mirror of https://gitee.com/bigwinds/arangodb
103 lines
3.3 KiB
C++
103 lines
3.3 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 "ConnectedComponents.h"
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#include "Cluster/ClusterInfo.h"
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#include "Cluster/ServerState.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 MyComputation : public VertexComputation<int64_t, int64_t, int64_t> {
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MyComputation() {}
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void compute(MessageIterator<int64_t> const& messages) override {
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if (localSuperstep() == 0) {
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sendMessageToAllNeighbours(vertexData());
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} else {
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int64_t currentComponent = vertexData();
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for (const int64_t* msg : messages) {
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if (*msg < currentComponent) {
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currentComponent = *msg;
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};
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}
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if (currentComponent != vertexData()) {
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*mutableVertexData() = currentComponent;
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sendMessageToAllNeighbours(currentComponent);
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}
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voteHalt();
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}
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}
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};
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VertexComputation<int64_t, int64_t, int64_t>* ConnectedComponents::createComputation(
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WorkerConfig const* config) const {
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return new MyComputation();
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}
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struct MyGraphFormat final : public VertexGraphFormat<int64_t, int64_t> {
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uint64_t vertexIdRange = 0;
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explicit MyGraphFormat(std::string const& result)
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: VertexGraphFormat<int64_t, int64_t>(result, 0) {}
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void willLoadVertices(uint64_t count) override {
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// if we aren't running in a cluster it doesn't matter
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if (arangodb::ServerState::instance()->isRunningInCluster()) {
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arangodb::ClusterInfo* ci = arangodb::ClusterInfo::instance();
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if (ci) {
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vertexIdRange = ci->uniqid(count);
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}
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}
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}
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void copyVertexData(std::string const& documentId, arangodb::velocypack::Slice document,
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int64_t& targetPtr) override {
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targetPtr = vertexIdRange++;
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}
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};
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GraphFormat<int64_t, int64_t>* ConnectedComponents::inputFormat() const {
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return new MyGraphFormat(_resultField);
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}
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struct MyCompensation : public VertexCompensation<int64_t, int64_t, int64_t> {
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MyCompensation() {}
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void compensate(bool inLostPartition) override {
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// actually don't do anything, graph format will reinitialize lost vertices
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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>* ConnectedComponents::createCompensation(
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WorkerConfig const* config) const {
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return new MyCompensation();
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}
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