用状态模式实现状态机工作流
概述
状态机工作流由一组状态组成。一个状态被指示为初始状态。每个状态都可以接收一组特定事件。视事件而定，可以转换到另一个状态。状态机工作流可以有最终状态。当转换到最终状态时，工作流将完成。
场景
针对我上篇博客设计的一个简单的状态机工作流，流程图如下：
我们来设计个用设计模式中的状态模式来设计这个工作流。
设计
先看看它的User Case功能设计：
再看看它的Class diagram设计：
实现
先创建Enums class:
/********************************************************************************
** Class Name: Enums
** Author： spring yang
** Create date： 2013-3-13
** Modify： spring yang
** Modify Date： 2012-3-13
** Summary： Enums class
*********************************************************************************/
using System;
namespace WorkFlowCommon
{
public enum ApplicationState
{
None,
Draft,
InProgress,
Complete,
}
public enum WorkFlowState
{
None,
Common,
Manager,
Done,
Refuse
}
[Flags]
public enum ActivityState
{
Create=1,
Edit=2,
Resbmit=4,
Submit=8,
Revoke=16,
Approve=32,
Reject=64,
Read=128,
None=256
}
}
再创建IActivity Interface:
/********************************************************************************
** Class Name: IActivity
** Author： spring yang
** Create date： 2013-3-13
** Modify： spring yang
** Modify Date： 2012-3-13
** Summary： IActivity interface
*********************************************************************************/
namespace WorkFlowService.IDAL
{
using WorkFlowCommon;
public interface IActivity
{
WorkFlowState Execute(ActivityState activityState);
}
}
再创建IActivityState interface
/********************************************************************************
** Class Name: IActivityState
** Author： spring yang
** Create date： 2013-3-13
** Modify： spring yang
** Modify Date： 2012-3-13
** Summary： IActivityState interface
*********************************************************************************/
namespace WorkFlowService.IDAL
{
using WorkFlowCommon;
public interface IActivityState
{
ActivityState GetActivityState();
}
}
再创建IStateBase interface
/********************************************************************************
** Class Name: IStateBase
** Author： spring yang
** Create date： 2013-3-13
** Modify： spring yang
** Modify Date： 2012-3-13
** Summary： IStateBase interface
*********************************************************************************/
namespace WorkFlowService.IDAL
{
using WorkFlowCommon;
public interface IStateBase : IActivity, IActivityState
{
WorkFlowState GetCurrentState();
}
}
再创建CommonState class
/********************************************************************************
** Class Name: CommonState
** Author： spring yang
** Create date： 2013-3-13
** Modify： spring yang
** Modify Date： 2012-3-13
** Summary： CommonState class
*********************************************************************************/
namespace WorkFlowService.DAL
{
using WorkFlowCommon;
using IDAL;
public class CommonState : IStateBase
{
public WorkFlowState Execute(ActivityState activityState)
{
if (activityState == ActivityState.Submit || activityState == ActivityState.Resbmit)
return WorkFlowState.Manager;
return WorkFlowState.Common;
}
public WorkFlowState GetCurrentState()
{
return WorkFlowState.Common;
}
public ActivityState GetActivityState()
{
return ActivityState.Submit | ActivityState.Read | ActivityState.Revoke | ActivityState.Resbmit;
}
}
}
再创建DoneState Class
/********************************************************************************
** Class Name: DoneState
** Author： spring yang
** Create date： 2013-3-13
** Modify： spring yang
** Modify Date： 2012-3-13
** Summary： DoneState class
*********************************************************************************/
namespace WorkFlowService.DAL
{
using WorkFlowCommon;
using IDAL;
public class DoneState : IStateBase
{
public WorkFlowState Execute(ActivityState activityState)
{
return WorkFlowState.Done;
}
public WorkFlowState GetCurrentState()
{
return WorkFlowState.Done;
}
public ActivityState GetActivityState()
