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/*
* Copyright 2020 The WebRTC Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "call/adaptation/broadcast_resource_listener.h"
#include <algorithm>
#include <string>
#include <utility>
#include "rtc_base/checks.h"
#include "rtc_base/ref_counted_object.h"
#include "rtc_base/synchronization/mutex.h"
namespace webrtc {
// The AdapterResource redirects resource usage measurements from its parent to
// a single ResourceListener.
class BroadcastResourceListener::AdapterResource : public Resource {
public:
explicit AdapterResource(std::string name) : name_(std::move(name)) {}
~AdapterResource() override { RTC_DCHECK(!listener_); }
// The parent is letting us know we have a usage neasurement.
void OnResourceUsageStateMeasured(ResourceUsageState usage_state) {
MutexLock lock(&lock_);
if (!listener_)
return;
listener_->OnResourceUsageStateMeasured(this, usage_state);
}
// Resource implementation.
std::string Name() const override { return name_; }
void SetResourceListener(ResourceListener* listener) override {
MutexLock lock(&lock_);
RTC_DCHECK(!listener_ || !listener);
listener_ = listener;
}
private:
const std::string name_;
Mutex lock_;
ResourceListener* listener_ RTC_GUARDED_BY(lock_) = nullptr;
};
BroadcastResourceListener::BroadcastResourceListener(
rtc::scoped_refptr<Resource> source_resource)
: source_resource_(source_resource), is_listening_(false) {
RTC_DCHECK(source_resource_);
}
BroadcastResourceListener::~BroadcastResourceListener() {
RTC_DCHECK(!is_listening_);
}
rtc::scoped_refptr<Resource> BroadcastResourceListener::SourceResource() const {
return source_resource_;
}
void BroadcastResourceListener::StartListening() {
MutexLock lock(&lock_);
RTC_DCHECK(!is_listening_);
source_resource_->SetResourceListener(this);
is_listening_ = true;
}
void BroadcastResourceListener::StopListening() {
MutexLock lock(&lock_);
RTC_DCHECK(is_listening_);
RTC_DCHECK(adapters_.empty());
source_resource_->SetResourceListener(nullptr);
is_listening_ = false;
}
rtc::scoped_refptr<Resource>
BroadcastResourceListener::CreateAdapterResource() {
MutexLock lock(&lock_);
RTC_DCHECK(is_listening_);
rtc::scoped_refptr<AdapterResource> adapter =
rtc::make_ref_counted<AdapterResource>(source_resource_->Name() +
"Adapter");
adapters_.push_back(adapter);
return adapter;
}
void BroadcastResourceListener::RemoveAdapterResource(
rtc::scoped_refptr<Resource> resource) {
MutexLock lock(&lock_);
auto it = std::find(adapters_.begin(), adapters_.end(), resource);
RTC_DCHECK(it != adapters_.end());
adapters_.erase(it);
}
std::vector<rtc::scoped_refptr<Resource>>
BroadcastResourceListener::GetAdapterResources() {
std::vector<rtc::scoped_refptr<Resource>> resources;
MutexLock lock(&lock_);
for (const auto& adapter : adapters_) {
resources.push_back(adapter);
}
return resources;
}
void BroadcastResourceListener::OnResourceUsageStateMeasured(
rtc::scoped_refptr<Resource> resource,
ResourceUsageState usage_state) {
RTC_DCHECK_EQ(resource, source_resource_);
MutexLock lock(&lock_);
for (const auto& adapter : adapters_) {
adapter->OnResourceUsageStateMeasured(usage_state);
}
}
} // namespace webrtc
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