implementation class name: CalculateAverage_ashikur2146 Execution tim…

…e: 3 mins 32 seconds

Device Specification:

CPU: 11th Gen Intel(R) Core(TM) i5-1135G7 @2.40GHz
Core: 8
RAM: 16 GB

calculate_average_ashikur2146.sh

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+#!/bin/sh
+#
+#  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.
+#
+
+JAVA_OPTS=""
+java $JAVA_OPTS --class-path target/average-1.0.0-SNAPSHOT.jar dev.morling.onebrc.CalculateAverage_ashikur2146

prepare_ashikur2146.sh

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+#!/bin/bash
+#
+#  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.
+#
+
+# Uncomment below to use sdk
+# source "$HOME/.sdkman/bin/sdkman-init.sh"
+# sdk use java 21.0.1-graal 1>&2

src/main/java/dev/morling/onebrc/CalculateAverage_ashikur2146.java

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+/*
+ *  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.nio.file.Paths;
+import java.util.Map;
+import java.util.TreeMap;
+import java.util.stream.Collectors;
+
+public class CalculateAverage_ashikur2146 {
+    private static final String FILE_PATH = "./measurements.txt";
+
+    public static void main(String[] args) {
+        try {
+            Map<String, TemperatureStats> stationStats = processFile(FILE_PATH);
+            System.out.println(stationStats);
+
+        }
+        catch (IOException e) {
+            System.err.println("Error processing file: " + e.getMessage());
+            e.printStackTrace();
+        }
+    }
+
+    private static Map<String, TemperatureStats> processFile(String filePath) throws IOException {
+        try {
+            Path path = Paths.get(filePath);
+            return Files.lines(path).map(line -> line.split(";")).parallel().filter(parts -> parts.length == 2)
+                    .collect(Collectors.groupingByConcurrent(parts -> parts[0],
+                            Collectors.mapping(parts -> new TemperatureStats(Double.parseDouble(parts[1])),
+                                    Collectors.reducing(TemperatureStats::merge))))
+                    .entrySet().stream()
+                    .collect(Collectors.toMap(Map.Entry::getKey, entry -> entry.getValue().orElseThrow(),
+                            (e1, e2) -> e1,
+                            TreeMap::new));
+        }
+        catch (IOException e) {
+            throw new IOException("Error reading file: " + e.getMessage(), e);
+        }
+    }
+
+}
+
+record TemperatureStats(double min, double mean, double max, int count) {
+
+    public TemperatureStats(double temperature) {
+		this(temperature, temperature, temperature, 1);
+	}
+
+    public TemperatureStats merge(TemperatureStats other) {
+        double newMin = Math.min(min, other.min);
+        double newMax = Math.max(max, other.max);
+        double newMean = ((mean * count) + (other.mean * other.count)) / (count + other.count);
+        return new TemperatureStats(newMin, newMean, newMax, count + other.count);
+    }
+
+    @Override
+    public String toString() {
+        return String.format("%.1f/%.1f/%.1f", min, mean, max);
+    }
+}