Windows Workflow Foundation 3


OwnershipTimeoutSeconds


 
Hi,
Plese, could you tell me what exactly means this attribute.
 
Regards:
Jesús
InstanceOwnershipDuration - This parameter is only useful if you have more than one runtimehost sharing the same persistence service and db. It is used to set an interval during which the instance can be locked by one of the host so that if another host tries to load the same instance it will get an exception.
LoadingInterval: This parameter defines how often do you want persistence service to pull timers from the db. If it set to 5 sec, the service will pull db for expired timers every 5 sec. If you have a delay shape in your workflow with the delay set to less than 5 sec, your workflow won't be loaded right after the timer expires since the loading inverval is greater than your delay interval.
you can find a sample demonstrating these concepts here
Ownership timeout is used when multiple workflow runtimes share the same persistance store.  This attribute corresponds to how long a particular workflow runtime can hold a lock on an instance.  When this timeout is reached, that instance is released and any other runtime can pick it up and execute it.
Here's a little more detail:
Whenever a workflow runtime picks up an instance from the workflow store an executes it, it locks that instance in the database so that no other runtime can touch it.  When the runtime persists the workflow instance back (the instance is idle), it releases this lock so that other runtimes are free to pick it up if needed.
In some scenarios, a workflow runtime on one machine may place a lock on a particular instance and execute it, but that machine may fail/shutdown before it is able to persist back and release that lock.  This would cause that instance to remain locked indefinitely in the workflow store and no other runtime (different machines) would be able to touch it.  This is where the instance ownership timeout is useful - once the timeout is reached, this lock is automatically released and another runtime can attempt to complete this instance.
-Angel
InstanceOwnershipDuration - This parameter is only useful if you have more than one runtimehost sharing the same persistence service and db. It is used to set an interval during which the instance can be locked by one of the host so that if another host tries to load the same instance it will get an exception.
LoadingInterval: This parameter defines how often do you want persistence service to pull timers from the db. If it set to 5 sec, the service will pull db for expired timers every 5 sec. If you have a delay shape in your workflow with the delay set to less than 5 sec, your workflow won't be loaded right after the timer expires since the loading inverval is greater than your delay interval.
you can find a sample demonstrating these concepts here
Ownership timeout is used when multiple workflow runtimes share the same persistance store.  This attribute corresponds to how long a particular workflow runtime can hold a lock on an instance.  When this timeout is reached, that instance is released and any other runtime can pick it up and execute it.
Here's a little more detail:
Whenever a workflow runtime picks up an instance from the workflow store an executes it, it locks that instance in the database so that no other runtime can touch it.  When the runtime persists the workflow instance back (the instance is idle), it releases this lock so that other runtimes are free to pick it up if needed.
In some scenarios, a workflow runtime on one machine may place a lock on a particular instance and execute it, but that machine may fail/shutdown before it is able to persist back and release that lock.  This would cause that instance to remain locked indefinitely in the workflow store and no other runtime (different machines) would be able to touch it.  This is where the instance ownership timeout is useful - once the timeout is reached, this lock is automatically released and another runtime can attempt to complete this instance.
-Angel

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