Index: webkit/glue/media/defer_strategy.h |
diff --git a/webkit/glue/media/defer_strategy.h b/webkit/glue/media/defer_strategy.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..e9db28b4ccc2e3cbfc938470ce4a849a4bd09168 |
--- /dev/null |
+++ b/webkit/glue/media/defer_strategy.h |
@@ -0,0 +1,64 @@ |
+// Copyright (c) 2011 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+#ifndef WEBKIT_GLUE_DEFER_STRATEGY_H_ |
+#define WEBKIT_GLUE_DEFER_STRATEGY_H_ |
+ |
+#include "base/singleton.h" |
+ |
+namespace webkit_glue { |
+ |
+class BufferedResourceLoader; |
+ |
+class DeferStrategy { |
+ public: |
+ // Checks to see if loader should defer loading based on its state. |
+ // Defers loader if needed. |
+ // Returns true deferring was enabled, false otherwise. |
+ virtual bool EnableDeferIfNeeded(BufferedResourceLoader* loader) const = 0; |
+ |
+ // Checks to see if loader should stop deferring based on its state. |
+ // Disables deferring if needed. |
+ // Returns true deferring was disabled, false otherwise. |
+ virtual bool DisableDeferIfNeeded(BufferedResourceLoader* loader) const = 0; |
+ |
+ // Returns true if this strategy will ever allow resource deferring. This is |
+ // used by BufferedResourceLoader to determine how much data should be |
+ // stored in its in-memory buffer. |
+ virtual bool AllowsDeferring() const { return true; }; |
+ |
+ // Toggles the defer settings for the resource loader. |
+ // Returns true if defer setting was toggled, false otherwise. |
+ static bool ToggleDefer(BufferedResourceLoader* loader); |
+}; |
+ |
+// Never defer resource loading; keep buffering until all data has been |
+// received. |
+class NeverDeferStrategy : public DeferStrategy { |
+ public: |
+ static NeverDeferStrategy* GetInstance(); |
+ virtual bool EnableDeferIfNeeded(BufferedResourceLoader* loader) const; |
+ virtual bool DisableDeferIfNeeded(BufferedResourceLoader* loader) const; |
+ virtual bool AllowsDeferring() const { return false; }; |
+}; |
+ |
+// Buffer up until a threshold determined by the resource loader. |
+class ThresholdDeferStrategy : public DeferStrategy { |
+ public: |
+ static ThresholdDeferStrategy* GetInstance(); |
+ virtual bool EnableDeferIfNeeded(BufferedResourceLoader* loader) const; |
+ virtual bool DisableDeferIfNeeded(BufferedResourceLoader* loader) const; |
+}; |
+ |
+// Buffer only what is requested by the read requests on the loader. |
+class ReadThenDeferStrategy : public DeferStrategy { |
+ public: |
+ static ReadThenDeferStrategy* GetInstance(); |
+ virtual bool EnableDeferIfNeeded(BufferedResourceLoader* loader) const; |
+ virtual bool DisableDeferIfNeeded(BufferedResourceLoader* loader) const; |
+}; |
+ |
+}; |
+ |
+#endif // WEBKIT_GLUE_DEFER_STRATEGY_H_ |