@Override
  public StaticClusterManager getClusterMap() {
    if (staticClusterManager == null) {
      staticClusterManager =
          new StaticClusterManager(partitionLayout, clusterMapConfig.clusterMapDatacenterName, metricRegistry);
    }
    return staticClusterManager;
  }
Instantiate an instance of this factory.
@param partitionLayout the {@link PartitionLayout} to use.
ambry-clustermap/src/main/java/com/github/ambry/clustermap/StaticClusterAgentsFactory.java