protected void assertCommitTimeAdvances(final long commitTime){
  if (commitTime <= _rootBlock.getLastCommitTime()) {
    throw new IllegalArgumentException();
  }
}

protected void assertCommitTimeAdvances ( final long commitTime ) { if ( commitTime <= _rootBlock . getLastCommitTime ( ) ) { throw new IllegalArgumentException ( ) ; } }
method verifies that the commit time strictly advances on the local store by checking against the current root block .
