segment.recordRead(entry, ticker.read());
    segment.expireEntries(ticker.read());
    assertSame(value, map.get(key));
    assertSame(entry, segment.writeQueue.peek());
    assertEquals(1, segment.writeQueue.size());

    ticker.advance(1);
    segment.recordRead(entry, ticker.read());
    segment.expireEntries(ticker.read());
    assertSame(value, map.get(key));

    segment.recordRead(entry, ticker.read());
    segment.expireEntries(ticker.read());
    assertSame(value, map.get(key));
    assertSame(entry, segment.writeQueue.peek());
    assertEquals(1, segment.writeQueue.size());

    ticker.advance(1);
    segment.recordRead(entry, ticker.read());
    segment.expireEntries(ticker.read());
    assertSame(value, map.get(key));

    void tryExpireEntries(long now) {
      if (tryLock()) {
        try {
          expireEntries(now);
        } finally {
          unlock();
          // don't call postWriteCleanup as we're in a read
        }
      }
    }

    @GuardedBy("this")
    void expireEntries(long now) {
      drainRecencyQueue();

      ReferenceEntry<K, V> e;

    void tryExpireEntries(long now) {
      if (tryLock()) {
        try {
          expireEntries(now);
        } finally {
          unlock();
          // don't call postWriteCleanup as we're in a read
        }
      }
    }

    @GuardedBy("this")
    void expireEntries(long now) {
      drainRecencyQueue();

      ReferenceEntry<K, V> e;