From 85af504a4bc9ce2e158dfe0cb9dc3750d1cf98f5 Mon Sep 17 00:00:00 2001
From: fukachan <fukachan>
Date: Tue, 18 Mar 2003 14:14:50 +0000
Subject: modify chaddr algorithm: "del() and add()" -> "add() and del()". #
 XXX WHICH STEP IS IT BETTER TO UPDATE LIST ? #  [I] 1. remove the old address
 only if $new_address not included. #      2. add the newadderss # [II] 1. add
 the newadderss #      2. remove the old address only if $new_address not
 included. # # Plan [II] is better for authentication without reader lock. #
 Consider the case the process executing chaddr is preempted, and # another
 distributing process starts to run.

---
 fml/lib/FML/Command/UserControl.pm | 33 +++++++++++++++++++++------------
 1 file changed, 21 insertions(+), 12 deletions(-)

(limited to 'fml/lib/FML/Command/UserControl.pm')

diff --git a/fml/lib/FML/Command/UserControl.pm b/fml/lib/FML/Command/UserControl.pm
index fc95b861..b405de79 100644
--- a/fml/lib/FML/Command/UserControl.pm
+++ b/fml/lib/FML/Command/UserControl.pm
@@ -4,7 +4,7 @@
 #   All rights reserved. This program is free software; you can
 #   redistribute it and/or modify it under the same terms as Perl itself.
 #
-# $FML: UserControl.pm,v 1.28 2003/03/17 13:27:15 fukachan Exp $
+# $FML: UserControl.pm,v 1.29 2003/03/18 10:42:41 fukachan Exp $
 #
 
 package FML::Command::UserControl;
@@ -277,36 +277,45 @@ sub _try_chaddr_in_map
     # 3. both conditions are o.k., here we go!
     # XXX-TODO: this condition is correct ?
     # XXX-TODO: we should remove old one when both old and new ones exist.
+    # XXX WHICH STEP IS IT BETTER TO UPDATE LIST ?
+    #  [I] 1. remove the old address only if $new_address not included.
+    #      2. add the newadderss 
+    # [II] 1. add the newadderss 
+    #      2. remove the old address only if $new_address not included.
+    # 
+    # Plan [II] is better for authentication without reader lock.
+    # Consider the case the process executing chaddr is preempted, and
+    # another distributing process starts to run.
+    # 
     if ($is_old_address_ok && $is_new_address_ok) {
-	# remove the old address only if $new_address not included.
 	{
 	    my $obj = new IO::Adapter $map, $config;
-	    $obj->touch();
-
 	    $obj->open();
-	    $obj->delete( $old_address_in_map );
+	    $obj->add( $new_address );
 	    unless ($obj->error()) {
-		Log("delete $old_address from map=$map");
+		Log("add $new_address to map=$map");
 	    }
 	    else {
-		LogError("fail to delete $old_address to map=$map");
+		LogError("fail to add $new_address to map=$map");
 	    }
-	    $obj->close();	
+	    $obj->close();
 	}
 
 	# restart map to add the new address.
 	# XXX we need to restart or rewrind map.
 	{
 	    my $obj = new IO::Adapter $map, $config;
+	    $obj->touch();
+
 	    $obj->open();
-	    $obj->add( $new_address );
+	    $obj->delete( $old_address_in_map );
 	    unless ($obj->error()) {
-		Log("add $new_address to map=$map");
+		Log("delete $old_address from map=$map");
 	    }
 	    else {
-		LogError("fail to add $new_address to map=$map");
+		LogError("fail to delete $old_address to map=$map");
 	    }
-	    $obj->close();
+	    $obj->close();	
 	}
     }
 }
-- 
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