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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.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.Map;
import java.util.Queue;
import java.util.TreeMap;
import java.util.stream.Collectors;
public class CalculateAverage_jgrateron {
private static final String FILE = "./measurements.txt";
private static int MAX_LINES = 100000;
public static void main(String[] args) throws IOException, InterruptedException {
// long startTime = System.nanoTime();
var tasks = new ArrayList<TaskCalcular>();
try (var reader = new BufferedReader(new FileReader(FILE))) {
String line;
var listaLineas = new LinkedList<String>();
while ((line = reader.readLine()) != null) {
listaLineas.add(line);
if (listaLineas.size() > MAX_LINES) {
var taskCalcular = new TaskCalcular(listaLineas);
listaLineas = new LinkedList<String>();
tasks.add(taskCalcular);
}
}
if (listaLineas.size() > 0) {
var taskCalcular = new TaskCalcular(listaLineas);
tasks.add(taskCalcular);
}
}
// combinar todas las particiones
var totalMediciones = new TreeMap<String, Medicion>();
for (var task : tasks) {
task.join();
var mediciones = task.getMediciones();
for (var entry : mediciones.entrySet()) {
var medicion = totalMediciones.get(entry.getKey());
if (medicion == null) {
totalMediciones.put(entry.getKey(), entry.getValue());
}
else {
var otraMed = entry.getValue();
medicion.update(otraMed.count, otraMed.tempMin, otraMed.tempMax, otraMed.tempSum);
}
}
}
var result = totalMediciones.entrySet().stream()//
.map(e -> e.getKey() + "=" + e.getValue())//
.collect(Collectors.joining(", "));
System.out.println("{" + result + "}");
// System.out.println("Total: " + (System.nanoTime() - startTime) / 1000000);
}
/*
*
*/
static class TaskCalcular {
private Queue<String> listaLineas;
private Map<String, Medicion> mediciones;
private Thread hilo;
public TaskCalcular(Queue<String> listaLineas) {
this.listaLineas = listaLineas;
mediciones = new HashMap<String, Medicion>();
hilo = Thread.ofPlatform().unstarted(() -> {
run();
});
hilo.start();
}
public void join() throws InterruptedException {
hilo.join();
}
public void run() {
String linea;
int pos;
while ((linea = listaLineas.poll()) != null) {
pos = linea.indexOf(";");
var estacion = linea.substring(0, pos);
var temp = Double.parseDouble(linea.substring(pos + 1));
var medicion = mediciones.get(estacion);
if (medicion == null) {
medicion = new Medicion(estacion, 1, temp, temp, temp);
mediciones.put(estacion, medicion);
}
else {
medicion.update(1, temp, temp, temp);
}
}
}
public Map<String, Medicion> getMediciones() {
return mediciones;
}
}
/*
*
*/
static class Medicion implements Comparable<Medicion> {
private String estacion;
private int count;
private double tempMin;
private double tempMax;
private double tempSum;
public Medicion(String estacion, int count, double tempMin, double tempMax, double tempSum) {
super();
this.estacion = estacion;
this.count = count;
this.tempMin = tempMin;
this.tempMax = tempMax;
this.tempSum = tempSum;
}
public void update(int count, double tempMin, double tempMax, double tempSum) {
this.count += count;
if (tempMin < this.tempMin) {
this.tempMin = tempMin;
}
if (tempMax > this.tempMax) {
this.tempMax = tempMax;
}
this.tempSum += tempSum;
}
@Override
public String toString() {
double tempPro = tempSum / count;
return "%.1f/%.1f/%.1f".formatted(tempMin, tempPro, tempMax);
}
@Override
public int compareTo(Medicion medicion) {
return estacion.compareTo(medicion.estacion);
}
}
}
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