Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WF / RunTime / WorkflowStateRollbackService.cs / 1305376 / WorkflowStateRollbackService.cs
using System; using System.Collections.Generic; using System.Collections; using System.Diagnostics; using System.Reflection; using System.Text; using System.IO; using System.IO.Compression; using System.Transactions; using System.Workflow.ComponentModel; namespace System.Workflow.Runtime { internal sealed class WorkflowStateRollbackService { WorkflowExecutor workflowExecutor; // cache the revert back data MemoryStream clonedInstanceStateStream; Activity workflowDefinition = null; bool isInstanceStateRevertRequested = false; // revert back notification info string activityQualifiedName; int activityContextId; EventArgs callbackData; EventHandlercallbackHandler; bool suspendOnRevert; string suspendOnRevertInfo; Hashtable completedContextActivities = new Hashtable(); public WorkflowStateRollbackService(WorkflowExecutor workflowExecutor) { this.workflowExecutor = workflowExecutor; } internal bool IsInstanceStateRevertRequested { get { return this.isInstanceStateRevertRequested; } } internal void CheckpointInstanceState() { Debug.Assert(this.workflowExecutor.InstanceId != null, "instance id null at checkpoint time"); // serialize the instance state this.clonedInstanceStateStream = new MemoryStream(10240); this.workflowExecutor.RootActivity.Save(this.clonedInstanceStateStream); this.workflowDefinition = this.workflowExecutor.WorkflowDefinition; this.completedContextActivities = (Hashtable)this.workflowExecutor.CompletedContextActivities.Clone(); this.clonedInstanceStateStream.Position = 0; } internal void RequestRevertToCheckpointState(Activity currentActivity, EventHandler callbackHandler, EventArgs callbackData, bool suspendOnRevert, string suspendInfo) { if (this.clonedInstanceStateStream == null) throw new InvalidOperationException(ExecutionStringManager.InvalidRevertRequest); // cache the after revert information this.activityContextId = ContextActivityUtils.ContextId(ContextActivityUtils.ContextActivity(currentActivity)); this.activityQualifiedName = currentActivity.QualifiedName; this.callbackData = callbackData; this.callbackHandler = callbackHandler; this.suspendOnRevert = suspendOnRevert; this.suspendOnRevertInfo = suspendInfo; // ask scheduler to stop this.isInstanceStateRevertRequested = true; this.workflowExecutor.Scheduler.CanRun = false; } internal void DisposeCheckpointState() { this.clonedInstanceStateStream = null; } internal void RevertToCheckpointState() { Debug.Assert(this.clonedInstanceStateStream != null, "cloned instance-state stream null at restore time"); // deserialize only on first access Activity clonedRootActivity = null; this.clonedInstanceStateStream.Position = 0; using (RuntimeEnvironment runtimeEnv = new RuntimeEnvironment(this.workflowExecutor.WorkflowRuntime)) { clonedRootActivity = Activity.Load(this.clonedInstanceStateStream, (Activity)this.workflowDefinition); } Debug.Assert(clonedRootActivity != null); // // Set the trackingListenerBroker before initializing the executor so the tracking // runtime gets a reference to the correct object clonedRootActivity.SetValue(WorkflowExecutor.TrackingListenerBrokerProperty, workflowExecutor.RootActivity.GetValue(WorkflowExecutor.TrackingListenerBrokerProperty)); // create the new workflowExecutor WorkflowExecutor newWorkflowExecutor = new WorkflowExecutor(Guid.Empty); // use a dummy guid while swapping executors newWorkflowExecutor.Initialize(clonedRootActivity, this.workflowExecutor.WorkflowRuntime, this.workflowExecutor); // enqueue the activity notifier Activity activityContext = newWorkflowExecutor.GetContextActivityForId(this.activityContextId); Activity activity = activityContext.GetActivityByName(this.activityQualifiedName); using (new ServiceEnvironment(activity)) { using (newWorkflowExecutor.SetCurrentActivity(activity)) { using (ActivityExecutionContext executionContext = new ActivityExecutionContext(activity)) executionContext.Invoke (this.callbackHandler, this.callbackData); } } // // Push the batch item ordering id to the new instance newWorkflowExecutor.BatchCollection.WorkItemOrderId = this.workflowExecutor.BatchCollection.WorkItemOrderId; // replace pending batch items foreach (KeyValuePair
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