Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WF / RunTime / WorkflowInstance.cs / 1305376 / WorkflowInstance.cs
// **************************************************************************** // Copyright (C) Microsoft Corporation. All rights reserved. // using System; using System.IO; using System.Threading; using System.Diagnostics; using System.Globalization; using System.Collections; using System.Collections.Generic; using System.Collections.ObjectModel; using System.Workflow.Runtime; using System.Workflow.ComponentModel; using System.Workflow.Runtime.Hosting; namespace System.Workflow.Runtime { ////// Schedule Instance handed over to the client /// public sealed class WorkflowInstance { private WorkflowRuntime _runtime; private Guid _instanceId; private WorkflowExecutor _deadWorkflow; internal WorkflowInstance(Guid instanceId, WorkflowRuntime workflowRuntime) { if (instanceId == Guid.Empty) throw new ArgumentException(String.Format(CultureInfo.CurrentCulture, ExecutionStringManager.CantBeEmptyGuid, "instanceId")); if (workflowRuntime == null) throw new ArgumentNullException("workflowRuntime"); this._instanceId = instanceId; this._runtime = workflowRuntime; } public Guid InstanceId { get { return _instanceId; } } public WorkflowRuntime WorkflowRuntime { get { return _runtime; } } internal WorkflowExecutor DeadWorkflow { set { Debug.Assert(value.WorkflowStatus == WorkflowStatus.Completed || value.WorkflowStatus == WorkflowStatus.Terminated, "Dead workflow is not dead."); _deadWorkflow = value; } } public ReadOnlyCollectionGetWorkflowQueueData() { if (_deadWorkflow != null) return _deadWorkflow.GetWorkflowQueueInfos(); while (true) { WorkflowExecutor executor = _runtime.Load(this); if (executor.IsInstanceValid) { try { return executor.GetWorkflowQueueInfos(); } catch (InvalidOperationException) { if (executor.IsInstanceValid) throw; } } } } public DateTime GetWorkflowNextTimerExpiration() { while (true) { WorkflowExecutor executor = _runtime.Load(this); if (executor.IsInstanceValid) { try { return executor.GetWorkflowNextTimerExpiration(); } catch (InvalidOperationException) { if (executor.IsInstanceValid) throw; } } } } public Activity GetWorkflowDefinition() { while (true) { WorkflowExecutor executor = _runtime.Load(this); if (executor.IsInstanceValid) { try { // Make sure to get the clone here since the // definition is mutable and shared across all // instances. return executor.GetWorkflowDefinitionClone(""); } catch (InvalidOperationException) { if (executor.IsInstanceValid) throw; } } } } public void Load() { using (new WorkflowTraceTransfer(this.InstanceId)) { this._runtime.Load(this); } } public bool TryUnload() { using (new WorkflowTraceTransfer(this.InstanceId)) { WorkflowExecutor executor = _runtime.Load(this); using (executor.ExecutorLock.Enter()) { if (executor.IsInstanceValid) { try { return executor.TryUnload(); } catch (InvalidOperationException) { if (executor.IsInstanceValid) throw; } } } return false; } } public void Suspend(string error) { using (new WorkflowTraceTransfer(this.InstanceId)) { while (true) { WorkflowExecutor executor = _runtime.Load(this); if (executor.IsInstanceValid) { if (executor.WorkflowStatus == WorkflowStatus.Created) throw new InvalidOperationException(ExecutionStringManager.CannotSuspendBeforeStart); try { executor.Suspend(error); return; } catch (InvalidOperationException) { if (executor.IsInstanceValid) throw; } catch (ExecutorLocksHeldException e) { try { e.Handle.WaitOne(); } catch (ObjectDisposedException) { // If an ObjectDisposedException is thrown because // the WaitHandle has already closed, nothing to worry // about. Move on. } } } } } } public void Unload() { using (new WorkflowTraceTransfer(this.InstanceId)) { if (_runtime == null || _runtime.GetService () == null) throw new InvalidOperationException(String.Format(CultureInfo.CurrentCulture, ExecutionStringManager.MissingPersistenceService, this.InstanceId)); while (true) { WorkflowExecutor executor = _runtime.Load(this); if (executor.IsInstanceValid) { try { executor.Unload(); return; } catch (InvalidOperationException) { if (executor.IsInstanceValid) throw; } catch (ExecutorLocksHeldException e) { try { e.Handle.WaitOne(/* maybe should have a timeout here?