| // Copyright 2018 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 CHROMEOS_COMPONENTS_MULTIDEVICE_EXPIRING_REMOTE_DEVICE_CACHE_H_ |
| #define CHROMEOS_COMPONENTS_MULTIDEVICE_EXPIRING_REMOTE_DEVICE_CACHE_H_ |
| |
| #include <memory> |
| |
| #include "base/macros.h" |
| #include "base/optional.h" |
| #include "chromeos/components/multidevice/remote_device.h" |
| #include "chromeos/components/multidevice/remote_device_ref.h" |
| |
| namespace chromeos { |
| |
| namespace 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(). |
| class ExpiringRemoteDeviceCache { |
| public: |
| ExpiringRemoteDeviceCache(); |
| 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); |
| |
| base::Optional<RemoteDeviceRef> GetRemoteDevice( |
| const std::string& device_id) const; |
| |
| private: |
| std::unique_ptr<RemoteDeviceCache> remote_device_cache_; |
| std::set<std::string> device_ids_from_last_set_call_; |
| |
| DISALLOW_COPY_AND_ASSIGN(ExpiringRemoteDeviceCache); |
| }; |
| |
| } // namespace multidevice |
| |
| } // namespace chromeos |
| |
| #endif // CHROMEOS_COMPONENTS_MULTIDEVICE_EXPIRING_REMOTE_DEVICE_CACHE_H_ |