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/*
* Copyright (C) 2010 Google Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include "third_party/blink/renderer/core/dom/events/event_queue.h"
#include "base/macros.h"
#include "third_party/blink/public/platform/task_type.h"
#include "third_party/blink/renderer/core/dom/events/event.h"
#include "third_party/blink/renderer/core/frame/local_dom_window.h"
#include "third_party/blink/renderer/core/probe/core_probes.h"
#include "third_party/blink/renderer/platform/wtf/functional.h"
namespace blink {
EventQueue::EventQueue(ExecutionContext* context, TaskType task_type)
: ContextLifecycleObserver(context),
task_type_(task_type),
is_closed_(false) {
if (!GetExecutionContext() || GetExecutionContext()->IsContextDestroyed())
Close(nullptr);
}
EventQueue::~EventQueue() = default;
void EventQueue::Trace(Visitor* visitor) {
visitor->Trace(queued_events_);
ContextLifecycleObserver::Trace(visitor);
}
bool EventQueue::EnqueueEvent(const base::Location& from_here, Event& event) {
if (is_closed_)
return false;
DCHECK(event.target());
DCHECK(GetExecutionContext());
probe::AsyncTaskScheduled(GetExecutionContext(), event.type(),
event.async_task_id());
bool was_added = queued_events_.insert(&event).is_new_entry;
DCHECK(was_added); // It should not have already been in the list.
scoped_refptr<base::SingleThreadTaskRunner> task_runner =
GetExecutionContext()->GetTaskRunner(task_type_);
// Pass the event as a weak persistent so that GC can collect an event-related
// object like IDBTransaction as soon as possible.
task_runner->PostTask(
FROM_HERE, WTF::Bind(&EventQueue::DispatchEvent, WrapPersistent(this),
WrapWeakPersistent(&event)));
return true;
}
void EventQueue::CancelAllEvents() {
if (!GetExecutionContext()) {
DCHECK(!queued_events_.size());
return;
}
DoCancelAllEvents(GetExecutionContext());
}
bool EventQueue::RemoveEvent(Event& event) {
auto found = queued_events_.find(&event);
if (found == queued_events_.end())
return false;
queued_events_.erase(found);
return true;
}
void EventQueue::DispatchEvent(Event* event) {
if (!event || !RemoveEvent(*event))
return;
DCHECK(GetExecutionContext());
probe::AsyncTask async_task(GetExecutionContext(), event->async_task_id());
EventTarget* target = event->target();
if (LocalDOMWindow* window = target->ToLocalDOMWindow())
window->DispatchEvent(*event, nullptr);
else
target->DispatchEvent(*event);
}
void EventQueue::ContextDestroyed(ExecutionContext* context) {
Close(context);
}
void EventQueue::Close(ExecutionContext* context) {
is_closed_ = true;
DoCancelAllEvents(context);
}
void EventQueue::DoCancelAllEvents(ExecutionContext* context) {
for (const auto& queued_event : queued_events_)
probe::AsyncTaskCanceled(context, queued_event->async_task_id());
queued_events_.clear();
}
bool EventQueue::HasPendingEvents() const {
return queued_events_.size() > 0;
}
} // namespace blink