nameserv::auto(n)					       Name service facility						 nameserv::auto(n)

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NAME

       nameserv::auto - Name service facility, Client Extension

SYNOPSIS

       package require Tcl  8.4

       package require nameserv::auto  ?0.3?

       package require nameserv

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DESCRIPTION

       Please read the document Name service facility, introduction first.

       This  package provides the exact same API as is provided by package nameserv, i.e the regular name service client. It differs from the for-
       mer by taking measures to ensure that longer-lived data, i.e. bound names, continuous and unfulfilled async searches, survive the  loss	of
       the connection to the name server as much as is possible.

       This  means that the bound names and continuous and unfulfilled async searches are remembered client-side and automatically re-entered into
       the server when the connection comes back after its loss. For bound names there is one important limitation to such restoration: It is pos-
       sible that a name of this client was bound by a different client while the connection was gone. Such names are fully lost, and the best the
       package can and will do is to inform the user of this.

API

       The user-visible API is mainly identical the API of nameserv and is therefore not described here. Please read the  documentation  of  name-
       serv.

       The differences are explained in the sections OPTIONS and EVENTS.

OPTIONS

       This  package supports all the option of package nameserv, and one more. The additional option allows the user to specifies the time inter-
       val between attempts to restore a lost connection.

       -delay milliseconds
	      The value of this option is an integer value > 0 which specifies the interval to wait between attempts to restore a lost connection,
	      in milliseconds. The default value is 1000, i.e. one second.

EVENTS

       This package generates all of the events of package nameserv, and two more. Both events are generated for the tag nameserv.

       lost-name
	      This  event  is  generated when a bound name is truly lost, i.e. could not be restored after the temporary loss of the connection to
	      the name server. It indicates that a different client took ownership of the name while this client was out of contact.

	      The detail information of the event will be a Tcl dictionary containing two keys, name, and data. Their values hold all the informa-
	      tion about the lost name.

       re-connection
	      This  event  is  generated  when	the  connection to the server is restored. The remembered data has been restored when the event is
	      posted.

	      The event has no detail information.

DESIGN

       The package is implemented on top of the regular nameservice client, i.e.  package nameserv. It detects the loss of the connection by  lis-
       tening for lost-connection events, on the tag nameserv.

       It  reacts  to  such  events by starting a periodic timer and trying to reconnect to the server whenver this timer triggers. On success the
       timer is canceled, a re-connection event generated, and the package proceeds to re-enter the remembered bound names and continous searches.

       Another loss of the connection, be it during or after re-entering the remembered information  simply  restarts  the  timer  and	subsequent
       reconnection attempts.

BUGS, IDEAS, FEEDBACK
       This document, and the package it describes, will undoubtedly contain bugs and other problems.  Please report such in the category nameserv
       of the Tcllib SF Trackers [http://sourceforge.net/tracker/?group_id=12883].  Please also report any ideas for enhancements you may have for
       either package and/or documentation.

SEE ALSO

       nameserv(n)

KEYWORDS

       automatic, client, name service, reconnect, restore

CATEGORY

       Networking

COPYRIGHT

       Copyright (c) 2007-2008 Andreas Kupries <andreas_kupries@users.sourceforge.net>

nns									0.3							 nameserv::auto(n)