On Tue, May 3, 2011 at 10:13 AM, Dario D <darac1...@gmail.com> wrote:
> Thanks Jocke. How would you suggest to resume the the last state before the
> condition was not met? Let's say that the condition was made valid somehow.
> How to resume from the last state?
>
> To continue the previous example:
>
> try {
> exec.go();
> // Execution stops at state2, condition is not met
> // Condition is made valid through some means
> // How to resume?
> } catch (ModelException e) {
> e.printStackTrace();
> }
>
<snip/>
Triggering events is here:
http://commons.apache.org/scxml/guide/core-events.html
The main page for the user guide, which has more, is here:
http://commons.apache.org/scxml/guide.html
If you're using EL, you've have to use the EL syntax for expressions,
so rather than the following from your example ...
<transition target="state3" cond="1 = 2" />
... the syntax will be like below:
<transition target="state3" cond="${1 eq 2}" />
-Rahul
>
> 2011/5/3 jocke eriksson <joakim.eriks...@albatross.com>
>
>> exec.go(); should only be called once. It will start the state
>> machine and it will go through all steps that meets the criteria
>> (event cond).
>>
>> Regards Jocke.
>>
>> 2011/5/3 Dario D <darac1...@gmail.com>:
>> > Hello all,
>> >
>> > I've just started using SCXML and it's great. However, I've hit a brick
>> wall
>> > and I can't seem to figure out something. I have the following XML file:
>> >
>> > <scxml xmlns="http://www.w3.org/2005/07/scxml";
>> > version="1.0"
>> > initialstate="state1">
>> >
>> > <state id="state1">
>> > <onentry>
>> > <log expr="State 1"/>
>> > </onentry>
>> > <transition target="state2" />
>> > </state>
>> >
>> > <state id="state2">
>> > <onentry>
>> > <log expr="State 2"/>
>> > </onentry>
>> > <transition target="state3" cond="1 = 2" />
>> > </state>
>> >
>> > <state id="state3" final="true">
>> > <onentry>
>> > <log expr="State 3"/>
>> > </onentry>
>> > </state>
>> >
>> > </scxml>
>> >
>> > Now, I execute the state machine like this:
>> >
>> > SCXMLExecutor exec = null;
>> > exec = new SCXMLExecutor(new ELEvaluator(), new
>> SimpleDispatcher(),
>> > new SimpleErrorReporter());
>> > Context ctx = new ELContext();
>> > exec.setRootContext(ctx);
>> > exec.setStateMachine(scxml);
>> > exec.setSuperStep(true);
>> > // Start execution
>> > try {
>> > exec.go();
>> > exec.go();
>> > } catch (ModelException e) {
>> > e.printStackTrace();
>> > }
>> >
>> > As you can see I call exec.go() two times. I would expect that in the
>> first
>> > time, the state machine will stop in the "state2" state and remain there,
>> > because condition is not satisfied for going into "state3". However, when
>> > exec.go() is called the second time, it goes from the start. Effectively,
>> it
>> > acts as exec.reset()? Following output is provided:
>> >
>> > 03.05.2011. 14:01:32 org.apache.commons.scxml.model.Log execute
>> > INFO: null: State 1
>> > 03.05.2011. 14:01:32 org.apache.commons.scxml.model.Log execute
>> > INFO: null: State 2
>> > 03.05.2011. 14:01:32 org.apache.commons.scxml.model.Log execute
>> > INFO: null: State 1
>> > 03.05.2011. 14:01:32 org.apache.commons.scxml.model.Log execute
>> > INFO: null: State 2
>> >
>> > Could you explain this behavior?
>> >
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