commit 7d485d0e8b4164e1e5ce09e6ffe30d9de8f9ae7a · treybastian.com/1brc

+14 -10

pom.xml

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         <version>1.0.0-SNAPSHOT</version>

     

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         <properties>

     

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           <java.version>21</java.version>

     

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           <maven.compiler.parameters>true</maven.compiler.parameters>

     

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           <maven.compiler.release>${java.version}</maven.compiler.release>

     

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           <maven.compiler.release>21</maven.compiler.release>

     

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           <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

     

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           <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>

     

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         </properties>

     
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               <plugin>

     

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                 <groupId>org.apache.maven.plugins</groupId>

     

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                 <artifactId>maven-compiler-plugin</artifactId>

     

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                 <version>3.8.1</version>

     

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                 <version>3.12.1</version>

     

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                 <configuration>

     

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                   <enablePreview>true</enablePreview>

     

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                   <parameters>true</parameters>

     

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                   <compilerArgs>

     

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                     <compilerArg>--enable-preview</compilerArg>

     

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                     <compilerArg>--add-modules</compilerArg>

     

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                     <compilerArg>java.base,jdk.incubator.vector</compilerArg>

     

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                   </compilerArgs>

     
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               <plugin>

     

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                 <groupId>org.apache.maven.plugins</groupId>

     

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                 <artifactId>maven-deploy-plugin</artifactId>

     

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                 <version>3.0.0-M1</version>

     

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                 <version>3.1.1</version>

     

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               </plugin>

     

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               <plugin>

     

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                 <groupId>org.apache.maven.plugins</groupId>

     

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                 <artifactId>maven-enforcer-plugin</artifactId>

     

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                 <version>3.0.0-M3</version>

     

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                 <version>3.3.0</version>

     

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               </plugin>

     

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               <plugin>

     

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                 <groupId>org.apache.maven.plugins</groupId>

     

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                 <artifactId>maven-install-plugin</artifactId>

     

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                 <version>3.0.0-M1</version>

     

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                 <version>3.1.1</version>

     

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               </plugin>

     

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               <plugin>

     

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                 <groupId>org.apache.maven.plugins</groupId>

     
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               <plugin>

     

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                 <groupId>org.apache.maven.plugins</groupId>

     

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                 <artifactId>maven-site-plugin</artifactId>

     

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                 <version>3.9.1</version>

     

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                 <version>3.12.1</version>

     

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               </plugin>

     

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               <plugin>

     

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                 <groupId>org.apache.maven.plugins</groupId>

     

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                 <artifactId>maven-surefire-plugin</artifactId>

     

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                 <version>3.0.0-M5</version>

     

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                 <version>3.2.3</version>

     

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               </plugin>

     

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               <plugin>

     

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                 <groupId>org.apache.maven.plugins</groupId>

     

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                 <artifactId>maven-wrapper-plugin</artifactId>

     

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                 <version>3.2.0</version>

     

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               </plugin>

     

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             </plugins>

     

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           </pluginManagement>

     
···

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                       <configuration>

     

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                         <rules>

     

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                           <requireJavaVersion>

     

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                             <version>[${java.version},)</version>

     

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                             <version>${maven.compiler.release}</version>

     

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                           </requireJavaVersion>

     

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                           <requirePluginVersions>

     

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                              <banLatest>true</banLatest>

+7 -12

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

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       package dev.morling.onebrc;

     

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       import java.io.BufferedWriter;

     

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       import java.io.File;

     

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       import java.io.FileOutputStream;

     

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       import java.io.OutputStreamWriter;

     

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       import java.util.Arrays;

     

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       import java.nio.file.Files;

     

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       import java.nio.file.Path;

     

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       import java.util.List;

     

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       import java.util.concurrent.ThreadLocalRandom;

     

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       public class CreateMeasurements {

     

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           private static final String FILE = "./measurements.txt";

     

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           private static final Path MEASUREMENT_FILE = Path.of("./measurements.txt");

     

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           private record WeatherStation(String id, double meanTemperature) {

     

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               double measurement() {

     
···

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               //         )

     

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               // ) TO 'output.csv' (HEADER, DELIMITER ',');

     

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               // @formatter:on

     

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               List<WeatherStation> stations = Arrays.asList(

     

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               List<WeatherStation> stations = List.of(

     

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                       new WeatherStation("Abha", 18.0),

     

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                       new WeatherStation("Abidjan", 26.0),

     

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                       new WeatherStation("Abéché", 29.4),

     
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                       new WeatherStation("Zanzibar City", 26.0),

     

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                       new WeatherStation("Zürich", 9.3));

     

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               File measurements = new File(FILE);

     

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               try (FileOutputStream fos = new FileOutputStream(measurements); BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(fos));) {

     

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               try (BufferedWriter bw = Files.newBufferedWriter(MEASUREMENT_FILE)) {

     

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                   for (int i = 0; i < size; i++) {

     

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                       if (i > 0 && i % 50_000_000 == 0) {

     

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                           System.out.println("Wrote %,d measurements in %s ms".formatted(i, System.currentTimeMillis() - start));

     

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                           System.out.printf("Wrote %,d measurements in %s ms%n", i, System.currentTimeMillis() - start);

     

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                       }

     

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                       WeatherStation station = stations.get(ThreadLocalRandom.current().nextInt(stations.size()));

     

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                       bw.write(station.id());

     

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                       bw.write(";" + station.measurement());

     

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                       bw.newLine();

     

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                   }

     

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                   bw.flush();

     

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                   System.out.println("Created file with %,d measurements in %s ms".formatted(size, System.currentTimeMillis() - start));

     

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               }

     

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               System.out.printf("Created file with %,d measurements in %s ms%n", size, System.currentTimeMillis() - start);

     

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           }

     

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       }