On Tue, Jan 06, 2004 at 01:00:36PM -0600, david nicol wrote:
that works too. The first time I worked with dbm files, it was
with an implementation that produced both a .pag and a .dir file
for a database, so there was no one data file to lock. If I just use
Copendbm and let Perl select an
* david nicol [EMAIL PROTECTED] [2004-01-06 20:03]:
I'm also safe from the implementation needing the flock bits if
it uses them. I don't know that they do, but I also don't know
that they don't.
You're also safe because tieing and locking is not an atomic
operation, and some DBM libraries
On Fri, 2003-12-19 at 22:26, Terrence Brannon wrote:
I quit using DBM files after one corrupted on me during an aborted
write.
A similar negative experience got me in the habit of being strict
with locking discipline when using DBM.
open advisory file
lock advisory file
Okay, so I ended up having more time last night than I thought I would.
I finished Tie::Filter and the filter packages for scalars, arrays, and
hashes. I've decided to hold off on writing one for handles as it is a
significantly more complicated problem--and it might be better as an
IO:: class.
Andrew Sterling Hanenkamp wrote:
use Storable qw(freeze thaw);
use Tie::HashWrapper;
tie my %wrappee, 'AnyDBM_File', ...;
tie my %hash, 'Tie::HashWrapper', \%wrappee,
-inflate_value = sub { thaw(shift) },
-deflate_value = sub { freeze(shift) };
$hash{a}{complicated}[4]{data} = [
On Wed, Dec 17, 2003 at 02:00:23PM -0600, Andrew Sterling Hanenkamp wrote:
I would like the ability to store a complicated record inside of a DBM
file. I looked in the usual places and perldoc -q DBM gives me:
Either stringify the structure yourself (no fun), or else get
the
On Thu, 2003-12-18 at 05:59, A. Pagaltzis wrote:
I'd prefer if it didn't (ab)use the minus on literal string.
There's nothing ambiguous in the syntax that might require it.
I disagree, since the tie call could include -inflate_key and
-deflate_value. It is also legal to say:
tie %hash,
On Thu, 2003-12-18 at 04:26, Tim Bunce wrote:
I'd add a -1 to the split and not in the docs that the example
won't handle undefs.
Fine. The example is relatively close to what I need the package for,
but as a general example it's probably a poor one.
I didn't like it at first but the more I
I would like to revise my original query into a proposal in light of the
comments I've received to now suggest a Tie::Filter namespace for
filtering Tie classes. There could be specialized classes
Tie::Filter::Scalar, Tie::Filter::Array, Tie::Filter::Hash, and
Tie::Filter::Handle.
However, at
Another question I want to add to my proposal is: should the code
references work by modifying $_ in-place (as with DBM filters) or should
the code take an argument and return a result. I think I lean towards
the modification of $_ in-place as it seems a little more Perlesque.
Cheers,
Sterling
Andrew Sterling Hanenkamp [EMAIL PROTECTED] wrote
use Storable qw(freeze thaw);
use Tie::HashWrapper;
tie my %wrappee, 'AnyDBM_File', ...;
tie my %hash, 'Tie::HashWrapper', \%wrappee,
-inflate_value = sub { thaw(shift) },
-deflate_value = sub { freeze(shift) };
Or rather more
* Andrew Sterling Hanenkamp [EMAIL PROTECTED] [2003-12-18 20:01]:
I think I lean towards the modification of $_ in-place as it
seems a little more Perlesque.
Given the name Tie::Filter, I'd agree.
--
Regards,
Aristotle
If you can't laugh at yourself, you don't take life seriously enough.
* Andrew Sterling Hanenkamp [EMAIL PROTECTED] [2003-12-18 19:02]:
However, at this point, this project is becoming far more serious than
the original idea
Which is always good when code's meant to go onto CPAN :-)
The wrapped object must be of the same type as the tie itself
since the
On Thu, 2003-12-18 at 14:11, A. Pagaltzis wrote:
I do, because for simple one-off uses, the standard mechanism
requires too much baggage. Sometimes I'd like to use tieing in a
10-line script; not having to create a package and populate it
with a half dozen subs, which is alone 15 lines of red
On Wed, 2003-12-17 at 23:25, Andrew Sterling Hanenkamp wrote:
tie my %hash, 'Tie::HashWrapper', \%wrappee,
-inflate_value = sub { thaw(shift) },
-deflate_value = sub { freeze(shift) };
$hash{a}{complicated}[4]{data} = [ 'structure' ];
warning: the above will not autovivify.
What I want to know is, is Tie::HashWrapper a good name? If you don't
like that name, what might you call it? HashWrapper sounds kind of dorky
to me, but that's what first came to mind and I didn't want to spend all
day trying to name it, I wanted to play code monkey.
Cheers,
Sterling
I
On Thu, 2003-12-18 at 14:11, A. Pagaltzis wrote:
I like them better as well, but I think (in|de)flate is too
specific considering the generic nature of these filtering tie
modules. I can't think of any better terminology of my own; maybe
it would be best to simple reuse the names we're already
I would like the ability to store a complicated record inside of a DBM
file. I looked in the usual places and perldoc -q DBM gives me:
Either stringify the structure yourself (no fun), or else get
the MLDBM (which uses Data::Dumper) module from CPAN and layer
it on top of
On Wed, Dec 17, 2003 at 02:00:23PM -0600, Andrew Sterling Hanenkamp wrote:
Therefore, I went in search of a solution to automate the
stringification. I didn't find anything other than MLDBM for doing
something like this and it seems like a little much for my purposes. All
I need is
On Wed, 2003-12-17 at 14:00, Andrew Sterling Hanenkamp wrote:
Therefore, I went in search of a solution to automate the
stringification. I didn't find anything other than MLDBM for doing
something like this and it seems like a little much for my purposes. All
I need ...
As I understand it,
being misunderstood or no one has an answer to my
questions. I believe I was asking for it with the subject line of
Simple multi-level tie. What I should have wrote is Wrapping hashes
with arbitrary inflate/deflate methods.
This is a tool that adds syntactic sugar to hashes. I developed
On 12/18/2003 12:25 AM, Andrew Sterling Hanenkamp wrote:
Wrapping hashes with arbitrary inflate/deflate methods.
This is a tool that adds syntactic sugar to hashes. I developed it for
the purpose of making complicated storage in hashes tied to DBM files
nicer. It doesn't matter if you use
]
Sent: Wednesday, December 17, 2003 1:00 PM
To: Module Authors
Subject: Simple multi-level tie
I would like the ability to store a complicated record inside of a DBM
file. I looked in the usual places and perldoc -q DBM gives me:
Either stringify the structure yourself (no fun), or else
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