move scatter plot creation into an AggregateHandler

pdb-plotting/src/main/java/org/lucares/pdb/plot/api/AggregateHandler.java

@@ -23,6 +23,6 @@ public interface AggregateHandler {
 
 	void addPlotsAfterScatter(StringBuilder result, Collection<DataSeries> dataSeries);
 
-	CustomAggregator createCustomAggregator(Path tmpDir, long fromEpochMilli, long toEpochMilli);
+	CustomAggregator createCustomAggregator(Path tmpDir, PlotSettings plotSettings, long fromEpochMilli, long toEpochMilli);
 
 }

pdb-plotting/src/main/java/org/lucares/pdb/plot/api/CumulativeDistributionCustomAggregator.java

@@ -78,7 +78,7 @@ public class CumulativeDistributionCustomAggregator implements CustomAggregator
 	}
 
 	@Override
-	public void addValue(final long epochMilli, final long value) {
+	public void addValue(boolean valueIsInYRange, final long epochMilli, final long value) {
 		map.compute(value, 0, l -> l + 1);
 		totalValues++;
 	}

pdb-plotting/src/main/java/org/lucares/pdb/plot/api/CumulativeDistributionHandler.java

@@ -9,7 +9,7 @@ import org.lucares.recommind.logs.LineStyle;
 public class CumulativeDistributionHandler implements AggregateHandler {
 
 	@Override
-	public CustomAggregator createCustomAggregator(final Path tmpDir, final long fromEpochMilli,
+	public CustomAggregator createCustomAggregator(final Path tmpDir, PlotSettings plotSettings, final long fromEpochMilli,
 			final long toEpochMilli) {
 		return new CumulativeDistributionCustomAggregator(tmpDir);
 	}

pdb-plotting/src/main/java/org/lucares/pdb/plot/api/CustomAggregator.java

@@ -4,8 +4,7 @@ import java.io.IOException;
 
 public interface CustomAggregator {
 
-	void addValue(long epochMilli, long value);
+  void addValue(boolean valueIsInYRange, long epochMilli, long value);
-
-	AggregatedData getAggregatedData() throws IOException;
 
+  AggregatedData getAggregatedData() throws IOException;
 }

pdb-plotting/src/main/java/org/lucares/pdb/plot/api/NullAggregate.java

@@ -24,7 +24,7 @@ public class NullAggregate implements AggregateHandler {
 	}
 
 	@Override
-	public CustomAggregator createCustomAggregator(final Path tmpDir, final long fromEpochMilli,
+	public CustomAggregator createCustomAggregator(final Path tmpDir, PlotSettings plotSettings, final long fromEpochMilli,
 			final long toEpochMilli) {
 		return new NullCustomAggregator();
 	}

pdb-plotting/src/main/java/org/lucares/pdb/plot/api/NullCustomAggregator.java

@@ -3,7 +3,7 @@ package org.lucares.pdb.plot.api;
 public class NullCustomAggregator implements CustomAggregator {
 
 	@Override
-	public void addValue(final long epochMilli, final long value) {
+	public void addValue(boolean valueIsInYRange,final long epochMilli, final long value) {
 		// nothing to do; this is a null-object
 
 	}

pdb-plotting/src/main/java/org/lucares/pdb/plot/api/ParallelRequestsAggregate.java

@@ -35,7 +35,7 @@ public class ParallelRequestsAggregate implements AggregateHandler {
 	}
 
 	@Override
-	public CustomAggregator createCustomAggregator(final Path tmpDir, final long fromEpochMilli,
+	public CustomAggregator createCustomAggregator(final Path tmpDir, PlotSettings plotSettings, final long fromEpochMilli,
 			final long toEpochMilli) {
 		if ((toEpochMilli - fromEpochMilli) <= TimeUnit.HOURS.toMillis(5)) {
 			return new ParallelRequestsAggregator(tmpDir, fromEpochMilli, toEpochMilli);

pdb-plotting/src/main/java/org/lucares/pdb/plot/api/ParallelRequestsAggregator.java

@@ -39,7 +39,7 @@ public class ParallelRequestsAggregator implements CustomAggregator {
 	}
 
