HttpMethodMapBenchmark Class — netty Architecture

Source Code

microbench/src/main/java/io/netty/handler/codec/http/HttpMethodMapBenchmark.java lines 42–207

@State(Scope.Benchmark)
@Warmup(iterations = 5)
@Measurement(iterations = 8)
@OutputTimeUnit(TimeUnit.MICROSECONDS)
public class HttpMethodMapBenchmark extends AbstractMicrobenchmark {
    private static final Map<String, HttpMethod> OLD_MAP = new HashMap<String, HttpMethod>();
    private static final SimpleStringMap<HttpMethod> NEW_MAP;
    private static final String[] KNOWN_METHODS;
    private static final String[] MIXED_METHODS;
    private static final String[] UNKNOWN_METHODS;

    static {
        // We intentionally don't use HttpMethod.toString() here to avoid the equals(..) comparison method from being
        // able to short circuit due to reference equality checks and being biased toward the new approach. This
        // simulates the behavior of HttpObjectDecoder which will build new String objects during the decode operation.
        KNOWN_METHODS = new String[] {
                "OPTIONS",
                "GET",
                "HEAD",
                "POST",
                "PUT",
                "PATCH",
                "DELETE",
                "TRACE",
                "CONNECT"
        };
        MIXED_METHODS = new String[] {
                "OPTIONS",
                "FAKEMETHOD",
                "GET",
                "HEAD",
                "POST",
                "UBERGET",
                "PUT",
                "PATCH",
                "MYMETHOD",
                "DELETE",
                "TRACE",
                "CONNECT",
                "WHATMETHOD"
        };
        UNKNOWN_METHODS = new String[] {
                "FAKEMETHOD",
                "UBERGET",
                "MYMETHOD",
                "TESTING",
                "WHATMETHOD",
                "UNKNOWN",
                "FOOBAR"
        };
        OLD_MAP.put(OPTIONS.toString(), OPTIONS);
        OLD_MAP.put(GET.toString(), GET);
        OLD_MAP.put(HEAD.toString(), HEAD);
        OLD_MAP.put(POST.toString(), POST);
        OLD_MAP.put(PUT.toString(), PUT);
        OLD_MAP.put(PATCH.toString(), PATCH);
        OLD_MAP.put(DELETE.toString(), DELETE);
        OLD_MAP.put(TRACE.toString(), TRACE);
        OLD_MAP.put(CONNECT.toString(), CONNECT);

        NEW_MAP = new SimpleStringMap<HttpMethod>(
                new SimpleStringMap.Node<HttpMethod>(OPTIONS.toString(), OPTIONS),
                new SimpleStringMap.Node<HttpMethod>(GET.toString(), GET),
                new SimpleStringMap.Node<HttpMethod>(HEAD.toString(), HEAD),
                new SimpleStringMap.Node<HttpMethod>(POST.toString(), POST),
                new SimpleStringMap.Node<HttpMethod>(PUT.toString(), PUT),
                new SimpleStringMap.Node<HttpMethod>(PATCH.toString(), PATCH),
                new SimpleStringMap.Node<HttpMethod>(DELETE.toString(), DELETE),
                new SimpleStringMap.Node<HttpMethod>(TRACE.toString(), TRACE),
                new SimpleStringMap.Node<HttpMethod>(CONNECT.toString(), CONNECT));
    }

    private static final class SimpleStringMap<T> {
        private final SimpleStringMap.Node<T>[] values;
        private final int valuesMask;

        SimpleStringMap(SimpleStringMap.Node<T>... nodes) {
            values = (SimpleStringMap.Node<T>[]) new SimpleStringMap.Node[findNextPositivePowerOfTwo(nodes.length)];
            valuesMask = values.length - 1;
            for (SimpleStringMap.Node<T> node : nodes) {
                int i = hashCode(node.key) & valuesMask;