org.neo4j.gds.influenceMaximization.CELFStreamSpec Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of proc-centrality Show documentation

Neo4j Graph Data Science :: Procedures :: Centrality

There is a newer version: 2.13.2

/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */
package org.neo4j.gds.influenceMaximization;

import com.carrotsearch.hppc.LongDoubleScatterMap;
import org.neo4j.gds.executor.AlgorithmSpec;
import org.neo4j.gds.executor.ComputationResultConsumer;
import org.neo4j.gds.executor.ExecutionContext;
import org.neo4j.gds.executor.GdsCallable;
import org.neo4j.gds.executor.NewConfigFunction;

import java.util.stream.LongStream;
import java.util.stream.Stream;

import static org.neo4j.gds.LoggingUtil.runWithExceptionLogging;
import static org.neo4j.gds.executor.ExecutionMode.STREAM;
import static org.neo4j.gds.influenceMaximization.CELFStreamProc.DESCRIPTION;

@GdsCallable(
    name = "gds.influenceMaximization.celf.stream",
    aliases = {"gds.beta.influenceMaximization.celf.stream"},
    description = DESCRIPTION,
    executionMode = STREAM
)
public class CELFStreamSpec implements AlgorithmSpec, CELFAlgorithmFactory> {

    @Override
    public String name() {
        return "CELFStream";
    }

    @Override
    public CELFAlgorithmFactory algorithmFactory(ExecutionContext executionContext) {
        return new CELFAlgorithmFactory<>();
    }

    @Override
    public NewConfigFunction newConfigFunction() {
        return (__, userInput) -> InfluenceMaximizationStreamConfig.of(userInput);
    }

    @Override
    public ComputationResultConsumer> computationResultConsumer() {
        return (computationResult, executionContext) -> runWithExceptionLogging(
            "Result streaming failed",
            executionContext.log(),
            () -> computationResult.result()
                .map(result -> {
                    var graph = computationResult.graph();
                    return LongStream.of(result.keys().toArray())
                        .mapToObj(node -> new StreamResult(
                            graph.toOriginalNodeId(node),
                            result.getOrDefault(node, 0)
                        ));
                })
                .orElseGet(Stream::empty)
        );
    }
}