/// <summary>
/// Attempts to load the workflow if possible.
/// </summary>
/// <returns></returns>
async Task LoadWorkflow()
{
// might already be loaded somehow
if (workflow == null)
{
// load state from actor
await state.LoadAsync();
// only continue if not already completed
if (state.InstanceState != InstanceState.Completed)
{
// generate owner ID
if (state.InstanceOwnerId == Guid.Empty)
{
state.InstanceOwnerId = Guid.NewGuid();
}
if (state.InstanceId == Guid.Empty)
{
// clear existing data
state.ClearInstanceData();
state.ClearInstanceMetadata();
// create workflow application
await CreateWorkflow(actor.CreateActivity(), actor.CreateActivityInputs() ?? new Dictionary <string, object>());
state.InstanceId = workflow.Id;
await InvokeAndPump(workflow.RunAsync);
await state.SaveAsync();
}
else
{
// create workflow application
await CreateWorkflow(actor.CreateActivity());
await InvokeAndPump(async() => await workflow.LoadAsync(state.InstanceId));
await InvokeAndPump(workflow.RunAsync);
await state.SaveAsync();
}
}
}
}
/// <summary>
/// Handles a <see cref="SaveWorkflowCommand"/>.
/// </summary>
/// <param name="context"></param>
/// <param name="command"></param>
Task <bool> SaveWorkflowCommand(InstancePersistenceContext context, SaveWorkflowCommand command)
{
// save the instance data
state.InstanceState = InstanceState.Initialized;
SaveInstanceData(context.InstanceView.InstanceId, command.InstanceData);
SaveInstanceMetadata(context.InstanceView.InstanceId, command.InstanceMetadataChanges);
state.OnPersisted();
// clear instance data when complete
if (command.CompleteInstance)
{
state.InstanceState = InstanceState.Completed;
state.ClearInstanceData();
state.ClearInstanceMetadata();
state.OnCompleted();
}
return(Task.FromResult(true));
}