Re: DSML library version .01

[Graham B. <gb...@po...>]

OK, I have been thinking about this some more.

On Fri, May 26, 2000 at 08:58:20AM -0500, Mark Wilcox wrote:
> > I have not tried the code, but from looking at it I have one concern.
> > It seems that the whole DSML file must be read into memory in one go.
> 
> I'll have to double-check this. I can't remember if XML::Parser's callback functions use
> streaming or load the whole file.

It's not that XML::Parser reads the whole file at one. It is that you read all
the entries from teh XML file into @results. So you are loading them all into
memory.

I have been considering if we really need an API like LDIF where the user does
read_entry() to get the next in the file.

From my reading of XML::Parser there is no way to do this. When you tell
it to parse it parses the whole file.

So I was thinking that maybe XML::DSML should just use callbacks itself.

For example have the user pass a sub reference which will be called
whenever an entry is read.

This can be extended when we start to read the schema, and we can have a different
sub to call. Or we can just have the user check the type of object passed.

I don't think this would be too much of a setback as I would think that most of
the time the current LDIF is used in a loop anyway.

So what we could end up with is something like

  $dsml = Net::LDAP::DSML->new();

  $dsml->process( $file, entry =>  \&process_entry, schema => \&process_schema )
     or die $dsml->error;

Now for writing we could do

  $dsml->open($file,"w");
  $dsml->write($entry);
  $dsml->write($schema);
  $dsml->close;

The open would write the header and the close would write the footer.

Thoughts ?

Graham.