private static long parseLong(String arg) {
    try {
      return Long.parseLong(arg);
    } catch (NumberFormatException ex) {
      throw new IllegalArgumentException(
          "Could not parse -maxOplogSize=" + arg + " because: " + ex.getMessage());
    }
  }
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