NAME

       tcl::chan::facade - Facade channel

SYNOPSIS

       package require Tcl  8.5

       package require TclOO

       package require logger

       package require tcl::chan::core  ?1?

       package require tcl::chan::facade  ?1?

       ::tcl::chan::facade chan

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DESCRIPTION

       The tcl::chan::facade package provides a command creating facades to other channels. These
       are channels which own a single subordinate channel and delegate all operations to.

       The main use for facades is the debugging of actions on  a  channel.  While  most  of  the
       information  could  be tracked by a virtual channel transformation it does not have access
       to the event-related operation, and furthermore they are only available in Tcl 8.6.

       Therefore this channel, usable with Tcl 8.5, and having access to everything going on  for
       a channel.

       The intercepted actions on channel are logged through package logger.

       Beyond that facades provide the following additional channel configuration options:

       -self  The TclOO object handling the facade.

       -fd    The handle of the subordinate, i.e. wrapped channel.

       -used  The last time the wrapped channel was read from or written to by the facade, as per
              clock milliseconds. A value of 0 indicates that the  subordinate  channel  was  not
              accessed at all, yet.

       -created
              The time the facade was created, as per clock milliseconds.

       -user  A free-form value identifying the user of the facade and its wrapped channel.

       Of these only option -user is writable.

API

       ::tcl::chan::facade chan
              This  command  creates  the  facade  channel  around the provided channel chan, and
              returns its handle.

BUGS, IDEAS, FEEDBACK

       This document, and the package it describes,  will  undoubtedly  contain  bugs  and  other
       problems.   Please  report  such  in  the  category  virtchannel  of  the  Tcllib Trackers
       [http://core.tcl.tk/tcllib/reportlist].  Please also report any ideas for enhancements you
       may have for either package and/or documentation.

KEYWORDS

       concatenation channel, reflected channel, tip 219, virtual channel

CATEGORY

       Channels

COPYRIGHT

       Copyright (c) 2011 Andreas Kupries <andreas_kupries@users.sourceforge.net>