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https://github.com/ClemensFischer/XAML-Map-Control.git
synced 2026-04-06 23:15:14 +00:00
Added ImageFileCache, removed TileImageLoader.CreateCache.
This commit is contained in:
ClemensF
parent
ae4fb7881a
commit
db1201ad47
12 changed files with 490 additions and 121 deletions
293
Caching/ImageFileCache/ImageFileCache.cs
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293
Caching/ImageFileCache/ImageFileCache.cs
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using System;
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using System.Collections.Generic;
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using System.Collections.Specialized;
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using System.Diagnostics;
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using System.IO;
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using System.Linq;
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using System.Runtime.Caching;
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namespace Caching
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{
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/// <summary>
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/// ObjectCache implementation based on local image files.
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/// The only valid data type for cached values is a byte[], which contains
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/// an 8-byte binary UTC time (as created by DateTime.ToBinary), followed
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/// by a PNG, JPEG, BMP, GIF, TIFF or WMP image buffer.
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/// </summary>
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public class ImageFileCache : ObjectCache
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{
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private readonly string name;
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private readonly string directory;
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public ImageFileCache(string name, NameValueCollection config)
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: this(name, config["directory"])
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{
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}
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public ImageFileCache(string name, string directory)
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{
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if (string.IsNullOrWhiteSpace(name))
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{
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throw new ArgumentException("The parameter name must not be null or empty or only white-space.");
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}
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if (string.IsNullOrWhiteSpace(directory))
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{
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throw new ArgumentException("The parameter directory must not be null or empty or only white-space.");
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}
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this.name = name;
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this.directory = Path.Combine(directory, name.Trim());
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Directory.CreateDirectory(this.directory);
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Trace.TraceInformation("Created ImageFileCache in {0}", this.directory);
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}
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public override string Name
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{
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get { return name; }
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}
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public override DefaultCacheCapabilities DefaultCacheCapabilities
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{
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get { return DefaultCacheCapabilities.InMemoryProvider; }
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}
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public override object this[string key]
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{
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get { return Get(key); }
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set { Set(key, value, null); }
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}
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protected override IEnumerator<KeyValuePair<string, object>> GetEnumerator()
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{
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throw new NotSupportedException("LocalFileCache does not support the ability to enumerate items.");
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}
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public override CacheEntryChangeMonitor CreateCacheEntryChangeMonitor(IEnumerable<string> keys, string regionName = null)
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{
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throw new NotSupportedException("LocalFileCache does not support the ability to create change monitors.");
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}
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public override long GetCount(string regionName = null)
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{
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throw new NotSupportedException("LocalFileCache does not support the ability to count items.");
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}
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public override bool Contains(string key, string regionName = null)
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{
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if (regionName != null)
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{
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throw new NotSupportedException("The parameter regionName must be null.");
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}
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try
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{
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return MemoryCache.Default.Contains(key) || FindFile(GetPath(key)) != null;
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}
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catch
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{
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return false;
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}
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}
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public override object Get(string key, string regionName = null)
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{
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if (regionName != null)
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{
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throw new NotSupportedException("The parameter regionName must be null.");
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}
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var value = MemoryCache.Default.Get(key);
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if (value == null)
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{
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try
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{
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var path = FindFile(GetPath(key));
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if (path != null)
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{
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long creationTime = File.GetLastWriteTimeUtc(path).ToBinary();
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using (FileStream fileStream = new FileStream(path, FileMode.Open))
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using (MemoryStream memoryStream = new MemoryStream((int)(fileStream.Length + 8)))
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{
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memoryStream.Write(BitConverter.GetBytes(creationTime), 0, 8);
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fileStream.CopyTo(memoryStream);
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value = memoryStream.GetBuffer();
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}
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}
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}
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catch
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{
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}
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}
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return value;
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}
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public override CacheItem GetCacheItem(string key, string regionName = null)
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{
