* simultaneously adopted and removed.
   */
  private val connections = ConcurrentLinkedQueue<RealConnection>()

  init {
    // Put a floor on the keep alive duration, otherwise cleanup will spin loop.
    require(keepAliveDuration > 0L) { "keepAliveDuration <= 0: $keepAliveDuration" }
  }

  fun idleConnectionCount(): Int =
    connections.count {
      it.withLock { it.calls.isEmpty() }
    }

    assertEquals(liveCount, originalMap.size());
    // can't compare map contents until cleanup occurs

    for (int i = 1; i <= originalCount * 2; i *= 2) {
      if (i > 1) {
        segment.expand();
      }
      assertEquals(i, segment.table.length());
      assertEquals(liveCount, countLiveEntries(map, 0));
      // expansion cleanup is sloppy, with a goal of avoiding unnecessary copies

  - [Changelog since v1.26.11](#changelog-since-v12611)
  - [Changes by Kind](#changes-by-kind-3)
    - [Feature](#feature-3)
    - [Bug or Regression](#bug-or-regression-3)
    - [Other (Cleanup or Flake)](#other-cleanup-or-flake)
  - [Dependencies](#dependencies-3)
    - [Added](#added-3)
    - [Changed](#changed-3)
    - [Removed](#removed-3)
- [v1.26.11](#v12611)
  - [Downloads for v1.26.11](#downloads-for-v12611)

  - [Changelog since v1.22.16](#changelog-since-v12216)
  - [Changes by Kind](#changes-by-kind)
    - [Feature](#feature)
    - [Bug or Regression](#bug-or-regression)
    - [Other (Cleanup or Flake)](#other-cleanup-or-flake)
  - [Dependencies](#dependencies)
    - [Added](#added)
    - [Changed](#changed)
    - [Removed](#removed)
- [v1.22.16](#v12216)
  - [Downloads for v1.22.16](#downloads-for-v12216)

        assertNotNull(heartbeatInterval);
        assertEquals(10000, heartbeatInterval.intValue());

        // Test integer conversion for cleanup days
        int cleanupDays = fessConfig.getDayForCleanup();
        // cleanupDays is primitive int, not Integer
        assertEquals(3, cleanupDays);

        // Test integer conversion for crawler processes

  ConcurrentMap<K, V> asMap();

  /**
   * Performs any pending maintenance operations needed by the cache. Exactly which activities are
   * performed -- if any -- is implementation-dependent.
   */
  void cleanUp();

  - [Changelog since v1.31.9](#changelog-since-v1319)
  - [Changes by Kind](#changes-by-kind-2)
    - [Feature](#feature-1)
    - [Bug or Regression](#bug-or-regression-2)
    - [Other (Cleanup or Flake)](#other-cleanup-or-flake)
  - [Dependencies](#dependencies-2)
    - [Added](#added-2)
    - [Changed](#changed-2)
    - [Removed](#removed-2)
- [v1.31.9](#v1319)
  - [Downloads for v1.31.9](#downloads-for-v1319)

    assertEquals(liveCount, countLiveEntries(map));
    ImmutableMap<Object, Object> originalMap = ImmutableMap.copyOf(map);
    assertEquals(liveCount, originalMap.size());
    // can't compare map contents until cleanup occurs

    for (int i = 1; i <= originalCount * 2; i *= 2) {
      if (i > 1) {
        // TODO(b/145386688): This access should be guarded by 'segment', which is not currently
        // held

    assertEquals(liveCount, countLiveEntries(map));
    ImmutableMap<Object, Object> originalMap = ImmutableMap.copyOf(map);
    assertEquals(liveCount, originalMap.size());
    // can't compare map contents until cleanup occurs

    for (int i = 1; i <= originalCount * 2; i *= 2) {
      if (i > 1) {
        // TODO(b/145386688): This access should be guarded by 'segment', which is not currently
        // held

  - [Changelog since v1.25.14](#changelog-since-v12514)
  - [Changes by Kind](#changes-by-kind)
    - [Feature](#feature)
    - [Bug or Regression](#bug-or-regression)
    - [Other (Cleanup or Flake)](#other-cleanup-or-flake)
  - [Dependencies](#dependencies-1)
    - [Added](#added-1)
    - [Changed](#changed-1)
    - [Removed](#removed-1)
- [v1.25.14](#v12514)
  - [Downloads for v1.25.14](#downloads-for-v12514)