private Callable<Boolean> isAlive(final HostStatSampler statSampler) {
    return statSampler::isAlive;
  }
IntegrationTests for AutoBalancer that include usage of Cache, StatSampler and
DistributedLockService.
geode-rebalancer/src/integrationTest/java/org/apache/geode/cache/util/AutoBalancerIntegrationJUnitTest.java