LinuxLog.java
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LinuxLog.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.SwhId;

	/**
	* Linux git log experiment to benchmark graph traversal.
	* <p>
	* The goal is to do the equivalent of a {@code git log} in the Linux kernel by following revisions
	* nodes.
	*
	* @author Thibault Allançon
	* @version 0.0.1
	* @since 0.0.1
	*/

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

	// A linux kernel commit on Sun Dec 31
	final SwhId commit = new SwhId("swh:1:rev:f39d7d78b70e0f39facb1e4fab77ad3df5c52a35");
	final long expectedCount = 723640;
	System.out.println("git log " + commit);
	System.out.println("Expecting " + expectedCount + " commits");

	long startTime = System.nanoTime();
	Endpoint endpoint = new Endpoint(graph, "forward", "rev:rev");
	long count = endpoint.visitNodes(commit).size();
	if (count != expectedCount) {
	throw new IllegalArgumentException("Counted " + count + " commits");
	}
	long endTime = System.nanoTime();
	double duration = (double) (endTime - startTime) / 1_000_000_000;
	System.out.println("Visit operation done in: " + duration + " seconds");
	}
	}