1tcl::chan::facade(n)   Reflected/virtual channel support  tcl::chan::facade(n)
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NAME

8       tcl::chan::facade - Facade channel
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SYNOPSIS

11       package require Tcl  8.5
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13       package require TclOO
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15       package require logger
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17       package require tcl::chan::core  ?1?
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19       package require tcl::chan::facade  ?1?
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21       ::tcl::chan::facade chan
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DESCRIPTION

26       The  tcl::chan::facade  package  provides a command creating facades to
27       other channels. These are channels which own a single subordinate chan‐
28       nel and delegate all operations to.
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30       The  main  use  for  facades  is the debugging of actions on a channel.
31       While most of the information could be tracked  by  a  virtual  channel
32       transformation  it does not have access to the event-related operation,
33       and furthermore they are only available in Tcl 8.6.
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35       Therefore this channel, usable with  Tcl  8.5,  and  having  access  to
36       everything going on for a channel.
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38       The intercepted actions on channel are logged through package logger.
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40       Beyond that facades provide the following additional channel configura‐
41       tion options:
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43       -self  The TclOO object handling the facade.
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45       -fd    The handle of the subordinate, i.e. wrapped channel.
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47       -used  The last time the wrapped channel was read from or written to by
48              the  facade,  as  per clock milliseconds. A value of 0 indicates
49              that the subordinate channel was not accessed at all, yet.
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51       -created
52              The time the facade was created, as per clock milliseconds.
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54       -user  A free-form value identifying the user of  the  facade  and  its
55              wrapped channel.
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57       Of these only option -user is writable.
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API

60       ::tcl::chan::facade chan
61              This  command  creates  the  facade  channel around the provided
62              channel chan, and returns its handle.
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BUGS, IDEAS, FEEDBACK

65       This document, and the package it describes, will  undoubtedly  contain
66       bugs  and other problems.  Please report such in the category virtchan‐
67       nel  of  the  Tcllib  Trackers  [http://core.tcl.tk/tcllib/reportlist].
68       Please  also  report any ideas for enhancements you may have for either
69       package and/or documentation.
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71       When proposing code changes, please provide unified diffs, i.e the out‐
72       put of diff -u.
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74       Note  further  that  attachments  are  strongly  preferred over inlined
75       patches. Attachments can be made by going  to  the  Edit  form  of  the
76       ticket  immediately  after  its  creation, and then using the left-most
77       button in the secondary navigation bar.
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KEYWORDS

80       concatenation channel, reflected channel, tip 219, virtual channel
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CATEGORY

83       Channels
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86       Copyright (c) 2011 Andreas Kupries <andreas_kupries@users.sourceforge.net>
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91tcllib                                 1                  tcl::chan::facade(n)
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