 	@Override
-	public void addValue(final long epochMilli, final long value) {
+	public void addValue(boolean valueIsInYRange,final long epochMilli, final long value) {
 
 		final int endPos = (int) (epochMilli - fromEpochMilli);
 		increments[endPos]--;

pdb-plotting/src/main/java/org/lucares/pdb/plot/api/ScatterAggregateHandler.java

@@ -0,0 +1,47 @@
+package org.lucares.pdb.plot.api;
+
+import java.nio.file.Path;
+import java.util.Collection;
+
+import org.lucares.recommind.logs.DataSeries;
+import org.lucares.recommind.logs.GnuplotLineType;
+
+public class ScatterAggregateHandler implements AggregateHandler {
+
+  @Override
+  public void addGnuplotDefinitions(StringBuilder result, String separator, Collection<DataSeries> dataSeries) {
+    // TODO Auto-generated method stub
+
+  }
+
+  @Override
+  public void addPlotsBeforeScatter(StringBuilder result, Collection<DataSeries> dataSeries) {
+
+    for (final DataSeries dataSerie : dataSeries) {
+      final AggregatedData aggregatedData = dataSerie.getAggregatedData();
+      if (aggregatedData != null) {
+
+        appendfln(result, "'%s' using 1:2 title '%s' with %s %s, \\", //
+            aggregatedData.getDataFile(), //
+            dataSerie.getTitle(), //
+            GnuplotLineType.Points,
+            dataSerie.getStyle()//
+        );
+      }
+    }
+
+  }
+
+  @Override
+  public void addPlotsAfterScatter(StringBuilder result, Collection<DataSeries> dataSeries) {
+    // TODO Auto-generated method stub
+
+  }
+
+  @Override
+  public CustomAggregator createCustomAggregator(Path tmpDir, PlotSettings plotSettings, long fromEpochMilli,
+      long toEpochMilli) {
+
+    return new ScatterAggregator(tmpDir, plotSettings, fromEpochMilli, toEpochMilli);
+  }
+}

pdb-plotting/src/main/java/org/lucares/pdb/plot/api/ScatterAggregator.java

@@ -0,0 +1,94 @@
+package org.lucares.pdb.plot.api;
+
+import java.io.BufferedWriter;
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.OutputStreamWriter;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Path;
+import java.util.Formatter;
+import java.util.concurrent.TimeUnit;
+
+import org.lucares.collections.Sparse2DLongArray;
+import org.lucares.recommind.logs.GnuplotSettings;
+import org.lucares.recommind.logs.LambdaFriendlyWriter;
+import org.lucares.recommind.logs.LongUtils;
+
+public class ScatterAggregator implements CustomAggregator {
+
+  private final Sparse2DLongArray matrix2d = new Sparse2DLongArray();
+
+  private final boolean useMillis;
+  private final long plotAreaWidthInPx;
+  private final long plotAreaHeightInPx;
+  private final long epochMillisPerPixel;
+
+  private final long minValue;
+  private final long maxValue;
+  private final long durationMillisPerPixel;
+
+  private Path tmpDir;
+
+  public ScatterAggregator(Path tmpDir, PlotSettings plotSettings, long fromEpochMilli, long toEpochMilli) {
+
+    this.tmpDir = tmpDir;
+    useMillis = (toEpochMilli - fromEpochMilli) < TimeUnit.MINUTES.toMillis(5);
+    plotAreaWidthInPx = plotSettings.getWidth() - GnuplotSettings.GNUPLOT_LEFT_RIGHT_MARGIN;
+    plotAreaHeightInPx = plotSettings.getHeight() - GnuplotSettings.GNUPLOT_TOP_BOTTOM_MARGIN;
+    epochMillisPerPixel = Math.max(1, (toEpochMilli - fromEpochMilli) / plotAreaWidthInPx);
+
+    minValue = plotSettings.getYRangeUnit() == TimeRangeUnitInternal.AUTOMATIC ? 0
+        : plotSettings.getYRangeUnit().toMilliSeconds(plotSettings.getYRangeMin());
+    maxValue = plotSettings.getYRangeUnit() == TimeRangeUnitInternal.AUTOMATIC ? Long.MAX_VALUE
+        : plotSettings.getYRangeUnit().toMilliSeconds(plotSettings.getYRangeMax());
+    durationMillisPerPixel = plotSettings.getYAxisScale() == AxisScale.LINEAR
+        ? Math.max(1, (maxValue - minValue) / plotAreaHeightInPx)
+        : 1;
+  }
+
+  @Override
+  public void addValue(boolean valueIsInYRange, long epochMilli, long value) {
+    final long roundedEpochMilli = epochMilli - epochMilli % epochMillisPerPixel;
+    final long roundedValue = value - value % durationMillisPerPixel;
+    matrix2d.put(roundedEpochMilli, roundedValue, 1);
+  }
+
+  @Override
+  public AggregatedData getAggregatedData() throws IOException {
+
+    final File dataFile = File.createTempFile("data", ".dat", tmpDir.toFile());
+    final int separator = ',';
+    final int newline = '\n';
+
+    long[] actualValuesWritten = new long[1];
+    final StringBuilder formattedDateBuilder = new StringBuilder();
+    try (
+        final LambdaFriendlyWriter output = new LambdaFriendlyWriter(
+            new BufferedWriter(new OutputStreamWriter(new FileOutputStream(dataFile), StandardCharsets.ISO_8859_1)));
+        final Formatter formatter = new Formatter(formattedDateBuilder);) {
+
+      matrix2d.forEach((epochMilli, value, __) -> {
+
+        final String stringValue = LongUtils.longToString(value);
+        final String formattedDate;
+
+        if (useMillis) {
+          formattedDateBuilder.delete(0, formattedDateBuilder.length());
+          formatter.format("%.3f", epochMilli / 1000.0);
+          formattedDate = formattedDateBuilder.toString();
+        } else {
+          formattedDate = String.valueOf(epochMilli / 1000);
+        }
+
+        output.write(formattedDate);
+        output.write(separator);
+        output.write(stringValue);
+        output.write(newline);
+        actualValuesWritten[0]++;
+      });
+    }
+
+    return new AggregatedData("scatter", dataFile);
+  }
+}

