1 files changed, 50 insertions, 0 deletions
diff --git a/src/main/java/dev/morling/onebrc/CalculateAverage_naive.java b/src/main/java/dev/morling/onebrc/CalculateAverage_naive.java
new file mode 100644
index 0000000..54025d9
--- /dev/null
+++ b/src/main/java/dev/morling/onebrc/CalculateAverage_naive.java
@@ -0,0 +1,50 @@
+/*
+ *  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.BufferedReader;
+import java.io.FileNotFoundException;
+import java.io.FileReader;
+import java.util.concurrent.ConcurrentSkipListMap;
+import java.util.stream.Collectors;
+
+public class CalculateAverage_naive {
+
+    record Result(double min, double max, double sum, long count) {
+    }
+
+    public static void main(String[] args) throws FileNotFoundException {
+        long start = System.currentTimeMillis();
+        var results = new BufferedReader(new FileReader("./measurements.txt"))
+                .lines()
+                .map(l -> l.split(";"))
+                .collect(Collectors.toMap(
+                        parts -> parts[0],
+                        parts -> {
+                            double temperature = Double.parseDouble(parts[1]);
+                            return new Result(temperature, temperature, temperature, 1);
+                        },
+                        (oldResult, newResult) -> {
+                            double min = Math.min(oldResult.min, newResult.min);
+                            double max = Math.max(oldResult.max, newResult.max);
+                            double sum = oldResult.sum + newResult.sum;
+                            long count = oldResult.count + newResult.count;
+                            return new Result(min, max, sum, count);
+                        }, ConcurrentSkipListMap::new));
+        System.out.println(System.currentTimeMillis() - start);
+        System.out.println(results);
+    }
+}