public static ClientHealthMonitor getInstance(InternalCache cache, int maximumTimeBetweenPings,
      CacheClientNotifierStats stats) {
    createInstance(cache, maximumTimeBetweenPings, stats);
    return instance;
  }
Factory method to construct or return the singleton <code>ClientHealthMonitor</code> instance.

@param cache The GemFire <code>Cache</code>
@param maximumTimeBetweenPings The maximum time allowed between pings before determining the
       client has died and interrupting its sockets.
@return The singleton <code>ClientHealthMonitor</code> instance
geode-core/src/main/java/org/apache/geode/internal/cache/tier/sockets/ClientHealthMonitor.java