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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/feature_observer.h"
#include "base/compiler_specific.h"
#include "content/public/browser/content_browser_client.h"
#include "content/public/browser/feature_observer_client.h"
#include "content/public/common/content_client.h"
namespace content {
FeatureObserver::FeatureObserver(FeatureObserverClient* client,
GlobalRenderFrameHostId id)
: client_(client), id_(id) {
DCHECK(client_);
for (size_t i = 0;
i <= static_cast<size_t>(blink::mojom::ObservedFeatureType::kMaxValue);
++i) {
UNSAFE_TODO(features_by_type_[i])
.set_disconnect_handler(base::BindRepeating(
[](mojo::ReceiverSet<blink::mojom::ObservedFeature>* set,
FeatureObserverClient* client, GlobalRenderFrameHostId id,
blink::mojom::ObservedFeatureType type) {
if (!set->empty())
return;
// Notify if this is the last receiver.
client->OnStopUsing(id, type);
},
base::Unretained(UNSAFE_TODO(&features_by_type_[i])), client_, id_,
static_cast<blink::mojom::ObservedFeatureType>(i)));
}
}
FeatureObserver::~FeatureObserver() = default;
void FeatureObserver::GetFeatureObserver(
mojo::PendingReceiver<blink::mojom::FeatureObserver> receiver) {
observers_.Add(this, std::move(receiver));
}
void FeatureObserver::Register(
mojo::PendingReceiver<blink::mojom::ObservedFeature> feature,
blink::mojom::ObservedFeatureType type) {
DCHECK(client_);
auto& set = UNSAFE_TODO(features_by_type_[static_cast<int>(type)]);
// Notify if this is the first receiver.
if (set.empty())
client_->OnStartUsing(id_, type);
set.Add(nullptr, std::move(feature));
}
} // namespace content
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