unique id generator

lib/WebGUI/Id.pm

@@ -0,0 +1,64 @@
+package WebGUI::Id;
+
+
+=head1 LEGAL
+
+ -------------------------------------------------------------------
+  WebGUI is Copyright 2001-2004 Plain Black LLC.
+ -------------------------------------------------------------------
+  Please read the legal notices (docs/legal.txt) and the license
+  (docs/license.txt) that came with this distribution before using
+  this software.
+ -------------------------------------------------------------------
+  http://www.plainblack.com                     info@plainblack.com
+ -------------------------------------------------------------------
+
+=cut
+
+use Digest::MD5;
+use strict;
+use Time::HiRes qw( gettimeofday usleep );
+use WebGUI::Session;
+
+
+
+
+=head1 NAME
+
+Package WebGUI::Id
+
+=head1 DESCRIPTION
+
+This package generates global unique ids, sometimes called GUIDs. A global unique ID is guaranteed to be unique everywhere and at everytime.
+
+NOTE: There is no such thing as perfectly unique ID's, but the chances of a duplicate ID are so minute that they are effectively unique.
+
+=head1 SYNOPSIS
+
+ use WebGUI::Id;
+
+ my $id = WebGUI::Id::generate();
+
+=head1 FUNCTIONS
+
+These subroutines are available from this package:
+
+=cut
+
+#-------------------------------------------------------------------
+
+=head2 generate
+
+This function generates a global unique id.
+
+=cut
+
+sub generate {
+  	my($s,$us)=gettimeofday();
+  	my($v)=sprintf("%06d%10d%06d%255s",$us,$s,$$,$session{config}{defaultSiteName});
+	return Digest::MD5::md5_base64($v);
+}
+
+1;
+
+