mirror of https://gitee.com/bigwinds/arangodb
116 lines
4.2 KiB
C++
116 lines
4.2 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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/// @author Jan Steemann
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/// @author Jan Christoph Uhde
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGO_ROCKSDB_ROCKSDB_COMMON_H
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#define ARANGO_ROCKSDB_ROCKSDB_COMMON_H 1
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#include "Basics/Common.h"
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#include "Basics/Result.h"
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#include "Basics/RocksDBUtils.h"
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#include "RocksDBEngine/RocksDBComparator.h"
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#include "RocksDBEngine/RocksDBEngine.h"
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#include "RocksDBEngine/RocksDBKey.h"
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#include "RocksDBEngine/RocksDBKeyBounds.h"
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#include "RocksDBEngine/RocksDBTypes.h"
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#include "RocksDBEngine/RocksDBValue.h"
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#include <rocksdb/iterator.h>
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#include <rocksdb/options.h>
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#include <rocksdb/status.h>
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#include <rocksdb/utilities/transaction_db.h>
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namespace rocksdb {
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class Comparator;
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class ColumnFamilyHandle;
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class DB;
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class Iterator;
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struct ReadOptions;
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class TransactionDB;
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} // namespace rocksdb
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namespace arangodb {
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class RocksDBMethods;
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class RocksDBKeyBounds;
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class RocksDBEngine;
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namespace rocksutils {
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rocksdb::TransactionDB* globalRocksDB();
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rocksdb::ColumnFamilyHandle* defaultCF();
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RocksDBEngine* globalRocksEngine();
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arangodb::Result globalRocksDBPut(rocksdb::ColumnFamilyHandle* cf,
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rocksdb::Slice const& key, rocksdb::Slice const& value,
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rocksdb::WriteOptions const& = rocksdb::WriteOptions{});
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arangodb::Result globalRocksDBRemove(rocksdb::ColumnFamilyHandle* cf,
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rocksdb::Slice const& key,
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rocksdb::WriteOptions const& = rocksdb::WriteOptions{});
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uint64_t latestSequenceNumber();
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/// @brief throws an exception of appropriate type if the iterator's status is !ok().
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/// does nothing if the iterator's status is ok().
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/// this function can be used by IndexIterators to verify that an iterator is still
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/// in good shape
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void checkIteratorStatus(rocksdb::Iterator const* iterator);
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std::pair<TRI_voc_tick_t, TRI_voc_cid_t> mapObjectToCollection(uint64_t);
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RocksDBEngine::IndexTriple mapObjectToIndex(uint64_t);
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/// @brief count all keys in the given column family
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std::size_t countKeys(rocksdb::DB*, rocksdb::ColumnFamilyHandle* cf);
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/// @brief iterate over all keys in range and count them
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std::size_t countKeyRange(rocksdb::DB*, RocksDBKeyBounds const&, bool prefix_same_as_start);
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/// @brief helper method to remove large ranges of data
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/// Should mainly be used to implement the drop() call
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Result removeLargeRange(rocksdb::DB* db, RocksDBKeyBounds const& bounds,
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bool prefixSameAsStart, bool useRangeDelete);
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// optional switch to std::function to reduce amount of includes and
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// to avoid template
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// this helper is not meant for transactional usage!
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template <typename T> // T is an invokeable that takes a rocksdb::Iterator*
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void iterateBounds(RocksDBKeyBounds const& bounds, T callback,
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rocksdb::ReadOptions options = rocksdb::ReadOptions()) {
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rocksdb::Slice const end = bounds.end();
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options.iterate_upper_bound = &end; // save to use on rocksb::DB directly
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options.prefix_same_as_start = true;
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options.verify_checksums = false;
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options.fill_cache = false;
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std::unique_ptr<rocksdb::Iterator> it(
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globalRocksDB()->NewIterator(options, bounds.columnFamily()));
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for (it->Seek(bounds.start()); it->Valid(); it->Next()) {
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callback(it.get());
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}
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}
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} // namespace rocksutils
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} // namespace arangodb
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#endif
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