chromium/extensions/browser/api/storage/value_store_cache.h

// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef EXTENSIONS_BROWSER_API_STORAGE_VALUE_STORE_CACHE_H_
#define EXTENSIONS_BROWSER_API_STORAGE_VALUE_STORE_CACHE_H_

#include "base/functional/callback.h"
#include "base/memory/scoped_refptr.h"
#include "extensions/common/extension_id.h"

namespace value_store {
class ValueStore;
}

namespace extensions {

class Extension;

// Each namespace of the storage API implements this interface.
// Instances are created on the UI thread, but from then on live on the FILE
// thread. At shutdown, ShutdownOnUI() is first invoked on the UI thread, and
// the destructor is invoked soon after on the FILE thread. This gives
// implementations the chance to work with ValueStores on FILE but observe
// events on UI.
// It also means that any methods invoked on UI *before ShutdownOnUI()* can
// safely post other methods to the FILE thread, since the deletion task is only
// posted to FILE after ShutdownOnUI().
class ValueStoreCache { … };

}  // namespace extensions

#endif  // EXTENSIONS_BROWSER_API_STORAGE_VALUE_STORE_CACHE_H_