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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/modules/compute_pressure/pressure_observer_manager.h"
#include "base/notreached.h"
#include "mojo/public/cpp/bindings/pending_flush.h"
#include "mojo/public/cpp/bindings/pending_receiver.h"
#include "services/device/public/mojom/pressure_update.mojom-blink.h"
#include "third_party/blink/public/platform/browser_interface_broker_proxy.h"
#include "third_party/blink/renderer/bindings/modules/v8/v8_pressure_source.h"
#include "third_party/blink/renderer/core/execution_context/execution_context.h"
#include "third_party/blink/renderer/platform/bindings/exception_code.h"
#include "third_party/blink/renderer/platform/wtf/functional.h"
using device::mojom::blink::PressureSource;
namespace blink {
namespace {
PressureSource V8PressureSourceToPressureSource(V8PressureSource::Enum source) {
switch (source) {
case V8PressureSource::Enum::kCpu:
return PressureSource::kCpu;
}
NOTREACHED();
}
} // namespace
// static
const char PressureObserverManager::kSupplementName[] =
"PressureObserverManager";
// static
PressureObserverManager* PressureObserverManager::From(
ExecutionContext* context) {
PressureObserverManager* manager =
Supplement<ExecutionContext>::From<PressureObserverManager>(context);
if (!manager) {
manager = MakeGarbageCollected<PressureObserverManager>(context);
Supplement<ExecutionContext>::ProvideTo(*context, manager);
}
return manager;
}
PressureObserverManager::PressureObserverManager(ExecutionContext* context)
: ExecutionContextLifecycleStateObserver(context),
Supplement<ExecutionContext>(*context),
pressure_manager_(context) {
UpdateStateIfNeeded();
for (const auto& source : PressureObserver::knownSources()) {
source_to_client_.insert(
source.AsEnum(),
MakeGarbageCollected<PressureClientImpl>(context, this));
}
}
PressureObserverManager::~PressureObserverManager() = default;
void PressureObserverManager::AddObserver(V8PressureSource::Enum source,
PressureObserver* observer) {
PressureClientImpl* client = source_to_client_.at(source);
client->AddObserver(observer);
const PressureClientImpl::State state = client->state();
if (state == PressureClientImpl::State::kUninitialized) {
client->set_state(PressureClientImpl::State::kInitializing);
// Not connected to the browser side for `source` yet. Make the binding.
auto task_runner =
GetExecutionContext()->GetTaskRunner(TaskType::kUserInteraction);
EnsureConnection(task_runner);
pressure_manager_->AddClient(
V8PressureSourceToPressureSource(source),
client->BindNewEndpointAndPassRemote(task_runner),
WTF::BindOnce(&PressureObserverManager::DidAddClient,
WrapWeakPersistent(this), source));
} else if (state == PressureClientImpl::State::kInitialized) {
observer->OnBindingSucceeded(source);
}
}
void PressureObserverManager::RemoveObserver(V8PressureSource::Enum source,
PressureObserver* observer) {
PressureClientImpl* client = source_to_client_.at(source);
client->RemoveObserver(observer);
}
void PressureObserverManager::RemoveObserverFromAllSources(
PressureObserver* observer) {
for (auto source : source_to_client_.Keys()) {
RemoveObserver(source, observer);
}
}
void PressureObserverManager::ContextDestroyed() {
Reset();
}
void PressureObserverManager::ContextLifecycleStateChanged(
mojom::blink::FrameLifecycleState state) {
// TODO(https://crbug.com/1186433): Disconnect and re-establish a connection
// when frozen or send a disconnect event.
}
void PressureObserverManager::Trace(Visitor* visitor) const {
visitor->Trace(pressure_manager_);
visitor->Trace(source_to_client_);
ExecutionContextLifecycleStateObserver::Trace(visitor);
Supplement<ExecutionContext>::Trace(visitor);
}
void PressureObserverManager::EnsureConnection(
scoped_refptr<base::SingleThreadTaskRunner> task_runner) {
CHECK(GetExecutionContext());
if (!pressure_manager_.is_bound()) {
GetExecutionContext()->GetBrowserInterfaceBroker().GetInterface(
pressure_manager_.BindNewPipeAndPassReceiver(task_runner));
pressure_manager_.set_disconnect_handler(WTF::BindOnce(
&PressureObserverManager::OnConnectionError, WrapWeakPersistent(this)));
}
}
void PressureObserverManager::OnConnectionError() {
for (PressureClientImpl* client : source_to_client_.Values()) {
// Take a snapshot so as to safely iterate.
HeapVector<Member<PressureObserver>> observers(client->observers());
for (const auto& observer : observers) {
observer->OnConnectionError();
}
}
Reset();
}
void PressureObserverManager::Reset() {
for (PressureClientImpl* client : source_to_client_.Values()) {
client->Reset();
}
pressure_manager_.reset();
}
void PressureObserverManager::DidAddClient(
V8PressureSource::Enum source,
device::mojom::blink::PressureManagerAddClientResult result) {
PressureClientImpl* client = source_to_client_.at(source);
// PressureClientImpl may be reset by PressureObserver's
// unobserve()/disconnect() before this function is called.
if (client->state() != PressureClientImpl::State::kInitializing) {
return;
}
CHECK(pressure_manager_.is_bound());
// Take a snapshot so as to safely iterate.
HeapVector<Member<PressureObserver>> observers(client->observers());
switch (result) {
case device::mojom::blink::PressureManagerAddClientResult::kOk: {
client->set_state(PressureClientImpl::State::kInitialized);
for (const auto& observer : observers) {
observer->OnBindingSucceeded(source);
}
break;
}
case device::mojom::blink::PressureManagerAddClientResult::kNotSupported: {
for (const auto& observer : observers) {
observer->OnBindingFailed(source, DOMExceptionCode::kNotSupportedError);
}
client->Reset();
break;
}
}
}
} // namespace blink
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