Created
February 4, 2021 03:35
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package com.company; | |
import java.util.ArrayList; | |
import java.util.List; | |
import java.util.Random; | |
import java.util.concurrent.CompletableFuture; | |
import java.util.concurrent.ExecutionException; | |
public class GetVokal { | |
public static void main(String[] args) { | |
try { | |
System.out.println(handleRequest()); | |
} catch (ExecutionException e) { | |
e.printStackTrace(); | |
} catch (InterruptedException e) { | |
e.printStackTrace(); | |
} | |
} | |
private static String handleRequest() throws ExecutionException, InterruptedException { | |
List<CompletableFuture<Integer>> parallel = new ArrayList<>(); | |
parallel.add(processParallelStep(1)); | |
parallel.add(processParallelStep(2)); | |
parallel.add(processParallelStep(3)); | |
parallel.add(processParallelStep(4)); | |
var future = CompletableFuture.allOf(parallel.toArray(new CompletableFuture[0])) | |
.thenApply(result -> { | |
processSequentialStep(5); | |
processSequentialStep(6); | |
return processSequentialStep(7); | |
}); | |
return String.valueOf(future.get()); | |
} | |
private static CompletableFuture<Integer> processParallelStep(int stepNumber) { | |
return CompletableFuture.supplyAsync(() -> { | |
Random random = new Random(); | |
try { | |
Thread.sleep(100 + random.nextInt(1000)); | |
} catch (InterruptedException e) { | |
e.printStackTrace(); | |
} | |
System.out.printf("Step %d completed!%n", stepNumber); | |
return stepNumber; | |
}); | |
} | |
private static int processSequentialStep(int stepNumber) { | |
System.out.printf("Step %d completed!%n", stepNumber); | |
return stepNumber; | |
} | |
} |
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