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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 "core/dom/ScriptedIdleTaskController.h"
#include "core/dom/ExecutionContext.h"
#include "core/dom/IdleRequestCallback.h"
#include "core/dom/IdleRequestOptions.h"
#include "core/frame/PerformanceMonitor.h"
#include "core/inspector/InspectorTraceEvents.h"
#include "platform/Histogram.h"
#include "platform/instrumentation/tracing/TraceEvent.h"
#include "public/platform/Platform.h"
#include "public/platform/WebScheduler.h"
#include "public/platform/WebTraceLocation.h"
#include "wtf/CurrentTime.h"
#include "wtf/Functional.h"
#include "wtf/RefCounted.h"
namespace blink {
namespace internal {
class IdleRequestCallbackWrapper
: public RefCounted<IdleRequestCallbackWrapper> {
public:
static PassRefPtr<IdleRequestCallbackWrapper> create(
ScriptedIdleTaskController::CallbackId id,
ScriptedIdleTaskController* controller) {
return adoptRef(new IdleRequestCallbackWrapper(id, controller));
}
virtual ~IdleRequestCallbackWrapper() {}
static void idleTaskFired(
PassRefPtr<IdleRequestCallbackWrapper> callbackWrapper,
double deadlineSeconds) {
// TODO(rmcilroy): Implement clamping of deadline in some form.
if (ScriptedIdleTaskController* controller = callbackWrapper->controller())
controller->callbackFired(callbackWrapper->id(), deadlineSeconds,
IdleDeadline::CallbackType::CalledWhenIdle);
callbackWrapper->cancel();
}
static void timeoutFired(
PassRefPtr<IdleRequestCallbackWrapper> callbackWrapper) {
if (ScriptedIdleTaskController* controller = callbackWrapper->controller())
controller->callbackFired(callbackWrapper->id(),
monotonicallyIncreasingTime(),
IdleDeadline::CallbackType::CalledByTimeout);
callbackWrapper->cancel();
}
void cancel() { m_controller = nullptr; }
ScriptedIdleTaskController::CallbackId id() const { return m_id; }
ScriptedIdleTaskController* controller() const { return m_controller; }
private:
IdleRequestCallbackWrapper(ScriptedIdleTaskController::CallbackId id,
ScriptedIdleTaskController* controller)
: m_id(id), m_controller(controller) {}
ScriptedIdleTaskController::CallbackId m_id;
WeakPersistent<ScriptedIdleTaskController> m_controller;
};
} // namespace internal
ScriptedIdleTaskController::ScriptedIdleTaskController(
ExecutionContext* context)
: SuspendableObject(context),
m_scheduler(Platform::current()->currentThread()->scheduler()),
m_nextCallbackId(0),
m_suspended(false) {
suspendIfNeeded();
}
ScriptedIdleTaskController::~ScriptedIdleTaskController() {}
DEFINE_TRACE(ScriptedIdleTaskController) {
visitor->trace(m_callbacks);
SuspendableObject::trace(visitor);
}
int ScriptedIdleTaskController::nextCallbackId() {
while (true) {
++m_nextCallbackId;
if (!isValidCallbackId(m_nextCallbackId))
m_nextCallbackId = 1;
if (!m_callbacks.contains(m_nextCallbackId))
return m_nextCallbackId;
}
}
ScriptedIdleTaskController::CallbackId
ScriptedIdleTaskController::registerCallback(
IdleRequestCallback* callback,
const IdleRequestOptions& options) {
CallbackId id = nextCallbackId();
m_callbacks.set(id, callback);
long long timeoutMillis = options.timeout();
RefPtr<internal::IdleRequestCallbackWrapper> callbackWrapper =
internal::IdleRequestCallbackWrapper::create(id, this);
m_scheduler->postIdleTask(
BLINK_FROM_HERE,
WTF::bind(&internal::IdleRequestCallbackWrapper::idleTaskFired,
callbackWrapper));
if (timeoutMillis > 0)
m_scheduler->timerTaskRunner()->postDelayedTask(
BLINK_FROM_HERE,
WTF::bind(&internal::IdleRequestCallbackWrapper::timeoutFired,
callbackWrapper),
timeoutMillis);
TRACE_EVENT_INSTANT1("devtools.timeline", "RequestIdleCallback",
TRACE_EVENT_SCOPE_THREAD, "data",
InspectorIdleCallbackRequestEvent::data(
getExecutionContext(), id, timeoutMillis));
return id;
}
void ScriptedIdleTaskController::cancelCallback(CallbackId id) {
TRACE_EVENT_INSTANT1(
"devtools.timeline", "CancelIdleCallback", TRACE_EVENT_SCOPE_THREAD,
"data",
InspectorIdleCallbackCancelEvent::data(getExecutionContext(), id));
if (!isValidCallbackId(id))
return;
m_callbacks.remove(id);
}
void ScriptedIdleTaskController::callbackFired(
CallbackId id,
double deadlineSeconds,
IdleDeadline::CallbackType callbackType) {
if (!m_callbacks.contains(id))
return;
if (m_suspended) {
if (callbackType == IdleDeadline::CallbackType::CalledByTimeout) {
// Queue for execution when we are resumed.
