From 6d40a276c6d9f663e282667080868ad3e5f1ab10 Mon Sep 17 00:00:00 2001
From: Kimura Youichi <kim.upsilon@bucyou.net>
Date: Wed, 10 Apr 2013 09:54:38 +0900
Subject: [PATCH] =?utf8?q?Revert=20"ImageCache=E3=81=AE=E6=8E=92=E4=BB=96?=
 =?utf8?q?=E5=88=B6=E5=BE=A1=E3=82=92=E6=94=B9=E5=96=84"?=
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This reverts commit f3d6eb2556e7739b167f1f4fd79251b1bb660ac8.

LRUCacheDictionaryは参照もスレッドセーフではないため。
---
 OpenTween/ImageCache.cs           | 63 +++++++++++++++------------------------
 OpenTween/Resources/ChangeLog.txt |  1 -
 2 files changed, 24 insertions(+), 40 deletions(-)

diff --git a/OpenTween/ImageCache.cs b/OpenTween/ImageCache.cs
index 90192079..56259ff6 100644
--- a/OpenTween/ImageCache.cs
+++ b/OpenTween/ImageCache.cs
@@ -45,7 +45,7 @@ namespace OpenTween
         /// <summary>
         /// innerDictionary の排他制御のためのロックオブジェクト
         /// </summary>
-        private ReaderWriterLockSlim lockObject = new ReaderWriterLockSlim();
+        private object lockObject = new object();
 
         /// <summary>
         /// オブジェクトが破棄された否か
@@ -54,13 +54,11 @@ namespace OpenTween
 
         public ImageCache()
         {
-            this.lockObject.EnterWriteLock();
-            try
+            lock (this.lockObject)
             {
                 this.innerDictionary = new LRUCacheDictionary<string, Task<MemoryImage>>(trimLimit: 300, autoTrimCount: 100);
 
-                this.innerDictionary.CacheRemoved += (s, e) =>
-                {
+                this.innerDictionary.CacheRemoved += (s, e) => {
                     // まだ参照されている場合もあるのでDisposeはファイナライザ任せ
 
                     this.CacheRemoveCount++;
@@ -68,7 +66,6 @@ namespace OpenTween
 
                 this.cancelTokenSource = new CancellationTokenSource();
             }
-            finally { this.lockObject.ExitWriteLock(); }
         }
 
         /// <summary>
@@ -98,10 +95,12 @@ namespace OpenTween
             return Task.Factory.StartNew(() =>
             {
                 Task<MemoryImage> cachedImageTask = null;
-                this.lockObject.EnterUpgradeableReadLock();
-                try
+                lock (this.lockObject)
                 {
-                    if (!force && this.innerDictionary.ContainsKey(address) && !this.innerDictionary[address].IsFaulted)
+                    if (force)
+                        this.innerDictionary.Remove(address);
+
+                    if (this.innerDictionary.ContainsKey(address) && !this.innerDictionary[address].IsFaulted)
                         cachedImageTask = this.innerDictionary[address];
 
                     if (cachedImageTask != null)
@@ -109,41 +108,34 @@ namespace OpenTween
 
                     cancelToken.ThrowIfCancellationRequested();
 
-                    this.lockObject.EnterWriteLock();
-                    try
+                    using (var client = new OTWebClient() { Timeout = 10000 })
                     {
-                        using (var client = new OTWebClient() { Timeout = 10000 })
+                        var imageTask = client.DownloadDataAsync(new Uri(address), cancelToken).ContinueWith(t =>
                         {
-                            var imageTask = client.DownloadDataAsync(new Uri(address), cancelToken).ContinueWith(t =>
+                            MemoryImage image = null;
+                            if (t.Status == TaskStatus.RanToCompletion)
                             {
-                                MemoryImage image = null;
-                                if (t.Status == TaskStatus.RanToCompletion)
-                                {
-                                    image = MemoryImage.CopyFromBytes(t.Result);
-                                }
+                                image = MemoryImage.CopyFromBytes(t.Result);
+                            }
 
-                                if (t.Exception != null)
-                                    t.Exception.Handle(e => e is WebException);
+                            if (t.Exception != null)
+                                t.Exception.Handle(e => e is WebException);
 
-                                // FIXME: MemoryImage.Dispose() が正しいタイミングで呼ばれるように修正すべき
-                                return image;
-                            }, cancelToken);
+                            // FIXME: MemoryImage.Dispose() が正しいタイミングで呼ばれるように修正すべき
+                            return image;
+                        }, cancelToken);
 
-                            this.innerDictionary[address] = imageTask;
+                        this.innerDictionary[address] = imageTask;
 
-                            return imageTask;
-                        }
+                        return imageTask;
                     }
-                    finally { this.lockObject.ExitWriteLock(); }
                 }
-                finally { this.lockObject.ExitUpgradeableReadLock(); }
             }, cancelToken).Unwrap();
         }
 
         public MemoryImage TryGetFromCache(string address)
         {
-            this.lockObject.EnterReadLock();
-            try
+            lock (this.lockObject)
             {
                 if (!this.innerDictionary.ContainsKey(address))
                     return null;
@@ -154,18 +146,15 @@ namespace OpenTween
 
                 return imageTask.Result;
             }
-            finally { this.lockObject.ExitReadLock(); }
         }
 
         public void CancelAsync()
         {
-            this.lockObject.EnterWriteLock();
-            try
+            lock (this.lockObject)
             {
                 this.cancelTokenSource.Cancel();
                 this.cancelTokenSource = new CancellationTokenSource();
             }
-            finally { this.lockObject.ExitWriteLock(); }
         }
 
         protected virtual void Dispose(bool disposing)
@@ -176,8 +165,7 @@ namespace OpenTween
             {
                 this.CancelAsync();
 
-                this.lockObject.EnterWriteLock();
-                try
+                lock (this.lockObject)
                 {
                     foreach (var item in this.innerDictionary)
                     {
@@ -189,9 +177,6 @@ namespace OpenTween
                     this.innerDictionary.Clear();
                     this.cancelTokenSource.Dispose();
                 }
-                finally { this.lockObject.ExitWriteLock(); }
-
-                this.lockObject.Dispose();
             }
         }
 
diff --git a/OpenTween/Resources/ChangeLog.txt b/OpenTween/Resources/ChangeLog.txt
index 1010823d..594d8b94 100644
--- a/OpenTween/Resources/ChangeLog.txt
+++ b/OpenTween/Resources/ChangeLog.txt
@@ -2,7 +2,6 @@
 
 ==== Ver 1.1.0-beta1(2013/xx/xx)
  * NEW: タブの表示位置を画面上部に変更可能に (thx @aokomoriuta!)
- * CHG: アイコン読み込み処理の速度改善
  * FIX: スペースが含まれているURLをブラウザで開こうとするとURLが分断されて複数のタブが開いてしまう問題を修正 (thx @5px!)
  * FIX: 画面更新時にInvalidOperationExceptionのエラーが発生する不具合を修正
 
-- 
2.11.0