cc/base/unique_notifier.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "cc/base/unique_notifier.h"
   6
   7 #include "base/bind.h"
   8 #include "base/bind_helpers.h"
   9 #include "base/location.h"
  10 #include "base/sequenced_task_runner.h"
  11
  12 namespace cc {
  13
  14 UniqueNotifier::UniqueNotifier(base::SequencedTaskRunner* task_runner,
  15                                const base::Closure& closure)
  16     : task_runner_(task_runner),
  17       closure_(closure),
  18       notification_pending_(false),
  19       weak_ptr_factory_(this) {
  20 }
  21
  22 UniqueNotifier::~UniqueNotifier() {
  23 }
  24
  25 void UniqueNotifier::Cancel() {
  26   notification_pending_ = false;
  27 }
  28
  29 void UniqueNotifier::Schedule() {
  30   if (notification_pending_)
  31     return;
  32
  33   task_runner_->PostTask(
  34       FROM_HERE,
  35       base::Bind(&UniqueNotifier::Notify, weak_ptr_factory_.GetWeakPtr()));
  36   notification_pending_ = true;
  37 }
  38
  39 void UniqueNotifier::Notify() {
  40   if (!notification_pending_)
  41     return;
  42
  43   // Note that the order here is important in case closure schedules another
  44   // run.
  45   notification_pending_ = false;
  46   closure_.Run();
  47 }
  48
  49 }  // namespace cc