mirror of https://gitee.com/bigwinds/arangodb
115 lines
3.1 KiB
C++
115 lines
3.1 KiB
C++
////////////////////////////////////////////////////////////////////////////////
|
|
/// DISCLAIMER
|
|
///
|
|
/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
|
|
/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
|
|
///
|
|
/// Licensed under the Apache License, Version 2.0 (the "License");
|
|
/// you may not use this file except in compliance with the License.
|
|
/// You may obtain a copy of the License at
|
|
///
|
|
/// http://www.apache.org/licenses/LICENSE-2.0
|
|
///
|
|
/// Unless required by applicable law or agreed to in writing, software
|
|
/// distributed under the License is distributed on an "AS IS" BASIS,
|
|
/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
/// See the License for the specific language governing permissions and
|
|
/// limitations under the License.
|
|
///
|
|
/// Copyright holder is ArangoDB GmbH, Cologne, Germany
|
|
///
|
|
/// @author Jan Steemann
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
#ifndef ARANGOD_AQL_AQL_ITEM_BLOCK_MANAGER_H
|
|
#define ARANGOD_AQL_AQL_ITEM_BLOCK_MANAGER_H 1
|
|
|
|
#include "Aql/AqlItemBlockSerializationFormat.h"
|
|
#include "Aql/types.h"
|
|
#include "Basics/Common.h"
|
|
|
|
#include <array>
|
|
#include <cstddef>
|
|
|
|
namespace arangodb {
|
|
|
|
namespace velocypack {
|
|
class Slice;
|
|
}
|
|
|
|
namespace aql {
|
|
|
|
class AqlItemBlock;
|
|
class SharedAqlItemBlockPtr;
|
|
struct ResourceMonitor;
|
|
|
|
class AqlItemBlockManager {
|
|
friend class SharedAqlItemBlockPtr;
|
|
|
|
public:
|
|
/// @brief create the manager
|
|
explicit AqlItemBlockManager(ResourceMonitor*, SerializationFormat format);
|
|
|
|
/// @brief destroy the manager
|
|
TEST_VIRTUAL ~AqlItemBlockManager();
|
|
|
|
public:
|
|
/// @brief request a block with the specified size
|
|
TEST_VIRTUAL SharedAqlItemBlockPtr requestBlock(size_t nrItems, RegisterId nrRegs);
|
|
|
|
/// @brief request a block and initialize it from the slice
|
|
TEST_VIRTUAL SharedAqlItemBlockPtr requestAndInitBlock(velocypack::Slice slice);
|
|
|
|
TEST_VIRTUAL ResourceMonitor* resourceMonitor() const noexcept;
|
|
|
|
SerializationFormat getFormatType() const { return _format; }
|
|
|
|
#ifdef ARANGODB_USE_GOOGLE_TESTS
|
|
// Only used for the mocks in the catch tests. Other code should always use
|
|
// SharedAqlItemBlockPtr which in turn call returnBlock()!
|
|
static void deleteBlock(AqlItemBlock* block);
|
|
#endif
|
|
|
|
#ifndef ARANGODB_USE_GOOGLE_TESTS
|
|
protected:
|
|
#else
|
|
// make returnBlock public for tests so it can be mocked
|
|
public:
|
|
#endif
|
|
/// @brief return a block to the manager
|
|
/// Should only be called by SharedAqlItemBlockPtr!
|
|
TEST_VIRTUAL void returnBlock(AqlItemBlock*& block) noexcept;
|
|
|
|
private:
|
|
ResourceMonitor* _resourceMonitor;
|
|
SerializationFormat const _format;
|
|
|
|
static constexpr size_t numBuckets = 12;
|
|
static constexpr size_t numBlocksPerBucket = 7;
|
|
|
|
struct Bucket {
|
|
std::array<AqlItemBlock*, numBlocksPerBucket> blocks;
|
|
size_t numItems;
|
|
|
|
Bucket();
|
|
~Bucket();
|
|
|
|
bool empty() const noexcept;
|
|
|
|
bool full() const noexcept;
|
|
|
|
AqlItemBlock* pop() noexcept;
|
|
|
|
void push(AqlItemBlock* block) noexcept;
|
|
|
|
static size_t getId(size_t targetSize) noexcept;
|
|
};
|
|
|
|
Bucket _buckets[numBuckets];
|
|
};
|
|
|
|
} // namespace aql
|
|
} // namespace arangodb
|
|
|
|
#endif
|