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| dmitry.volosnykh |
 Posted: Wed Jan 06, 2010 7:55 pm |
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Joined: 06 Jan 2010
Posts: 4
Location: RUSSIA
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(see subject) instead of default in-state-on-event actions?
As far as I understand, gen_fsm, beeing in some state, is just waiting for the next event. I would like to make it do some actions first before entering receive statement.
Thanks in advance. |
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| hao |
| Posted: Fri Jan 08, 2010 3:59 pm |
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Joined: 20 Aug 2007
Posts: 18
Location: Uppsala, Sweden
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As far as I know, you can do some actions in init/1 function. It is called whenever a gen_fsm is started and before it enters initial/first state.
http://www.erlang.org/doc/man/gen_fsm.html#Module:init-1
After init/1 function is called, you can do actions in one state and enter next state which is supposed to receive specific event. |
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| dmitry.volosnykh |
| Posted: Sat Jan 09, 2010 3:27 am |
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Joined: 06 Jan 2010
Posts: 4
Location: RUSSIA
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hao wrote: As far as I know, you can do some actions in init/1 function. It is called whenever a gen_fsm is started and before it enters initial/first state.
http://www.erlang.org/doc/man/gen_fsm.html#Module:init-1
After init/1 function is called, you can do actions in one state and enter next state which is supposed to receive specific event.
I want to associate some actions with each state of FSM. Every time FSM enters specific state, it should perform associated actions. |
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| rvirding |
| Posted: Sun Jan 10, 2010 12:19 am |
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Joined: 30 Aug 2006
Posts: 452
Location: Stockholm, Sweden
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For each state in your FSM you define a function which has the same name as the state. You tell the gen_fsm server which state you are in or to change to the return values of your state functions. When an event occurs (i.e. an event message is received) your state function for that state will be called. It in in your state functions where you do actions depending on the event and state. It is also in these state functions where you determine if there is to be a state transition or not.
This is the basics, there are more functions and alternatives available for other situations. |
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| dmitry.volosnykh |
| Posted: Sun Jan 10, 2010 3:59 am |
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Joined: 06 Jan 2010
Posts: 4
Location: RUSSIA
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rvirding wrote: ...state functions where you do actions depending on the event and state.
I need actions not "on the event and state", but only "in state" what ever event has occured. More over, I'd like them to be triggered every time the state entered. But in standard behaviour of gen_fsm, when it enters some state, it does nothing except for waiting for the next event. And only then actions are carried out. That's not what I want. |
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| rvirding |
| Posted: Mon Jan 18, 2010 12:53 am |
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Joined: 30 Aug 2006
Posts: 452
Location: Stockholm, Sweden
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dmitry.volosnykh wrote: I need actions not "on the event and state", but only "in state" what ever event has occured. More over, I'd like them to be triggered every time the state entered. But in standard behaviour of gen_fsm, when it enters some state, it does nothing except for waiting for the next event. And only then actions are carried out. That's not what I want.
This is easy.
The gen_fsm sits and waits for an event (a message) and when an event occurs the user defined state function for the state it is in is called. It is here that the FSM can decide what to do and which state it should be in. It is also here that when it changes state then any actions which must be done when leaving the old state and entering the new state can be done. |
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| dmitry.volosnykh |
| Posted: Wed Jan 20, 2010 7:13 pm |
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Joined: 06 Jan 2010
Posts: 4
Location: RUSSIA
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rvirding wrote: This is easy.
The gen_fsm sits and waits for an event (a message) and when an event occurs the user defined state function for the state it is in is called. It is here that the FSM can decide what to do and which state it should be in. It is also here that when it changes state then any actions which must be done when leaving the old state and entering the new state can be done.
Thanks. That's really what I was searchin for. |
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| babyjing |
| Posted: Thu Jan 12, 2012 2:44 am |
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| wuji |
| Posted: Thu Aug 23, 2012 6:39 am |
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