mirror of https://gitee.com/bigwinds/arangodb
134 lines
4.3 KiB
C++
134 lines
4.3 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 Max Neunhoeffer
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGOD_UTILS_OPERATION_CURSOR_H
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#define ARANGOD_UTILS_OPERATION_CURSOR_H 1
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#include "Basics/Common.h"
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#include "Indexes/IndexIterator.h"
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#include "Utils/OperationResult.h"
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#include <velocypack/Buffer.h>
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#include <velocypack/Builder.h>
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#include <velocypack/Options.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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// FORWARD declaration
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class IndexIterator;
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struct OperationCursor : public OperationResult {
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private:
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std::shared_ptr<IndexIterator> _indexIterator;
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bool _hasMore;
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uint64_t _limit;
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uint64_t const _originalLimit;
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uint64_t const _batchSize;
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public:
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explicit OperationCursor(int code)
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: OperationResult(code), _hasMore(false), _limit(0), _originalLimit(0), _batchSize(1000) {
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}
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OperationCursor(int code, std::string const& message)
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: OperationResult(code, message), _hasMore(false), _limit(0), _originalLimit(0), _batchSize(1000) {
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}
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OperationCursor(std::shared_ptr<VPackBuffer<uint8_t>> buffer,
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std::shared_ptr<VPackCustomTypeHandler> handler,
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std::string const& message,
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int code,
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bool wasSynchronous)
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: OperationResult(buffer, handler, message, code, wasSynchronous),
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_hasMore(false),
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_limit(0),
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_originalLimit(0),
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_batchSize(1000) {
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}
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OperationCursor(std::shared_ptr<VPackCustomTypeHandler> handler, IndexIterator* iterator,
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uint64_t limit, uint64_t batchSize)
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: OperationResult(std::make_shared<VPackBuffer<uint8_t>>(), handler, "",
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TRI_ERROR_NO_ERROR, false),
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_indexIterator(iterator),
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_hasMore(true),
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_limit(limit), // _limit is modified later on
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_originalLimit(limit),
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_batchSize(batchSize) {
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if (_indexIterator == nullptr) {
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_hasMore = false;
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}
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}
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~OperationCursor() {
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}
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IndexIterator* indexIterator() const {
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return _indexIterator.get();
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}
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bool hasMore() const {
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return _hasMore;
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}
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//////////////////////////////////////////////////////////////////////////////
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/// @brief Reset the cursor
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//////////////////////////////////////////////////////////////////////////////
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void reset();
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//////////////////////////////////////////////////////////////////////////////
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/// @brief Get next batchSize many elements.
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/// Check hasMore()==true before using this
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/// NOTE: This will throw on OUT_OF_MEMORY
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//////////////////////////////////////////////////////////////////////////////
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int getMore(uint64_t, bool useExternals = false);
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//////////////////////////////////////////////////////////////////////////////
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/// @brief Get next default batchSize many elements.
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/// Check hasMore()==true before using this
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/// NOTE: This will throw on OUT_OF_MEMORY
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//////////////////////////////////////////////////////////////////////////////
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int getMore();
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//////////////////////////////////////////////////////////////////////////////
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/// @brief Skip the next toSkip many elements.
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/// skipped will be increased by the amount of skipped elements afterwards
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/// Check hasMore()==true before using this
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/// NOTE: This will throw on OUT_OF_MEMORY
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//////////////////////////////////////////////////////////////////////////////
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int skip(uint64_t, uint64_t&);
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};
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}
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#endif
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