(ar0n: pnotes) Re: Sharing data structures among http processes?

[ar0n]

You may have already looked at this, but both Perl and PHP support Apache notes, which allows you to pass data (structures) between handlers. From the mod_perl guide:

Let's say that you wrote a few handlers to process a request, and they all need to share some custom Perl data structure. The pnotes() method comes to your rescue.

# a handler that gets executed first
my %my_data = (foo => 'mod_perl', bar => 'rules');
$r->pnotes('my_data' => \%my_data);

The handler prepares the data in hash %my_data and calls pnotes() method to store the data internally for other handlers to re-use. All the subsequently called handlers can retrieve the stored data in this way:

my $info = $r->pnotes('my_data');
print $info->{foo};

prints:

mod_perl

The stored information will be destroyed at the end of the request.

I've been meaning to play with it for a while, but haven't gotten around to it yet. It sure looks cool ;)

[ ar0n ]

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update: Hrm, I guess I misunderstood the question. Sorry 'bout that.

[tomhukins]

This is fine for passing data between handlers or to subrequests within an individual httpd process, but it doesn't share data between separate processes, as sutch asked.

Apache::SharedMem can be used to share data between Apache processes.