Question

I´m new on JBPM (version 3) and i´m trying to implement (unsuccessfully) a Decision.

I realized that i must do something like this:

Cenario 1:

<decision name="XPTO Decision" expression="#{contextInstance.variables['XPTO Decision']}">
 <transition name="To ActionA" to="ActionA"/>
 <transition name="To ActionB" to="ActionB"/>
 <transition to="ActionA"/>
 </decision>

Or:

Cenario 2:

 <decision name="XPTO Decision" >
 <transition name="To ActionA" to="ActionA"/>
 <transition name="To ActionA" to="ActionA"/>
 <transition to="ActionA">
 <condition expression="#contextInstance.variables['XPTO Decision'] ge 5"/>
 </transition>
 </decision>

Or:

Cenario 3:

 <decision name="XPTO Decision" >
 <handler class="bla.bli.MyDecisionHandler"/>
 <transition name="To ActionA" to="ActionA"/>
 <transition name="To ActionB" to="ActionB"/>
 <transition to="ActionA"/>
 </decision>

I have done something like this, but my decision already goes to the same action (ActionB).

I don´t have sure about how this decision work. Looking for cenario 2 i believe that is something like

“if variable XPTO Decision ge (greates or equals(?)) 5 then Action A
else Action B”.” Is that right?

And… How the cenario 3 works??? How can the handler decide which Action is correct?

Thanks.

Answer 1

I used the following code:

<decision name="XPTODecision">
    <description>
        XPTO decision.
    </description>
    <transition to="XX" name="xx">
        <condition> #{ body.Success} </condition>
    </transition>
    <transition to="YY" name="yy">
        <condition> <![CDATA[#{body.NumberXX <= body.Maximum && theBody.Success}]]></condition>
    </transition>
</decision>

<node name="XX">
...
</node>

<node name="YY">
...
</node>