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var value = Get(key, regionName);
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return value != null ? new CacheItem(key, value) : null;
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}
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public override IDictionary<string, object> GetValues(IEnumerable<string> keys, string regionName = null)
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{
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if (regionName != null)
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{
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throw new NotSupportedException("The parameter regionName must be null.");
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}
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var values = new Dictionary<string, object>();
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foreach (string key in keys)
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{
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values[key] = Get(key);
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}
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return values;
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}
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public override void Set(string key, object value, CacheItemPolicy policy, string regionName = null)
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{
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if (regionName != null)
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{
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throw new NotSupportedException("The parameter regionName must be null.");
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}
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var buffer = value as byte[];
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if (buffer == null)
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{
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throw new NotSupportedException("The parameter value must be a byte[].");
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}
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MemoryCache.Default.Set(key, buffer, policy);
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var extension = GetFileExtension(buffer);
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if (extension != null)
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{
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var path = GetPath(key) + extension;
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Directory.CreateDirectory(Path.GetDirectoryName(path));
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using (FileStream fileStream = new FileStream(path, FileMode.Create))
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{
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fileStream.Write(buffer, 8, buffer.Length - 8);
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}
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}
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}
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public override void Set(CacheItem item, CacheItemPolicy policy)
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{
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Set(item.Key, item.Value, policy, item.RegionName);
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}
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public override void Set(string key, object value, DateTimeOffset absoluteExpiration, string regionName = null)
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{
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Set(key, value, new CacheItemPolicy { AbsoluteExpiration = absoluteExpiration }, regionName);
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}
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public override object AddOrGetExisting(string key, object value, CacheItemPolicy policy, string regionName = null)
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{
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var oldValue = Get(key, regionName);
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Set(key, value, policy);
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return oldValue;
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}
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public override CacheItem AddOrGetExisting(CacheItem item, CacheItemPolicy policy)
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{
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var oldItem = GetCacheItem(item.Key, item.RegionName);
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Set(item, policy);
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return oldItem;
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}
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public override object AddOrGetExisting(string key, object value, DateTimeOffset absoluteExpiration, string regionName = null)
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{
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return AddOrGetExisting(key, value, new CacheItemPolicy { AbsoluteExpiration = absoluteExpiration }, regionName);
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}
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public override object Remove(string key, string regionName = null)
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{
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var oldValue = Get(key, regionName);
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MemoryCache.Default.Remove(key);
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try
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{
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var path = FindFile(GetPath(key));
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if (path != null)
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{
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File.Delete(path);
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}
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}
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catch
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{
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}
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return oldValue;
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}
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private string GetPath(string key)
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{
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return Path.Combine(directory, key);
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}
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private static string FindFile(string path)
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{
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if (!string.IsNullOrEmpty(Path.GetExtension(path)))
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{
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return path;
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}
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string directoryName = Path.GetDirectoryName(path);
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if (Directory.Exists(directoryName))
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{
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return Directory.EnumerateFiles(directoryName, Path.GetFileName(path) + ".*").FirstOrDefault();
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}
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return null;
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}
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private static readonly Tuple<string, byte[]>[] fileTypes = new Tuple<string, byte[]>[]
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{
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new Tuple<string, byte[]>(".png", new byte[] { 0x89, 0x50, 0x4E, 0x47, 0xD, 0xA, 0x1A, 0xA }),
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new Tuple<string, byte[]>(".jpg", new byte[] { 0xFF, 0xD8, 0xFF, 0xE0, 0, 0x10, 0x4A, 0x46, 0x49, 0x46, 0 }),
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new Tuple<string, byte[]>(".bmp", new byte[] { 0x42, 0x4D }),
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new Tuple<string, byte[]>(".gif", new byte[] { 0x47, 0x49, 0x46 }),
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new Tuple<string, byte[]>(".tif", new byte[] { 0x49, 0x49, 42, 0 }),
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new Tuple<string, byte[]>(".tif", new byte[] { 0x4D, 0x4D, 0, 42 }),
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new Tuple<string, byte[]>(".wdp", new byte[] { 0x49, 0x49, 0xBC }),
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};
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private static string GetFileExtension(byte[] buffer)
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{
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string extension = null;
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DateTime creationTime = DateTime.FromBinary(BitConverter.ToInt64(buffer, 0));
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if (creationTime.Kind == DateTimeKind.Utc && creationTime <= DateTime.UtcNow)
