public void testClose() {
    try {
      crf.channel.close();
    } catch (IOException ignore) {
    }
    try {
      crf.raf.close();
    } catch (IOException ignore) {
    }
    crf.RAFClosed = true;
    try {
      drf.channel.close();
    } catch (IOException ignore) {
    }
    try {
      drf.raf.close();
    } catch (IOException ignore) {
    }
    drf.RAFClosed = true;
  }
Close the files of a oplog but don't set any state. Used by unit tests
geode-core/src/main/java/org/apache/geode/internal/cache/Oplog.java