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TryLoadRunnableWorkflowCommand Class

Represents the command that a workflow host executes against an instance store to load runnable instances in the persistence store into the memory.

System::Object
  System.Runtime.DurableInstancing::InstancePersistenceCommand
    System.Activities.DurableInstancing::TryLoadRunnableWorkflowCommand

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

public ref class TryLoadRunnableWorkflowCommand sealed : public InstancePersistenceCommand

The TryLoadRunnableWorkflowCommand type exposes the following members.

  NameDescription
Public methodTryLoadRunnableWorkflowCommandInitializes an instance of the TryLoadRunnableWorkflowCommand class.
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  NameDescription
Protected propertyAutomaticallyAcquiringLockIndicates whether the command could attempt to acquire a lock on the instance. (Inherited from InstancePersistenceCommand.)
Protected propertyIsTransactionEnlistmentOptionalReturns a value that indicates whether the persistence provider may choose not to enlist in the ambient transaction (Transaction.Currnet) when executing this command. (Inherited from InstancePersistenceCommand.)
Public propertyNameGets the name of the persistence command. (Inherited from InstancePersistenceCommand.)
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  NameDescription
Public methodEquals(Object)Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodGetHashCodeServes as a hash function for a particular type. (Inherited from Object.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)
Protected methodValidateValidates the command. (Inherited from InstancePersistenceCommand.)
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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 expired 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

.NET Framework Client Profile

Supported in: 4

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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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