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// Copyright 2015 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 "chrome/browser/ui/webui/media_router/query_result_manager.h"
#include "base/containers/hash_tables.h"
#include "base/stl_util.h"
#include "chrome/browser/media/router/media_router.h"
#include "chrome/browser/media/router/media_sinks_observer.h"
namespace media_router {
// MediaSinkObserver that propagates results back to |result_manager|.
// An instance of this class is associated with each registered MediaCastMode.
class QueryResultManager::CastModeMediaSinksObserver
: public MediaSinksObserver {
public:
CastModeMediaSinksObserver(MediaCastMode cast_mode,
const MediaSource& source,
MediaRouter* router,
QueryResultManager* result_manager)
: MediaSinksObserver(router, source),
cast_mode_(cast_mode),
result_manager_(result_manager) {
DCHECK(result_manager);
}
~CastModeMediaSinksObserver() override {}
// MediaSinksObserver
void OnSinksReceived(const std::vector<MediaSink>& result) override {
latest_sink_ids_.clear();
for (const MediaSink& sink : result) {
latest_sink_ids_.push_back(sink.id());
}
result_manager_->UpdateWithSinksQueryResult(cast_mode_, result);
result_manager_->NotifyOnResultsUpdated();
}
// Returns the most recent sink IDs that were passed to |OnSinksReceived|.
void GetLatestSinkIds(std::vector<MediaSink::Id>* sink_ids) const {
DCHECK(sink_ids);
*sink_ids = latest_sink_ids_;
}
MediaCastMode cast_mode() const { return cast_mode_; }
private:
MediaCastMode cast_mode_;
std::vector<MediaSink::Id> latest_sink_ids_;
QueryResultManager* result_manager_;
};
QueryResultManager::QueryResultManager(MediaRouter* router) : router_(router) {
DCHECK(router_);
}
QueryResultManager::~QueryResultManager() {
DCHECK(thread_checker_.CalledOnValidThread());
}
void QueryResultManager::AddObserver(Observer* observer) {
DCHECK(thread_checker_.CalledOnValidThread());
DCHECK(observer);
observers_.AddObserver(observer);
}
void QueryResultManager::RemoveObserver(Observer* observer) {
DCHECK(thread_checker_.CalledOnValidThread());
DCHECK(observer);
observers_.RemoveObserver(observer);
}
void QueryResultManager::StartSinksQuery(MediaCastMode cast_mode,
const MediaSource& source) {
DCHECK(thread_checker_.CalledOnValidThread());
if (source.Empty()) {
LOG(WARNING) << "StartSinksQuery called with empty source for "
<< cast_mode;
return;
}
SetSourceForCastMode(cast_mode, source);
RemoveObserverForCastMode(cast_mode);
UpdateWithSinksQueryResult(cast_mode, std::vector<MediaSink>());
scoped_ptr<CastModeMediaSinksObserver> observer(
new CastModeMediaSinksObserver(cast_mode, source, router_, this));
observer->Init();
auto result =
sinks_observers_.insert(std::make_pair(cast_mode, std::move(observer)));
DCHECK(result.second);
NotifyOnResultsUpdated();
}
void QueryResultManager::StopSinksQuery(MediaCastMode cast_mode) {
DCHECK(thread_checker_.CalledOnValidThread());
RemoveObserverForCastMode(cast_mode);
SetSourceForCastMode(cast_mode, MediaSource());
UpdateWithSinksQueryResult(cast_mode, std::vector<MediaSink>());
NotifyOnResultsUpdated();
}
void QueryResultManager::SetSourceForCastMode(
MediaCastMode cast_mode, const MediaSource& source) {
DCHECK(thread_checker_.CalledOnValidThread());
cast_mode_sources_[cast_mode] = source;
}
void QueryResultManager::RemoveObserverForCastMode(MediaCastMode cast_mode) {
auto observers_it = sinks_observers_.find(cast_mode);
if (observers_it != sinks_observers_.end())
sinks_observers_.erase(observers_it);
}
bool QueryResultManager::IsValid(const MediaSinkWithCastModes& entry) const {
return !entry.cast_modes.empty();
}
void QueryResultManager::UpdateWithSinksQueryResult(
MediaCastMode cast_mode,
const std::vector<MediaSink>& result) {
base::hash_set<MediaSink::Id> result_sink_ids;
for (const MediaSink& sink : result)
result_sink_ids.insert(sink.id());
// (1) Iterate through current sink set, remove cast mode from those that
// do not appear in latest result.
for (auto it = all_sinks_.begin(); it != all_sinks_.end(); /*no-op*/) {
if (!ContainsKey(result_sink_ids, it->first)) {
it->second.cast_modes.erase(cast_mode);
}
if (!IsValid(it->second)) {
all_sinks_.erase(it++);
} else {
++it;
}
}
// (2) Add / update sinks with latest result.
for (const MediaSink& sink : result) {
auto result =
all_sinks_.insert(std::make_pair(sink.id(),
MediaSinkWithCastModes(sink)));
if (!result.second)
result.first->second.sink = sink;
result.first->second.cast_modes.insert(cast_mode);
}
}
void QueryResultManager::GetSupportedCastModes(CastModeSet* cast_modes) const {
DCHECK(cast_modes);
cast_modes->clear();
for (const auto& observer_pair : sinks_observers_) {
cast_modes->insert(observer_pair.first);
}
}
MediaSource QueryResultManager::GetSourceForCastMode(
MediaCastMode cast_mode) const {
DCHECK(thread_checker_.CalledOnValidThread());
auto source_it = cast_mode_sources_.find(cast_mode);
return source_it == cast_mode_sources_.end() ?
MediaSource() : source_it->second;
}
void QueryResultManager::NotifyOnResultsUpdated() {
std::vector<MediaSinkWithCastModes> sinks;
for (const auto& sink_pair : all_sinks_) {
sinks.push_back(sink_pair.second);
}
FOR_EACH_OBSERVER(QueryResultManager::Observer, observers_,
OnResultsUpdated(sinks));
}
} // namespace media_router
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