pdb-plotting/src/main/java/org/lucares/recommind/logs/CsvSummary.java

@@ -1,21 +1,17 @@
 package org.lucares.recommind.logs;
 
-import java.io.File;
-
 import org.lucares.pdb.plot.api.AggregatedData;
 
 class CsvSummary {
 	private final int values;
 	private final long maxValue;
-	private final File dataFile;
 	private final AggregatedData aggregatedData;
 	private final double statsAverage;
 	private final int plottedValues;
 
-	public CsvSummary(final File dataFile, final int values, final int plottedValues, final long maxValue,
+	public CsvSummary(final int values, final int plottedValues, final long maxValue,
 			final double statsAverage, final AggregatedData aggregatedData) {
 		super();
-		this.dataFile = dataFile;
 		this.values = values;
 		this.plottedValues = plottedValues;
 		this.maxValue = maxValue;
@@ -23,9 +19,6 @@ class CsvSummary {
 		this.aggregatedData = aggregatedData;
 	}
 
-	public File getDataFile() {
-		return dataFile;
-	}
 
 	/**
 	 * Total number of values in the selected date range.

pdb-plotting/src/main/java/org/lucares/recommind/logs/DataSeries.java

@@ -43,8 +43,6 @@ public interface DataSeries {
 
 	public AggregatedData getAggregatedData();
 
-	public String getGnuplotPlotDefinition();
-
 	public static Map<String, Integer> toMap(final List<DataSeries> dataSeries) {
 		final Map<String, Integer> result = new LinkedHashMap<>();
 

pdb-plotting/src/main/java/org/lucares/recommind/logs/FileBackedDataSeries.java

@@ -1,7 +1,5 @@
 package org.lucares.recommind.logs;
 
-import java.io.File;
-
 import org.lucares.pdb.plot.api.AggregatedData;
 
 public class FileBackedDataSeries implements DataSeries {
@@ -12,16 +10,13 @@ public class FileBackedDataSeries implements DataSeries {
 
 	private final int id;
 
-	private final GnuplotLineType linetype;
-
 	private LineStyle style;
 
-	public FileBackedDataSeries(final int id, final String title, final CsvSummary csvSummary,
+	public FileBackedDataSeries(final int id, final String title, final CsvSummary csvSummary
-			final GnuplotLineType linetype) {
+			) {
 		this.id = id;
 		this.title = title;
 		this.csvSummary = csvSummary;
-		this.linetype = linetype;
 	}
 
 	@Override
@@ -44,9 +39,6 @@ public class FileBackedDataSeries implements DataSeries {
 		return style;
 	}
 
