HasRunnableWorkflowEvent Class

Represents an event that the SQL Workflow Instance Store raises to notify workflow hosts about the existence of runnable instances in the persistence database.


Namespace:  System.Activities.DurableInstancing
Assembly:  System.Activities (in System.Activities.dll)

public sealed class HasRunnableWorkflowEvent : InstancePersistenceEvent<HasRunnableWorkflowEvent>

The HasRunnableWorkflowEvent type exposes the following members.

Public methodHasRunnableWorkflowEventInitializes an instance of the HasRunnableWorkflowEvent class.

Public propertyNameReturns the XName (namespace combined with name) of the persistence event. (Inherited from InstancePersistenceEvent.)

Public methodEquals(InstancePersistenceEvent)Determines whether the current InstancePersistenceEvent object and the passed InstancePersistenceEvent object are the same. (Inherited from InstancePersistenceEvent.)
Public methodEquals(Object)Determines whether the current InstancePersistenceEvent object and the passed object converted as the InstancePersistenceEvent are the same. (Inherited from InstancePersistenceEvent.)
Public methodGetHashCodeReturns the hash code for the InstancePersistenceEvent instance. (Inherited from InstancePersistenceEvent.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)

An instance is runnable, if it is not in the suspended state or the completed state and satisfies the following conditions:

  • The instance is unlocked and has a pending timer that has expired.

  • The instance is unlocked and its status is Executing.

  • The instance has an invalid lock on it.

An instance store should periodically search for runnable instances that belong to a workflow host that uses the store. It should raise the HasRunnableWorkflowEvent when it finds a runnable instance in the persistence store that matches its workflow host type. If the instance store does not find a runnable instance in the persistence store, it should continue to monitor the persistence store for any runnable instances.

After raising the HasRunnableWorkflowEvent, the instance store should stop monitoring the persistence store for runnable instances until it receives and executes the TryLoadRunnableWorkflowCommand. The monitoring continues only if the TryLoadRunnableWorkflowCommand execution does not return any runnable instances.

When a workflow host receives the HasRunnableWorkflowEvent, it executes the TryLoadRunnableWorkflowCommand against the instance store to load the instance into the memory.

.NET Framework

Supported in: 4.5, 4

.NET Framework Client Profile

Supported in: 4

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
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