Added ImageFileCache, removed TileImageLoader.CreateCache.

Caching/FileDbCache/FileDbCache.cs

@@ -12,7 +12,7 @@ namespace Caching
     /// <summary>
     /// ObjectCache implementation based on EzTools FileDb - http://www.eztools-software.com/tools/filedb/.
     /// </summary>
-    public class FileDbCache : ObjectCache, IDisposable
+    public class FileDbCache : ObjectCache
     {
         private const string keyField = "Key";
         private const string valueField = "Value";
@@ -67,7 +67,7 @@ namespace Caching
             }
 
             this.name = name;
-            path = Path.Combine(directory, name);
+            path = Path.Combine(directory, name.Trim());
 
             if (string.IsNullOrEmpty(Path.GetExtension(path)))
             {
@@ -91,6 +91,11 @@ namespace Caching
             {
                 CreateDatabase();
             }
+
+            if (fileDb.IsOpen)
+            {
+                AppDomain.CurrentDomain.ProcessExit += OnProcessExit;
+            }
         }
 
         public bool AutoFlush
@@ -406,12 +411,45 @@ namespace Caching
             }
         }
 
-        public void Dispose()
+        public void Close()
+        {
+            if (fileDb.IsOpen)
+            {
+                fileDb.Close();
+                AppDomain.CurrentDomain.ProcessExit -= OnProcessExit;
+            }
+        }
+
+        private void OnProcessExit(object sender, EventArgs e)
+        {
+            Close();
+        }
+
+        private void CreateDatabase()
         {
             if (fileDb.IsOpen)
             {
                 fileDb.Close();
             }
+
+            if (File.Exists(path))
+            {
+                File.Delete(path);
+            }
+            else
+            {
+                Directory.CreateDirectory(Path.GetDirectoryName(path));
+            }
+
+            fileDb.Create(path,
+                new Field[]
+            {
+                new Field(keyField, DataTypeEnum.String) { IsPrimaryKey = true },
+                new Field(valueField, DataTypeEnum.Byte) { IsArray = true },
+                new Field(expiresField, DataTypeEnum.DateTime)
+            });
+
+            Trace.TraceInformation("FileDbCache: Created database {0}", path);
         }
 
         private bool RepairDatabase()
@@ -420,47 +458,19 @@ namespace Caching
             {
                 fileDb.Reindex();
             }
-            catch (Exception ex)
+            catch (Exception ex1)
             {
-                Trace.TraceWarning("FileDbCache: FileDb.Reindex() failed: {0}", ex.Message);
-                return CreateDatabase();
-            }
+                Trace.TraceWarning("FileDbCache: FileDb.Reindex() failed: {0}", ex1.Message);
 
-            return true;
-        }
-
-        private bool CreateDatabase()
-        {
-            if (fileDb.IsOpen)
-            {
-                fileDb.Close();
-            }
-
-            try
-            {
-                if (File.Exists(path))
+                try
                 {
-                    File.Delete(path);
+                    CreateDatabase();
                 }
-                else
+                catch (Exception ex2)
                 {
-                    Directory.CreateDirectory(Path.GetDirectoryName(path));
+                    Trace.TraceWarning("FileDbCache: Creating database {0} failed: {1}", path, ex2.Message);
+                    return false;
                 }
-
-                fileDb.Create(path,
-                    new Field[]
-                {
-                    new Field(keyField, DataTypeEnum.String) { IsPrimaryKey = true },
-                    new Field(valueField, DataTypeEnum.Byte) { IsArray = true },
-                    new Field(expiresField, DataTypeEnum.DateTime)
-                });
-
-                Trace.TraceInformation("FileDbCache: Created database {0}", path);
-            }
-            catch (Exception ex)
-            {
-                Trace.TraceWarning("FileDbCache: Creating database failed: {0}", ex.Message);
-                return false;
             }
 
             return true;

