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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROMEOS_ASH_COMPONENTS_MULTIDEVICE_EXPIRING_REMOTE_DEVICE_CACHE_H_
#define CHROMEOS_ASH_COMPONENTS_MULTIDEVICE_EXPIRING_REMOTE_DEVICE_CACHE_H_
#include <memory>
#include <optional>
#include <string>
#include "base/containers/flat_set.h"
#include "chromeos/ash/components/multidevice/remote_device.h"
#include "chromeos/ash/components/multidevice/remote_device_ref.h"
namespace ash::multidevice {
class RemoteDeviceCache;
// A helper class around RemoteDeviceCache which keeps track of which devices
// have been removed from, or "expired" in, the cache.
//
// If the set of devices provided to SetRemoteDevicesAndInvalidateOldEntries()
// is different from the set provided to a previous call to
// SetRemoteDevicesAndInvalidateOldEntries(), then the devices in the previous
// call which are not in the new call will be marked as stale. Stale devices are
// still valid RemoteDeviceRefs (preventing clients from segfaulting), but will
// not be returned by GetNonExpiredRemoteDevices().
//
// Note: Because RemoteDeviceCache supports both Instance IDs and legacy device
// IDs, ExpiringRemoteDeviceCache does the same.
class ExpiringRemoteDeviceCache {
public:
ExpiringRemoteDeviceCache();
ExpiringRemoteDeviceCache(const ExpiringRemoteDeviceCache&) = delete;
ExpiringRemoteDeviceCache& operator=(const ExpiringRemoteDeviceCache&) =
delete;
virtual ~ExpiringRemoteDeviceCache();
void SetRemoteDevicesAndInvalidateOldEntries(
const RemoteDeviceList& remote_devices);
RemoteDeviceRefList GetNonExpiredRemoteDevices() const;
// Add or update a RemoteDevice without marking any other devices in the cache
// as stale.
void UpdateRemoteDevice(const RemoteDevice& remote_device);
// Looks up device in cache by Instance ID, |instance_id|, and by the legacy
// device ID from RemoteDevice::GetDeviceId(), |legacy_device_id|. Returns the
// first device that matches either ID. Returns null if no such device exists.
//
// For best results, pass in both IDs when available since the device could
// have been written to the cache with one of the IDs missing.
std::optional<RemoteDeviceRef> GetRemoteDevice(
const std::optional<std::string>& instance_id,
const std::optional<std::string>& legacy_device_id) const;
private:
void RememberIdsFromLastSetCall(const RemoteDevice& device);
std::unique_ptr<RemoteDeviceCache> remote_device_cache_;
base::flat_set<std::string> legacy_device_ids_from_last_set_call_;
base::flat_set<std::string> instance_ids_from_last_set_call_;
};
} // namespace ash::multidevice
#endif // CHROMEOS_ASH_COMPONENTS_MULTIDEVICE_EXPIRING_REMOTE_DEVICE_CACHE_H_
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