public InstanceManager(WorkflowInstance instance, Workflow workflow, StateMachine <State, string> stateMachine, InstanceStatePersistence statePersistance, IRepositoryHelper repositoryHelper)
{
Enforce.ArgumentNotNull(instance, "instance");
Enforce.ArgumentNotNull(workflow, "workflow");
Enforce.ArgumentNotNull(stateMachine, "stateMachine");
Enforce.ArgumentNotNull(statePersistance, "statePersistance");
Enforce.ArgumentNotNull(repositoryHelper, "repositoryHelper");
InstanceId = instance.Id;
StatePersistance = statePersistance;
Workflow = workflow;
RepositoryHelper = repositoryHelper;
StateMachine = stateMachine;
}
public static InstanceManager CreateWorkflowManager(Workflow workflow, IRepositoryHelper repoHelper)
{
Enforce.ArgumentNotNull(workflow, nameof(workflow));
Enforce.ArgumentNotNull(repoHelper, nameof(repoHelper));
var instance = new WorkflowInstance {
WorkflowId = workflow.Id, CurrentStateId = workflow.StartState
};
var repo = repoHelper.GetWorkflowInstanceRepository(repoHelper.GetUnitOfWork());
var id = repo.Insert(instance);
if (!string.IsNullOrWhiteSpace(id))
{
repoHelper.GetUnitOfWork().SaveChanges();
var statePersistance = new InstanceStatePersistence(instance.Id, repoHelper);
var stateMachine = ConfigureStateMachine(workflow, statePersistance, repoHelper);
return(new InstanceManager(instance, workflow, stateMachine, statePersistance, repoHelper));
}
return(null);
}
public static StateMachine <State, string> ConfigureStateMachine(Workflow workflow, InstanceStatePersistence statePersistance, IRepositoryHelper repoHelper)
{
Enforce.ArgumentNotNull(workflow, nameof(workflow));
Enforce.ArgumentNotNull(statePersistance, nameof(statePersistance));
Enforce.ArgumentNotNull(repoHelper, nameof(repoHelper));
var stateMachine = new StateMachine <State, string>(statePersistance.GetCurrentState, statePersistance.SetCurrentState);
// Get a distinct list of states with a trigger from state configuration
// "State => Trigger => TargetState
var stateRepo = repoHelper.GetStateRepository(repoHelper.GetUnitOfWork());
var transitionRepo = new StateTransitionRepository(repoHelper.GetUnitOfWork());
var states = transitionRepo.Where(t => t.WorkflowId == workflow.Id).Select(t => stateRepo.Get(t.StateId)).Distinct().ToList();
//var transitions = transitionRepo.Where(s => s.WorkflowId == workflow.Id).ToList();
// Assigning triggers to states
foreach (var state in states)
{
var transitions = transitionRepo.Where(t => t.StateId == state.Id).Select(t => new { Trigger = t.Trigger, TargetState = stateRepo.Get(t.TargetStateId) }).ToList();
foreach (var tran in transitions)
{
if (tran.TargetState != null)
{
stateMachine.Configure(state).Permit(tran.Trigger, tran.TargetState);
}
}
}
return(stateMachine);
}
