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authorRaimo Niskanen <[email protected]>2016-09-16 10:15:22 +0200
committerRaimo Niskanen <[email protected]>2016-09-16 10:50:25 +0200
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-rw-r--r--system/doc/design_principles/statem.xml22
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diff --git a/system/doc/design_principles/statem.xml b/system/doc/design_principles/statem.xml
index 8090016b54..43359829b2 100644
--- a/system/doc/design_principles/statem.xml
+++ b/system/doc/design_principles/statem.xml
@@ -989,7 +989,17 @@ do_unlock() ->
from your state machine to itself.
</p>
<p>
- One example of using self-generated events can be when you have
+ One example for this is to pre-process incoming data, for example
+ decrypting chunks or collecting characters up to a line break.
+ This could be modelled with a separate state machine that sends
+ the pre-processed events to the main state machine, or to decrease
+ overhead the small pre-processing state machine can be implemented
+ in the common state event handling of the main state machine
+ using a few state data variables and then send the pre-processed
+ events as internal events to the main state machine.
+ </p>
+ <p>
+ Another example of using self-generated events can be when you have
a state machine specification that uses state entry actions.
You can code that using a dedicated function
to do the state transition. But if you want that code to be
@@ -1050,7 +1060,15 @@ enter(Tag, State, Data) ->
<seealso marker="#state_entry_events">state entry events</seealso>.
You will have to handle the state entry events in every state.
If you want state entry code in just a few states the previous
- example may be more suitable.
+ example may be more suitable, especially to only send internal
+ events when entering just those few states.
+ </p>
+ <p>
+ You can also in the previous example choose to generate
+ events looking just like the events you get from using
+ <seealso marker="#state_entry_events">state entry events</seealso>.
+ This may be confusing, or practical,
+ depending on your point of view.
</p>
<code type="erl"><![CDATA[
...