m_pendingTimeouts.push_back(id);
}
// Just drop callbacks called while suspended, these will be reposted on the
// idle task queue when we are resumed.
return;
}
runCallback(id, deadlineSeconds, callbackType);
}
void ScriptedIdleTaskController::runCallback(
CallbackId id,
double deadlineSeconds,
IdleDeadline::CallbackType callbackType) {
DCHECK(!m_suspended);
auto callback = m_callbacks.take(id);
if (!callback)
return;
double allottedTimeMillis =
std::max((deadlineSeconds - monotonicallyIncreasingTime()) * 1000, 0.0);
DEFINE_STATIC_LOCAL(
CustomCountHistogram, idleCallbackDeadlineHistogram,
("WebCore.ScriptedIdleTaskController.IdleCallbackDeadline", 0, 50, 50));
idleCallbackDeadlineHistogram.count(allottedTimeMillis);
PerformanceMonitor::HandlerCall handlerCall(getExecutionContext(),
"requestIdleCallback", true);
TRACE_EVENT1(
"devtools.timeline", "FireIdleCallback", "data",
InspectorIdleCallbackFireEvent::data(
getExecutionContext(), id, allottedTimeMillis,
callbackType == IdleDeadline::CallbackType::CalledByTimeout));
callback->handleEvent(IdleDeadline::create(deadlineSeconds, callbackType));
double overrunMillis =
std::max((monotonicallyIncreasingTime() - deadlineSeconds) * 1000, 0.0);
DEFINE_STATIC_LOCAL(
CustomCountHistogram, idleCallbackOverrunHistogram,
("WebCore.ScriptedIdleTaskController.IdleCallbackOverrun", 0, 10000, 50));
idleCallbackOverrunHistogram.count(overrunMillis);
}
void ScriptedIdleTaskController::contextDestroyed(ExecutionContext*) {
m_callbacks.clear();
}
void ScriptedIdleTaskController::suspend() {
m_suspended = true;
}
void ScriptedIdleTaskController::resume() {
DCHECK(m_suspended);
m_suspended = false;
// Run any pending timeouts.
Vector<CallbackId> pendingTimeouts;
m_pendingTimeouts.swap(pendingTimeouts);
for (auto& id : pendingTimeouts)
runCallback(id, monotonicallyIncreasingTime(),
IdleDeadline::CallbackType::CalledByTimeout);
// Repost idle tasks for any remaining callbacks.
for (auto& callback : m_callbacks) {
RefPtr<internal::IdleRequestCallbackWrapper> callbackWrapper =
internal::IdleRequestCallbackWrapper::create(callback.key, this);
m_scheduler->postIdleTask(
BLINK_FROM_HERE,
WTF::bind(&internal::IdleRequestCallbackWrapper::idleTaskFired,
callbackWrapper));
}
}
} // namespace blink
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