mirror of https://gitee.com/bigwinds/arangodb
116 lines
3.8 KiB
C++
116 lines
3.8 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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#ifndef ARANGODB_PREGEL_MASTER_CONTEXT_H
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#define ARANGODB_PREGEL_MASTER_CONTEXT_H 1
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#include <velocypack/Slice.h>
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#include "Basics/Common.h"
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#include "Pregel/AggregatorHandler.h"
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namespace arangodb {
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namespace pregel {
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class Conductor;
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class MasterContext {
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friend class Conductor;
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uint64_t _globalSuperstep = 0;
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uint64_t _vertexCount = 0;
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uint64_t _edgeCount = 0;
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// Should cause the master to tell everyone to enter the next phase
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bool _enterNextGSS = false;
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AggregatorHandler* _aggregators = nullptr;
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public:
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MasterContext() {}
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virtual ~MasterContext() {}
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inline uint64_t globalSuperstep() const { return _globalSuperstep; }
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/// current global vertex count, might change after each gss
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inline uint64_t vertexCount() const { return _vertexCount; }
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/// current global edge count, might change after each gss
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inline uint64_t edgeCount() const { return _edgeCount; }
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template <typename T>
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inline void aggregate(std::string const& name, T const& value) {
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T const* ptr = &value;
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_aggregators->aggregate(name, ptr);
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}
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template <typename T>
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inline const T* getAggregatedValue(std::string const& name) {
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return (const T*)_aggregators->getAggregatedValue(name);
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}
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template <typename T>
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inline void setAggregatedValue(std::string const& name, T const& value) {
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// FIXME refactor the aggregators, this whole API is horrible
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arangodb::velocypack::Builder b;
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b.openObject();
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b.add("aggregators",
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arangodb::velocypack::Value(arangodb::velocypack::ValueType::Object));
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b.add(name, arangodb::velocypack::Value(value));
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b.close();
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b.close();
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_aggregators->setAggregatedValues(b.slice());
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}
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template <typename T>
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inline T* getAggregator(std::string const& name) {
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#ifdef ARANGODB_ENABLE_MAINTAINER_MODE
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return dynamic_cast<T*>(_aggregators->getAggregator(name));
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#else
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return reinterpret_cast<T*>(_aggregators->getAggregator(name));
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#endif
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}
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inline void enterNextGlobalSuperstep() { _enterNextGSS = true; }
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virtual void preApplication() {}
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/// @brief called before supersteps
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/// @return true to continue the computation
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virtual void preGlobalSuperstep() {}
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/// @brief called after supersteps
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/// @return true to continue the computation
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virtual bool postGlobalSuperstep() { return true; };
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virtual void postApplication() {}
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/// Called when a worker send updated aggregator values.
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/// Only called in async mode, never called after a global superstep
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/// Can be used to decide to enter the next phase
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virtual void postLocalSuperstep() {}
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/// should indicate if compensation is supposed to start by returning true
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virtual bool preCompensation() { return true; }
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/// should indicate if compensation is finished, by returning false.
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/// otherwise workers will be called again with the aggregated values
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virtual bool postCompensation() { return false; }
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};
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} // namespace pregel
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} // namespace arangodb
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#endif
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