*/); } catch (ObjectDisposedException) { // If an ObjectDisposedException is thrown because // the WaitHandle has already closed, nothing to worry // about. Move on. } } } } } } public void Resume() { using (new WorkflowTraceTransfer(this.InstanceId)) { while (true) { WorkflowExecutor executor = _runtime.Load(this); if (executor.IsInstanceValid) { try { executor.Resume(); break; } catch (InvalidOperationException) { if (executor.IsInstanceValid) throw; } } } } } internal void ProcessTimers(object ignored) { ProcessTimers(); } internal void ProcessTimers() { using (new WorkflowTraceTransfer(this.InstanceId)) { while (true) { WorkflowExecutor executor = null; try { executor = _runtime.Load(this); } catch (InvalidOperationException) { break; } if (executor != null && executor.IsInstanceValid) { try { executor.DeliverTimerSubscriptions(); break; } catch (InvalidOperationException) { if (executor.IsInstanceValid) throw; } } } } } public void Terminate(string error) { using (new WorkflowTraceTransfer(this.InstanceId)) { while (true) { WorkflowExecutor executor = _runtime.Load(this); if (executor.IsInstanceValid) { try { executor.Terminate(error); break; } catch (InvalidOperationException) { if (executor.IsInstanceValid) throw; } } } } } public void Abort() { using (new WorkflowTraceTransfer(this.InstanceId)) { while (true) { WorkflowExecutor executor = _runtime.Load(this); if (executor.IsInstanceValid) { if (executor.WorkflowStatus == WorkflowStatus.Created) throw new InvalidOperationException(ExecutionStringManager.CannotAbortBeforeStart); try { executor.Abort(); break; } catch (InvalidOperationException) { if (executor.IsInstanceValid) throw; } } } } } public void ReloadTrackingProfiles() { using (new WorkflowTraceTransfer(this.InstanceId)) { while (true) { WorkflowExecutor executor = _runtime.Load(this); if (executor.IsInstanceValid) { try { _runtime.TrackingListenerFactory.ReloadProfiles(executor); break; } catch (InvalidOperationException) { if (executor.IsInstanceValid) throw; } } } } } public void ApplyWorkflowChanges(WorkflowChanges workflowChanges) { using (new WorkflowTraceTransfer(this.InstanceId)) { while (true) { WorkflowExecutor executor = _runtime.Load(this); if (executor.IsInstanceValid) { try { executor.ApplyWorkflowChanges(workflowChanges); break; } catch (InvalidOperationException) { if (executor.IsInstanceValid) throw; } } } } } public void EnqueueItem(IComparable queueName, Object item, IPendingWork pendingWork, Object workItem) { using (new WorkflowTraceTransfer(this.InstanceId)) { while (true) { WorkflowExecutor executor = _runtime.Load(this); try { executor.EnqueueItem(queueName, item, pendingWork, workItem); break; } catch (InvalidOperationException) { if (executor.IsInstanceValid) throw; } } } } public void EnqueueItemOnIdle(IComparable queueName, Object item, IPendingWork pendingWork, Object workItem) { using (new WorkflowTraceTransfer(this.InstanceId)) { while (true) { WorkflowExecutor executor = _runtime.Load(this); if (executor.IsInstanceValid) { try { executor.EnqueueItemOnIdle(queueName, item, pendingWork, workItem); break; } catch (InvalidOperationException) { if (executor.IsInstanceValid) throw; } } } } } internal WorkflowExecutor GetWorkflowResourceUNSAFE() { while (true) { WorkflowExecutor executor = _runtime.Load(this); if (executor.IsInstanceValid) { try { return executor; } catch (InvalidOperationException) { if (executor.IsInstanceValid) throw; } } } } public override bool Equals(Object obj) { WorkflowInstance instance = obj as WorkflowInstance; if (instance == null) return false; return this._instanceId == instance._instanceId; } public override int GetHashCode() { return this._instanceId.GetHashCode(); } public void Start() { using (new WorkflowTraceTransfer(this.InstanceId)) { while (true) { WorkflowExecutor executor = _runtime.Load(this); if (executor.IsInstanceValid) { try { executor.Start(); break; } catch (InvalidOperationException) { if (executor.IsInstanceValid) throw; } } } } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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