mirror of https://gitee.com/bigwinds/arangodb
125 lines
3.6 KiB
C++
125 lines
3.6 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2014-2017 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 Daniel H. Larkin
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGO_ROCKSDB_ROCKSDB_REPLICATION_CONTEXT_H
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#define ARANGO_ROCKSDB_ROCKSDB_REPLICATION_CONTEXT_H 1
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#include "Basics/Common.h"
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#include "Basics/Result.h"
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#include "Indexes/IndexIterator.h"
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#include "RocksDBEngine/RocksDBToken.h"
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#include "Transaction/Methods.h"
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#include "VocBase/vocbase.h"
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#include <velocypack/Slice.h>
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#include <velocypack/velocypack-aliases.h>
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namespace arangodb {
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class RocksDBReplicationResult : public Result {
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public:
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RocksDBReplicationResult(int, uint64_t);
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uint64_t maxTick() const;
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private:
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uint64_t _maxTick;
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};
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/// ttl in seconds
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double RocksDBReplicationContextTTL = 30 * 60.0;
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class RocksDBReplicationContext {
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private:
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typedef std::function<void(DocumentIdentifierToken const& token)>
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TokenCallback;
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public:
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RocksDBReplicationContext();
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TRI_voc_tick_t id() const;
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// creates new transaction/snapshot, returns inventory
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std::pair<RocksDBReplicationResult, std::shared_ptr<VPackBuilder>>
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getInventory(TRI_vocbase_t* vocbase, bool includeSystem);
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// iterates over at most 'limit' documents in the collection specified,
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// creating a new iterator if one does not exist for this collection
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std::pair<RocksDBReplicationResult, bool> dump(
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TRI_vocbase_t* vocbase, std::string const& collectionName,
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TokenCallback cb, size_t limit);
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// iterates over WAL starting at 'from' and returns up to 'limit' documents
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// from the corresponding database
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RocksDBReplicationResult tail(TRI_vocbase_t* vocbase, uint64_t from,
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size_t limit, VPackBuilder& builder);
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double expires() const { return _expires; }
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bool isDeleted() const { return _isDeleted; }
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void deleted() { _isDeleted = true; }
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bool isUsed() const { return _isUsed; }
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void use() {
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TRI_ASSERT(!_isDeleted);
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TRI_ASSERT(!_isUsed);
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_isUsed = true;
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_expires = TRI_microtime() + RocksDBReplicationContextTTL;
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}
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/// remove use flag
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void release() {
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TRI_ASSERT(_isUsed);
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_isUsed = false;
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}
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private:
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std::unique_ptr<transaction::Methods> createTransaction(
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TRI_vocbase_t* vocbase);
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static bool filterCollection(arangodb::LogicalCollection* collection,
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void* data);
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static bool sortCollections(arangodb::LogicalCollection const* l,
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arangodb::LogicalCollection const* r);
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private:
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TRI_voc_tick_t _id;
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uint64_t _lastTick;
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std::unique_ptr<transaction::Methods> _trx;
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LogicalCollection* _collection;
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std::unique_ptr<IndexIterator> _iter;
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ManagedDocumentResult _mdr;
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double _expires;
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bool _isDeleted;
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bool _isUsed;
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};
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} // namespace arangodb
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#endif
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