Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / UIAutomation / Win32Providers / MS / Internal / AutomationProxies / QueueProcessor.cs / 1305600 / QueueProcessor.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // Description: // Class to create a queue on the client context. // WinEventHooks must be processed in the same thread that created them. // A seperate thread is created by the win32 proxy to manage the hooks. // // History: // xx/xx/2002 : micw Created for UI Automation // 07/01/2003 : a-jeanp Adapted for Proxy use //--------------------------------------------------------------------------- using System.Windows.Automation; using System.Windows.Automation.Provider; using System; using System.Threading; using System.Collections; using System.Diagnostics; using System.Runtime.InteropServices; using MS.Win32; using Microsoft.Win32.SafeHandles; namespace MS.Internal.AutomationProxies { class QueueProcessor { // ----------------------------------------------------- // // Constructors // // ----------------------------------------------------- #region Constructors // Usage is to create QueueProcessor object and call StartOnThread internal QueueProcessor(int initCapacity) { _ev = new AutoResetEvent(false); _q = Queue.Synchronized(new Queue(initCapacity)); } // Default constructor. // Create a Queue of jobs with 4 elements internal QueueProcessor() : this(4) { } #endregion // ------------------------------------------------------ // // Internal Methods // // ----------------------------------------------------- #region Internal Methods // Create and start a background thread for this worker window to // run on (background threads will exit if the main and foreground // threads exit) internal void StartOnThread () { ThreadStart threadStart = new ThreadStart(WaitForWork); Thread thread = new Thread(threadStart); thread.IsBackground = true; thread.Start(); } // Post a work item and wait for it to be processed. // The processing of the item is done on the client thread internal bool PostSyncWorkItem (QueueItem workItem) { QueueItem.SyncQueueItem syncItem = new QueueItem.SyncQueueItem (workItem); // save the data _q.Enqueue (syncItem); // Start the processing on a different thread _ev.Set (); // Wait for the processing to be completed return syncItem._ev.WaitOne (2000, false); } #endregion // ------------------------------------------------------ // // Private Methods // // ------------------------------------------------------ #region Private Methods // Infinite loop. Wait for queue items to be processed. private void WaitForWork() { SafeWaitHandle handle = _ev.SafeWaitHandle; NativeMethods.MSG msg = new NativeMethods.MSG(); while (true) { try { // pump any messages while (UnsafeNativeMethods.PeekMessage (ref msg, IntPtr.Zero, 0, 0, NativeMethods.PM_REMOVE)) { if (msg.message == NativeMethods.WM_QUIT) { break; } Misc.DispatchMessage(ref msg); } // do any work items in the queue // It's possible items could be enqueued between when we check for the count // and dequeue but the event is set then and we'll come back into DrainQueue. // (note: don't use a for loop here because as the counter is incremented // Count is decremented and we'll only process half the queue) while (_q.Count > 0) { // pull an item off the queue, process, then clear it QueueItem item = (QueueItem) _q.Dequeue (); item.Process (); } int result = Misc.MsgWaitForMultipleObjects(handle, false, NativeMethods.INFINITE, NativeMethods.QS_ALLINPUT); if (result == NativeMethods.WAIT_FAILED || result == NativeMethods.WAIT_TIMEOUT) { Debug.Assert(false, "MsgWaitForMultipleObjects failed while WaitForWork"); break; } } catch( Exception e ) { if (Misc.IsCriticalException(e)) throw; // Might happen when if the hwnd goes away between the peek and the dispatch } // } } #endregion // ----------------------------------------------------- // // Private Fields // // ------------------------------------------------------ #region Private Fields // A synchronized queue. private Queue _q; // Notifies when new queue items show up. private AutoResetEvent _ev; #endregion } // ----------------------------------------------------- // // QueueItem abstract class // //----------------------------------------------------- #region QueueItem Abstract Class // Abstract class for worker objects queued to the QueueProcessor class abstract class QueueItem { // ----------------------------------------------------- // // Internal Methods // // ------------------------------------------------------ #region Internal Methods // Process an item in a different thread internal abstract void Process (); #endregion // ----------------------------------------------------- // // SyncQueueItem Private Class // // ------------------------------------------------------ #region SyncQueueItem // Not many of these will be created at a time so having the // event in the class is OK and easier than having just one // that manages any [....] method call. internal class SyncQueueItem : QueueItem { // ------------------------------------------------------ // // Constructors // // ----------------------------------------------------- #region Constructors // Queue an item to be processed in a different thread. internal SyncQueueItem (QueueItem qItem) { _ev = new AutoResetEvent (false); _qItem = qItem; } #endregion // ------------------------------------------------------ // // Internal Methods // // ----------------------------------------------------- #region Internal Methods // Process an item from the queue internal override void Process () { // Calls the overloaded version of Process _qItem.Process (); _ev.Set (); } #endregion // ----------------------------------------------------- // // Internal Fields // // ----------------------------------------------------- #region Internal Fields internal AutoResetEvent _ev; #endregion // ------------------------------------------------------ // // Private Fields // // ----------------------------------------------------- #region Private Fields private QueueItem _qItem; #endregion } #endregion // ------------------------------------------------------ // // WinEventItem Private Class // // ------------------------------------------------------ #region WinEventItem // Worker class used to handle WinEvents internal class WinEventItem : QueueItem { // ----------------------------------------------------- // // Constructors // // ------------------------------------------------------ #region Constructors internal WinEventItem (ref WinEventTracker.EventHookParams hp, WinEventTracker.StartStopDelegate ssd) { _hp = hp; _ssd = ssd; } #endregion // ----------------------------------------------------- // // Internal Methods // // ----------------------------------------------------- #region Internal Methods internal override void Process () { _ssd (ref _hp); } #endregion // ----------------------------------------------------- // // Private Methods // // ------------------------------------------------------ #region Private Field // WinEvent Hook parameters private WinEventTracker.EventHookParams _hp; // Delegate to Start/Stop the WinEvent thread on the client context private WinEventTracker.StartStopDelegate _ssd; #endregion } #endregion // ----------------------------------------------------- // // MSAAWinEventItem Private Class // // ------------------------------------------------------ #region MSAAWinEventItem // Worker class used to handle WinEvents internal class MSAAWinEventItem : QueueItem { // ------------------------------------------------------ // // Constructors // // ----------------------------------------------------- #region Constructors internal MSAAWinEventItem(MSAAWinEventWrap.StartStopDelegate ssd) { _ssd = ssd; } #endregion // ------------------------------------------------------ // // Internal Methods // // ----------------------------------------------------- #region Internal Methods internal override void Process() { _ssd(); } #endregion // ----------------------------------------------------- // // Private Methods // // ----------------------------------------------------- #region Private Field // Delegate to Start/Stop the WinEvent thread on the client context private MSAAWinEventWrap.StartStopDelegate _ssd; #endregion } #endregion } #endregion } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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