}
      };

  private CacheBuilderFactory factoryWithAllKeyStrengths() {
    return new CacheBuilderFactory()
        .withKeyStrengths(ImmutableSet.of(STRONG, Strength.WEAK))
        .withValueStrengths(ImmutableSet.of(STRONG, Strength.WEAK, Strength.SOFT));
  }

  private Iterable<LoadingCache<Key, String>> caches() {
    CacheBuilderFactory factory = factoryWithAllKeyStrengths();
    return Iterables.transform(

    assertThrows(NoSuchElementException.class, iter::next);
    assertThrows(NoSuchElementException.class, iter::peek);
  }


  @J2ktIncompatible // weak references, details of GC
  @GwtIncompatible // weak references
  @AndroidIncompatible // depends on details of GC
  public void testFreesNextReference() {
    Iterator<Object> itr =
        new AbstractIterator<Object>() {
          @Override

    // This is trickier than expected. We plan to put 15 values in each of these (WARMUP_MIN to
    // WARMUP_MAX), but the tests assume no values get evicted. Even with a maximumSize of 100, one
    // of the values gets evicted. With weak keys, we use identity equality, which means using
    // System.identityHashCode, which means the assignment of keys to segments is nondeterministic,

            }
        }

        // Clean up expired weak references
        cleanupExpiredReferences();

        // Release all leases
        releaseAll();

        // Clear file cache
        fileCache.clear();
    }

    /**
     * Clean up expired weak references from the file cache
     */
    private void cleanupExpiredReferences() {
        try {

      /*
       * Using weak references here could let us release exceptions earlier, but:
       *
       * 1. On Android, querying a WeakReference blocks if the GC is doing an otherwise-concurrent
       * pass.
       *
       * 2. We would probably choose to compare exceptions using == instead of equals() (for
       * consistency with how weak references are cleared). That's a behavior change -- arguably the

#else
#define TF_CAPI_EXPORT __declspec(dllimport)
#endif  // TF_COMPILE_LIBRARY
#else
#ifdef TF_CAPI_WEAK
#define TF_CAPI_EXPORT \
  __attribute__((visibility("default"))) __attribute((weak))
#else
#define TF_CAPI_EXPORT __attribute__((visibility("default")))
#endif  // TF_CAPI_WEAK
#endif  // _WIN32
#endif  // SWIG

// TF_Bool is the C API typedef for unsigned char, while TF_BOOL is

    checkStrength(map, Strength.WEAK, Strength.STRONG);
    assertThat(map.entryHelper)
        .isInstanceOf(MapMakerInternalMap.WeakKeyStrongValueEntry.Helper.class);
  }

  public void testSetWeakValues() {
    MapMakerInternalMap<Object, Object, ?, ?> map = makeMap(createMapMaker().weakValues());
    checkStrength(map, Strength.STRONG, Strength.WEAK);
    assertThat(map.entryHelper)

    checkStrength(map, Strength.WEAK, Strength.STRONG);
    assertThat(map.entryHelper)
        .isInstanceOf(MapMakerInternalMap.WeakKeyStrongValueEntry.Helper.class);
  }

  public void testSetWeakValues() {
    MapMakerInternalMap<Object, Object, ?, ?> map = makeMap(createMapMaker().weakValues());
    checkStrength(map, Strength.STRONG, Strength.WEAK);
    assertThat(map.entryHelper)

    // This is trickier than expected. We plan to put 15 values in each of these (WARMUP_MIN to
    // WARMUP_MAX), but the tests assume no values get evicted. Even with a maximumSize of 100, one
    // of the values gets evicted. With weak keys, we use identity equality, which means using
    // System.identityHashCode, which means the assignment of keys to segments is nondeterministic,

import com.google.common.primitives.Primitives;
import com.google.common.reflect.TypeToken;
import com.google.common.util.concurrent.UncheckedExecutionException;
import com.google.j2objc.annotations.Weak;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;