src/extensions/renderer/lazy_background_page_native_handler.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 "extensions/renderer/lazy_background_page_native_handler.h"
   6
   7 #include "base/bind.h"
   8 #include "content/public/renderer/render_view.h"
   9 #include "extensions/common/extension_messages.h"
  10 #include "extensions/common/manifest_handlers/background_info.h"
  11 #include "extensions/renderer/extension_helper.h"
  12 #include "extensions/renderer/script_context.h"
  13
  14 namespace extensions {
  15
  16 LazyBackgroundPageNativeHandler::LazyBackgroundPageNativeHandler(
  17     ScriptContext* context)
  18     : ObjectBackedNativeHandler(context) {
  19   RouteFunction(
  20       "IncrementKeepaliveCount",
  21       base::Bind(&LazyBackgroundPageNativeHandler::IncrementKeepaliveCount,
  22                  base::Unretained(this)));
  23   RouteFunction(
  24       "DecrementKeepaliveCount",
  25       base::Bind(&LazyBackgroundPageNativeHandler::DecrementKeepaliveCount,
  26                  base::Unretained(this)));
  27 }
  28
  29 void LazyBackgroundPageNativeHandler::IncrementKeepaliveCount(
  30     const v8::FunctionCallbackInfo<v8::Value>& args) {
  31   if (!context())
  32     return;
  33   content::RenderView* render_view = context()->GetRenderView();
  34   if (IsContextLazyBackgroundPage(render_view, context()->extension())) {
  35     render_view->Send(new ExtensionHostMsg_IncrementLazyKeepaliveCount(
  36         render_view->GetRoutingID()));
  37   }
  38 }
  39
  40 void LazyBackgroundPageNativeHandler::DecrementKeepaliveCount(
  41     const v8::FunctionCallbackInfo<v8::Value>& args) {
  42   if (!context())
  43     return;
  44   content::RenderView* render_view = context()->GetRenderView();
  45   if (IsContextLazyBackgroundPage(render_view, context()->extension())) {
  46     render_view->Send(new ExtensionHostMsg_DecrementLazyKeepaliveCount(
  47         render_view->GetRoutingID()));
  48   }
  49 }
  50
  51 bool LazyBackgroundPageNativeHandler::IsContextLazyBackgroundPage(
  52     content::RenderView* render_view,
  53     const Extension* extension) {
  54   if (!render_view)
  55     return false;
  56
  57   ExtensionHelper* helper = ExtensionHelper::Get(render_view);
  58   return (extension && BackgroundInfo::HasLazyBackgroundPage(extension) &&
  59           helper->view_type() == VIEW_TYPE_EXTENSION_BACKGROUND_PAGE);
  60 }
  61
  62 }  // namespace extensions