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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_PERFORMANCE_MANAGER_PUBLIC_PERSISTENCE_SITE_DATA_SITE_DATA_READER_H_
#define COMPONENTS_PERFORMANCE_MANAGER_PUBLIC_PERSISTENCE_SITE_DATA_SITE_DATA_READER_H_
#include "base/functional/callback_forward.h"
#include "base/gtest_prod_util.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "components/performance_manager/public/persistence/site_data/feature_usage.h"
namespace performance_manager {
FORWARD_DECLARE_TEST(SiteDataReaderTest,
FreeingReaderDoesntCauseWriteOperation);
namespace internal {
class SiteDataImpl;
} // namespace internal
class SiteDataReader {
public:
SiteDataReader();
virtual ~SiteDataReader();
// Accessors for the site characteristics usage.
virtual SiteFeatureUsage UpdatesFaviconInBackground() const = 0;
virtual SiteFeatureUsage UpdatesTitleInBackground() const = 0;
virtual SiteFeatureUsage UsesAudioInBackground() const = 0;
// Returns true if this reader is fully initialized and serving the most
// authoritative data. This can initially return false as the backing store is
// loaded asynchronously.
virtual bool DataLoaded() const = 0;
// Registers a callback that will be invoked when the data backing this object
// has been loaded. Note that if "DataLoaded" is true at the time this is
// called it may immediately invoke the callback. The callback will not be
// invoked after this object has been destroyed.
virtual void RegisterDataLoadedCallback(base::OnceClosure&& callback) = 0;
};
class SiteDataReaderImpl : public SiteDataReader {
public:
SiteDataReaderImpl(const SiteDataReaderImpl&) = delete;
SiteDataReaderImpl& operator=(const SiteDataReaderImpl&) = delete;
~SiteDataReaderImpl() override;
// SiteDataReader:
SiteFeatureUsage UpdatesFaviconInBackground() const override;
SiteFeatureUsage UpdatesTitleInBackground() const override;
SiteFeatureUsage UsesAudioInBackground() const override;
bool DataLoaded() const override;
void RegisterDataLoadedCallback(base::OnceClosure&& callback) override;
private:
friend class SiteDataCacheImpl;
friend class SiteDataReaderTest;
FRIEND_TEST_ALL_PREFIXES(SiteDataReaderTest,
DestroyingReaderCancelsPendingCallbacks);
FRIEND_TEST_ALL_PREFIXES(SiteDataReaderTest,
FreeingReaderDoesntCauseWriteOperation);
FRIEND_TEST_ALL_PREFIXES(SiteDataReaderTest, OnDataLoadedCallbackInvoked);
// Private constructor, these objects are meant to be created by a site data
// store.
explicit SiteDataReaderImpl(scoped_refptr<internal::SiteDataImpl> impl);
// Runs the provided closure. This is used as a wrapper so that callbacks
// registered with the |impl_| by this reader are invalidated when the
// reader is destroyed.
void RunClosure(base::OnceClosure&& closure);
// The SiteDataImpl object we delegate to.
const scoped_refptr<internal::SiteDataImpl> impl_;
// Used for invalidating callbacks.
base::WeakPtrFactory<SiteDataReaderImpl> weak_factory_{this};
};
} // namespace performance_manager
#endif // COMPONENTS_PERFORMANCE_MANAGER_PUBLIC_PERSISTENCE_SITE_DATA_SITE_DATA_READER_H_
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