-	public File getDataFile() {
-		return csvSummary.getDataFile();
-	}
 
 	@Override
 	public String getTitle() {
@@ -77,15 +69,4 @@ public class FileBackedDataSeries implements DataSeries {
 	public AggregatedData getAggregatedData() {
 		return csvSummary.getAggregatedData();
 	}
-
-	@Override
-	public String getGnuplotPlotDefinition() {
-
-		return String.format("'%s' using 1:2 title '%s' with %s %s, \\", //
-				getDataFile(), //
-				getTitle(), //
-				linetype, // line or points
-				style//
-		);
-	}
 }

pdb-plotting/src/main/java/org/lucares/recommind/logs/GnuplotFileGenerator.java

@@ -60,6 +60,7 @@ public class GnuplotFileGenerator {
 		appendfln(result, "set grid");
 		appendfln(result, "set output \"%s\"", settings.getOutput().toAbsolutePath().toString().replace("\\", "/"));
 
+		// TODO remove marker lines?
 		// marker lines that show which area will be zoomed
 		appendfln(result, "set arrow from graph 0.25,0 rto graph 0,1 lc rgb \"#EEEEEE\" nohead");
 		appendfln(result, "set arrow from graph 0.75,0 rto graph 0,1 lc rgb \"#EEEEEE\" nohead");
@@ -103,9 +104,7 @@ public class GnuplotFileGenerator {
 		appendf(result, "plot ");
 
 		settings.getAggregate().addPlotsBeforeScatter(result, dataSeries);
-		for (final DataSeries dataSerie : dataSeries) {
+		
-			appendfln(result, dataSerie.getGnuplotPlotDefinition());
-		}
 		settings.getAggregate().addPlotsAfterScatter(result, dataSeries);
 
 		return result.toString();

pdb-plotting/src/main/java/org/lucares/recommind/logs/Plotter.java

@@ -1,11 +1,6 @@
 package org.lucares.recommind.logs;
 
-import java.io.BufferedWriter;
-import java.io.File;
-import java.io.FileOutputStream;
 import java.io.IOException;
-import java.io.OutputStreamWriter;
-import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
 import java.nio.file.LinkOption;
 import java.nio.file.Path;
@@ -14,7 +9,6 @@ import java.time.format.DateTimeFormatter;
 import java.time.temporal.ChronoUnit;
 import java.util.ArrayList;
 import java.util.Collections;
-import java.util.Formatter;
 import java.util.Iterator;
 import java.util.List;
 import java.util.UUID;
@@ -23,13 +17,11 @@ import java.util.concurrent.atomic.AtomicInteger;
 import java.util.stream.Stream;
 
 import org.lucares.collections.LongList;
-import org.lucares.collections.Sparse2DLongArray;
 import org.lucares.pdb.api.DateTimeRange;
 import org.lucares.pdb.api.GroupResult;
 import org.lucares.pdb.api.Query;
 import org.lucares.pdb.api.Result;
 import org.lucares.pdb.api.Tags;
-import org.lucares.pdb.plot.api.AxisScale;
 import org.lucares.pdb.plot.api.CustomAggregator;
 import org.lucares.pdb.plot.api.Limit;
 import org.lucares.pdb.plot.api.PlotSettings;
@@ -95,7 +87,7 @@ public class Plotter {
 
           final int id = idCounter.incrementAndGet();
           final String title = title(groupResult.getGroupedBy(), csvSummary);
-          final DataSeries dataSerie = new FileBackedDataSeries(id, title, csvSummary, GnuplotLineType.Points);
+          final DataSeries dataSerie = new FileBackedDataSeries(id, title, csvSummary);
           if (dataSerie.getValues() > 0) {
             dataSeries.add(dataSerie);
           }
@@ -202,35 +194,25 @@ public class Plotter {
   private static CsvSummary toCsvDeduplicated(final GroupResult groupResult, final Path tmpDir,
       final OffsetDateTime dateFrom, final OffsetDateTime dateTo, final PlotSettings plotSettings) throws IOException {
 
