chrome/browser/safe_browsing/incident_reporting/delayed_callback_runner.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 "chrome/browser/safe_browsing/incident_reporting/delayed_callback_runner.h"
   6
   7 #include "base/location.h"
   8
   9 namespace safe_browsing {
  10
  11 DelayedCallbackRunner::DelayedCallbackRunner(
  12     base::TimeDelta delay,
  13     const scoped_refptr<base::TaskRunner>& task_runner)
  14     : task_runner_(task_runner),
  15       next_callback_(callbacks_.end()),
  16       timer_(FROM_HERE, delay, this, &DelayedCallbackRunner::OnTimer) {
  17 }
  18
  19 DelayedCallbackRunner::~DelayedCallbackRunner() {
  20 }
  21
  22 void DelayedCallbackRunner::RegisterCallback(const base::Closure& callback) {
  23   DCHECK(thread_checker_.CalledOnValidThread());
  24   callbacks_.push_back(callback);
  25 }
  26
  27 void DelayedCallbackRunner::Start() {
  28   DCHECK(thread_checker_.CalledOnValidThread());
  29
  30   // Nothing to do if the runner is already running or nothing has been added.
  31   if (next_callback_ != callbacks_.end() || callbacks_.empty())
  32     return;
  33
  34   // Prime the system with the first callback.
  35   next_callback_ = callbacks_.begin();
  36
  37   // Point the starter pistol in the air and pull the trigger.
  38   timer_.Reset();
  39 }
  40
  41 void DelayedCallbackRunner::OnTimer() {
  42   // Run the next callback on the task runner.
  43   task_runner_->PostTask(FROM_HERE, *next_callback_);
  44
  45   // Remove this callback and get ready for the next if there is one.
  46   next_callback_ = callbacks_.erase(next_callback_);
  47   if (next_callback_ != callbacks_.end())
  48     timer_.Reset();
  49 }
  50
  51 }  // namespace safe_browsing