StreamSortBench.java

package com.github.stokito.experiments;

import static java.util.concurrent.TimeUnit.MILLISECONDS;
import static org.openjdk.jmh.annotations.Mode.Throughput;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Locale;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Level;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.State;
import org.openjdk.jmh.infra.Blackhole;

/*
Benchmark                        Mode  Cnt    Score    Error   Units
StreamSortBench.testCloneSort   thrpt    5  861.309 ± 71.133  ops/ms
StreamSortBench.testStreamSort  thrpt    5  768.630 ± 29.832  ops/ms
*/
@State(Scope.Thread)
public class StreamSortBench {
  private static final String[] COLUMNS = {
    "id",
    "merchant_id",
    "public_key",
    "registration_date",
    "reserve_fee",
    "secret_key",
    "status_acknowledged",
    "marketplace_id",
    "payout_interval_id",
    "merchant_status",
    "newsletter_subscribed",
    "logo",
    "firts_name",
    "last_name",
    "company_id",
    "wallet_account_code",
    "unavailable_message",
    "wallet_kyc_check_status"
  };

  @Setup(Level.Trial)
  public void setup() {

  }

  @Benchmark
  @BenchmarkMode(Throughput)
  @OutputTimeUnit(MILLISECONDS)
  public void testStreamSort(Blackhole bh) {
    StringBuilder sb = new StringBuilder(1024);
    Arrays.stream(COLUMNS)
      .sorted(String::compareTo)
      .forEachOrdered(columnName -> sb.append( "column`" ).append( columnName ).append( '`' ));
    bh.consume(sb.toString());
  }

  @Benchmark
  @BenchmarkMode(Throughput)
  @OutputTimeUnit(MILLISECONDS)
  public void testCloneSort(Blackhole bh) {
    StringBuilder sb = new StringBuilder(1024);
    String[] alphabeticalColumns = COLUMNS.clone();
    Arrays.sort( alphabeticalColumns, String::compareTo);
    for ( String column : alphabeticalColumns ) {
      String columnName = column;
      sb.append( "column`" ).append( columnName ).append( '`' );
    }
    bh.consume(sb.toString());
  }

}