question

Here is my example: pull_by_alternate_queue.fsm

8 queues get filled up. A pair of queues, which are conneted by center port connection store a Type. A queue can release items only if the content reaches 10 items. Then the label value called active changes from 1 to 0. This queue releases items, but she doesn't collect any items until she gets empty again. There is always collecting only one queue per Type. The processor, which works to pull items by Type from a list, does this only if the queue and the label "active" has got a value of 0. The Type value is the partition value. If an item of a Type is currently not in the state active = 0 a back order is created and the processor waits until a queue of this type is filled up to 10 items. Then the active field changes dynamically to the value 0 and an item of this Type gets pulled.

Pull requirement to fill queues

/***popup:SpecificLabel*/
/**Specific Item Label & conditions*/
string labelname = /** \nLabel: *//***tag:label*//**/"Type"/**/;
Variant value = /** \nValue: *//***tag:value*//**/current.curType/**/;
if(item.labels[labelname].value == value) { // right Type 
   if(current.active && current.centerObjects[1].active) // queue collects        
	 return current.subnodes.length>=current.centerObjects[1].subnodes.length;
	 return current.active; // queue is empty and is able to collect
  }
return 0; // wrong Type or queue is releasing

Entry and Exit triggers change value of label "active".

Pull from List query in processor for the randomly chosen partition by a dempirical distribution

WHERE isActive = 0

isActive is a dynamic field evaluating the label value "active" of the queue where the item is stored.