cache updates

Former-commit-id: 568501d80eb07e3dcbfafa603c1e3bc448291e1b

src/ImageProcessor.Web/Caching/DiskCache.cs

@@ -51,7 +51,7 @@ namespace ImageProcessor.Web.Caching
         /// NTFS Folder can handle up to 8000 files in a directory. 
         /// This buffer will help us to ensure that we rarely hit anywhere near that limit.
         /// </remarks>
-        private const int MaxFilesCount = 6000;
+        private const int MaxFilesCount = 6500;
 
         /// <summary>
         /// The regular expression to search strings for extension changes.
@@ -177,8 +177,8 @@ namespace ImageProcessor.Web.Caching
             {
                 lock (SyncRoot)
                 {
-                    DateTime dateTime = File.GetLastWriteTime(imagePath);
-                    File.SetLastWriteTime(cachedImagePath, dateTime);
+                    DateTime dateTime = File.GetLastWriteTimeUtc(imagePath);
+                    File.SetLastWriteTimeUtc(cachedImagePath, dateTime);
                 }
             }
         }
@@ -202,11 +202,11 @@ namespace ImageProcessor.Web.Caching
 
                     Parallel.ForEach(
                         directoryInfos,
-                        dir =>
+                        subDirectoryInfo =>
                         {
                             // Get all the files in the cache ordered by LastAccessTime - oldest first.
-                            List<FileInfo> fileInfos = dir.EnumerateFiles("*", SearchOption.AllDirectories)
-                                .OrderBy(x => x.LastAccessTime).ToList();
+                            List<FileInfo> fileInfos = subDirectoryInfo.EnumerateFiles("*", SearchOption.AllDirectories)
+                                .OrderBy(x => x.LastAccessTimeUtc).ToList();
 
                             int counter = fileInfos.Count;
 
@@ -214,23 +214,24 @@ namespace ImageProcessor.Web.Caching
                                 fileInfos,
                                 fileInfo =>
                                 {
-                                    lock (SyncRoot)
+                                    // Delete the file if we are nearing our limit buffer.
+                                    if (counter >= MaxFilesCount || fileInfo.LastAccessTimeUtc < DateTime.UtcNow.AddDays(-MaxFileCachedDuration))
                                     {
-                                        try
+                                        lock (SyncRoot)
                                         {
-                                            // Delete the file if we are nearing our limit buffer.
-                                            if (counter >= MaxFilesCount && fileInfo.LastAccessTime.ToUniversalTime() < DateTime.UtcNow.AddHours(1)
-                                                || fileInfo.LastAccessTime.ToUniversalTime() < DateTime.UtcNow.AddDays(-MaxFileCachedDuration))
+                                            try
                                             {
                                                 fileInfo.Delete();
                                                 counter -= 1;
                                             }
-                                        }
-                                        catch (IOException)
-                                        {
-                                            // Do Nothing, skip to the next.
+                                            catch (IOException)
+                                            {
+                                                // Do Nothing, skip to the next.                                           
+                                                // TODO: Should we handle this?
+                                            }
                                         }
                                     }
+
                                 });
                         });
                 }

src/ImageProcessor.Web/Helpers/FileCompareLastwritetime.cs

@@ -43,7 +43,7 @@ namespace ImageProcessor.Web.Helpers
         /// <returns>true if the specified objects are equal; otherwise, false.</returns>
         public bool Equals(System.IO.FileInfo f1, System.IO.FileInfo f2)
         {
-            return ToMinute(f1.LastWriteTime.ToUniversalTime()) == ToMinute(f2.LastWriteTime.ToUniversalTime());
+            return ToMinute(f1.LastWriteTimeUtc) == ToMinute(f2.LastWriteTimeUtc);
         }
 
         /// <summary>
@@ -53,7 +53,7 @@ namespace ImageProcessor.Web.Helpers
         /// <returns>A hash code for the specified <see cref="T:System.IO.FileInfo"/>.</returns>
         public int GetHashCode(System.IO.FileInfo fi)
         {
-            return ToMinute(fi.LastWriteTime.ToUniversalTime()).GetHashCode();
+            return ToMinute(fi.LastWriteTimeUtc).GetHashCode();
         }
     }
 }

src/ImageProcessor.Web/Helpers/Class1.cs → src/ImageProcessor.Web/Helpers/ObjectFactory.cs

@@ -17,13 +17,13 @@ namespace ImageProcessor.Web.Helpers
             Type type = ctor.DeclaringType;
             ParameterInfo[] paramsInfo = ctor.GetParameters();
 
-            //create a single param of type object[]
+            // Create a single param of type object[]
             ParameterExpression param = Expression.Parameter(typeof(object[]), "args");
 
             Expression[] argsExp = new Expression[paramsInfo.Length];
 
