Sharing Data Control between Task Flows

A container associated with task flow that contains the data control is called Data control frame. Data control frame is created for each task flow that's entered results in each task flow having it's own unique instance of data control issues .Data control scope is shared or isolated.Shared mean the DataControlFrame is of calling and isolated is having it's own DataControlFrame.Shared wont work if the calling task flow uses URL to invoke called task flow.

<task-flow-definition id="shared_dc_calling">

    <default-activity>shared_dc_view1</default-activity>

    <data-control-scope>

      <shared/>

    </data-control-scope>

......................

If the task flow is in transaction data-control-option effects transaction options.

Transaction  option	Isolated	shared
requires-existing-transaction	Invalid	-          No transaction exception -          Existing transaction never committed
requires-transaction	Always Begin new transaction	Begin new transaction if one is not already open
new-transaction	Always begin new transaction	Begin new if  one is not open and throw exception if already one there
<default> none	New data control frame is created without an open transaction	Task Flow  uses the calling task flow's transaction for shared data control for any new data controls it creates.task flow does not create or requires a transaction