public File getFile() {
      return archiveName;
    }
Checks to see if the archive has changed since the StatArchiverReader instance was created or
last updated. If the archive has additional samples then those are read the resource
instances maintained by the reader are updated.
<p>
Once closed a reader can no longer be updated.

@return true if update read some new data.
@throws IOException if <code>archiveName</code> could not be opened read, or closed.
geode-core/src/main/java/org/apache/geode/internal/statistics/StatArchiveReader.java