1 files changed, 79 insertions, 0 deletions
diff --git a/src/main/java/dev/morling/onebrc/CalculateAverage_kuduwa.java b/src/main/java/dev/morling/onebrc/CalculateAverage_kuduwa.java
new file mode 100644
index 0000000..98a3ada
--- /dev/null
+++ b/src/main/java/dev/morling/onebrc/CalculateAverage_kuduwa.java
@@ -0,0 +1,79 @@
+/*
+ *  Copyright 2023 The original authors
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package dev.morling.onebrc;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.stream.Collectors;
+
+public class CalculateAverage_kuduwa {
+
+    private static final String FILE = "./measurements.txt";
+
+  private record Measurement(double min, double max, double sum, long count) {
+
+    Measurement(double initialMeasurement) {
+      this(initialMeasurement, initialMeasurement, initialMeasurement, 1);
+    }
+
+    public static Measurement combineWith(Measurement m1, Measurement m2) {
+      return new Measurement(
+          m1.min < m2.min ? m1.min : m2.min,
+          m1.max > m2.max ? m1.max : m2.max,
+          m1.sum + m2.sum,
+          m1.count + m2.count);
+    }
+
+    public String toString() {
+      return round(min) + "/" + round(sum / count) + "/" + round(max);
+    }
+
+    private double round(double value) {
+      return Math.round(value * 10.0) / 10.0;
+    }
+  }
+
+    public static void main(String[] args) throws IOException {
+        // long before = System.currentTimeMillis();
+        Map<String, Measurement> resultMap = new ConcurrentHashMap<>();
+        Files.lines(Path.of(FILE))
+                .parallel()
+                .forEach(
+                        line -> {
+                            int pivot = line.indexOf(";");
+                            String key = line.substring(0, pivot);
+                            Measurement measured = new Measurement(Double.parseDouble(line.substring(pivot + 1)));
+                            Measurement existingMeasurement = resultMap.get(key);
+                            if (existingMeasurement != null) {
+                                resultMap.put(key, Measurement.combineWith(existingMeasurement, measured));
+                            }
+                            else {
+                                resultMap.put(key, measured);
+                            }
+                        });
+        System.out.print("{");
+        System.out.print(
+                resultMap.entrySet().stream()
+                        .map(Object::toString)
+                        .sorted()
+                        .collect(Collectors.joining(", ")));
+        System.out.println("}");
+        // System.out.println("Took: " + (System.currentTimeMillis() - before));
+    }
+}