Benchmark for https://github.com/apache/tomcat/pull/325#issuecomment-661279813

EtagBench.java

package com.github.stokito.experiments;

import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Param;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.State;

import java.util.StringTokenizer;

import static java.util.concurrent.TimeUnit.MILLISECONDS;
import static org.openjdk.jmh.annotations.Mode.Throughput;

/**
 * To run the benchmark:
 * java -jar target/benchmarks.jar -wi 1 -wf 1 -tu ms -i 1 -f 1 -foe true -gc true EtagBench
 * Results:
 * Benchmark                                          (headerValue)   Mode  Cnt       Score   Error   Units
 * EtagBench.testParseOld                    W/"1047-1578315296666"  thrpt        36099.731          ops/ms
 * EtagBench.testParseOld     "AnotherEtag", W/"1047-1578315296666"  thrpt         8522.215          ops/ms
 * EtagBench.testParseOld       "AnotherEtag", "1047-1578315296666"  thrpt        11069.839          ops/ms
 * EtagBench.testParseSimple                 W/"1047-1578315296666"  thrpt       108970.307          ops/ms
 * EtagBench.testParseSimple  "AnotherEtag", W/"1047-1578315296666"  thrpt        95318.920          ops/ms
 * EtagBench.testParseSimple    "AnotherEtag", "1047-1578315296666"  thrpt       108959.153          ops/ms
 */
@State(Scope.Thread)
public class EtagBench {
    private String eTag = "\"1047-1578315296666\"";

    @Param({
            "W/\"1047-1578315296666\"",
            "\"AnotherEtag\", W/\"1047-1578315296666\"",
            "\"AnotherEtag\", \"1047-1578315296666\""
    })
    private String headerValue;

    @Benchmark
    @BenchmarkMode(Throughput)
    @OutputTimeUnit(MILLISECONDS)
    public boolean testParseOld() {
        boolean conditionSatisfied = false;
        StringTokenizer commaTokenizer =
                new StringTokenizer(headerValue, ",");

        while (!conditionSatisfied && commaTokenizer.hasMoreTokens()) {
            String currentToken = commaTokenizer.nextToken();
            currentToken = currentToken.trim();
            if (currentToken.startsWith("W/")) {
                currentToken = currentToken.substring(2);
            }
            if (currentToken.equals(eTag))
                conditionSatisfied = true;
        }
        return conditionSatisfied;
    }

    @Benchmark
    @BenchmarkMode(Throughput)
    @OutputTimeUnit(MILLISECONDS)
    public boolean testParseSimple() {
        boolean conditionSatisfied = headerValue.contains(eTag);
        return conditionSatisfied;
    }
}