'\"
'\" Generated from file 'nns_auto\&.man' by tcllib/doctools with format 'nroff'
'\" Copyright (c) 2007-2008 Andreas Kupries <andreas_kupries@users\&.sourceforge\&.net>
'\"
.TH "nameserv::auto" n 0\&.4 tcllib "Name service facility"
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.SH NAME
nameserv::auto \- Name service facility, Client Extension
.SH SYNOPSIS
package require \fBTcl 8\&.5 9\fR
.sp
package require \fBnameserv::auto ?0\&.4?\fR
.sp
package require \fBnameserv\fR
.sp
.BE
.SH DESCRIPTION
Please read the document \fIName service facility, introduction\fR
first\&.
.PP
This package provides the \fIexact\fR same API as is provided by
package \fBnameserv\fR, i\&.e\&. the regular name service client\&. It
differs from the former by taking measures to ensure that longer-lived
data, i\&.e\&. bound names, continuous and unfullfilled async searches,
survive the loss of the connection to the name server as much as is
possible\&.
.PP
This means that the bound names and continuous and unfullfilled 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
possible 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\&.
.SH API
The user-visible API is mainly identical to the API of \fBnameserv\fR
and is therefore not described here\&. Please read the documentation of
\fBnameserv\fR\&.
.PP
The differences are explained below, in the sections \fBOPTIONS\fR and
\fBEVENTS\fR\&.
.SH OPTIONS
This package supports all the options of package \fBnameserv\fR,
plus one more\&. The additional option allows the user to specify the
time interval between attempts to restore a lost connection\&.
.TP
\fB-delay\fR \fImilliseconds\fR
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 \fB1000\fR, i\&.e\&. one second\&.
.PP
.SH EVENTS
This package generates all of the events of package \fBnameserv\fR,
plus two more\&. Both events are generated for the tag \fInameserv\fR\&.
.TP
\fIlost-name\fR
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\&.
.sp
The detail information of the event will be a Tcl dictionary
containing two keys, \fBname\fR, and \fBdata\fR\&. Their values hold
all the information about the lost name\&.
.TP
\fIre-connection\fR
This event is generated when the connection to the server is
restored\&. The remembered data has been restored when the event is
posted\&.
.sp
The event has no detail information\&.
.PP
.SH DESIGN
The package is implemented on top of the regular nameservice client,
i\&.e\&. package \fBnameserv\fR\&. It detects the loss of the
connection by listening for \fIlost-connection\fR events, on the tag
\fInameserv\fR\&.
.PP
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 \fIre-connection\fR event generated, and the
package proceeds to re-enter the remembered bound names and continuous
searches\&.
.PP
Another loss of the connection, be it during or after re-entering the
remembered information simply restarts the timer and subsequent
reconnection attempts\&.
.SH "BUGS, IDEAS, FEEDBACK"
This document, and the package it describes, will undoubtedly contain
bugs and other problems\&.
Please report such in the category \fInameserv\fR of the
\fITcllib Trackers\fR [http://core\&.tcl\&.tk/tcllib/reportlist]\&.
Please also report any ideas for enhancements you may have for either
package and/or documentation\&.
.PP
When proposing code changes, please provide \fIunified diffs\fR,
i\&.e the output of \fBdiff -u\fR\&.
.PP
Note further that \fIattachments\fR are strongly preferred over
inlined patches\&. Attachments can be made by going to the \fBEdit\fR
form of the ticket immediately after its creation, and then using the
left-most button in the secondary navigation bar\&.
.SH "SEE ALSO"
nameserv(n)
.SH KEYWORDS
automatic, client, name service, reconnect, restore
.SH CATEGORY
Networking
.SH COPYRIGHT
.nf
Copyright (c) 2007-2008 Andreas Kupries <andreas_kupries@users\&.sourceforge\&.net>

.fi
