Differential D1846 Diff 6214 java/server/src/main/java/org/softwareheritage/graph/benchmark/Browsing.java

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				package org.softwareheritage.graph.benchmark;

				import java.io.IOException;

				import org.softwareheritage.graph.Endpoint;
				import org.softwareheritage.graph.Graph;
				import org.softwareheritage.graph.Node;
				import org.softwareheritage.graph.benchmark.Common;
				import org.softwareheritage.graph.utils.Random;

				/**
				* Benchmark Software Heritage browsing use-cases scenarios: <a
				* href="https://docs.softwareheritage.org/devel/swh-graph/use-cases.html">use cases</a>.
				*
				* @author Thibault Allançon
				* @version 0.0.1
				* @since 0.0.1
				*/

				public class Browsing {
				/**
				* Main entrypoint.
				*
				* @param args command line arguments
				*/
				public static void main(String[] args) throws IOException {
				String path = args[0];
				Graph graph = new Graph(path);

				final long seed = 42;
				final int nbNodes = 100_000;
				Random random = new Random(seed);
				long[] dirNodeIds = random.generateNodeIdsOfType(graph, nbNodes, Node.Type.DIR);
				long[] revNodeIds = random.generateNodeIdsOfType(graph, nbNodes, Node.Type.REV);

				Endpoint dirEndpoint = new Endpoint(graph, "forward", "dir:cnt,dir:dir");
				Endpoint revEndpoint = new Endpoint(graph, "forward", "rev:rev");

				System.out.println("Used " + nbNodes + " random nodes (results are in seconds):");
				System.out.println("\n'ls' use-case");
				Common.timeEndpoint(graph, dirNodeIds, dirEndpoint::neighbors);
				System.out.println("\n'ls -R' use-case");
				Common.timeEndpoint(graph, dirNodeIds, dirEndpoint::visitPaths);
				System.out.println("\n'git log' use-case");
				Common.timeEndpoint(graph, revNodeIds, revEndpoint::visitNodes);
				}
				}