@Override
  public CloudDestination getCloudDestination() throws IllegalStateException {
    return destination;
  }
Constructor for {@link LatchBasedInMemoryCloudDestinationFactory}.
@param verifiableProperties {@link VerifiableProperties} object.
@param metricRegistry  {@link MetricRegistry} object.
@param clusterMap {@link ClusterMap} object.
@param accountService {@link AccountService} object.
ambry-vcr/src/test/java/com/github/ambry/vcr/LatchBasedInMemoryCloudDestinationFactory.java