Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / Compilation / TimeStampChecker.cs / 1 / TimeStampChecker.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.Compilation { using System; using System.Collections; using System.IO; using System.Web; using System.Web.Hosting; using Debug = System.Web.Util.Debug; internal class TimeStampChecker { internal const String CallContextSlotName = "TSC"; private Hashtable _timeStamps = new Hashtable(StringComparer.OrdinalIgnoreCase); private static TimeStampChecker Current { get { TimeStampChecker tsc = (TimeStampChecker)System.Runtime.Remoting.Messaging.CallContext.GetData( CallContextSlotName) as TimeStampChecker; // Create it on demand if (tsc == null) { tsc = new TimeStampChecker(); Debug.Trace("TimeStampChecker", "Creating new TimeStampChecker"); System.Runtime.Remoting.Messaging.CallContext.SetData(CallContextSlotName, tsc); } return tsc; } } internal static void AddFile(string virtualPath, string path) { Current.AddFileInternal(virtualPath, path); } private void AddFileInternal(string virtualPath, string path) { DateTime lastWriteTimeUtc = File.GetLastWriteTimeUtc(path); if (_timeStamps.Contains(virtualPath)) { DateTime storedValue = (DateTime)_timeStamps[virtualPath]; // Already found to have changed before if (storedValue == DateTime.MaxValue) { Debug.Trace("TimeStampChecker", "AddFileInternal: Same time stamp (" + path + ")"); return; } // If it's different, set it to MaxValue as marker of being invalid if (storedValue != lastWriteTimeUtc) { _timeStamps[virtualPath] = DateTime.MaxValue; Debug.Trace("TimeStampChecker", "AddFileInternal: Changed time stamp (" + path + ")"); } } else { // New path: just add it _timeStamps[virtualPath] = lastWriteTimeUtc; Debug.Trace("TimeStampChecker", "AddFileInternal: New path (" + path + ")"); } } internal static bool CheckFilesStillValid(string key, ICollection virtualPaths) { if (virtualPaths == null) return true; return Current.CheckFilesStillValidInternal(key, virtualPaths); } private bool CheckFilesStillValidInternal(string key, ICollection virtualPaths) { Debug.Trace("TimeStampChecker", "CheckFilesStillValidInternal (" + key + ")"); foreach (string virtualPath in virtualPaths) { if (!_timeStamps.Contains(virtualPath)) continue; string path = HostingEnvironment.MapPath(virtualPath); DateTime lastWriteTimeUtc = File.GetLastWriteTimeUtc(path); DateTime storedValue = (DateTime)_timeStamps[virtualPath]; // If it changed, then it's not valid if (lastWriteTimeUtc != storedValue) { Debug.Trace("TimeStampChecker", "CheckFilesStillValidInternal: File (" + path + ") has changed!"); return false; } } Debug.Trace("TimeStampChecker", "CheckFilesStillValidInternal (" + key + ") is still valid"); return true; } } }
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