بله در این مقاله از سلسه مطالب مربوط به ریفکتورینگ ذکر شده است. هچنین به جای شروط در بعضی مسائل میتوان از اینترفیس ها یا مجموعهها استفاده کرد.
نظرات مطالب
using System; using Stateless; namespace StatelessTests { class Program { static void Main(string[] args) { try { string on = "On", off = "Off"; var space = ' '; var onOffSwitch = new StateMachine<string, char>(initialState: off); onOffSwitch.Configure(state: off).Permit(trigger: space, destinationState: on); onOffSwitch.Configure(state: on).Permit(trigger: space, destinationState: off); Console.WriteLine("Press <space> to toggle the switch. Any other key will raise an error."); while (true) { Console.WriteLine("Switch is in state: " + onOffSwitch.State); var pressed = Console.ReadKey(true).KeyChar; onOffSwitch.Fire(trigger: pressed); } } catch (Exception ex) { Console.WriteLine("Exception: " + ex.Message); Console.WriteLine("Press any key to continue..."); Console.ReadKey(true); } } } }
public class StateMachine<TState, TTrigger>
<statemachine xmlns="http://statelessdesigner.codeplex.com/Schema"> <settings> <itemname>BlogPostStateMachine</itemname> <namespace>StatelessTests</namespace> <class>public</class> </settings> <triggers> <trigger>Save</trigger> <trigger>RequireEdit</trigger> <trigger>Accept</trigger> <trigger>Reject</trigger> </triggers> <states> <state start="yes">Begin</state> <state>InProgress</state> <state>Published</state> <state>Rejected</state> </states> <transitions> <transition trigger="Save" from="Begin" to="InProgress" /> <transition trigger="Accept" from="InProgress" to="Published" /> <transition trigger="Reject" from="InProgress" to="Rejected" /> <transition trigger="Save" from="InProgress" to="InProgress" /> <transition trigger="RequireEdit" from="Published" to="InProgress" /> <transition trigger="RequireEdit" from="Rejected" to="InProgress" /> </transitions> </statemachine>
using Stateless; namespace StatelessTests { public class BlogPostStateMachine { public delegate void UnhandledTriggerDelegate(State state, Trigger trigger); public delegate void EntryExitDelegate(); public delegate bool GuardClauseDelegate(); public enum Trigger { Save, RequireEdit, Accept, Reject, } public enum State { Begin, InProgress, Published, Rejected, } private readonly StateMachine<State, Trigger> stateMachine = null; public EntryExitDelegate OnBeginEntry = null; public EntryExitDelegate OnBeginExit = null; public EntryExitDelegate OnInProgressEntry = null; public EntryExitDelegate OnInProgressExit = null; public EntryExitDelegate OnPublishedEntry = null; public EntryExitDelegate OnPublishedExit = null; public EntryExitDelegate OnRejectedEntry = null; public EntryExitDelegate OnRejectedExit = null; public GuardClauseDelegate GuardClauseFromBeginToInProgressUsingTriggerSave = null; public GuardClauseDelegate GuardClauseFromInProgressToPublishedUsingTriggerAccept = null; public GuardClauseDelegate GuardClauseFromInProgressToRejectedUsingTriggerReject = null; public GuardClauseDelegate GuardClauseFromInProgressToInProgressUsingTriggerSave = null; public GuardClauseDelegate GuardClauseFromPublishedToInProgressUsingTriggerRequireEdit = null; public GuardClauseDelegate GuardClauseFromRejectedToInProgressUsingTriggerRequireEdit = null; public UnhandledTriggerDelegate OnUnhandledTrigger = null; public BlogPost() { stateMachine = new StateMachine<State, Trigger>(State.Begin); stateMachine.Configure(State.Begin) .OnEntry(() => { if (OnBeginEntry != null) OnBeginEntry(); }) .OnExit(() => { if (OnBeginExit != null) OnBeginExit(); }) .PermitIf(Trigger.Save, State.InProgress , () => { if (GuardClauseFromBeginToInProgressUsingTriggerSave != null) return GuardClauseFromBeginToInProgressUsingTriggerSave(); return true; } ) ; stateMachine.Configure(State.InProgress) .OnEntry(() => { if (OnInProgressEntry != null) OnInProgressEntry(); }) .OnExit(() => { if (OnInProgressExit != null) OnInProgressExit(); }) .PermitIf(Trigger.Accept, State.Published , () => { if (GuardClauseFromInProgressToPublishedUsingTriggerAccept != null) return GuardClauseFromInProgressToPublishedUsingTriggerAccept(); return true; } ) .PermitIf(Trigger.Reject, State.Rejected , () => { if (GuardClauseFromInProgressToRejectedUsingTriggerReject != null) return GuardClauseFromInProgressToRejectedUsingTriggerReject(); return true; } ) .PermitReentryIf(Trigger.Save , () => { if (GuardClauseFromInProgressToInProgressUsingTriggerSave != null) return GuardClauseFromInProgressToInProgressUsingTriggerSave(); return true; } ) ; stateMachine.Configure(State.Published) .OnEntry(() => { if (OnPublishedEntry != null) OnPublishedEntry(); }) .OnExit(() => { if (OnPublishedExit != null) OnPublishedExit(); }) .PermitIf(Trigger.RequireEdit, State.InProgress , () => { if (GuardClauseFromPublishedToInProgressUsingTriggerRequireEdit != null) return GuardClauseFromPublishedToInProgressUsingTriggerRequireEdit(); return true; } ) ; stateMachine.Configure(State.Rejected) .OnEntry(() => { if (OnRejectedEntry != null) OnRejectedEntry(); }) .OnExit(() => { if (OnRejectedExit != null) OnRejectedExit(); }) .PermitIf(Trigger.RequireEdit, State.InProgress , () => { if (GuardClauseFromRejectedToInProgressUsingTriggerRequireEdit != null) return GuardClauseFromRejectedToInProgressUsingTriggerRequireEdit(); return true; } ) ; stateMachine.OnUnhandledTrigger((state, trigger) => { if (OnUnhandledTrigger != null) OnUnhandledTrigger(state, trigger); }); } public bool TryFireTrigger(Trigger trigger) { if (!stateMachine.CanFire(trigger)) { return false; } stateMachine.Fire(trigger); return true; } public State GetState { get { return stateMachine.State; } } } }
namespace StatelessTests { public class BlogPostManager { private BlogPostStateMachine _stateMachine; public BlogPostManager() { configureWorkflow(); } private void configureWorkflow() { _stateMachine = new BlogPostStateMachine(); _stateMachine.GuardClauseFromBeginToInProgressUsingTriggerSave = () => { return UserCanPost; }; _stateMachine.OnBeginExit = () => { /* save data + save state + send an email to admin */ }; _stateMachine.GuardClauseFromInProgressToPublishedUsingTriggerAccept = () => { return UserIsAdmin; }; _stateMachine.GuardClauseFromInProgressToRejectedUsingTriggerReject = () => { return UserIsAdmin; }; _stateMachine.GuardClauseFromInProgressToInProgressUsingTriggerSave = () => { return UserHasEditRights; }; _stateMachine.OnInProgressExit = () => { /* save data + save state + send an email to user */ }; _stateMachine.OnPublishedExit = () => { /* save data + save state + send an email to admin */ }; _stateMachine.GuardClauseFromPublishedToInProgressUsingTriggerRequireEdit = () => { return UserHasEditRights; }; _stateMachine.OnRejectedExit = () => { /* save data + save state + send an email to admin */ }; _stateMachine.GuardClauseFromRejectedToInProgressUsingTriggerRequireEdit = () => { return UserHasEditRights; }; } public bool UserIsAdmin { get { return true; // TODO: Evaluate if user is an admin. } } public bool UserCanPost { get { return true; // TODO: Evaluate if user is authenticated } } public bool UserHasEditRights { get { return true; // TODO: Evaluate if user is owner or admin } } // User actions public void Save() { _stateMachine.TryFireTrigger(BlogPostStateMachine.Trigger.Save); } public void RequireEdit() { _stateMachine.TryFireTrigger(BlogPostStateMachine.Trigger.RequireEdit); } // Admin actions public void Accept() { _stateMachine.TryFireTrigger(BlogPostStateMachine.Trigger.Accept); } public void Reject() { _stateMachine.TryFireTrigger(BlogPostStateMachine.Trigger.Reject); } } }