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git-svn: clean up caching of SVN::Ra functions

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This patch was originally intended to make the Perl GC more
sensitive to the SVN::Pool objects and not accidentally clean
them up when they shouldn't be (causing segfaults).  That didn't
work, but this patch makes the code a bit cleaner regardless

Put our caches for get_dir and check_path calls directly into
the SVN::Ra object so they auto-expire when it is destroyed.

dirents returned by get_dir() no longer needs the pool object
stored persistently along with the cache data, as they'll be
converted to native Perl hash references.

Since calling rev_proplist repeatedly per-revision is no longer
needed in git-svn, we do not cache calls to it.

Signed-off-by: Eric Wong <normalperson@yhbt.net>
This commit is contained in:
Eric Wong 2007-05-13 01:04:43 -07:00 committed by Junio C Hamano
parent 645833b564
commit 0dc03d6a30
1 changed files with 42 additions and 26 deletions
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68
git-svn.perl
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@ -1390,7 +1390,7 @@ sub traverse_ignore {
}
}
foreach (sort keys %$dirent) {
next if $dirent->{$_}->kind != $SVN::Node::dir;
next if $dirent->{$_}->{kind} != $SVN::Node::dir;
$self->traverse_ignore($fh, "$path/$_", $r);
}
}
@ -2888,7 +2888,7 @@ my ($can_do_switch, %ignored_err, $RA);
BEGIN {
# enforce temporary pool usage for some simple functions
my $e;
foreach (qw/get_latest_revnum get_uuid get_repos_root/) {
foreach (qw/rev_proplist get_latest_revnum get_uuid get_repos_root/) {
$e .= "sub $_ {
my \$self = shift;
my \$pool = SVN::Pool->new;
@ -2897,29 +2897,7 @@ BEGIN {
wantarray ? \@ret : \$ret[0]; }\n";
}
# get_dir needs $pool held in cache for dirents to work,
# check_path is cacheable and rev_proplist is close enough
# for our purposes.
foreach (qw/check_path get_dir rev_proplist/) {
$e .= "my \%${_}_cache; my \$${_}_rev = 0; sub $_ {
my \$self = shift;
my \$r = pop;
my \$k = join(\"\\0\", \@_);
if (my \$x = \$${_}_cache{\$r}->{\$k}) {
return wantarray ? \@\$x : \$x->[0];
}
my \$pool = SVN::Pool->new;
my \@ret = \$self->SUPER::$_(\@_, \$r, \$pool);
if (\$r != \$${_}_rev) {
\%${_}_cache = ( pool => [] );
\$${_}_rev = \$r;
}
\$${_}_cache{\$r}->{\$k} = \\\@ret;
push \@{\$${_}_cache{pool}}, \$pool;
wantarray ? \@ret : \$ret[0]; }\n";
}
$e .= "\n1;";
eval $e or die $@;
eval "$e; 1;" or die $@;
}
sub new {
@ -2952,9 +2930,47 @@ sub new {
$self->{svn_path} = $url;
$self->{repos_root} = $self->get_repos_root;
$self->{svn_path} =~ s#^\Q$self->{repos_root}\E(/|$)##;
$self->{cache} = { check_path => { r => 0, data => {} },
get_dir => { r => 0, data => {} } };
$RA = bless $self, $class;
}
sub check_path {
my ($self, $path, $r) = @_;
my $cache = $self->{cache}->{check_path};
if ($r == $cache->{r} && exists $cache->{data}->{$path}) {
return $cache->{data}->{$path};
}
my $pool = SVN::Pool->new;
my $t = $self->SUPER::check_path($path, $r, $pool);
$pool->clear;
if ($r != $cache->{r}) {
%{$cache->{data}} = ();
$cache->{r} = $r;
}
$cache->{data}->{$path} = $t;
}
sub get_dir {
my ($self, $dir, $r) = @_;
my $cache = $self->{cache}->{get_dir};
if ($r == $cache->{r}) {
if (my $x = $cache->{data}->{$dir}) {
return wantarray ? @$x : $x->[0];
}
}
my $pool = SVN::Pool->new;
my ($d, undef, $props) = $self->SUPER::get_dir($dir, $r, $pool);
my %dirents = map { $_ => { kind => $d->{$_}->kind } } keys %$d;
$pool->clear;
if ($r != $cache->{r}) {
%{$cache->{data}} = ();
$cache->{r} = $r;
}
$cache->{data}->{$dir} = [ \%dirents, $r, $props ];
wantarray ? (\%dirents, $r, $props) : \%dirents;
}
sub DESTROY {
# do not call the real DESTROY since we store ourselves in $RA
}
@ -3169,7 +3185,7 @@ sub match_globs {
return unless scalar @x == 3;
my $dirents = $x[0];
foreach my $de (keys %$dirents) {
next if $dirents->{$de}->kind != $SVN::Node::dir;
next if $dirents->{$de}->{kind} != $SVN::Node::dir;
my $p = $g->{path}->full_path($de);
next if $exists->{$p};
next if (length $g->{path}->{right} &&