Implement QuotaTemporaryStorageEvictor.

webkit/quota/quota_temporary_storage_evictor.h

Index: webkit/quota/quota_temporary_storage_evictor.h
diff --git a/webkit/quota/quota_temporary_storage_evictor.h b/webkit/quota/quota_temporary_storage_evictor.h
new file mode 100644
index 0000000000000000000000000000000000000000..ef92795b4f7012423e7b6d82cdc0c9e5f643bdd7
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+++ b/webkit/quota/quota_temporary_storage_evictor.h
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+// 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_QUOTA_QUOTA_TEMPORARY_STORAGE_EVICTOR_H_
+#define WEBKIT_QUOTA_QUOTA_TEMPORARY_STORAGE_EVICTOR_H_
+#pragma once
+
+#include "base/memory/scoped_callback_factory.h"
+#include "base/timer.h"
+#include "webkit/quota/quota_types.h"
+
+class GURL;
+
+namespace base {
+class MessageLoopProxy;
+}
+
+namespace quota {
+
+class QuotaEvictionHandler;
+
+class QuotaTemporaryStorageEvictor {
+ public:
+  QuotaTemporaryStorageEvictor(
+      QuotaEvictionHandler* quota_eviction_handler,
+      int64 interval_ms,
+      scoped_refptr<base::MessageLoopProxy> io_thread);
+  virtual ~QuotaTemporaryStorageEvictor();
+
+  void Start();
+
+  bool repeated_eviction() const { return repeated_eviction_; }
+  void set_repeated_eviction(bool repeated_eviction) {
+    repeated_eviction_ = repeated_eviction;
+  }
+
+ private:
+  friend class QuotaTemporaryStorageEvictorTest;
+
+  void StartEvictionTimerWithDelay(int delay_ms);
+  void ConsiderEviction();
+  void OnGotUsageAndQuotaForEviction(
+      QuotaStatusCode status,
+      int64 usage,
+      int64 quota,
+      int64 available_disk_space);
+  void OnGotLRUOrigin(const GURL& origin);
+  void OnEvictionComplete(QuotaStatusCode status);
+
+  static const double kUsageRatioToStartEviction;
+  static const int64 kDefaultMinAvailableDiskSpaceToStartEviction;
+
+  const int64 min_available_disk_space_to_start_eviction_;
+
+  // Not owned; quota_eviction_handler owns us.
+  QuotaEvictionHandler* quota_eviction_handler_;
+
+  int64 interval_ms_;
+  bool repeated_eviction_;
+  scoped_refptr<base::MessageLoopProxy> io_thread_;
+
+  base::OneShotTimer<QuotaTemporaryStorageEvictor> timer_;
+
+  base::ScopedCallbackFactory<QuotaTemporaryStorageEvictor> callback_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(QuotaTemporaryStorageEvictor);
+};
+
+}  // namespace quota
+
+#endif  // WEBKIT_QUOTA_QUOTA_TEMPORARY_STORAGE_EVICTOR_H_