mirror of https://gitee.com/bigwinds/arangodb
86 lines
2.7 KiB
C++
86 lines
2.7 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 "SSSP.h"
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#include "Pregel/Algorithm.h"
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#include "Pregel/GraphStore.h"
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#include "Pregel/IncomingCache.h"
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#include "Pregel/VertexComputation.h"
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using namespace arangodb::pregel;
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using namespace arangodb::pregel::algos;
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struct SSSPComputation : public VertexComputation<int64_t, int64_t, int64_t> {
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SSSPComputation() {}
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void compute(MessageIterator<int64_t> const& messages) override {
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int64_t tmp = vertexData();
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for (const int64_t* msg : messages) {
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if (*msg < tmp) {
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tmp = *msg;
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};
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}
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int64_t* state = mutableVertexData();
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if (tmp < *state || (tmp == 0 && localSuperstep() == 0)) {
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*state = tmp; // update state
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RangeIterator<Edge<int64_t>> edges = getEdges();
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for (Edge<int64_t>* edge : edges) {
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int64_t val = *edge->data() + tmp;
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sendMessage(edge, val);
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}
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}
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voteHalt();
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}
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};
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GraphFormat<int64_t, int64_t>* SSSPAlgorithm::inputFormat() {
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return new NumberGraphFormat<int64_t, int64_t> (_sourceField, _resultField, INT64_MAX, 1);
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}
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MessageFormat<int64_t>* SSSPAlgorithm::messageFormat() const {
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return new IntegerMessageFormat();
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}
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MessageCombiner<int64_t>* SSSPAlgorithm::messageCombiner() const {
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return new MinCombiner<int64_t>();
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}
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VertexComputation<int64_t, int64_t, int64_t>* SSSPAlgorithm::createComputation(
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WorkerConfig const* config) const {
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return new SSSPComputation();
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}
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struct SSSPCompensation : public VertexCompensation<int64_t, int64_t, int64_t> {
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SSSPCompensation() {}
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void compensate(bool inLostPartition) override {
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if (inLostPartition) {
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int64_t* data = mutableVertexData();
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*data = INT64_MAX;
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}
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}
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};
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VertexCompensation<int64_t, int64_t, int64_t>*
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SSSPAlgorithm::createCompensation(WorkerConfig const* config) const {
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return new SSSPCompensation();
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}
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