Caching/ImageFileCache/ImageFileCache.cs

@@ -0,0 +1,293 @@
+using System;
+using System.Collections.Generic;
+using System.Collections.Specialized;
+using System.Diagnostics;
+using System.IO;
+using System.Linq;
+using System.Runtime.Caching;
+
+namespace Caching
+{
+    /// <summary>
+    /// ObjectCache implementation based on local image files.
+    /// The only valid data type for cached values is a byte[], which contains
+    /// an 8-byte binary UTC time (as created by DateTime.ToBinary), followed
+    /// by a PNG, JPEG, BMP, GIF, TIFF or WMP image buffer.
+    /// </summary>
+    public class ImageFileCache : ObjectCache
+    {
+        private readonly string name;
+        private readonly string directory;
+
+        public ImageFileCache(string name, NameValueCollection config)
+            : this(name, config["directory"])
+        {
+        }
+
+        public ImageFileCache(string name, string directory)
+        {
+            if (string.IsNullOrWhiteSpace(name))
+            {
+                throw new ArgumentException("The parameter name must not be null or empty or only white-space.");
+            }
+
+            if (string.IsNullOrWhiteSpace(directory))
+            {
+                throw new ArgumentException("The parameter directory must not be null or empty or only white-space.");
+            }
+
+            this.name = name;
+            this.directory = Path.Combine(directory, name.Trim());
+            Directory.CreateDirectory(this.directory);
+
+            Trace.TraceInformation("Created ImageFileCache in {0}", this.directory);
+        }
+
+        public override string Name
+        {
+            get { return name; }
+        }
+
+        public override DefaultCacheCapabilities DefaultCacheCapabilities
+        {
+            get { return DefaultCacheCapabilities.InMemoryProvider; }
+        }
+
+        public override object this[string key]
+        {
+            get { return Get(key); }
+            set { Set(key, value, null); }
+        }
+
+        protected override IEnumerator<KeyValuePair<string, object>> GetEnumerator()
+        {
+            throw new NotSupportedException("LocalFileCache does not support the ability to enumerate items.");
+        }
+
+        public override CacheEntryChangeMonitor CreateCacheEntryChangeMonitor(IEnumerable<string> keys, string regionName = null)
+        {
+            throw new NotSupportedException("LocalFileCache does not support the ability to create change monitors.");
+        }
+
+        public override long GetCount(string regionName = null)
+        {
+            throw new NotSupportedException("LocalFileCache does not support the ability to count items.");
+        }
+
+        public override bool Contains(string key, string regionName = null)
+        {
+            if (regionName != null)
+            {
+                throw new NotSupportedException("The parameter regionName must be null.");
+            }
+
+            try
+            {
+                return MemoryCache.Default.Contains(key) || FindFile(GetPath(key)) != null;
+            }
+            catch
+            {
+                return false;
+            }
+        }
+
+        public override object Get(string key, string regionName = null)
+        {
+            if (regionName != null)
+            {
+                throw new NotSupportedException("The parameter regionName must be null.");
+            }
+
+            var value = MemoryCache.Default.Get(key);
+
+            if (value == null)
+            {
+                try
+                {
+                    var path = FindFile(GetPath(key));
+
+                    if (path != null)
+                    {
+                        long creationTime = File.GetLastWriteTimeUtc(path).ToBinary();
+
+                        using (FileStream fileStream = new FileStream(path, FileMode.Open))
+                        using (MemoryStream memoryStream = new MemoryStream((int)(fileStream.Length + 8)))
+                        {
+                            memoryStream.Write(BitConverter.GetBytes(creationTime), 0, 8);
+                            fileStream.CopyTo(memoryStream);
+                            value = memoryStream.GetBuffer();
+                        }
+                    }
+                }
+                catch
+                {
+                }
+            }
+
+            return value;
+        }
+
+        public override CacheItem GetCacheItem(string key, string regionName = null)
+        {
+            var value = Get(key, regionName);
+            return value != null ? new CacheItem(key, value) : null;
+        }
+
+        public override IDictionary<string, object> GetValues(IEnumerable<string> keys, string regionName = null)
+        {
+            if (regionName != null)
+            {
+                throw new NotSupportedException("The parameter regionName must be null.");
+            }
+
+            var values = new Dictionary<string, object>();
+
+            foreach (string key in keys)
+            {
+                values[key] = Get(key);
+            }
+
+            return values;
+        }
+
+        public override void Set(string key, object value, CacheItemPolicy policy, string regionName = null)
+        {
+            if (regionName != null)
+            {
+                throw new NotSupportedException("The parameter regionName must be null.");
+            }
+
+            var buffer = value as byte[];
+
+            if (buffer == null)
+            {
+                throw new NotSupportedException("The parameter value must be a byte[].");
+            }
+
+            MemoryCache.Default.Set(key, buffer, policy);
+
+            var extension = GetFileExtension(buffer);
+
+            if (extension != null)
+            {
+                var path = GetPath(key) + extension;
+                Directory.CreateDirectory(Path.GetDirectoryName(path));
+
+                using (FileStream fileStream = new FileStream(path, FileMode.Create))