{
return ActivityState.Read;
}
}
}
再创建ManageState class
/********************************************************************************
** Class Name: ManageState
** Author： spring yang
** Create date： 2013-3-13
** Modify： spring yang
** Modify Date： 2012-3-13
** Summary： ManageState class
*********************************************************************************/
namespace WorkFlowService.DAL
{
using WorkFlowCommon;
using IDAL;
public class ManageState : IStateBase
{
public WorkFlowState Execute(ActivityState activityState)
{
if (activityState == ActivityState.Approve)
return WorkFlowState.Done;
if (activityState == ActivityState.Revoke)
return WorkFlowState.Common;
return WorkFlowState.Refuse;
}
public WorkFlowState GetCurrentState()
{
return WorkFlowState.Manager;
}
public ActivityState GetActivityState()
{
return ActivityState.Approve | ActivityState.Reject | ActivityState.Read;
}
}
}
再创建RefuseState class
/********************************************************************************
** Class Name: RefuseState
** Author： spring yang
** Create date： 2013-3-13
** Modify： spring yang
** Modify Date： 2012-3-13
** Summary： RefuseState class
*********************************************************************************/
namespace WorkFlowService.DAL
{
using WorkFlowCommon;
using IDAL;
public class RefuseState : IStateBase
{
public WorkFlowState Execute(ActivityState activityState)
{
return WorkFlowState.Refuse;
}
public WorkFlowState GetCurrentState()
{
return WorkFlowState.Refuse;
}
public ActivityState GetActivityState()
{
return ActivityState.Read;
}
}
}
再创建StateMapping class:
/********************************************************************************
** Class Name: StateMapping
** Author： spring yang
** Create date： 2013-3-13
** Modify： spring yang
** Modify Date： 2012-3-13
** Summary： StateMapping class
*********************************************************************************/
namespace WorkFlowService.Help
{
using System.Collections.Generic;
using DAL;
using IDAL;
public class StateMapping
{
public List<IStateBase> StateBasesList;
private StateMapping()
{
Init();
}
private static StateMapping _instance;
public static StateMapping Instance
{
get
{
if (_instance == null) _instance = new StateMapping();
return _instance;
}
}
private void Init()
{
StateBasesList = new List<IStateBase>
{
new CommonState(),
new ManageState(),
new DoneState(),
new RefuseState()
};
}
}
}
再创建WorkFlowEngine class
/********************************************************************************
** Class Name: WorkFlowEngine
** Author： spring yang
** Create date： 2013-3-13
** Modify： spring yang
** Modify Date： 2012-3-13
** Summary： WorkFlowEngine class
*********************************************************************************/
namespace WorkFlowService.BLL
{
using WorkFlowCommon;
using DAL;
using Help;
using IDAL;
public class WorkFlowEngine
{
private IStateBase GetCurrentWorkFlowStateByWorkFlowState(WorkFlowState workFlowState)
{
foreach (var iStateBase in StateMapping.Instance.StateBasesList)
{
if (iStateBase.GetCurrentState() == workFlowState) return iStateBase;
}
return new CommonState();
}
public WorkFlowState Execute(WorkFlowState workFlowState,ActivityState activityState)
{
return GetCurrentWorkFlowStateByWorkFlowState(workFlowState).Execute(activityState);
}
public ActivityState GetActivityStateByWorkFlowState(WorkFlowState workFlowState)
{
return GetCurrentWorkFlowStateByWorkFlowState(workFlowState).GetActivityState();
}
}
}
最后创建Nunit Test
/********************************************************************************
** Class Name: TestStateWorkFlowTest
** Author： spring yang
** Create date： 2013-3-13
** Modify： spring yang
** Modify Date： 2012-3-13
** Summary： TestStateWorkFlowTest interface
*********************************************************************************/
namespace TestCommunication.WorkflowService
