AppendableCharSequenceBenchmark Class — netty Architecture

Source Code

microbench/src/main/java/io/netty/microbenchmark/common/AppendableCharSequenceBenchmark.java lines 29–87

@Threads(1)
@Warmup(iterations = 5)
@Measurement(iterations = 5)
public class AppendableCharSequenceBenchmark extends AbstractMicrobenchmark {
    @Param({ "32", "64", "128", "256" })
    private int charsInitSize;

    @Param({ "10", "100", "10000", "1000000" })
    private int simulatedDataSize;

    private static final Random rand = new Random();
    private char[] chars;
    private char simulatedData;
    private int pos;

    @Setup(Level.Trial)
    public void setup() {
        chars = new char[charsInitSize];
        simulatedData = (char) rand.nextInt();
    }

    @Benchmark
    public void appendCheckBeforeCopy() {
        checkReset();
        if (pos == chars.length) {
            expand();
        }
        chars[pos++] = simulatedData;
    }

    @Benchmark
    public void appendCatchExceptionAfter() {
        checkReset();
        try {
            chars[pos++] = simulatedData;
        } catch (IndexOutOfBoundsException e) {
            expand();
            chars[pos - 1] = simulatedData;
        }
    }

    private void checkReset() {
        if (pos == simulatedDataSize) {
            pos = 0;
            chars = new char[charsInitSize];
        }
    }

    private void expand() {
        char[] old = chars;
        // double it
        int len = old.length << 1;
        if (len < 0) {
            throw new IllegalStateException();
        }
        chars = new char[len];
        System.arraycopy(old, 0, chars, 0, old.length);
    }
}