocB)
*
* contains Id(DocB)
*
* keyPattern : { field : "numberofletters" }
* minKey : { field : 4 } : numberofletters(DocA)
* maxKey : { field : 5 } : numberofletters(DocC)
*
* does not contain numberofletters(DocB)
*/
struct KeyRange {
KeyRange(const std::string& ns,
const BSONObj& minKey,
const BSONObj& maxKey,
const BSONObj& keyPattern)
: ns(ns), minKey(minKey), maxKey(maxKey), keyPattern(keyPattern) {}
KeyRange() {}
std::string ns;
BSONObj minKey;
BSONObj maxKey;
BSONObj keyPattern;
};
/**
* Returns true if the point is within the range [inclusiveLower, exclusiveUpper).
*/
bool rangeContains(const BSONObj& inclusiveLower,
const BSONObj& exclusiveUpper,
const BSONObj& point);
/**
* Returns true if the bounds specified by [inclusiveLower1, exclusiveUpper1)
* intersects with the bounds [inclusiveLower2, exclusiveUpper2).
*/
bool rangeOverlaps(const BSONObj& inclusiveLower1,
const BSONObj& exclusiveUpper1,
const BSONObj& inclusiveLower2,
const BSONObj& exclusiveUpper2);
/**
* Returns -1 if first range is less than the second range, 0 if equal and 1 if
* greater. The ordering is based on comparing both the min first and then uses
* the max as the tie breaker.
*/
int compareRanges(const BSONObj& rangeMin1,
const BSONObj& rangeMax1,
const BSONObj& rangeMin2,
const BSONObj& rangeMax2);
/**
* Represents a cached chunk information on the shard.
*/
class CachedChunkInfo {
public:
CachedChunkInfo(BSONObj maxKey, ChunkVersion version);
const BSONObj& getMaxKey() const {
return _maxKey;
}
const ChunkVersion& getVersion() const {
return _version;
}
private:
BSONObj _maxKey;
ChunkVersion _version;
};
/**
* A RangeMap is a mapping of an inclusive lower BSON key to an upper key and chunk version, using
* standard BSON woCompare. The upper bound is exclusive.
*
* NOTE: For overlap testing to work correctly, there may be no overlaps present in the map itself.
*/
typedef BSONObjIndexedMap<CachedChunkInfo> RangeMap;
/**
* A RangeVector is a list of [lower,upper) ranges.
*/
typedef std::vector<std::pair<BSONObj, BSONObj>> RangeVector;
/**
* Returns the overlap of a range [inclusiveLower, exclusiveUpper) with the provided range map
* as a vector of ranges from the map.
*/
void getRangeMapOverlap(const RangeMap& ranges,
const BSONObj& inclusiveLower,
const BSONObj& exclusiveUpper,
RangeVector* vector);
/**
* Returns true if the provided range map has ranges which overlap the provided range
* [inclusiveLower, exclusiveUpper).
*/
bool rangeMapOverlaps(const RangeMap& ranges,
const BSONObj& inclusiveLower,
const BSONObj& exclusiveUpper);
/**
* Returns true if the provided range map exactly contains the provided range
* [inclusiveLower, exclusiveUpper).
*/
bool rangeMapContains(const RangeMap& ranges,
const BSONObj& inclusiveLower,
const BSONObj& exclusiveUpper);
/**
* std::string representation of [inclusiveLower, exclusiveUpper)
*/
std::string rangeToString(const BSONObj& inclusiveLower, const BSONObj& exclusiveUpper);
/**
* std::string representation of overlapping ranges as a list "[range1),[range2),..."
*/
std::string overlapToString(RangeVector overlap);
} // namespace mongo
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