assertSame(oldValue, segment.remove(key, hash));
    assertEquals(0, segment.count);
    assertNull(segment.get(key, hash));

    // cleared
    segment.setTableEntryForTesting(index, entry);
    segment.count++;
    assertEquals(1, segment.count);
    assertSame(oldValue, segment.get(key, hash));
    oldValueRef.clear();
    assertNull(segment.remove(key, hash));
    assertEquals(0, segment.count);

    assertSame(oldValue, segment.remove(key, hash));
    assertEquals(0, segment.count);
    assertNull(segment.get(key, hash));

    // cleared
    segment.setTableEntryForTesting(index, entry);
    segment.count++;
    assertEquals(1, segment.count);
    assertSame(oldValue, segment.get(key, hash));
    oldValueRef.clear();
    assertNull(segment.remove(key, hash));
    assertEquals(0, segment.count);

import com.google.common.cache.LocalCache.Segment;
import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * Benchmark for {@code LocalCache.Segment.removeEntryFromChain}.
 *
 * @author Charles Fry
 */
@SuppressWarnings("CheckReturnValue")
public class ChainBenchmark {

  @Param({"1", "2", "3", "4", "5", "6"})
  int length;

  private Segment<Object, Object> segment;
  private ReferenceEntry<Object, Object> head;

            .build(loader);
    runRemovalScheduler(cache, removalListener, loader, ticker, KEY_PREFIX, EXPIRING_TIME);
  }

  public void testExpirationOrder_access() {
    // test lru within a single segment
    FakeTicker ticker = new FakeTicker();
    IdentityLoader<Integer> loader = identityLoader();
    LoadingCache<Integer, Integer> cache =
        CacheBuilder.newBuilder()
            .concurrencyLevel(1)

          <offlineLinks>
            <!-- We need local copies of some of these for 2 reasons: a User-Agent problem (https://stackoverflow.com/a/47891403/28465) and an SSL problem (https://issues.apache.org/jira/browse/MJAVADOC-507). If we choose to work around the User-Agent problem, we can go back to <links>, sidestepping the SSL problem. -->

       */
      return null;
    }
  }

  /**
   * Returns the Method that can be used to resolve an individual StackTraceElement, or null if that
   * method cannot be found (it is only to be found in fairly recent JDKs).
   */
  @J2ktIncompatible
  @GwtIncompatible // java.lang.reflect
  @CheckForNull
  private static Method getGetMethod() {
    return getJlaMethod("getStackTraceElement", Throwable.class, int.class);
  }

       */
      return null;
    }
  }

  /**
   * Returns the Method that can be used to resolve an individual StackTraceElement, or null if that
   * method cannot be found (it is only to be found in fairly recent JDKs).
   */
  @J2ktIncompatible
  @GwtIncompatible // java.lang.reflect
  @CheckForNull
  private static Method getGetMethod() {
    return getJlaMethod("getStackTraceElement", Throwable.class, int.class);
  }

    if (reference == null) {
      throw new NullPointerException(lenientFormat(errorMessageTemplate, p1, p2, p3, p4));
    }
    return reference;
  }

  /*
   * All recent hotspots (as of 2009) *really* like to have the natural code
   *
   * if (guardExpression) {
   *    throw new BadException(messageExpression);
   * }
   *

    // no entry
    assertEquals(0, segment.count);
    assertNull(segment.remove(key, hash));
    assertEquals(0, segment.count);

    // same key
    table.set(index, entry);
    segment.count++;
    assertEquals(1, segment.count);
    assertSame(oldValue, segment.get(key, hash));
    assertSame(oldValue, segment.remove(key, hash));
    assertEquals(0, segment.count);
    assertNull(segment.get(key, hash));

    // no entry
    assertEquals(0, segment.count);
    assertNull(segment.remove(key, hash));
    assertEquals(0, segment.count);

    // same key
    table.set(index, entry);
    segment.count++;
    assertEquals(1, segment.count);
    assertSame(oldValue, segment.get(key, hash));
    assertSame(oldValue, segment.remove(key, hash));
    assertEquals(0, segment.count);
    assertNull(segment.get(key, hash));