DefaultAttributeMapBenchmark Class — netty Architecture

Source Code

microbench/src/main/java/io/netty/util/DefaultAttributeMapBenchmark.java lines 32–135

@Warmup(iterations = 5, time = 1)
@Measurement(iterations = 5, time = 1)
@State(Scope.Benchmark)
public class DefaultAttributeMapBenchmark extends AbstractMicrobenchmark {

    @Param({ "8", "32", "128" })
    private int keyCount;
    private AttributeKey<Integer>[] keys;
    private IdentityHashMap<AttributeKey<Integer>, Attribute<Integer>> identityHashMap;
    private DefaultAttributeMap attributes;

    @State(Scope.Thread)
    public static class KeySequence {

        long nextKey;

        @Setup(Level.Iteration)
        public void reset() {
            nextKey = 0;
        }

        public long next() {
            return nextKey++;
        }
    }

    @Setup
    public void init() {
        if (Integer.bitCount(keyCount) != 1) {
            throw new AssertionError("keyCount should cbe a power of 2");
        }
        attributes = new DefaultAttributeMap();
        keys = new AttributeKey[keyCount];
        identityHashMap = new IdentityHashMap<AttributeKey<Integer>, Attribute<Integer>>(keyCount);
        for (int i = 0; i < keyCount; i++) {
            final AttributeKey<Integer> key = AttributeKey.valueOf(Integer.toString(i));
            keys[i] = key;
            final Attribute<Integer> attribute = attributes.attr(key);
            identityHashMap.put(key, attribute);
        }
    }

    @Benchmark
    @Threads(3)
    public Attribute<Integer> nextAttributeIdentityHashMap(KeySequence sequence) {
        long next = sequence.next();
        AttributeKey<Integer>[] keys = this.keys;
        AttributeKey<Integer> key = keys[(int) (next & keys.length - 1)];
        return identityHashMap.get(key);
    }

    @Benchmark
    @Threads(3)
    public boolean hasAttributeIdentityHashMap(KeySequence sequence) {
        long next = sequence.next();
        AttributeKey<Integer>[] keys = this.keys;
        AttributeKey<Integer> key = keys[(int) (next & keys.length - 1)];
        return identityHashMap.containsKey(key);
    }

    @Benchmark
    @Threads(3)
    public void mixedAttributeIdentityHashMap(KeySequence sequence, Blackhole hole) {
        long next = sequence.next();
        AttributeKey<Integer>[] keys = this.keys;
        AttributeKey<Integer> key = keys[(int) (next & keys.length - 1)];
        if (next % 2 == 0) {
            hole.consume(identityHashMap.get(key));
        } else {
            hole.consume(identityHashMap.containsKey(key));
        }
    }

    @Benchmark
    @Threads(3)
    public Attribute<Integer> nextAttributeAttributeMap(KeySequence sequence) {
        long next = sequence.next();
        AttributeKey<Integer>[] keys = this.keys;
        AttributeKey<Integer> key = keys[(int) (next & keys.length - 1)];
        return attributes.attr(key);
    }