import (
	"io"
)

// Discard is just like io.Discard without the io.ReaderFrom compatible
// implementation which is buggy on NUMA systems, we have to use a simpler
// io.Writer implementation alone avoids also unnecessary buffer copies,
// and as such incurred latencies.
var Discard io.Writer = discard{}

// discard is /dev/null for Golang.
type discard struct{}

func (discard) Write(p []byte) (int, error) {

	"lipaw":    0x63,
	"ltg1929":  0x34,
	"ltg2007":  0x35,
	"luna1918": 0x36,
	"metelko":  0x37,
	"monoton":  0x38,
	"ndyuka":   0x39,
	"nedis":    0x3a,
	"newfound": 0x3b,
	"nicard":   0x3c,
	"njiva":    0x64,
	"nulik":    0x3d,
	"osojs":    0x65,
	"oxendict": 0x3e,
	"pahawh2":  0x3f,
	"pahawh3":  0x40,
	"pahawh4":  0x41,
	"pamaka":   0x42,
	"peano":    0x43,

		name     string
		h        slog.Handler
		skipRace bool
	}{
		{"disabled", disabledHandler{}, false},
		{"async discard", newAsyncHandler(), true},
		{"fastText discard", newFastTextHandler(io.Discard), false},
		{"Text discard", slog.NewTextHandler(io.Discard, nil), false},
		{"JSON discard", slog.NewJSONHandler(io.Discard, nil), false},
	} {
		logger := slog.New(handler.h)
		b.Run(handler.name, func(b *testing.B) {

		buf.Reset()
		l.Println(testString)
	}
}

// discard is identical to io.Discard,
// but copied here to avoid the io.Discard optimization in Logger.
type discard struct{}

func (discard) Write(p []byte) (int, error) {
	return len(p), nil
}

func BenchmarkConcurrent(b *testing.B) {
	l := New(discard{}, "prefix: ", Ldate|Ltime|Lmicroseconds|Llongfile|Lmsgprefix)
	var group sync.WaitGroup

    void setMutationValidator(MutationValidator validator);

    DependencySubstitutionsInternal copy();

    /**
     * Discard all state held by this container.
     */
    void discard();

}

// NewTestIOStreamsDiscard returns a valid IOStreams that just discards
func NewTestIOStreamsDiscard() IOStreams {
	in := &bytes.Buffer{}
	return IOStreams{
		In:     in,
		Out:    io.Discard,
		ErrOut: io.Discard,
	}

 */
public class MessageHub implements AsyncStoppable {
    private enum State {Running, Stopping, Stopped}

    private static final Discard DISCARD = new Discard();
    private final ManagedExecutor workers;
    private final String displayName;
    private final Action<? super Throwable> errorHandler;
    private final Lock lock = new ReentrantLock();

	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		Encode(io.Discard, img)
	}
}

func BenchmarkEncodeNRGBA(b *testing.B) {
	img := image.NewNRGBA(image.Rect(0, 0, 640, 480))
	if img.Opaque() {
		b.Fatal("expected image not to be opaque")
	}
	b.SetBytes(640 * 480 * 4)
	b.ReportAllocs()
	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		Encode(io.Discard, img)
	}
}

func NopCloser(r io.Reader) io.ReadCloser {
	return io.NopCloser(r)
}

// Discard is an io.Writer on which all Write calls succeed
// without doing anything.
//
// Deprecated: As of Go 1.16, this value is simply [io.Discard].

			b.SetBytes(int64(n))
			for i := 0; i < b.N; i++ {
				w := NewWriter(io.Discard, LSB, 8)
				w.Write(buf1)
				w.Close()
			}
		})
		b.Run(fmt.Sprint("1e-Reuse", e), func(b *testing.B) {
			b.SetBytes(int64(n))
			w := NewWriter(io.Discard, LSB, 8)
			for i := 0; i < b.N; i++ {
				w.Write(buf1)
				w.Close()
				w.(*Writer).Reset(io.Discard, LSB, 8)
			}
		})
	}