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authorGabor Liptak <[email protected]>2011-01-29 15:52:39 -0500
committerNiclas Axelsson <[email protected]>2011-02-25 17:05:43 +0100
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Update Handling Other Messages section in gen_server, gen_fsm, gen_events overviews
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diff --git a/system/doc/design_principles/events.xml b/system/doc/design_principles/events.xml
index 5579f1e459..fab9e8305e 100644
--- a/system/doc/design_principles/events.xml
+++ b/system/doc/design_principles/events.xml
@@ -217,5 +217,22 @@ terminate(_Args, Fd) ->
ok</pre>
</section>
</section>
+ <section>
+ <title>Handling Other Messages</title>
+ <p>If the gen_event should be able to receive other messages than
+ events, the callback function <c>handle_info(Info, StateName, StateData)</c>
+ must be implemented to handle them. Examples of
+ other messages are exit messages, if the gen_event is linked to
+ other processes (than the supervisor) and trapping exit signals.</p>
+ <code type="none">
+handle_info({'EXIT', Pid, Reason}, State) ->
+ ..code to handle exits here..
+ {ok, NewState}.</code>
+ <p>The code_change method also has to be implemented.</p>
+ <code type="none">
+code_change(OldVsn, State, Extra) ->
+ ..code to convert state (and more) during code change
+ {ok, NewState}</code>
+ </section>
</chapter>