blob: 01b50054a5e758e6757633c0d723063dd8c5b0d1 [file] [log] [blame]
// Copyright 2016 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.
#include "net/nqe/network_quality_store.h"
#include "net/base/network_change_notifier.h"
namespace net {
namespace nqe {
namespace internal {
NetworkQualityStore::NetworkQualityStore() {
static_assert(kMaximumNetworkQualityCacheSize > 0,
"Size of the network quality cache must be > 0");
// This limit should not be increased unless the logic for removing the
// oldest cache entry is rewritten to use a doubly-linked-list LRU queue.
static_assert(kMaximumNetworkQualityCacheSize <= 10,
"Size of the network quality cache must <= 10");
}
NetworkQualityStore::~NetworkQualityStore() {
DCHECK(thread_checker_.CalledOnValidThread());
}
void NetworkQualityStore::Add(
const nqe::internal::NetworkID& network_id,
const nqe::internal::CachedNetworkQuality& cached_network_quality) {
DCHECK(thread_checker_.CalledOnValidThread());
DCHECK_LE(cached_network_qualities_.size(),
static_cast<size_t>(kMaximumNetworkQualityCacheSize));
// If the network name is unavailable, caching should not be performed.
if (network_id.type != net::NetworkChangeNotifier::CONNECTION_ETHERNET &&
network_id.id.empty()) {
return;
}
// Remove the entry from the map, if it is already present.
cached_network_qualities_.erase(network_id);
if (cached_network_qualities_.size() == kMaximumNetworkQualityCacheSize) {
// Remove the oldest entry.
CachedNetworkQualities::iterator oldest_entry_iterator =
cached_network_qualities_.begin();
for (CachedNetworkQualities::iterator it =
cached_network_qualities_.begin();
it != cached_network_qualities_.end(); ++it) {
if ((it->second).OlderThan(oldest_entry_iterator->second))
oldest_entry_iterator = it;
}
cached_network_qualities_.erase(oldest_entry_iterator);
}
cached_network_qualities_.insert(
std::make_pair(network_id, cached_network_quality));
DCHECK_LE(cached_network_qualities_.size(),
static_cast<size_t>(kMaximumNetworkQualityCacheSize));
for (auto& observer : network_qualities_cache_observer_list_)
observer.OnChangeInCachedNetworkQuality(network_id, cached_network_quality);
}
bool NetworkQualityStore::GetById(
const nqe::internal::NetworkID& network_id,
nqe::internal::CachedNetworkQuality* cached_network_quality) {
DCHECK(thread_checker_.CalledOnValidThread());
CachedNetworkQualities::const_iterator it =
cached_network_qualities_.find(network_id);
if (it == cached_network_qualities_.end())
return false;
*cached_network_quality = it->second;
return true;
}
void NetworkQualityStore::AddNetworkQualitiesCacheObserver(
nqe::internal::NetworkQualityStore::NetworkQualitiesCacheObserver*
observer) {
DCHECK(thread_checker_.CalledOnValidThread());
network_qualities_cache_observer_list_.AddObserver(observer);
}
void NetworkQualityStore::RemoveNetworkQualitiesCacheObserver(
nqe::internal::NetworkQualityStore::NetworkQualitiesCacheObserver*
observer) {
DCHECK(thread_checker_.CalledOnValidThread());
network_qualities_cache_observer_list_.RemoveObserver(observer);
}
} // namespace internal
} // namespace nqe
} // namespace net