-    final File dataFile = File.createTempFile("data", ".dat", tmpDir.toFile());
     final long start = System.nanoTime();
     final Stream<LongList> timeValueStream = groupResult.asStream();
     final long fromEpochMilli = dateFrom.toInstant().toEpochMilli();
     final long toEpochMilli = dateTo.toInstant().toEpochMilli();
     final boolean useMillis = (toEpochMilli - fromEpochMilli) < TimeUnit.MINUTES.toMillis(5);
-    final long plotAreaWidthInPx = plotSettings.getWidth() - GnuplotSettings.GNUPLOT_LEFT_RIGHT_MARGIN;
-    final long plotAreaHeightInPx = plotSettings.getHeight() - GnuplotSettings.GNUPLOT_TOP_BOTTOM_MARGIN;
-    final long epochMillisPerPixel = Math.max(1, (toEpochMilli - fromEpochMilli) / plotAreaWidthInPx);
 
     final long minValue = plotSettings.getYRangeUnit() == TimeRangeUnitInternal.AUTOMATIC ? 0
         : plotSettings.getYRangeUnit().toMilliSeconds(plotSettings.getYRangeMin());
     final long maxValue = plotSettings.getYRangeUnit() == TimeRangeUnitInternal.AUTOMATIC ? Long.MAX_VALUE
         : plotSettings.getYRangeUnit().toMilliSeconds(plotSettings.getYRangeMax());
-    final long durationMillisPerPixel = plotSettings.getYAxisScale() == AxisScale.LINEAR
-        ? Math.max(1, (maxValue - minValue) / plotAreaHeightInPx)
-        : 1;
 
-    final CustomAggregator aggregator = plotSettings.getAggregate().createCustomAggregator(tmpDir, fromEpochMilli,
+    final CustomAggregator aggregator = plotSettings.getAggregate().createCustomAggregator(tmpDir, plotSettings, fromEpochMilli,
         toEpochMilli);
 
-    final Sparse2DLongArray matrix2d = new Sparse2DLongArray();
     int count = 0; // number of values in the x-axis range (used to compute stats)
     int plottedValues = 0;
     long statsMaxValue = 0;
     double statsCurrentAverage = 0.0;
     long ignoredValues = 0;
-    final int separator = ',';
-    final int newline = '\n';
 
     final Iterator<LongList> it = timeValueStream.iterator();
     while (it.hasNext()) {
@@ -246,7 +228,7 @@ public class Plotter {
 
         final long value = entry.get(i + 1);
 
-        aggregator.addValue(epochMilli, value);
+        
 
         // compute stats
         count++;
@@ -256,53 +238,25 @@ public class Plotter {
         statsCurrentAverage = statsCurrentAverage + (value - statsCurrentAverage) / count;
 
         // check if value is in the selected y-range
-        if (value < minValue || value > maxValue) {
+        boolean valueIsInYRange = value < minValue || value > maxValue;
+        if (valueIsInYRange) {
           ignoredValues++;
-          continue;
+        }else {
+          plottedValues++;
         }
         
-        final long roundedEpochMilli = epochMilli - epochMilli % epochMillisPerPixel;
+        aggregator.addValue(valueIsInYRange, epochMilli, value);
-        final long roundedValue = value - value % durationMillisPerPixel;
-        matrix2d.put(roundedEpochMilli, roundedValue, 1);
-
-        plottedValues++;
       }
     }
 
-    long[] actualValuesWritten = new long[1];
-    final StringBuilder formattedDateBuilder = new StringBuilder();
-    try (
-        final LambdaFriendlyWriter output = new LambdaFriendlyWriter(
-            new BufferedWriter(new OutputStreamWriter(new FileOutputStream(dataFile), StandardCharsets.ISO_8859_1)));
-        final Formatter formatter = new Formatter(formattedDateBuilder);) {
     
-      matrix2d.forEach((epochMilli, value, __) -> {
-
-        final String stringValue = LongUtils.longToString(value);
-        final String formattedDate;
-
-        if (useMillis) {
-          formattedDateBuilder.delete(0, formattedDateBuilder.length());
-          formatter.format("%.3f", epochMilli / 1000.0);
-          formattedDate = formattedDateBuilder.toString();
-        } else {
-          formattedDate = String.valueOf(epochMilli / 1000);
-        }
-
-        output.write(formattedDate);
-        output.write(separator);
-        output.write(stringValue);
-        output.write(newline);
-        actualValuesWritten[0]++;
-      });
-    }
 
