func (s *Singleton[T]) GetNonBlocking() *T {
	select {
	case <-s.set:
		return s.v
	default:
		return nil
	}
}

// IsSet will return whether the singleton has been set.
func (s *Singleton[T]) IsSet() bool {
	select {
	case <-s.set:
		return true
	default:
		return false
	}
}

// Set the value and unblock all Get requests.

  }

  public void testAsSet_present() {
    Set<String> expected = Collections.singleton("a");
    assertEquals(expected, Optional.of("a").asSet());
  }

  public void testAsSet_absent() {
    assertTrue("Returned set should be empty", Optional.absent().asSet().isEmpty());
  }

  public void testAsSet_presentIsImmutable() {
    Set<String> presentAsSet = Optional.of("a").asSet();

	if err != nil || c == nil {
		return
	}
	t, s := c.Type, c.Encoded
	if !c.Type.IsSet() {
		return
	}
	if c.Type.Is(ChecksumTrailing) {
		val := r.Trailer.Get(t.Key())
		if val != "" {
			w.Header().Set(t.Key(), val)
		}
		return
	}
	w.Header().Set(t.Key(), s)
}

// AddChecksumHeader will transfer any checksum value that has been checked.

#!/bin/bash -e
#

set -E
set -o pipefail

if [ ! -x "$PWD/minio" ]; then
	echo "minio executable binary not found in current directory"
	exit 1
fi

WORK_DIR="$PWD/.verify-$RANDOM"
MINIO_CONFIG_DIR="$WORK_DIR/.minio"
MINIO=("$PWD/minio" --config-dir "$MINIO_CONFIG_DIR" server)

function start_minio_3_node() {
	export MINIO_ROOT_USER=minio
	export MINIO_ROOT_PASSWORD=minio123
	export MINIO_ERASURE_SET_DRIVE_COUNT=6

// when bucketSSEConfig is empty.
type ApplyOptions struct {
	AutoEncrypt bool
}

// Apply applies the SSE bucket configuration on the given HTTP headers and
// sets the specified SSE headers.
//
// Apply does not overwrite any existing SSE headers. Further, it will
// set minimal SSE-KMS headers if autoEncrypt is true and the BucketSSEConfig
// is nil.

        supplier.get(), "use Optional.orNull() instead of a Supplier that returns null");
  }

  @Override
  public @Nullable T orNull() {
    return null;
  }

  @Override
  public Set<T> asSet() {
    return Collections.emptySet();
  }

  @Override
  public <V> Optional<V> transform(Function<? super T, V> function) {
    checkNotNull(function);
    return Optional.absent();
  }

  @Override

		if got != test.Expected {
			t.Errorf("SSE-S3: Test %d: Wanted %v but got %v", i, test.Expected, got)
		}
	}
	for i, test := range ssecIsRequestedTests {
		_, got := IsRequested(test.Header)
		if Requested(test.Header) != got {
			// Test if result matches.
			t.Errorf("Requested mismatch, want %v, got %v", Requested(test.Header), got)
		}
		got = got && SSEC.IsRequested(test.Header)
		if got != test.Expected {

#!/bin/bash

if [ -n "$TEST_DEBUG" ]; then
	set -x
fi

pkill minio
rm -rf /tmp/xl

if [ ! -f ./mc ]; then
	wget --quiet -O mc https://dl.minio.io/client/mc/release/linux-amd64/mc &&
		chmod +x mc
fi

export CI=true
export MINIO_COMPRESSION_ENABLE="on"
export MINIO_COMPRESSION_EXTENSIONS=".go"
export MINIO_COMPRESSION_MIME_TYPES="application/*"
export MINIO_COMPRESSION_ALLOW_ENCRYPTION="on"
export MINIO_KMS_AUTO_ENCRYPTION=on

	return xattr.LSet(path, name, data)
}

func main() {
	flag.StringVar(&path, "path", "", "path name where the attribute shall be applied")
	flag.StringVar(&name, "name", "", "attribute name or it can be a wildcard if '.' is specified")
	flag.Uint64Var(&value, "value", 0, "attribute value expects the value to be uint64")
	flag.BoolVar(&set, "set", false, "this is a set attribute operation")

	flag.Parse()

  /**
   * Returns an immutable singleton {@link Set} whose only element is the contained instance if it
   * is present; an empty immutable {@link Set} otherwise.
   *
   * <p><b>Comparison to {@code java.util.Optional}:</b> this method has no equivalent in Java 8's
   * {@code Optional} class. However, this common usage:
   *
   * {@snippet :
   * for (Foo foo : possibleFoo.asSet()) {
   *   doSomethingWith(foo);
   * }
   * }