mirror of https://gitee.com/bigwinds/arangodb
75 lines
2.6 KiB
C++
75 lines
2.6 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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#ifndef ARANGODB_PREGEL_ALGOS_SSSP_H
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#define ARANGODB_PREGEL_ALGOS_SSSP_H 1
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#include "Pregel/Algorithm.h"
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namespace arangodb {
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namespace pregel {
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namespace algos {
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/// Single Source Shortest Path. Uses integer attribute 'value', the source
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/// should have
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/// the value == 0, all others -1 or an undefined value
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class SSSPAlgorithm : public Algorithm<int64_t, int64_t, int64_t> {
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std::string _sourceDocumentId, _resultField = "result";
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public:
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explicit SSSPAlgorithm(application_features::ApplicationServer& server, VPackSlice userParams)
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: Algorithm(server, "SSSP") {
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if (!userParams.isObject() || !userParams.hasKey("source")) {
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THROW_ARANGO_EXCEPTION_MESSAGE(
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TRI_ERROR_BAD_PARAMETER,
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"You need to specify the source document id");
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}
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_sourceDocumentId = userParams.get("source").copyString();
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VPackSlice slice = userParams.get("_resultField");
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if (slice.isString()) {
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_resultField = slice.copyString();
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}
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}
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bool supportsAsyncMode() const override { return true; }
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bool supportsCompensation() const override { return true; }
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GraphFormat<int64_t, int64_t>* inputFormat() const override;
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MessageFormat<int64_t>* messageFormat() const override {
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return new IntegerMessageFormat();
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}
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MessageCombiner<int64_t>* messageCombiner() const override {
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return new MinCombiner<int64_t>();
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}
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VertexComputation<int64_t, int64_t, int64_t>* createComputation(WorkerConfig const*) const override;
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VertexCompensation<int64_t, int64_t, int64_t>* createCompensation(WorkerConfig const*) const override;
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uint32_t messageBatchSize(WorkerConfig const& config, MessageStats const& stats) const override;
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};
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} // namespace algos
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} // namespace pregel
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} // namespace arangodb
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#endif
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