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In a normal event handling scenario, you define multiple events that can be handled, with each one contained within an EventDrivenActivity. These EventDrivenActivity branches are added as children to a single ListenActivity. In this scenario, when one branch receives its event, the other branches are canceled. Once the first event is received and handled, no further processing of activities takes place within the parent ListenActivity. The EventHandlersActivity takes the place of the ListenActivity. It is a container for multiple instances of the EventDrivenActivity. The big difference between the two is that while the ListenActivity cancels the unused branches once an event is received, the EventHandlersActivity doesn t. The EventHandlersActivity allows concurrent processing of events. When one event is received, the activities within the EventDrivenActivity are executed. However, the other event branches are all still alive. They can also receive their events and execute the activities within their branch. The original branch that received its event can even receive it again. What finally completes the parent activity and causes the event branches to end That s a job for the EventHandlingScopeActivity. The EventHandlingScopeActivity can act as the parent of the EventHandlersActivity and permits you to also define a set of mainline activities to execute. With all of this in place, you have an activity that is executing a sequence of activities and also concurrently responding to one or more events. When the mainline sequence of activities completes, all event branches are finally canceled.

The CallExternalMethodActivity is used to synchronously invoke a method that you implement in a local workflow service. This is one of the primary mechanisms used by workflows to communicate with the world beyond the current workflow instance. The method that is invoked must be defined in an interface, and that interface must be decorated with the ExternalDataExchangeAttribute. You identify the method to execute by setting the InterfaceType and MethodName properties of the CallExternalMethodActivity. You don t specify the class that implements the interface. Instead, this activity relies on a local service that you register with the runtime engine during startup. Since you can register only a single class instance for each interface type, the InterfaceType property is sufficient to uniquely identify the local service instance. If the method requires any input or output parameters, they are defined in the ParameterBindings collection of this activity. This collection allows you to bind parameters to properties of the workflow or an activity.

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The text data that we get our hands on is rarely in the format we need. As a contrived example, take the string in our test_numbers.txt file. How do we extract the numbers from a string that contains numbers separated by whitespace and other separators How do we locate the correct position in the string and extract the digit portion only The answer is regular expressions.

When the delay timeout is expired, the Durable Timer Service sends the callback message request back to the Service Hosting Environment, asking it to reactivate the unloaded workflow instance Y for the workflow X With this request, the Durable Timer Service provides all the required data associated with the workflow to be reactivated The Service Hosting Environment reactivates the workflow service host on the machine that initially locked the workflow From this moment on, the workflow continues to run from the last point it was persisted..

The HandleExternalEventActivity is used to receive an event from a local service. Just like the CallExternalMethodActivity, the event must be defined in an interface decorated with the ExternalDataExchangeAttribute and implemented by a registered local service. You identify the event to handle by setting the InterfaceType and EventName properties of the HandleExternalEventActivity. Parameters that are passed with the event populate workflow or activity properties based on the ParameterBindings collection of this activity. Any events that you wish to handle with this activity should derive their EventArgs from ExternalDataEventArgs. Failure to do this prevents you from passing in parameters with the event. The HandleExternalEventActivity is never used by itself. It must be contained within an EventDrivenActivity, and it must be the first child activity. The EventDrivenActivity defines the execution branch when an event is received. The HandleExternalEventActivity is the activity that actually receives the event and starts execution of the branch.

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