"sync/atomic"
)

// Inspired from Golang sync.Once but it is only marked
// initialized when the provided function returns nil.

// Init represents the structure.
type Init struct {
	done uint32
	m    sync.Mutex
}

// Do is similar to sync.Once.Do - makes one successful
// call to the function. ie, it invokes the function
// if it is not successful yet.
func (l *Init) Do(f func() error) error {

import static com.google.common.util.concurrent.MoreExecutors.directExecutor;

import com.google.common.base.Function;
import java.lang.reflect.UndeclaredThrowableException;

/**
 * Unit tests for {@link Futures#transform(ListenableFuture, Function, Executor)}.
 *
 * @author Nishant Thakkar
 */
public class FuturesTransformTest extends AbstractChainedListenableFutureTest<String> {

	echo "minio executable binary not found in current directory"
	exit 1
fi

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

function start_minio() {
	start_port=$1

	export MINIO_ROOT_USER=minio
	export MINIO_ROOT_PASSWORD=minio123
	unset MINIO_KMS_AUTO_ENCRYPTION # do not auto-encrypt objects
	unset MINIO_CI_CD
	unset CI

	args=()

import kotlin.annotation.AnnotationRetention.BINARY
import kotlin.annotation.AnnotationTarget.CLASS
import kotlin.annotation.AnnotationTarget.CONSTRUCTOR
import kotlin.annotation.AnnotationTarget.FUNCTION

@Retention(BINARY)
@Documented
@Target(CONSTRUCTOR, CLASS, FUNCTION)

 *     the same lambda function as passed into {@link #using(Function)}.
 *     <p>This class is scheduled to be removed in October 2019.
 */
// TODO(b/68134636): Remove by 2019-10
@Deprecated
@Beta
@GwtCompatible
@ElementTypesAreNonnullByDefault
public abstract class TreeTraverser<T> {

  /**
   * Returns a tree traverser that uses the given function to navigate from a node to its children.

      Collection<F> fromCollection, Function<? super F, T> function) {
    return new TransformedCollection<>(fromCollection, function);
  }

  static class TransformedCollection<F extends @Nullable Object, T extends @Nullable Object>
      extends AbstractCollection<T> {
    final Collection<F> fromCollection;
    final Function<? super F, ? extends T> function;

   * #set(Object)}.
   */
  private static final class CatchingFuture<V extends @Nullable Object, X extends Throwable>
      extends AbstractCatchingFuture<V, X, Function<? super X, ? extends V>, V> {
    CatchingFuture(
        ListenableFuture<? extends V> input,
        Class<X> exceptionType,
        Function<? super X, ? extends V> fallback) {

sequenceDiagram

participant code as Code
participant function as say_hi()
participant execute as Execute function

    rect rgba(0, 255, 0, .1)
        code ->> function: say_hi(name="Camila")
        function ->> execute: 执行函数代码
        execute ->> code: 返回结果
    end

    rect rgba(0, 255, 255, .1)
        code ->> function: say_hi(name="Camila")
        function ->> code: 返回存储的结果
    end

      }
    }
  }

  /**
   * Returns a function that delegates to the {@link Interner#intern} method of the given interner.
   *
   * @since 8.0
   */
  public static <E> Function<E, E> asFunction(Interner<E> interner) {
    return new InternerFunction<>(checkNotNull(interner));
  }

  private static class InternerFunction<E> implements Function<E, E> {

    private final Interner<E> interner;

        </ul>
        <script>
        var ws = null;
            function connect(event) {
                var itemId = document.getElementById("itemId")
                var token = document.getElementById("token")
                ws = new WebSocket("ws://localhost:8000/items/" + itemId.value + "/ws?token=" + token.value);
                ws.onmessage = function(event) {
                    var messages = document.getElementById('messages')