X-Git-Url: https://git.p6c8.net/selfforum.git/blobdiff_plain/85946d0838c74882bd707bd1f5dbeeb7ea80944f..4efca15bb2136c3e226eb4e372776fad95a955c9:/selfforum-cgi/shared/Lock/_static.pm

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+package Lock::_static;
+
+################################################################################
+#                                                                              #
+# File:        shared/Lock/_static.pm                                          #
+#                                                                              #
+# Authors:     Andre Malo       <nd@o3media.de>, 2001-05-25                    #
+#                                                                              #
+# Description: belongs to Locking and Filehandle class                         #
+#              NO PUBLIC USE                                                   #
+#              save the lock object static information                         #
+#              (because the lock object is a blessed file handle)              #
+#                                                                              #
+################################################################################
+
+use strict;
+use vars qw(
+  $VERSION
+);
+
+use Carp;
+
+################################################################################
+#
+# Version check
+#
+$VERSION = do { my @r =(q$Revision$ =~ /\d+/g); sprintf "%d."."%02d" x $#r, @r };
+
+################################################################################
+#
+# Variables
+#
+my (%static, %access);
+
+# define standard timeouts
+# (seconds)
+#
+my %timeout = (
+  shared     => 10,       # for shared and exclusive shared locks
+  exclusive  => 10,       # for exclusive locks
+  violent    => 600,      # for violent unlocks (10 minutes should justify a process abort)
+  master     => 20        # for master locks
+);
+
+### timeout ####################################################################
+#
+# set and read out the timeout
+#
+# Params: $type - timeout type (defined in %timeout, see above)
+#                 in this case, the specified timeout will be returned
+#         OR
+#         %hash - (type => time) pairs
+#                  the specified timouts will be set
+#
+# Return: specified timeout or nothing
+#
+sub timeout {
+  my ($self, @ary) = @_;
+
+  return if (@ary == 0);
+
+  if (@ary == 1) {
+    my $type = shift @ary;
+    my $hash = $self -> get_static('timeout') || {};
+
+    return defined $hash->{$type}
+    ? $hash -> {$type}
+    : $timeout {$type};
+  }
+
+  my %hash = @ary;
+  $self->set_static(timeout => {%{$self -> get_static('timeout') || {}},%hash});
+
+  return;
+}
+
+### set_static #################################################################
+#
+# set an object property
+#
+# Params: $key   - property and method name
+#         $value - property
+#
+# Return: $value or nothing
+#
+sub set_static {
+  my ($self, $key, $value) = @_;
+
+  $static{$self}={} unless exists($static{$self});
+  $static{$self}->{$key} = $value;
+
+  defined wantarray and return $value;
+  return;
+}
+
+### get_static #################################################################
+#
+# read out an object property
+#
+# Params: $key - property name
+#
+# Return: value or false
+#
+sub get_static {
+  my ($self, $key) = @_;
+
+  return unless exists($static{$self});
+  $static{$self}->{$key};
+}
+
+################################################################################
+#
+# define the lock file names
+#
+sub reffile    {shift -> filename . '.lock.ref'}
+sub lockfile   {shift -> filename . '.lock'}
+sub reflock    {shift -> filename . '.lock.ref.lock'}
+sub exshlock   {shift -> filename . '.exshlock'}
+sub masterlock {shift -> filename . '.masterlock'}
+
+################################################################################
+#
+# autoload the general access methods
+#
+BEGIN {
+  %access = map {$_=>1} qw(
+    filename
+    locked_shared
+    locked_exclusive
+    locked_exsh
+    es_announced
+    announced
+  );
+}
+AUTOLOAD {
+  my $self = shift;
+  (my $attr = $Lock::_static::AUTOLOAD) =~ s/.*:://;
+  return if ($attr eq 'DESTROY');
+
+  if ($access{$attr}) {
+    return $self -> get_static($attr);
+  }
+  else {
+    eval {
+      local $SIG{__DIE__};
+      my $sup = "SUPER::$attr";
+      return $self -> $sup(@_);
+    };
+    croak $@;
+  }
+}
+
+################################################################################
+#
+# destrcutor - try to unlock, if neccessary and possible
+#
+DESTROY {
+  my $self = shift;
+
+  $self -> unlock if ($self =~ /^Lock=/);
+  delete $static{$self};
+}
+
+################################################################################
+#
+# terminator, catch sigTERM and (try to) destroy all objects
+#
+sub destroy_all {
+  $SIG{TERM} = \&destroy_all;
+
+  $_ -> unlock for (grep ((ref $_ and /^Lock=/) => keys %static));
+
+  exit (0);
+}
+BEGIN {
+  $SIG{TERM} = \&destroy_all;
+}
+
+# keep 'require' happy
+1;
+
+#
+#
+### end of Lock::_static #######################################################
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