When to use the pick activity
Hi all
Can you please explain all usecase where to use the pick activity and can we use receive multiples in a BPEL process.
Kind regards
ANU
Well you can use 2 receives, but when you model your processes in jdeveloper with the 2 gets you'll notice you cannot model the way you want
2receive
receive1 (createInstance = YES)
receive2 (CreateInstance = Yes)
This fails, you may have only 1 reveice with createInstance = YES), so basically this means that you could only 'start' your process by calling receive1, and this isn't what you want.
a case where you would use 2 receive and as model
receive1 (createInstance = YES) (operation = startProcess with payload point = 10)
-launch,
-Step 1
-Step 2
-now wait the "appellant" to take action, appellant is calling call your process again, but now he calls it the "receive2", it basically means, on the 'running' instance it triggers your process to continue processing
, so at this point, the receive2 is a sort of waiting, and your process will continue only when the invoke to receive2 is received.
in this case, your willingness to do correlation
receive2 (CreateInstance = no) (operation = continueProcess with the point of payload = 10)
in this case we use correlation on the payload element 'point '.
the bpel framework now knows
1. I start a process on the operation startProcess with correlatino on the value of the element "item", in this case "10".
2. the steps are performed and I get to receive2
3. process waiting overe here
4. the appellant made a new call to your process on the 'continueProcess' operation, we use ' item = 10 "once again the payload on this operation."
5 bpel notice we have an instance of our process (since he is waiting on receive2) and uses the correlation to see if it matches the instance based on the 'item = 10 '.
If Yes, then bpel will continue this instance, it will continue with steps after the receipt of the second.
But in your case, you want to model like this:
receive1 (createInstance = YES)
receive2 (CreateInstance = no)
you want something like this:
receive1 (createInstance = YES) - receive2 (createInstance = YES) (on 1 level)
and in this case, you use a pick activity.
the pick activity will be (createInstance = YES)
and in the collection, you set your branches, onMessage, so something like that.
Pick (name = ItemOperaion, (createInstance = YES))
onMessage (addItem) onMessage (deletItem)
run run step 1 step 1
run run step 2 step 2
providing other measures that are defined/required for operations
Hopefully it's somewhat clear now
Tags: Fusion Middleware
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