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yacy_search_server/test/java/net/yacy/visualization/CircleToolTest.java

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// CircleToolTest.java
// Copyright 2018 by luccioman; https://github.com/luccioman
//
// This is a part of YaCy, a peer-to-peer based web search engine
//
// LICENSE
//
// This program 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 2 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, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
package net.yacy.visualization;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import org.bouncycastle.util.Arrays;
import org.junit.Assert;
import org.junit.Test;
import net.yacy.peers.graphics.EncodedImage;
/**
* Unit tests for the {@link CircleTool} class.
*/
public class CircleToolTest {
/**
* Check circle function consistency when run on multiple concurrent threads.
*
* @throws Exception when an unexpected error occurred
*/
@Test
public void testCircleConcurrentConsistency() throws Exception {
final int concurrency = 20;
final int side = 600;
final String ext = "png";
final Callable<byte[]> drawTask = () -> {
final RasterPlotter raster = new RasterPlotter(side, side, RasterPlotter.DrawMode.MODE_SUB, "FFFFFF");
for (int radius = side / 4; radius < side / 2; radius++) {
raster.setColor(RasterPlotter.GREEN);
CircleTool.circle(raster, side / 2, side / 2, radius, 100);
raster.setColor(RasterPlotter.RED);
CircleTool.circle(raster, side / 2, side / 2, radius, 0, 45);
}
final EncodedImage image = new EncodedImage(raster, ext, true);
return image.getImage().getBytes();
};
/* Generate a reference image without concurrency */
CircleTool.clearcache();
final byte[] refImageBytes = drawTask.call();
/* Write the reference image to the file system to enable manual visual check */
final Path outputPath = Paths.get(System.getProperty("java.io.tmpdir", ""), "CircleToolTest." + ext);
try {
Files.write(outputPath, refImageBytes);
System.out.println("Wrote CircleTool.circle() test image to file " + outputPath.toAbsolutePath());
} catch (final IOException e) {
/*
* Even if output file writing failed we do not make the test fail as this is
* not the purpose of the test
*/
e.printStackTrace();
}
/*
* Generate the same image multiple times in concurrent threads without initial
* cache
*/
CircleTool.clearcache();
final ExecutorService executor = Executors.newFixedThreadPool(concurrency);
final ArrayList<Future<byte[]>> futures = new ArrayList<>();
for (int i = 0; i < concurrency; i++) {
futures.add(executor.submit(drawTask));
}
try {
for (final Future<byte[]> future : futures) {
/* Check that all concurrently generated images are equal to the reference */
final byte[] imageBytes = future.get();
if (!Arrays.areEqual(refImageBytes, imageBytes)) {
/* Write the image in error to file system to enable manual visual check */
final Path errOutputPath = Paths.get(System.getProperty("java.io.tmpdir", ""),
"CircleToolTestError." + ext);
try {
Files.write(errOutputPath, imageBytes);
System.out.println(
"Wrote CircleTool.circle() error image to file " + errOutputPath.toAbsolutePath());
} catch (final IOException e) {
e.printStackTrace();
}
Assert.fail();
}
}
} finally {
executor.shutdown();
}
}
}