mirror of https://gitee.com/bigwinds/arangodb
114 lines
4.0 KiB
C++
114 lines
4.0 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
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/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
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///
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/// Licensed under the Apache License, Version 2.0 (the "License");
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/// you may not use this file except in compliance with the License.
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/// You may obtain a copy of the License at
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///
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/// http://www.apache.org/licenses/LICENSE-2.0
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///
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/// Unless required by applicable law or agreed to in writing, software
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/// distributed under the License is distributed on an "AS IS" BASIS,
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/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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/// See the License for the specific language governing permissions and
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/// limitations under the License.
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///
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/// Copyright holder is ArangoDB GmbH, Cologne, Germany
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///
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/// @author Jan Steemann
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGOD_CLUSTER_SHARDING_INFO_H
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#define ARANGOD_CLUSTER_SHARDING_INFO_H 1
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#include <unordered_set>
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#include <velocypack/Builder.h>
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#include <velocypack/Slice.h>
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namespace arangodb {
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class LogicalCollection;
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class ShardingStrategy;
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typedef std::string ServerID; // ID of a server
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typedef std::string ShardID; // ID of a shard
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typedef std::unordered_map<ShardID, std::vector<ServerID>> ShardMap;
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class ShardingInfo {
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public:
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ShardingInfo() = delete;
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ShardingInfo(arangodb::velocypack::Slice info, LogicalCollection* collection);
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ShardingInfo(ShardingInfo const& other, LogicalCollection* collection);
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ShardingInfo& operator=(ShardingInfo const& other) = delete;
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~ShardingInfo();
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bool usesSameShardingStrategy(ShardingInfo const* other) const;
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std::string shardingStrategyName() const;
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LogicalCollection* collection() const;
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void toVelocyPack(arangodb::velocypack::Builder& result, bool translateCids);
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std::string distributeShardsLike() const;
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void distributeShardsLike(std::string const& cid, ShardingInfo const* other);
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std::vector<std::string> const& avoidServers() const;
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void avoidServers(std::vector<std::string> const&);
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size_t replicationFactor() const;
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void replicationFactor(size_t);
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bool isSatellite() const;
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size_t numberOfShards() const;
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/// @brief update the number of shards. note that this method
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/// should never be called after a collection was properly initialized
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/// at the moment it is necessary to have it because of the collection
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/// class hierarchy. VirtualSmartEdgeCollection calls this function
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/// in its constructor, after the shardingInfo has been set up already
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void numberOfShards(size_t numberOfShards);
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bool usesDefaultShardKeys() const;
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std::vector<std::string> const& shardKeys() const;
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std::shared_ptr<ShardMap> shardIds() const;
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// return a filtered list of the collection's shards
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std::shared_ptr<ShardMap> shardIds(std::unordered_set<std::string> const& includedShards) const;
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void setShardMap(std::shared_ptr<ShardMap> const& map);
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int getResponsibleShard(arangodb::velocypack::Slice, bool docComplete,
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ShardID& shardID, bool& usesDefaultShardKeys,
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std::string const& key = "");
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private:
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// @brief the logical collection we are working for
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LogicalCollection* _collection;
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// @brief number of shards
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size_t _numberOfShards;
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// @brief replication factor (1 = no replication, 0 = smart edge collection)
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size_t _replicationFactor;
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// @brief name of other collection this collection's shards should be
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// distributed like
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std::string _distributeShardsLike;
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// @brief servers that will be ignored when distributing shards
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std::vector<std::string> _avoidServers;
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// @brief vector of shard keys in use. this is immutable after initial setup
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std::vector<std::string> _shardKeys;
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// @brief current shard ids
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std::shared_ptr<ShardMap> _shardIds;
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// @brief vector of shard keys in use. this is immutable after initial setup
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std::unique_ptr<ShardingStrategy> _shardingStrategy;
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};
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} // namespace arangodb
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#endif
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