51 lines
2.1 KiB
Java
51 lines
2.1 KiB
Java
/*
|
|
* 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);
|
|
}
|
|
}
|