/// <summary>
/// Initializes a new instance of the <see cref="Stateflow.Workflow.WorkflowEntity"/> class.
/// </summary>
/// <param name="workflowDefinition">Workflow definition.</param>
protected WorkflowEntity(WorkflowDefinition <TIdentifier> workflowDefinition)
{
_workflowEngine = new WorkflowEngine <TIdentifier>(workflowDefinition, null, this);
_workflowEngine.OnStateTransition += WorkflowEngine_OnStateTransition;
}
private void ToStateMachine(WorkflowDefinition <TIdentifier> workflowDefinition, State <TIdentifier> currentState)
{
Enforce.ArgumentNotNull(workflowDefinition, "workflowDefinition");
_workflowDefinition = workflowDefinition;
CurrentState = currentState ?? workflowDefinition.Transitions.First().FromState;
_stateMachine = new StateMachine <State <TIdentifier>, Trigger <TIdentifier> > (() => CurrentState, s => CurrentState = s);
// Get a distinct list of states with a trigger from state configuration
// "State => Trigger => TargetState
var states = workflowDefinition.Transitions.AsQueryable()
.Select(x => x.FromState)
.Distinct()
.Select(x => x)
.ToList();
// Assign triggers to states
states.ForEach(state => {
var triggers = workflowDefinition.Transitions.AsQueryable()
.Where(config => config.FromState == state)
.Select(config => new {
Trigger = config.TriggerBy,
TargetState = config.ToState,
Condition = config.Condition,
IsReentrant = config.IsReentrant
})
.ToList();
var stateConfig = _stateMachine.Configure(state);
triggers.ForEach(trig => {
if (trig.Condition == null)
{
if (trig.IsReentrant)
{
stateConfig.PermitReentry(trig.Trigger);
}
else
{
stateConfig.Permit(trig.Trigger, trig.TargetState);
}
}
else
{
stateConfig.PermitIf(trig.Trigger, trig.TargetState, ConditionalGuard(trig.Condition));
}
});
if (state.SuperState != null)
{
stateConfig.SubstateOf(state.SuperState);
}
if (state.EntryAction != null)
{
stateConfig.OnEntry(t => ExecuteAction(t, state.EntryAction));
}
if (state.ExitAction != null)
{
stateConfig.OnExit(t => ExecuteAction(t, state.ExitAction));
}
});
// Handle exceptions
_stateMachine.OnUnhandledTrigger(OnUnhandledTrigger);
// For all the state transitions
_stateMachine.OnTransitioned(OnTransitionAction);
}
/// <summary>
/// Initializes a new instance of the <see cref="Stateflow.Workflow.WorkflowEngine"/> class.
/// </summary>
/// <param name="workflowDefinition">Workflow definition.</param>
/// <param name="currentState">Current state.</param>
public WorkflowEngine(WorkflowDefinition <TIdentifier> workflowDefinition, State <TIdentifier> currentState) : this(workflowDefinition, currentState, null)
{
}
/// <summary>
/// Initializes a new instance of the <see cref="WorkflowEngine"/> class.
/// </summary>
/// <param name="workflowDefinition">The workflow definition.</param>
/// <param name="currentState">Current state of the workflow. If null, it will be first state found in the workflow definition.</param>
/// <param name="workflowContext">The context that the workflow engine is bound to.</param>
public WorkflowEngine(WorkflowDefinition <TIdentifier> workflowDefinition, State <TIdentifier> currentState, object workflowContext)
{
_workflowContext = workflowContext;
ToStateMachine(workflowDefinition, currentState);
}
/// <summary>
/// Initializes a new instance of the <see cref="Stateflow.Workflow.WorkflowEngine`1"/> class.
/// </summary>
/// <param name="workflowDefinition">Workflow definition.</param>
public WorkflowEngine(WorkflowDefinition <TIdentifier> workflowDefinition) : this(workflowDefinition, null)
{
}
