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//------------------------------------------------------------------------------
// <copyright file="TimeStampChecker.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
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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