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// Copyright 2017 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_TETHER_HOST_SCAN_CACHE_H_
#define CHROMEOS_ASH_COMPONENTS_TETHER_HOST_SCAN_CACHE_H_
#include <string>
#include <unordered_set>
#include "base/observer_list.h"
#include "chromeos/ash/components/tether/host_scan_cache_entry.h"
namespace ash {
namespace tether {
// Caches host scan results.
class HostScanCache {
public:
HostScanCache();
HostScanCache(const HostScanCache&) = delete;
HostScanCache& operator=(const HostScanCache&) = delete;
virtual ~HostScanCache();
class Observer {
public:
virtual void OnCacheBecameEmpty() {}
};
void AddObserver(Observer* observer);
void RemoveObserver(Observer* observer);
// Updates the cache to include this scan result. If no scan result for
// |tether_network_guid| exists in the cache, a scan result will be added;
// if a scan result is already present, it is updated with the new data
// provided as parameters to this function.
virtual void SetHostScanResult(const HostScanCacheEntry& entry) = 0;
// Removes the scan result with GUID |tether_network_guid| from the cache, and
// notifies observers if the cache becomes empty. If no scan result with that
// GUID was present in the cache, this function is a no-op. Returns whether a
// scan result was actually removed.
bool RemoveHostScanResult(const std::string& tether_network_guid);
// Returns whether an entry corresponding to GUId |tether_network_gui| exists
// in the cache.
virtual bool ExistsInCache(const std::string& tether_network_guid) = 0;
// Returns a set of all Tether network GUIDs that are present in the cache.
virtual std::unordered_set<std::string> GetTetherGuidsInCache() = 0;
// Returns whether the scan result corresponding to |tether_network_guid|
// requires first-time setup (i.e., user interaction) to allow tethering.
virtual bool DoesHostRequireSetup(const std::string& tether_network_guid) = 0;
protected:
virtual bool RemoveHostScanResultImpl(
const std::string& tether_network_guid) = 0;
private:
base::ObserverList<Observer>::Unchecked observer_list_;
};
} // namespace tether
} // namespace ash
#endif // CHROMEOS_ASH_COMPONENTS_TETHER_HOST_SCAN_CACHE_H_
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