public static void main(String[] args) {
    try {
      final SystemAdmin admin = new SystemAdmin();
      admin.initHelpMap();
      admin.initUsageMap();
      admin.invoke(args);
    } finally {
      InternalDistributedSystem sys = InternalDistributedSystem.getConnectedInstance();
      if (sys != null) {
        sys.disconnect();
      }
    }
  }
Represents a list of ResourceInst that have been combined together. Note the most common case
is for this class to only own a single ResourceInst.
geode-core/src/main/java/org/apache/geode/internal/SystemAdmin.java