+                {
+                    fileStream.Write(buffer, 8, buffer.Length - 8);
+                }
+            }
+        }
+
+        public override void Set(CacheItem item, CacheItemPolicy policy)
+        {
+            Set(item.Key, item.Value, policy, item.RegionName);
+        }
+
+        public override void Set(string key, object value, DateTimeOffset absoluteExpiration, string regionName = null)
+        {
+            Set(key, value, new CacheItemPolicy { AbsoluteExpiration = absoluteExpiration }, regionName);
+        }
+
+        public override object AddOrGetExisting(string key, object value, CacheItemPolicy policy, string regionName = null)
+        {
+            var oldValue = Get(key, regionName);
+            Set(key, value, policy);
+            return oldValue;
+        }
+
+        public override CacheItem AddOrGetExisting(CacheItem item, CacheItemPolicy policy)
+        {
+            var oldItem = GetCacheItem(item.Key, item.RegionName);
+            Set(item, policy);
+            return oldItem;
+        }
+
+        public override object AddOrGetExisting(string key, object value, DateTimeOffset absoluteExpiration, string regionName = null)
+        {
+            return AddOrGetExisting(key, value, new CacheItemPolicy { AbsoluteExpiration = absoluteExpiration }, regionName);
+        }
+
+        public override object Remove(string key, string regionName = null)
+        {
+            var oldValue = Get(key, regionName);
+            MemoryCache.Default.Remove(key);
+
+            try
+            {
+                var path = FindFile(GetPath(key));
+
+                if (path != null)
+                {
+                    File.Delete(path);
+                }
+            }
+            catch
+            {
+            }
+
+            return oldValue;
+        }
+
+        private string GetPath(string key)
+        {
+            return Path.Combine(directory, key);
+        }
+
+        private static string FindFile(string path)
+        {
+            if (!string.IsNullOrEmpty(Path.GetExtension(path)))
+            {
+                return path;
+            }
+
+            string directoryName = Path.GetDirectoryName(path);
+
+            if (Directory.Exists(directoryName))
+            {
+                return Directory.EnumerateFiles(directoryName, Path.GetFileName(path) + ".*").FirstOrDefault();
+            }
+
+            return null;
+        }
+
+        private static readonly Tuple<string, byte[]>[] fileTypes = new Tuple<string, byte[]>[]
+        {
+            new Tuple<string, byte[]>(".png", new byte[] { 0x89, 0x50, 0x4E, 0x47, 0xD, 0xA, 0x1A, 0xA }),
+            new Tuple<string, byte[]>(".jpg", new byte[] { 0xFF, 0xD8, 0xFF, 0xE0, 0, 0x10, 0x4A, 0x46, 0x49, 0x46, 0 }),
+            new Tuple<string, byte[]>(".bmp", new byte[] { 0x42, 0x4D }),
+            new Tuple<string, byte[]>(".gif", new byte[] { 0x47, 0x49, 0x46 }),
+            new Tuple<string, byte[]>(".tif", new byte[] { 0x49, 0x49, 42, 0 }),
+            new Tuple<string, byte[]>(".tif", new byte[] { 0x4D, 0x4D, 0, 42 }),
+            new Tuple<string, byte[]>(".wdp", new byte[] { 0x49, 0x49, 0xBC }),
+        };
+
+        private static string GetFileExtension(byte[] buffer)
+        {
+            string extension = null;
+            DateTime creationTime = DateTime.FromBinary(BitConverter.ToInt64(buffer, 0));
+
+            if (creationTime.Kind == DateTimeKind.Utc && creationTime <= DateTime.UtcNow)
+            {
+                Func<Tuple<string, byte[]>, bool> match =
+                    t =>
+                    {
+                        int i = 0;
+                        if (t.Item2.Length + 8 <= buffer.Length)
+                        {
+                            while (i < t.Item2.Length && t.Item2[i] == buffer[i + 8])
+                            {
+                                i++;
+                            }
+                        }
+                        return i == t.Item2.Length;
+                    };
+
+                extension = fileTypes.Where(match).Select(t => t.Item1).FirstOrDefault();
+            }
+
+            return extension;
+        }
+    }
+}

Caching/ImageFileCache/ImageFileCache.csproj

@@ -0,0 +1,50 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProductVersion>8.0.30703</ProductVersion>
+    <SchemaVersion>2.0</SchemaVersion>
+    <ProjectGuid>{86470440-FEE2-4120-AF5A-3762FB9C536F}</ProjectGuid>
+    <OutputType>Library</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>Caching</RootNamespace>
+    <AssemblyName>ImageFileCache</AssemblyName>
+    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>none</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Runtime.Caching" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="ImageFileCache.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+  <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
+       Other similar extension points exist, see Microsoft.Common.targets.
+  <Target Name="BeforeBuild">
+  </Target>
+  <Target Name="AfterBuild">
+  </Target>
+  -->
+</Project>

Caching/ImageFileCache/Properties/AssemblyInfo.cs

@@ -0,0 +1,36 @@
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following 
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("ImageFileCache")]
+[assembly: AssemblyDescription("ObjectCache implementation based on local image files")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("ImageFileCache")]
+[assembly: AssemblyCopyright("Copyright © 2012 Clemens Fischer")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible 
+// to COM components.  If you need to access a type in this assembly from 
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("0483659a-9743-41a2-9505-9c1a4d9ecc06")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version 
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers 
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]