Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WF / RunTime / AmbientEnvironment.cs / 1305376 / AmbientEnvironment.cs
#region Imports using System; using System.Xml; using System.Collections; using System.Collections.Generic; using System.Collections.Specialized; using System.Threading; using System.Transactions; using System.Reflection; using System.Workflow.ComponentModel; using System.Workflow.Runtime.Hosting; using System.Diagnostics; #endregion namespace System.Workflow.Runtime { #region Class AmbientEnvironment internal abstract class AmbientEnvironment : IDisposable { ////// Indicates that the value of a static field is unique for each thread /// CLR Perf suggests using this attribute over the slot approach. /// [ThreadStatic()] static EnvWrapper threadData; readonly object _prevEnv; readonly int _prevRC; protected AmbientEnvironment(object env) { if (threadData == null) { //Setting TLS for the first time threadData = new EnvWrapper(); } threadData.Push(env, out _prevEnv, out _prevRC); } void IDisposable.Dispose() { Debug.Assert(null != threadData); threadData.Pop(_prevEnv, _prevRC); if (_prevRC == 0) { threadData = null; } } internal static object Retrieve() { if (threadData != null) return threadData.Retrieve(); else return null; } private class EnvWrapper { int _rc; object _currEnv; internal void Push(object env, out object prevEnv, out int prevRc) { Debug.Assert(_rc >= 0); prevEnv = _currEnv; prevRc = _rc; _rc++; _currEnv = env; } internal void Pop(object prevEnv, int prevRC) { Debug.Assert(_rc > 0); _rc--; _currEnv = prevEnv; if (_rc != prevRC) { Debug.Assert(false); // } } internal object Retrieve() { Debug.Assert(_rc > 0); return _currEnv; } } } #endregion #region Class ServiceEnvironment // This class presents the transactional view of a WF instance: // mainly the current batch in transaction, and NOT the runtime view // of currently executing activity. internal sealed class ServiceEnvironment : AmbientEnvironment { internal static readonly Guid debuggerThreadGuid = new Guid("54D747AE-5CC6-4171-95C8-0A8C40443915"); internal ServiceEnvironment(Activity currentActivity) : base(currentActivity) { GC.SuppressFinalize(this); } internal static IWorkBatch WorkBatch { get { Activity currentActivity = ServiceEnvironment.CurrentActivity; if (currentActivity == null) return null; else return (IWorkBatch)currentActivity.GetValue(WorkflowExecutor.TransientBatchProperty); } } internal static Guid WorkflowInstanceId { get { Activity currentActivity = ServiceEnvironment.CurrentActivity; if (currentActivity == null) return Guid.Empty; return ((Guid)ContextActivityUtils.RootContextActivity(currentActivity).GetValue(WorkflowExecutor.WorkflowInstanceIdProperty)); } } internal static WorkflowQueuingService QueuingService { get { Activity currentActivity = ServiceEnvironment.CurrentActivity; // fetch workflow executor IWorkflowCoreRuntime workflowExecutor = null; if(currentActivity != null) workflowExecutor = ContextActivityUtils.RetrieveWorkflowExecutor(currentActivity); while (currentActivity != null) { if (currentActivity == workflowExecutor.CurrentAtomicActivity) { TransactionalProperties transactionalProperties = (TransactionalProperties)currentActivity.GetValue(WorkflowExecutor.TransactionalPropertiesProperty); if (transactionalProperties != null) { if (transactionalProperties.LocalQueuingService != null) { WorkflowQueuingService queuingService = transactionalProperties.LocalQueuingService; return queuingService; // return local queuing service } } } currentActivity = currentActivity.Parent; } return null; } } // DO NOT change this to internal/public // Technically we only want to store the Batch in the TLS, // but because we also want the queueing service and instId, // we are storing the object encapsulating all the info. // The service environment only represents the transactional view: // the current batch; and not the current executing view: // e.g. some caller/caller, send/receive scenarios where // we want the current batch to be the caller's so this activity // does not reflect the executing activity (the callee). private static Activity CurrentActivity { get { object o = AmbientEnvironment.Retrieve(); return o as Activity; } } internal static bool IsInServiceThread(Guid instanceId) { System.Diagnostics.Debug.Assert(instanceId != Guid.Empty, "IsInServiceThread expects valid guid."); if (WorkflowInstanceId == instanceId) return true; return DebuggerThreadMarker.IsInDebuggerThread(); } } #endregion #region Class DebuggerThreadMarker internal class DebuggerThreadMarker : AmbientEnvironment { public DebuggerThreadMarker(): base(new object()) { } internal static bool IsInDebuggerThread() { return AmbientEnvironment.Retrieve() != null; } } #endregion #region Class RuntimeEnvironment internal class RuntimeEnvironment : IDisposable { [ThreadStatic()] static WorkflowRuntime workflowRuntime; public RuntimeEnvironment(WorkflowRuntime runtime) { workflowRuntime = runtime; } internal static WorkflowRuntime CurrentRuntime { get { return RuntimeEnvironment.workflowRuntime; } } void IDisposable.Dispose() { workflowRuntime = null; } } #endregion } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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