{
using Common;
using NUnit.Framework;
using WFService;
public class TestStateWorkFlowTest : BaseActivity
{
private WorkFlowServiceClient WfServiceInstance
{
get { return new WorkFlowServiceClient(); }
}
[Test]
public void TestNewWorkflow()
{
var appEntity = new AppInfoModel
{
ActivityState = ActivityState.Submit.ToString(),
AppId = "001",
WorkflowName = "TestStateWorkFlow",
UserId = "001",
CurrentState = "Common"
};
var result = WfServiceInstance.NewWorkFlow(appEntity);
Assert.AreEqual(result, "Manage");
}
[Test]
public void TestManageApproveWorkflow()
{
var appEntity = new AppInfoModel
{
ActivityState = ActivityState.Submit.ToString(),
AppId = "002",
WorkflowName = "TestStateWorkFlow",
UserId = "002",
CurrentState = "Common"
};
var result = WfServiceInstance.NewWorkFlow(appEntity);
Assert.AreEqual(result, "Manage");
var manageEntity = new AppInfoModel
{
ActivityState = ActivityState.Approve.ToString(),
AppId = "002",
WorkflowName = "TestStateWorkFlow",
UserId = "003",
CurrentState = "Manage"
};
var manageResult = WfServiceInstance.Execute(manageEntity);
Assert.AreEqual(manageResult, "Done");
}
[Test]
public void TestManageRejectWorkFlow()
{
var appEntity = new AppInfoModel
{
ActivityState = ActivityState.Submit.ToString(),
AppId = "004",
WorkflowName = "TestStateWorkFlow",
UserId = "004",
CurrentState = "Common"
};
var result = WfServiceInstance.NewWorkFlow(appEntity);
Assert.AreEqual(result, "Manage");
var manageEntity = new AppInfoModel
{
ActivityState = ActivityState.Reject.ToString(),
AppId = "004",
WorkflowName = "TestStateWorkFlow",
UserId = "005",
CurrentState = "Manage"
};
var manageResult = WfServiceInstance.Execute(manageEntity);
Assert.AreEqual(manageResult, "Refuse");
}
[Test]
public void TestSaveWorkflow()
{
var appEntity = new AppInfoModel
{
ActivityState = ActivityState.Save.ToString(),
AppId = "006",
WorkflowName = "TestStateWorkFlow",
UserId = "006",
CurrentState = "Common"
};
var result = WfServiceInstance.NewWorkFlow(appEntity);
Assert.AreEqual(result, "Common");
}
[Test]
public void TestRevokeWorkflow()
{
var appEntity = new AppInfoModel
{
ActivityState = ActivityState.Submit.ToString(),
AppId = "007",
WorkflowName = "TestStateWorkFlow",
UserId = "007",
CurrentState = "Common"
};
var result = WfServiceInstance.NewWorkFlow(appEntity);
Assert.AreEqual(result, "Manage");
var commonEntity = new AppInfoModel
{
ActivityState = ActivityState.Revoke.ToString(),
AppId = "007",
WorkflowName = "TestStateWorkFlow",
UserId = "007",
CurrentState = "Common"
};
var revokeResult = WfServiceInstance.Execute(commonEntity);
Assert.AreEqual(revokeResult, "Common");
}
[Test]
public void TestResubmitWorkflow()
{
var appEntity = new AppInfoModel
{
ActivityState = ActivityState.Submit.ToString(),
AppId = "007",
WorkflowName = "TestStateWorkFlow",
UserId = "007",
CurrentState = "Common"
};
var result = WfServiceInstance.NewWorkFlow(appEntity);
Assert.AreEqual(result, "Manage");
var commonEntity = new AppInfoModel
{
ActivityState = ActivityState.Revoke.ToString(),
AppId = "007",
WorkflowName = "TestStateWorkFlow",
UserId = "007",
CurrentState = "Common"
};
var revokeResult = WfServiceInstance.Execute(commonEntity);
Assert.AreEqual(revokeResult, "Common");
var resubmitEntity = new AppInfoModel
{
ActivityState = ActivityState.Resubmit.ToString(),
AppId = "007",
WorkflowName = "TestStateWorkFlow",
UserId = "007",
CurrentState = "Common"
};
var lastResult = WfServiceInstance.Execute(resubmitEntity);
Assert.AreEqual(lastResult, "Manage");
}
}
}
查看运行的结果：
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作者：spring yang
出处：http://www.cnblogs.com/springyangwc/
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