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// Copyright 2014 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 "cc/base/delayed_unique_notifier.h"
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/location.h"
#include "base/sequenced_task_runner.h"
namespace cc {
DelayedUniqueNotifier::DelayedUniqueNotifier(
base::SequencedTaskRunner* task_runner,
const base::Closure& closure,
const base::TimeDelta& delay)
: task_runner_(task_runner),
closure_(closure),
delay_(delay),
notification_pending_(false),
weak_ptr_factory_(this) {
}
DelayedUniqueNotifier::~DelayedUniqueNotifier() {
}
void DelayedUniqueNotifier::Schedule() {
if (notification_pending_) {
next_notification_time_ = Now() + delay_;
return;
}
next_notification_time_ = Now() + delay_;
task_runner_->PostDelayedTask(FROM_HERE,
base::Bind(&DelayedUniqueNotifier::NotifyIfTime,
weak_ptr_factory_.GetWeakPtr()),
delay_);
notification_pending_ = true;
}
void DelayedUniqueNotifier::Cancel() {
next_notification_time_ = base::TimeTicks();
}
void DelayedUniqueNotifier::Shutdown() {
// This function must destroy any weak ptrs since after being cancelled, this
// class may be destroyed on another thread during compositor shutdown.
weak_ptr_factory_.InvalidateWeakPtrs();
// Deliberately leaves notification_pending_ = true forever so new tasks with
// weak ptrs can not be created.
notification_pending_ = true;
}
bool DelayedUniqueNotifier::HasPendingNotification() const {
return notification_pending_ && !next_notification_time_.is_null();
}
base::TimeTicks DelayedUniqueNotifier::Now() const {
return base::TimeTicks::Now();
}
void DelayedUniqueNotifier::NotifyIfTime() {
// If next notifiaction time is not valid, then this schedule was canceled.
if (next_notification_time_.is_null()) {
notification_pending_ = false;
return;
}
// If the notification was rescheduled or arrived too early for any other
// reason, then post another task instead of running the callback.
base::TimeTicks now = Now();
if (next_notification_time_ > now) {
task_runner_->PostDelayedTask(
FROM_HERE,
base::Bind(&DelayedUniqueNotifier::NotifyIfTime,
weak_ptr_factory_.GetWeakPtr()),
next_notification_time_ - now);
return;
}
// Note the order here is important since closure might schedule another run.
notification_pending_ = false;
closure_.Run();
}
} // namespace cc
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