//The persistence engine will send a variety of commands to the configured InstanceStore,
//such as CreateWorkflowOwnerCommand, SaveWorkflowCommand, and LoadWorkflowCommand.
//This method is where we will handle those commands
protected override IAsyncResult BeginTryCommand(InstancePersistenceContext context, InstancePersistenceCommand command, TimeSpan timeout, AsyncCallback callback, object state)
{
IDictionary <XName, InstanceValue> data = null;
//The CreateWorkflowOwner command instructs the instance store to create a new instance owner bound to the instanace handle
if (command is CreateWorkflowOwnerCommand)
{
context.BindInstanceOwner(ownerInstanceID, ownerInstanceID);
}
//The SaveWorkflow command instructs the instance store to modify the instance bound to the instance handle or an instance key
else if (command is SaveWorkflowCommand)
{
SaveWorkflowCommand saveCommand = (SaveWorkflowCommand)command;
data = saveCommand.InstanceData;
Save(data);
//_saveWaitHandler.WaitOne(new TimeSpan(0, 0, 1));
}
//The LoadWorkflow command instructs the instance store to lock and load the instance bound to the identifier in the instance handle
else if (command is LoadWorkflowCommand)
{
string fileName = GetFileName(this.ownerInstanceID);
data = LoadInstanceDataFromFile(fileName);
var nonWriteOnly = data.Where(kvp => (kvp.Value.Options & InstanceValueOptions.WriteOnly) != InstanceValueOptions.WriteOnly).ToDictionary(k => k.Key, v => v.Value);
//load the data into the persistence Context
context.LoadedInstance(InstanceState.Initialized, nonWriteOnly, null, null, null);
}
else if (command.Name.LocalName == "CreateWorkflowOwner")
{
//do nothing
}
var result = new CompletedAsyncResult <bool>(true, callback, state);
return(result);
}
protected override bool EndTryCommand(IAsyncResult result)
{
return(CompletedAsyncResult <bool> .End(result));
}
