What is the best way to exit from observer?

[Dmitri10]

I have a very large csv file. So I don't need to have a full parsing on my local-machine and want to exit after 2000 rows. I'm using throwing exception for now like this:

$interpreter->addObserver(function (array $row) use (&$i, &$captions) {
      // todo remove it for non-local server
      if ($i > 2000) {
           throw new StrictViolationException('Cant exit with another way', 100);
            /* return / return false don't work - 
             * it still continues  and I don't need exit() function
            */
       }
     $i++;
    //do smth...
});

try {
      $lexer->parse($file, $interpreter);
 } catch (StrictViolationException $e) {
       // we'll be here
}
print_r("script continues and that's great");

So what's the best way to go out from observer?