public Set<String> getComponents(String service) {
    Set<String> componentSet = components.get(service);
    return componentSet == null ? Collections.<String>emptySet() : componentSet;
  }
Get the components for the given service.

@param service  the service name

@return the set of component names for the given service name
contrib/ambari-scom/ambari-scom-server/src/main/java/org/apache/ambari/msi/ClusterDefinition.java