-            //pick each arg from the params array 
-            //and create a typed expression of them
+            // Pick each arg from the params array 
+            // and create a typed expression for them
             for (int i = 0; i < paramsInfo.Length; i++)
             {
                 Expression index = Expression.Constant(i);
@@ -36,15 +36,15 @@ namespace ImageProcessor.Web.Helpers
                 argsExp[i] = paramCastExp;
             }
 
-            //make a NewExpression that calls the
-            //ctor with the args we just created
+            // Make a NewExpression that calls the
+            // ctor with the args we just created
             NewExpression newExp = Expression.New(ctor, argsExp);
 
-            //create a lambda with the New
-            //Expression as body and our param object[] as arg
+            // Create a lambda with the New
+            // Expression as body and our param object[] as arg
             LambdaExpression lambda = Expression.Lambda(typeof(ObjectActivator<T>), newExp, param);
 
-            //compile it
+            // Compile it
             ObjectActivator<T> compiled = (ObjectActivator<T>)lambda.Compile();
             return compiled;
         }

src/ImageProcessor.Web/HttpModules/ImageProcessingModule.cs

@@ -106,6 +106,16 @@ namespace ImageProcessor.Web.HttpModules
 
             if (ImageUtils.IsValidImageExtension(path) && !string.IsNullOrWhiteSpace(queryString))
             {
+                // Check to see if this is the first run and if so run the cache controller.
+                if (isFirstRun)
+                {
+                    // Trim the cache.
+                    DiskCache.PurgeCachedFolders();
+
+                    // Disable the controller.
+                    isFirstRun = false;
+                }
+
                 string fullPath = string.Format("{0}?{1}", path, queryString);
                 string imageName = Path.GetFileName(path);
                 string cachedPath = DiskCache.GetCachePath(fullPath, imageName);
@@ -117,16 +127,6 @@ namespace ImageProcessor.Web.HttpModules
 
                     if ((exists == false) || (!isRemote && updated))
                     {
-                        // Check to see if this is the first run and if so run the cache controller.
-                        if (isFirstRun)
-                        {
-                            // Trim the cache.
-                            DiskCache.PurgeCachedFolders();
-
-                            // Disable the controller.
-                            isFirstRun = false;
-                        }
-
                         // Process the image.
                         using (ImageFactory imageFactory = new ImageFactory())
                         {
@@ -171,20 +171,22 @@ namespace ImageProcessor.Web.HttpModules
 
                         // Ensure that the LastWriteTime property of the source and cached file match.
                         DiskCache.SetCachedLastWriteTime(path, cachedPath);
-
-                        // If the number of cached imaged hits the maximum allowed for this session then we clear
-                        // the cache again and reset the counter
-                        if (cachedImageCounter >= DiskCache.MaxRunsBeforeCacheClear)
-                        {
-                            DiskCache.PurgeCachedFolders();
-                            cachedImageCounter = 0;
-                        }
                     }
 
                     context.Items[CachedResponseTypeKey] = ImageUtils.GetResponseType(imageName).ToDescription();
 
                     // The cached file is valid so just rewrite the path.
                     context.RewritePath(DiskCache.GetVirtualPath(cachedPath, context.Request), false);
+
+                    // If the number of cached imaged hits the maximum allowed for this session then we clear
+                    // the cache again and reset the counter.
+                    // TODO: There is a potential concurrency issue here but collision probability is very low#
+                    // it would be nice to nail it though.
+                    if (cachedImageCounter >= DiskCache.MaxRunsBeforeCacheClear)
+                    {
+                        DiskCache.PurgeCachedFolders();
+                        cachedImageCounter = 0;
+                    }
                 }
             }
         }

src/ImageProcessor.Web/ImageFactoryExtensions.cs

@@ -19,7 +19,7 @@ namespace ImageProcessor.Web
     /// </summary>
     public static class ImageFactoryExtensions
     {
-        private static readonly object SyncLock = new object();
+        private static readonly object SyncRoot = new object();
 
         /// <summary>
         /// Auto processes image files based on any querystring parameters added to the image path.
@@ -36,7 +36,7 @@ public static ImageFactory AutoProcess(this ImageFactory factory)
     if (factory.ShouldProcess)
     {
         // TODO: This is going to be a bottleneck for speed. Find a faster way.
-        lock (SyncLock)
+        lock (SyncRoot)
         {
             // Get a list of all graphics processors that have parsed and matched the querystring.
             List<IGraphicsProcessor> list =

src/ImageProcessor.Web/ImageProcessor.Web.csproj

@@ -56,8 +56,6 @@
     <Compile Include="Config\ImageProcessingSection.cs" />
     <Compile Include="Config\ImageProcessorConfig.cs" />
     <Compile Include="Config\ImageSecuritySection.cs" />
-    <Compile Include="Helpers\Class1.cs" />
-    <Compile Include="Helpers\ProcessorFactory.cs" />
     <Compile Include="Helpers\FileCompareLastwritetime.cs" />
     <Compile Include="Helpers\RemoteFile.cs" />
     <Compile Include="HttpModules\ImageProcessingModule.cs" />