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

8       tcl::chan::events - Event support for reflected/virtual channels
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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 tcl::chan::core  ?1?
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17       package require tcl::chan::events  ?1?
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19       ::tcl::chan::events objectName
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21       objectName finalize thechannel
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23       objectName watch thechannel eventmask
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25       objectName allow eventname...
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27       objectName disallow eventname...
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29______________________________________________________________________________
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DESCRIPTION

32       The  tcl::chan::events package provides a TclOO class implementing com‐
33       mon behaviour needed by virtually every reflected  or  virtual  channel
34       supporting  event  driven IO. It is a sub-class of tcl::chan::core, in‐
35       heriting all of its behaviour.
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37       This class expects to be used as either superclass of a concrete  chan‐
38       nel class, or to be mixed into such a class.
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CLASS API

41       ::tcl::chan::events objectName
42              This command creates a new channel event core object with an as‐
43              sociated global Tcl command whose name is objectName. This  com‐
44              mand  may be used to invoke various operations on the object, as
45              described in the section for the Instance API.
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INSTANCE API

48       The API of channel event core instances provides only four methods, two
49       corresponding  to  channel  handler commands (For reference see TIP 219
50       [http:/tip.tcl.tk/219]), and the other two for use  by  sub-classes  to
51       control  event  generation. They former expect to be called from which‐
52       ever object instance the channel event core was made a part of.
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54       objectName finalize thechannel
55              This method  implements  standard  behaviour  for  the  finalize
56              method of channel handlers. It overrides the behaviour inherited
57              from tcl::chan::core and additionally disables any and all event
58              generation before destroying itself.
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60       objectName watch thechannel eventmask
61              This  method  implements standard behaviour for the watch method
62              of channel handlers. Called by the IO system whenever the inter‐
63              est  in  event changes it updates the instance state to activate
64              and/or suppress the generation of the events of (non-)interest.
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66       objectName allow eventname...
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68       objectName disallow eventname...
69              These two methods are exported to sub-classes, so that their in‐
70              stances  can  notify  their event core of the events the channel
71              they implement can (allow) or cannot (disallow)  generate.   To‐
72              gether  with the information about the events requested by Tcl's
73              IO system coming in through the watch method the event  core  is
74              able  to determine which events it should (not) generate and act
75              accordingly.
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BUGS, IDEAS, FEEDBACK

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

93       event management, reflected channel, tip 219, virtual channel
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CATEGORY

96       Channels
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99       Copyright (c) 2009 Andreas Kupries <andreas_kupries@users.sourceforge.net>
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104tcllib                                 1                  tcl::chan::events(n)
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