package com.google.common.hash;

import com.google.common.base.Supplier;
import java.util.concurrent.atomic.AtomicLong;

/**
 * Source of {@link LongAddable} objects that deals with GWT, Unsafe, and all that.
 *
 * @author Louis Wasserman
 */
final class LongAddables {
  private static final Supplier<LongAddable> SUPPLIER;

  static {
    Supplier<LongAddable> supplier;
    try {

     */
    public static class StreamOf<T> {

        private final Supplier<Stream<T>> supplier;

        /**
         * Constructs a new {@link StreamOf} instance with the given supplier.
         *
         * @param supplier the supplier of the stream
         */
        public StreamOf(final Supplier<Stream<T>> supplier) {
            this.supplier = supplier;
        }

        /**

     *
     * @param key the key for which to retrieve the session data, must not be {@code null}
     * @param supplier the supplier will compute the new value
     * @return the session data associated with the key
     */
    @Nullable
    <T> T computeIfAbsent(@Nonnull Key<T> key, @Nonnull Supplier<T> supplier);

    /**
     * Create a key using the given class as an identifier and as the type of the object.
     */

      Supplier<T> supplier) {
    return new SupplierFunction<>(supplier);
  }

  /**
   * @see Functions#forSupplier
   */
  private static final class SupplierFunction<
          F extends @Nullable Object, T extends @Nullable Object>
      implements Function<F, T>, Serializable {

    private final Supplier<T> supplier;

    private SupplierFunction(Supplier<T> supplier) {

  /**
   * Returns a cache loader based on an <i>existing</i> supplier instance. Note that there's no need
   * to create a <i>new</i> supplier just to pass it in here; just subclass {@code CacheLoader} and
   * implement {@link #load load} instead.
   *
   * <p>The returned object is serializable if {@code supplier} is serializable.
   *
   * @param supplier the supplier to be used for loading values; must never return {@code null}

    static Stream<Arguments> implementations() {
        return Stream.of(Arguments.of("returns self", (Supplier<SmbRenewableCredentials>) SelfRenewingCreds::new, true, false),
                Arguments.of("returns new", (Supplier<SmbRenewableCredentials>) NewRenewingCreds::new, false, true),
                Arguments.of("returns null", (Supplier<SmbRenewableCredentials>) NullRenewingCreds::new, false, false));
    }

        @SuppressWarnings("unchecked")
        Supplier<String> supplier = mock(Supplier.class);
        when(supplier.get()).thenThrow(new RuntimeException(new SmbUnsupportedOperationException("boom")));

        // Act & Assert: the exception is propagated and interaction recorded once
        RuntimeException thrown = assertThrows(RuntimeException.class, supplier::get);

        Striped.semaphore(256, 1));
  }

  private static final Supplier<ReadWriteLock> READ_WRITE_LOCK_SUPPLIER =
      new Supplier<ReadWriteLock>() {
        @Override
        public ReadWriteLock get() {
          return new ReentrantReadWriteLock();
        }
      };

  private static final Supplier<Lock> LOCK_SUPPLER =
      new Supplier<Lock>() {
        @Override
        public Lock get() {

        Striped.semaphore(256, 1));
  }

  private static final Supplier<ReadWriteLock> READ_WRITE_LOCK_SUPPLIER =
      new Supplier<ReadWriteLock>() {
        @Override
        public ReadWriteLock get() {
          return new ReentrantReadWriteLock();
        }
      };

  private static final Supplier<Lock> LOCK_SUPPLER =
      new Supplier<Lock>() {
        @Override
        public Lock get() {

    }
  }

  public void testForSupplier() {
    Supplier<Integer> supplier = new CountingSupplier();
    Function<@Nullable Object, Integer> function = Functions.forSupplier(supplier);

    assertEquals(1, (int) function.apply(null));
    assertEquals(2, (int) function.apply("foo"));

    new EqualsTester()
        .addEqualityGroup(function, Functions.forSupplier(supplier))