diff options
| -rwxr-xr-x | calculate_average_fragmede.sh | 21 | ||||
| -rw-r--r-- | src/main/java/dev/morling/onebrc/CalculateAverage_fragmede.java | 109 |
2 files changed, 130 insertions, 0 deletions
diff --git a/calculate_average_fragmede.sh b/calculate_average_fragmede.sh new file mode 100755 index 0000000..2941490 --- /dev/null +++ b/calculate_average_fragmede.sh @@ -0,0 +1,21 @@ +#!/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="-Xmx16g" +time java $JAVA_OPTS --class-path target/average-1.0.0-SNAPSHOT.jar dev.morling.onebrc.CalculateAverage_fragmede measurements.txt + diff --git a/src/main/java/dev/morling/onebrc/CalculateAverage_fragmede.java b/src/main/java/dev/morling/onebrc/CalculateAverage_fragmede.java new file mode 100644 index 0000000..22599c7 --- /dev/null +++ b/src/main/java/dev/morling/onebrc/CalculateAverage_fragmede.java @@ -0,0 +1,109 @@ +/* + * 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 static java.util.stream.Collectors.*; + +import java.io.IOException; +import java.nio.file.Files; +import java.nio.file.Paths; +import java.util.Map; +import java.util.TreeMap; +import java.util.stream.Collector; + +public class CalculateAverage_fragmede { + + private static final String FILE = "./measurements.txt"; + // private static final String FILE = "./yaku.txt";// "./measurements.txt"; + + private static record Measurement(String station, int value) { + public static Measurement of(String[] parts) { + //System.out.printf("string: %s!\n", parts[1]); + boolean negative = false; + int idx = 0; + if (parts[1].charAt(0) == '-') { + negative = true; + idx = 1; + } + int digit = (parts[1].charAt(idx)-48) * 10; + int digit2 = 0; + if (parts[1].charAt(idx+1) != '.') { + // two digit temperature + digit = (digit) * 10; + //System.out.println(parts[1].charAt(idx+1)); + digit2 = (parts[1].charAt(idx+1)-48)*10; + idx++; + } + // if (parts[1].charAt(idx+2) != ".") { + // abort(); + // } + int frac = parts[1].charAt(idx+2)-48; + //System.out.printf("parts, %d:%d:%d\n", digit, digit2, frac); + int value = digit + digit2 + frac; + if (negative) { + value = -value; + } + //System.out.printf("end value: %d\n", value); + return new Measurement(parts[0], value); + } + } + + private static record ResultRow(double min, double mean, double max) { + public String toString() { + return min + "/" + round(mean) + "/" + max; + } + + private double round(double value) { + return Math.round(value * 10.0) / 10.0; + } + }; + + private static class MeasurementAggregator { + private double min = Double.POSITIVE_INFINITY; + private double max = Double.NEGATIVE_INFINITY; + private double sum; + private long count; + } + + public static void main(String[] args) throws IOException { + Collector<Measurement, MeasurementAggregator, ResultRow> collector = Collector.of( + MeasurementAggregator::new, + (a, m) -> { + a.min = Math.min(a.min, m.value); + a.max = Math.max(a.max, m.value); + a.sum += m.value; + a.count++; + }, + (agg1, agg2) -> { + var res = new MeasurementAggregator(); + res.min = Math.min(agg1.min, agg2.min); + res.max = Math.max(agg1.max, agg2.max); + res.sum = agg1.sum + agg2.sum; + res.count = agg1.count + agg2.count; + + return res; + }, + agg -> { + return new ResultRow(agg.min / 10.0, agg.sum / 10.0 / agg.count, agg.max / 10.0); + }); + + Map<String, ResultRow> measurements = new TreeMap<>(Files.lines(Paths.get(args[0])) + .map(l -> Measurement.of(l.split(";"))) + .collect(groupingBy(Measurement::station, collector))); + + System.out.println(measurements); + } +} |