private transient Object lock = new Object();

    final Supplier<T> delegate;
    final long durationNanos;
    transient volatile @Nullable T value;
    // The special value 0 means "not yet initialized".
    transient volatile long expirationNanos;

    ExpiringMemoizingSupplier(Supplier<T> delegate, long durationNanos) {
      this.delegate = delegate;
      this.durationNanos = durationNanos;
    }

@NullUnmarked
public class StopwatchBenchmark {
  @Benchmark
  long stopwatch(int reps) {
    long total = 0;
    for (int i = 0; i < reps; i++) {
      Stopwatch s = Stopwatch.createStarted();
      // here is where you would do something
      total += s.elapsed(NANOSECONDS);
    }
    return total;
  }

  @Benchmark
  long manual(int reps) {
    long total = 0;
    for (int i = 0; i < reps; i++) {

    // Won't compile: map.putInstance(Double.class, new Long(42));
  }

  public void testNull() {
    assertThrows(NullPointerException.class, () -> map.put(null, new Integer(1)));
    map.putInstance(Integer.class, null);
    assertNull(map.get(Integer.class));
    assertNull(map.getInstance(Integer.class));

    map.put(Long.class, null);
    assertNull(map.get(Long.class));
    assertNull(map.getInstance(Long.class));

      T target, Class<T> interfaceType, long timeoutDuration, TimeUnit timeoutUnit) {
    checkNotNull(target);
    checkNotNull(interfaceType);
    checkNotNull(timeoutUnit);
    return target; // ha ha
  }

  @CanIgnoreReturnValue // TODO(kak): consider removing this
  @Override
  @ParametricNullness
  public <T extends @Nullable Object> T callWithTimeout(

     *
     * @return file create time
     */
    long getCreateTime();

    /**
     * Gets the file last write time.
     *
     * @return file last write time
     */
    long getLastWriteTime();

    /**
     * Gets the file last access time.
     *
     * @return file last access time
     */
    long getLastAccessTime();

    /**
     * Gets the file size in bytes.
     *

  }

  @Test fun clientTwoFrameHelloWithPongs() {
    data.write("010348656c".decodeHex()) // Hel
    data.write("8a00".decodeHex()) // Pong
    data.write("8a00".decodeHex()) // Pong
    data.write("8a00".decodeHex()) // Pong
    data.write("8a00".decodeHex()) // Pong
    data.write("80026c6f".decodeHex()) // lo
    clientReader.processNextFrame()
    callback.assertPong(EMPTY)
    callback.assertPong(EMPTY)

   * > GeneralizedTime.
   */
  internal val time: DerAdapter<Long> =
    object : DerAdapter<Long> {
      override fun matches(header: DerHeader): Boolean = Adapters.UTC_TIME.matches(header) || Adapters.GENERALIZED_TIME.matches(header)

      override fun fromDer(reader: DerReader): Long {
        val peekHeader =
          reader.peekHeader()

     *
     * @param src the source byte array
     * @param si the starting index in the source array
     * @return the decoded long value
     */
    public static long dec_uint64be(final byte[] src, final int si) {
        long l = dec_uint32be(src, si) & 0xFFFFFFFFL;
        l <<= 32L;
        l |= dec_uint32be(src, si + 4) & 0xFFFFFFFFL;
        return l;
    }

    /**

    private String lastMethodCalled = "";
    private long lastTimeoutInMillis = -1;
    private final ExecutorService inline = newDirectExecutorService();

    void assertLastMethodCalled(String method) {
      assertEquals(method, lastMethodCalled);
    }

    void assertMethodWithTimeout(String method, long timeout, TimeUnit unit) {
      assertLastMethodCalled(method + "Timeout");

   */
  var upstream: Source?,
  /** The number of bytes consumed from [upstream]. Guarded by this. */
  var upstreamPos: Long,
  /** User-supplied additional data persisted with the source data. */
  private val metadata: ByteString,
  /** The maximum size of [buffer]. */
  val bufferMaxSize: Long,
) : Lockable {
  /** The thread that currently has access to upstream. Possibly null. Guarded by this. */