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{
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Func<Tuple<string, byte[]>, bool> match =
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t =>
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{
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int i = 0;
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if (t.Item2.Length + 8 <= buffer.Length)
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{
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while (i < t.Item2.Length && t.Item2[i] == buffer[i + 8])
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{
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i++;
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}
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}
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return i == t.Item2.Length;
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};
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extension = fileTypes.Where(match).Select(t => t.Item1).FirstOrDefault();
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}
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return extension;
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}
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}
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}
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50
Caching/ImageFileCache/ImageFileCache.csproj
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50
Caching/ImageFileCache/ImageFileCache.csproj
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<?xml version="1.0" encoding="utf-8"?>
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<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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<PropertyGroup>
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<Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
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<Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
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<ProductVersion>8.0.30703</ProductVersion>
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<SchemaVersion>2.0</SchemaVersion>
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<ProjectGuid>{86470440-FEE2-4120-AF5A-3762FB9C536F}</ProjectGuid>
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<OutputType>Library</OutputType>
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<AppDesignerFolder>Properties</AppDesignerFolder>
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<RootNamespace>Caching</RootNamespace>
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<AssemblyName>ImageFileCache</AssemblyName>
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<TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
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<FileAlignment>512</FileAlignment>
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</PropertyGroup>
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<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
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<DebugSymbols>true</DebugSymbols>
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<DebugType>full</DebugType>
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<Optimize>false</Optimize>
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<OutputPath>bin\Debug\</OutputPath>
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<DefineConstants>DEBUG;TRACE</DefineConstants>
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<ErrorReport>prompt</ErrorReport>
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<WarningLevel>4</WarningLevel>
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</PropertyGroup>
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<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
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<DebugType>none</DebugType>
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<Optimize>true</Optimize>
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<OutputPath>bin\Release\</OutputPath>
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<DefineConstants>TRACE</DefineConstants>
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<ErrorReport>prompt</ErrorReport>
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<WarningLevel>4</WarningLevel>
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</PropertyGroup>
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<ItemGroup>
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<Reference Include="System" />
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<Reference Include="System.Core" />
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<Reference Include="System.Runtime.Caching" />
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</ItemGroup>
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<ItemGroup>
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<Compile Include="ImageFileCache.cs" />
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<Compile Include="Properties\AssemblyInfo.cs" />
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</ItemGroup>
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<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
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<!-- To modify your build process, add your task inside one of the targets below and uncomment it.
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Other similar extension points exist, see Microsoft.Common.targets.
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<Target Name="BeforeBuild">
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</Target>
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<Target Name="AfterBuild">
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</Target>
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-->
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</Project>
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36
Caching/ImageFileCache/Properties/AssemblyInfo.cs
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36
Caching/ImageFileCache/Properties/AssemblyInfo.cs
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using System.Reflection;
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using System.Runtime.CompilerServices;
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using System.Runtime.InteropServices;
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// General Information about an assembly is controlled through the following
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// set of attributes. Change these attribute values to modify the information
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// associated with an assembly.
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[assembly: AssemblyTitle("ImageFileCache")]
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[assembly: AssemblyDescription("ObjectCache implementation based on local image files")]
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[assembly: AssemblyConfiguration("")]
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[assembly: AssemblyCompany("")]
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[assembly: AssemblyProduct("ImageFileCache")]
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[assembly: AssemblyCopyright("Copyright © 2012 Clemens Fischer")]
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[assembly: AssemblyTrademark("")]
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[assembly: AssemblyCulture("")]
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// Setting ComVisible to false makes the types in this assembly not visible
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// to COM components. If you need to access a type in this assembly from
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// COM, set the ComVisible attribute to true on that type.
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[assembly: ComVisible(false)]
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// The following GUID is for the ID of the typelib if this project is exposed to COM
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[assembly: Guid("0483659a-9743-41a2-9505-9c1a4d9ecc06")]
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// Version information for an assembly consists of the following four values:
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//
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// Major Version
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// Minor Version
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// Build Number
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// Revision
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//
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// You can specify all the values or you can default the Build and Revision Numbers
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// by using the '*' as shown below:
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// [assembly: AssemblyVersion("1.0.*")]
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[assembly: AssemblyVersion("1.0.0.0")]
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[assembly: AssemblyFileVersion("1.0.0.0")]
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