extensions/browser/serial_extension_host_queue.cc

   1 // Copyright 2015 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 "extensions/browser/serial_extension_host_queue.h"
   6
   7 #include "base/bind.h"
   8 #include "base/message_loop/message_loop.h"
   9 #include "extensions/browser/deferred_start_render_host.h"
  10
  11 namespace extensions {
  12
  13 SerialExtensionHostQueue::SerialExtensionHostQueue()
  14     : pending_create_(false), ptr_factory_(this) {
  15 }
  16
  17 SerialExtensionHostQueue::~SerialExtensionHostQueue() {
  18 }
  19
  20 void SerialExtensionHostQueue::Add(DeferredStartRenderHost* host) {
  21   queue_.push_back(host);
  22   PostTask();
  23 }
  24
  25 void SerialExtensionHostQueue::Remove(DeferredStartRenderHost* host) {
  26   std::list<DeferredStartRenderHost*>::iterator it =
  27       std::find(queue_.begin(), queue_.end(), host);
  28   if (it != queue_.end())
  29     queue_.erase(it);
  30 }
  31
  32 void SerialExtensionHostQueue::PostTask() {
  33   if (!pending_create_) {
  34     base::MessageLoop::current()->PostTask(
  35         FROM_HERE, base::Bind(&SerialExtensionHostQueue::ProcessOneHost,
  36                               ptr_factory_.GetWeakPtr()));
  37     pending_create_ = true;
  38   }
  39 }
  40
  41 void SerialExtensionHostQueue::ProcessOneHost() {
  42   pending_create_ = false;
  43   if (queue_.empty())
  44     return;  // can happen on shutdown
  45
  46   queue_.front()->CreateRenderViewNow();
  47   queue_.pop_front();
  48
  49   if (!queue_.empty())
  50     PostTask();
  51 }
  52
  53 }  // namespace extensions