     METRICS_LOGGER.debug(
-        "wrote {} (actual: {} factor: {}%) values to csv in: {}ms (ignored {} values) use millis: {}, grouping={}, file={}",
+        "wrote {} values to csv in: {}ms (ignored {} values) use millis: {}, grouping={}",
-        actualValuesWritten[0], count, (double) count / (actualValuesWritten[0]),
+        plottedValues,
         (System.nanoTime() - start) / 1_000_000.0, ignoredValues, Boolean.toString(useMillis),
-        groupResult.getGroupedBy().asString(), dataFile);
+        groupResult.getGroupedBy().asString());
-    return new CsvSummary(dataFile, count, plottedValues, statsMaxValue, statsCurrentAverage,
+    return new CsvSummary( count, plottedValues, statsMaxValue, statsCurrentAverage,
         aggregator.getAggregatedData());
 
   }

pdb-ui/src/main/java/org/lucares/pdbui/PlotSettingsTransformer.java

@@ -5,6 +5,7 @@ import org.lucares.pdb.plot.api.NullAggregate;
 import org.lucares.pdb.plot.api.ParallelRequestsAggregate;
 import org.lucares.pdb.plot.api.CumulativeDistributionHandler;
 import org.lucares.pdb.plot.api.PlotSettings;
+import org.lucares.pdb.plot.api.ScatterAggregateHandler;
 import org.lucares.pdb.plot.api.TimeRangeUnitInternal;
 import org.lucares.pdbui.domain.Aggregate;
 import org.lucares.pdbui.domain.PlotRequest;
@@ -61,6 +62,8 @@ class PlotSettingsTransformer {
 			return new CumulativeDistributionHandler();
 		case PARALLEL:
 			return new ParallelRequestsAggregate();
+		case SCATTER:
+		  return new ScatterAggregateHandler();
 		}
 		throw new IllegalStateException("unhandled enum: " + aggregate);
 	}

pdb-ui/src/main/java/org/lucares/pdbui/domain/Aggregate.java

@@ -1,14 +1,19 @@
 package org.lucares.pdbui.domain;
 
+/**
+ * Note: The order in this enum defines the order in which the aggregates are drawn.
+ */
 public enum Aggregate {
 	NONE,
 
+	PARALLEL,
+	
+	SCATTER,
+	
 	/**
 	 * Empirical cumulative distribution functions
 	 *
 	 * @see https://serialmentor.com/dataviz/ecdf-qq.html
 	 */
 	CUM_DISTRIBUTION,
-
-	PARALLEL
 }

pdb-ui/src/main/resources/resources/js/ui.js

@@ -784,6 +784,7 @@ Vue.component('search-bar', {
 					<option value="NONE">-</option>
 					<option value="CUM_DISTRIBUTION" title="cumulative distribution, see https://serialmentor.com/dataviz/ecdf-qq.html">cum. distribution</option>
 					<option value="PARALLEL">parallel requests</option>
+					<option value="SCATTER">scatter plot</option>
 				</select>
 			</div>
 			

pdb-ui/src/test/java/org/lucares/pdbui/CsvToEntryTransformerPerformanceTest.java

@@ -16,7 +16,8 @@ public class CsvToEntryTransformerPerformanceTest {
 
 	private static final byte NEWLINE = '\n';
 
-	public static void main(final String[] args) throws Exception {
+	@SuppressWarnings("unused")
+  public static void main(final String[] args) throws Exception {
 		// final Path csvFile =
 		// Paths.get("/home/andi/ws/performanceDb/data/production/1k.csv");
 		final Path csvFile = Paths.get("/home/andi/ws/performanceDb/data/production/logs_2018-09-05_2018-09-05.csv");
@@ -40,7 +41,8 @@ public class CsvToEntryTransformerPerformanceTest {
 		// System.out.println("summary: " + summaryStatisticsPut);
 	}
 
-	private static void runtest(final Path csvFile) throws IOException, FileNotFoundException {
+	@SuppressWarnings("unused")
+  private static void runtest(final Path csvFile) throws IOException, FileNotFoundException {
 		final byte newline = NEWLINE;
 
 		byte[] line = new byte[4096]; // max line length
@@ -92,7 +94,8 @@ public class CsvToEntryTransformerPerformanceTest {
 
 	private static void handleLine(final byte[] line, final int bytesInLine) {
 
-		final String x = new String(line, 0, bytesInLine, StandardCharsets.UTF_8);
+		@SuppressWarnings("unused")
+    final String x = new String(line, 0, bytesInLine, StandardCharsets.UTF_8);
 		// System.out.println(">" + x + "<");
 	}
 }