On Tue, 22 Jun 2010 09:51:33 +0000, Jens Rehsack
<[email protected]> wrote:
> Hi DBI Developers,
>
> I need a nudge to the right direction for my ideas how to get DBD::Sys
> more extensible. My current way is, each plugin can define tables and
> each table has to define it's column names and a way to retrieve the
> data.
>
> This is simple, works fine as long the extensions are controller by
> a group of maintainers but has one (from my point of view) nasty
> limitation:
>
> Table PROCS - Unix implementation uses Proc::ProcessTable, Win32
> implementation will use Win32::Process::Info. Of coursem they will
> reside in different plugins. When one fine day Proc::ProcessTable
> will support Win32, too - I get a conflict.
>
> So I thought the best idea would be to separate the table definitions
> from the data providers. And there I need a nudge how to do it the
> "best" way for future extensibility.
>
> Of course, other hints how to improve some things are very welcome,
> too :)
>
> Best,
> Jens
Just sharing some finds of recent history ...
--8<--- a code snippet from (semi)portable code
if ($^O eq "MSWin32") {
eval {
require Win32::Process::Info;
Win32::Process::Info->import ();
require Win32::Process::CommandLine;
Win32::Process::CommandLine->import ();
for (Win32::Process::Info->new ()->GetProcInfo ()) {
(my $uid = $_->{OwnerSid} // 0) =~ s/.*-//;
my $cli = "";
Win32::Process::CommandLine::GetPidCommandLine ($_->{ProcessId},
$cli);
$cli ||= "";
$cli =~ s{^\S+\\}{};
$cli =~ s{\s+$}{};
push @ps, {
cmd => $cli || $_->{Name} || "<dead>", # ExecutablePath
pid => $_->{ProcessId},
ppid => 0,
uid => $uid,
gid => 0,
pri => 0,
nice => 0,
start => fmt_stime ($_->{CreationDate}),
run => fmt_time (int (($_->{KernelModeTime} // 0) +
($_->{UserModeTime} // 0) + .499)),
status => $_->{_status},
};
}
};
}
else {
require Proc::ProcessTable;
sub prtime ($)
{
my ($f1, $f2, $p, $t) = ($^O eq "linux" ? ((1000000) x 2) : (1, 100),
@_);
use integer;
eval { $t = $p->time / $f1 };
$t //= ($p->utime + $p->stime) / $f2;
fmt_time ($t);
} # prtime
sub prstime ($)
{
fmt_stime ($_[0]->start);
} # prstime
my $pst = Proc::ProcessTable->new ();
#print STDERR join ", ", $pst->fields, "\n";
for (@{$pst->table}) {
my $cmd = defined $_->{gid} ? $_->cmndline : "<dead>";
my $pri = exists $_->{pri} ? $_->{pri} :
exists $_->{priority} ? $_->{priority} : 0;
my $nce = exists $_->{nice} ? $_->{nice} : 0;
my $stt = exists $_->{state} ? $_->{state} : 0;
push @ps, {
cmd => $cmd,
pid => $_->pid,
ppid => $_->ppid,
uid => $_->uid,
gid => $_->gid,
pri => $pri,
nice => $nce,
start => prstime $_,
run => prtime $_,
status => $stt,
};
}
}
-->8---
Note that some Win32 methods can only be used with enough rights.
Above snippet is what worked best for *me* on my systems (using
Strawberry perl).
--
H.Merijn Brand http://tux.nl Perl Monger http://amsterdam.pm.org/
using 5.00307 through 5.12 and porting perl5.13.x on HP-UX 10.20, 11.00,
11.11, 11.23, and 11.31, OpenSuSE 10.3, 11.0, and 11.1, AIX 5.2 and 5.3.
http://mirrors.develooper.com/hpux/ http://www.test-smoke.org/
http://qa.perl.org http://www.goldmark.org/jeff/stupid-disclaimers/
