mirror of https://gitee.com/bigwinds/arangodb
127 lines
3.6 KiB
C++
127 lines
3.6 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2016 ArangoDB 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 Simon Grätzer
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////////////////////////////////////////////////////////////////////////////////
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#include <cstdint>
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#include <string>
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#include <velocypack/Builder.h>
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#include <velocypack/Slice.h>
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#include <velocypack/velocypack-aliases.h>
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#ifndef ARANGODB_PREGEL_AGGREGATOR_H
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#define ARANGODB_PREGEL_AGGREGATOR_H 1
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namespace arangodb {
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namespace pregel {
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class Aggregator {
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bool _permanent;
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Aggregator(const Aggregator&) = delete;
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Aggregator& operator=(const Aggregator&) = delete;
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public:
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Aggregator(bool perm = false) : _permanent(perm) {}
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virtual ~Aggregator() {}
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/// @brief Value from superstep S-1 supplied by the conductor
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virtual void aggregate(const void* valuePtr) = 0;
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virtual void aggregate(VPackSlice slice) = 0;
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virtual void const* getValue() const = 0;
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// virtual void setValue(VPackSlice slice) = 0;
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virtual VPackValue vpackValue() = 0;
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virtual void reset() {};
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virtual bool isPermanent() {return _permanent;}
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};
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class FloatMaxAggregator : public Aggregator {
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float _value, _initial;
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public:
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FloatMaxAggregator(float init) : _value(init), _initial(init) {}
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void aggregate(void const* valuePtr) override {
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float other = *((float*)valuePtr);
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if (other > _value) _value = other;
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};
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void aggregate(VPackSlice slice) override {
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float f = slice.getNumber<float>();
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aggregate(&f);
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}
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void const* getValue() const override { return &_value; };
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/*void setValue(VPackSlice slice) override {
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_value = (float)slice.getDouble();
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}*/
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VPackValue vpackValue() override { return VPackValue((double)_value); };
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void reset() override { _value = _initial; }
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};
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template<typename T>
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class ValueAggregator : public Aggregator {
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static_assert(std::is_arithmetic<T>::value, "Type must be numeric");
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T _value;
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public:
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ValueAggregator(T val) : Aggregator(true), _value(val) {}
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void aggregate(void const* valuePtr) override {
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_value = *((T*)valuePtr);
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};
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void aggregate(VPackSlice slice) override {
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_value = slice.getNumber<T>();
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}
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void const* getValue() const override { return &_value; };
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/*void setValue(VPackSlice slice) override {
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_value = (float)slice.getDouble();
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}*/
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VPackValue vpackValue() override { return VPackValue(_value); };
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};
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template<typename T>
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class SumAggregator : public Aggregator {
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static_assert(std::is_arithmetic<T>::value, "Type must be numeric");
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T _value;
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public:
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SumAggregator(T val) : Aggregator(true), _value(val) {}
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void aggregate(void const* valuePtr) override {
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_value += *((T*)valuePtr);
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};
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void aggregate(VPackSlice slice) override {
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_value += slice.getNumber<T>();
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}
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void const* getValue() const override { return &_value; };
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/*void setValue(VPackSlice slice) override {
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_value = (float)slice.getDouble();
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}*/
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VPackValue vpackValue() override { return VPackValue(_value); };
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};
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}
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}
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#endif
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