WF4.0 Beta1 自定义持久化PersistenceProvider
文件持久化类
public class myFilePersistenceProvider : PersistenceProvider { string fileName;
public myFilePersistenceProvider(string fileName, Guid id) : base(id) { this.fileName = fileName; }
public override void Delete(object instance, TimeSpan timeout) { File.Delete(fileName); }
public override IAsyncResult BeginDelete(object instance, TimeSpan timeout, AsyncCallback callback, object state) { Delete(instance, timeout);
return myFilePersistenceCompletedAsyncResult.Complete(callback, state); }
public override void EndDelete(IAsyncResult result) { }
public override object Create(object instance, TimeSpan timeout) { using (FileStream stream = new FileStream(fileName, FileMode.Create)) { //System.Runtime.Serialization NetDataContractSerializer serializer = new NetDataContractSerializer(); serializer.WriteObject(stream, instance); }
return null; }
public override IAsyncResult BeginCreate(object instance, TimeSpan timeout, AsyncCallback callback, object state) { Create(instance, timeout); return myFilePersistenceCompletedAsyncResult.Complete(callback, state); }
public override object EndCreate(IAsyncResult result) { return myFilePersistenceCompletedAsyncResult.End(result); }
public override object Load(TimeSpan timeout) { return Load(timeout, true); }
public override object Load(TimeSpan timeout, bool lockInstance) { object result = null; using (FileStream stream = new FileStream(fileName, FileMode.Open)) { NetDataContractSerializer serializer = new NetDataContractSerializer(); result = serializer.ReadObject(stream); }
return result; }
public override IAsyncResult BeginLoad(TimeSpan timeout, AsyncCallback callback, object state) { return BeginLoad(timeout, true, callback, state); }
public override IAsyncResult BeginLoad(TimeSpan timeout, bool lockInstance, AsyncCallback callback, object state) { object instance = Load(timeout, lockInstance);
return myFilePersistenceCompletedAsyncResult.Complete(callback, state, instance); }
public override object EndLoad(IAsyncResult result) { return myFilePersistenceCompletedAsyncResult.End(result); }
public override object Update(object instance, TimeSpan timeout) { using (FileStream stream = new FileStream(fileName, FileMode.Create)) { NetDataContractSerializer serializer = new NetDataContractSerializer(); serializer.WriteObject(stream, instance); }
return null; }
public override IAsyncResult BeginUpdate(object instance, TimeSpan timeout, AsyncCallback callback, object state) { Create(instance, timeout); return myFilePersistenceCompletedAsyncResult.Complete(callback, state); }
public override object EndUpdate(IAsyncResult result) { return myFilePersistenceCompletedAsyncResult.End(result); }
protected override TimeSpan DefaultCloseTimeout { get { return TimeSpan.FromSeconds(30); } }
protected override TimeSpan DefaultOpenTimeout { get { return TimeSpan.FromSeconds(30); } }
protected override void OnAbort() { }
protected override IAsyncResult OnBeginClose(TimeSpan timeout, AsyncCallback callback, object state) { return myFilePersistenceCompletedAsyncResult.Complete(callback, state); }
protected override IAsyncResult OnBeginOpen(TimeSpan timeout, AsyncCallback callback, object state) { return myFilePersistenceCompletedAsyncResult.Complete(callback, state); }
protected override void OnClose(TimeSpan timeout) { }
protected override void OnEndClose(IAsyncResult result) { }
protected override void OnEndOpen(IAsyncResult result) { }
protected override void OnOpen(TimeSpan timeout) { } } |
public class myFilePersistenceCompletedAsyncResult : IAsyncResult { object state; object result;
public myFilePersistenceCompletedAsyncResult(object state) { this.state = state; }
public object AsyncState { get { return this.state; } }
public System.Threading.WaitHandle AsyncWaitHandle { get { return new System.Threading.ManualResetEvent(true); } }
public bool CompletedSynchronously { get { return true; } }
public bool IsCompleted { get { return true; } }
public static IAsyncResult Complete(AsyncCallback callback, object state) { return Complete(callback, state, null); }
public static IAsyncResult Complete(AsyncCallback callback, object state, object returnValue) { myFilePersistenceCompletedAsyncResult result = new myFilePersistenceCompletedAsyncResult(state); result.result = returnValue;
if (callback != null) { callback(result); }
return result; }
public static object End(IAsyncResult result) { myFilePersistenceCompletedAsyncResult thisPtr = (myFilePersistenceCompletedAsyncResult)result;
return thisPtr.result; } } |
功能类
public class wfTools { public static PersistenceProvider createPersistenceProvider(Guid id) { return new myFilePersistenceProvider(id.ToString() + ".txt", id); }
public static WorkflowInstance createWorkflow(WorkflowElement workflow, Guid id) {
WorkflowInstance instance = new WorkflowInstance(workflow, id);
bindingInstanceEvent(instance);
PersistenceProvider pp = createPersistenceProvider(id); instance.Extensions.Add(pp);
return instance; }
public static WorkflowInstance loadWorkflow(WorkflowElement workflow, Guid id) { PersistenceProvider pp = createPersistenceProvider(id); WorkflowInstance instance = WorkflowInstance.Load(workflow, pp); bindingInstanceEvent(instance); return instance; }
static void bindingInstanceEvent(WorkflowInstance instance) {
instance.OnIdle = idel; instance.OnUnloaded = unloaded; instance.OnUnhandledException = unhandledException; instance.OnCompleted = completed; }
static void unloaded() { System.Console.WriteLine("unloaded"); }
static IdleAction idel() { System.Console.WriteLine("idel"); return IdleAction.Unload; }
static void completed(WorkflowCompletedEventArgs e) { System.Console.WriteLine("completed"); }
static void aborted(WorkflowAbortedEventArgs e) { System.Console.WriteLine("aborted", e.Reason.Message); }
static UnhandledExceptionAction unhandledException(WorkflowUnhandledExceptionEventArgs e) { System.Console.WriteLine("unhandledException{0}", e.UnhandledException.Message);
return UnhandledExceptionAction.Abort; }
} |
例子流程
等待触发 | public class myBookmark : NativeActivity { public string bookmarkName { get; set; } protected override void Execute(ActivityExecutionContext context) { context.CreateNamedBookmark(bookmarkName); } } |
流程 |
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使用
第一组代码 | Guid id = new Guid("DB35221A-C901-46F7-8075-E65A8D97FE13"); wfTools.openPersistence();
WorkflowInstance myInstance = wfTools.createWorkflow(new Sequence1(), id); myInstance.Run();
System.Console.Read();
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产生的文件:
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第二组代码 | Guid id = new Guid("DB35221A-C901-46F7-8075-E65A8D97FE13"); wfTools.openPersistence();
WorkflowInstance myInstance = wfTools.loadWorkflow(new Sequence1(), id); myInstance.ResumeBookmark("wxd", null);
System.Console.Read();
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文件已自动删除 |
