public int purge(){
  if (capacity >= 0) {
    int start=size();
    Object[] cache=messageCache.toArray();
    for (int i=start - 1; i >= capacity; i--) {
      messageCache.remove((IMessage)cache[i]);
    }
    return start - size();
  }
  return 0;
}

public int purge ( ) { if ( capacity >= 0 ) { int start = size ( ) ; Object [ ] cache = messageCache . toArray ( ) ; for ( int i = start - 1 ; i >= capacity ; i -- ) { messageCache . remove ( ( IMessage ) cache [ i ] ) ; } return start - size ( ) ; } return 0 ; }
this purges the list ' s internal message cache so that the oldest messages are removed until the list ' s capacity requirements are met .
