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=head1 NAME |
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Coro::Storable - offer a more fine-grained Storable interface |
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=head1 SYNOPSIS |
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|
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use Coro::Storable; |
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=head1 DESCRIPTION |
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|
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This module implements a few functions from the Storable module in a way |
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so that it cede's more often. Some applications (such as the Crossfire |
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game server) sometimes need to load large Storable objects without |
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blocking the server for a long time. |
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|
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=head1 FUNCTIONS |
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|
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=over 4 |
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|
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=item $ref = thaw $pst |
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|
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Retrieve an object from the given $pst, which must have been created with |
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C<Coro::Storable::freeze> or C<Storable::store_fd>/C<Storable::store> |
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(sorry, but Storable uses incompatible formats for disk/mem objects). |
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|
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This works by calling C<Coro::cede> for every 512 bytes read in. |
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|
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=item $pst = freeze $ref |
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|
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Freeze the given scalar into a Storable object. It uses the same format as |
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C<Storable::nstore_fd> (note the C<n>). |
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This works by calling C<Coro::cede> for every write that Storable |
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issues. Unfortunately, Storable often makes many very small writes, so it |
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is rather inefficient. But it does keep the latency low. |
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|
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=back |
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|
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=cut |
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|
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package Coro::Storable; |
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|
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use strict; |
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|
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use Coro (); |
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|
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use Storable; |
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use base "Exporter"; |
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our $VERSION = '0.1'; |
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our @EXPORT = qw(freeze thaw); |
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|
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sub freeze($) { |
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open my $fh, ">:via(CoroCede)", \my $buf |
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or die "cannot open pst via CoroCede: $!"; |
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Storable::nstore_fd $_[0], $fh; |
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$buf |
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} |
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|
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sub thaw($) { |
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open my $fh, "<:via(CoroCede)", \$_[0] |
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or die "cannot open pst via CoroCede: $!"; |
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Storable::fd_retrieve $fh |
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} |
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package PerlIO::via::CoroCede; |
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|
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# generic cede-on-read/write filtering layer |
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sub PUSHED { |
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__PACKAGE__ |
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} |
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sub FILL { |
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Coro::cede; |
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read $_[1], my $buf, 512; |
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$buf |
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} |
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|
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sub WRITE { |
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Coro::cede; |
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(print {$_[2]} $_[1]) ? length $_[1] : -1 |
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} |
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1; |
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=head1 AUTHOR |
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|
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Marc Lehmann <schmorp@schmorp.de> |
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http://home.schmorp.de/ |
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|
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=cut |
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