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