add method that returns a string representation of the tags in Tags

pdb-api/src/main/java/org/lucares/pdb/api/Tags.java

@@ -225,4 +225,22 @@ public class Tags {
 		return new Tags(filename);
 	}
 
+	public String asString() {
+
+		final StringBuilder result = new StringBuilder();
+		final SortedSet<Tag> tags = toTags();
+
+		for (final Tag tag : tags) {
+			if (result.length() > 0) {
+				result.append(", ");
+			}
+
+			result.append(tag.getKey());
+			result.append(":");
+			result.append(tag.getValue());
+		}
+
+		return result.toString();
+	}
+
 }

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

@@ -37,7 +37,6 @@ public class ScatterPlot implements ConcretePlotter {
 	private static final Logger LOGGER = LoggerFactory.getLogger(ScatterPlot.class);
 	private static final Logger METRICS_LOGGER = LoggerFactory.getLogger("org.lucares.metrics.plotter.scatter");
 
-	
 	private final PerformanceDb db;
 	private final Path tmpBaseDir;
 	private final Path outputDir;
@@ -64,7 +63,6 @@ public class ScatterPlot implements ConcretePlotter {
 
 		LOGGER.trace("start plot: {}", plotSettings);
 
-
 		final String tmpSubDir = ConcretePlotter.uniqueDirectoryName();
 		final Path tmpDir = tmpBaseDir.resolve(tmpSubDir);
 		try {
@@ -88,23 +86,23 @@ public class ScatterPlot implements ConcretePlotter {
 
 					final int id = idCounter.incrementAndGet();
 					final String title = ConcretePlotter.title(groupResult.getGroupedBy(), csvSummary.getValues());
-					final DataSeries dataSerie = new FileBackedDataSeries(id, title, csvSummary, GnuplotLineType.Points);
+					final DataSeries dataSerie = new FileBackedDataSeries(id, title, csvSummary,
+							GnuplotLineType.Points);
 					if (dataSerie.getValues() > 0) {
 						dataSeries.add(dataSerie);
 					}
-				}catch (Exception e){
+				} catch (final Exception e) {
 					throw new IllegalStateException(e); // TODO handle
 				}
 			});
-			METRICS_LOGGER.debug("csv generation took: " + (System.nanoTime() - start) / 1_000_000.0
+			METRICS_LOGGER.debug("csv generation took: " + (System.nanoTime() - start) / 1_000_000.0 + "ms");
-					+ "ms");
 
 			if (dataSeries.isEmpty()) {
 				throw new NoDataPointsException();
 			}
 
 			final Limit limitBy = plotSettings.getLimitBy();
-			int limit = plotSettings.getLimit();
+			final int limit = plotSettings.getLimit();
 			DataSeries.sortAndLimit(dataSeries, limitBy, limit);
 			DataSeries.setColors(dataSeries);
 
@@ -158,12 +156,8 @@ public class ScatterPlot implements ConcretePlotter {
 		gnuplotSettings.getxAxisSettings().setTo(formattedMaxDate);
 	}
 
-	
-
-
-	
 	private static CsvSummary toCsv(final GroupResult groupResult, final Path tmpDir, final OffsetDateTime dateFrom,
-			final OffsetDateTime dateTo, PlotSettings plotSettings) throws IOException {
+			final OffsetDateTime dateTo, final PlotSettings plotSettings) throws IOException {
 
 		final File dataFile = File.createTempFile("data", ".dat", tmpDir.toFile());
 		final long start = System.nanoTime();
@@ -179,17 +173,18 @@ public class ScatterPlot implements ConcretePlotter {
 		final int separator = ',';
 		final int newline = '\n';
 		final StringBuilder formattedDateBuilder = new StringBuilder();
-		try (final Writer output = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(dataFile), StandardCharsets.US_ASCII));
+		try (final Writer output = new BufferedWriter(
+				new OutputStreamWriter(new FileOutputStream(dataFile), StandardCharsets.US_ASCII));
 				final Formatter formatter = new Formatter(formattedDateBuilder);) {
 
 			final Iterator<Entry> it = entries.iterator();
 			while (it.hasNext()) {
 				final Entry entry = it.next();
 
-				long epochMilli = entry.getEpochMilli();
+				final long epochMilli = entry.getEpochMilli();
 				if (fromEpochMilli <= epochMilli && epochMilli <= toEpochMilli) {
 
-					long value = entry.getValue();
+					final long value = entry.getValue();
 					final String stringValue = LongUtils.longToString(value);
 					final String formattedDate;
 
@@ -216,7 +211,9 @@ public class ScatterPlot implements ConcretePlotter {
 			}
 		}
 
-		METRICS_LOGGER.debug("wrote {} values to csv in: {}ms (ignored {} values) use millis: {}, grouping={}, file={}", count, (System.nanoTime() - start) / 1_000_000.0, ignoredValues, Boolean.toString(useMillis), groupResult.getGroupedBy(),dataFile);
+		METRICS_LOGGER.debug("wrote {} values to csv in: {}ms (ignored {} values) use millis: {}, grouping={}, file={}",
+				count, (System.nanoTime() - start) / 1_000_000.0, ignoredValues, Boolean.toString(useMillis),
+				groupResult.getGroupedBy().asString(), dataFile);
 		return new CsvSummary(dataFile, count, maxValue, aggregator.getAggregatedData());
 	}