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// Copyright (c) 2012 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 "chrome/browser/extensions/lazy_background_task_queue.h"
#include "base/callback.h"
#include "chrome/browser/extensions/extension_host.h"
#include "chrome/browser/extensions/extension_process_manager.h"
#include "chrome/browser/extensions/extension_service.h"
#include "chrome/browser/extensions/extension_tab_util.h"
#include "chrome/browser/extensions/process_map.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/tab_contents/tab_util.h"
#include "chrome/browser/ui/tab_contents/tab_contents_wrapper.h"
#include "chrome/common/chrome_notification_types.h"
#include "chrome/common/chrome_view_type.h"
#include "chrome/common/extensions/extension.h"
#include "chrome/common/extensions/extension_messages.h"
#include "content/public/browser/notification_service.h"
#include "content/public/browser/render_process_host.h"
#include "content/public/browser/render_view_host.h"
#include "content/public/browser/site_instance.h"
#include "content/public/browser/web_contents.h"
namespace extensions {
LazyBackgroundTaskQueue::LazyBackgroundTaskQueue(Profile* profile)
: profile_(profile) {
registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_HOST_DID_STOP_LOADING,
content::NotificationService::AllBrowserContextsAndSources());
registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_UNLOADED,
content::Source<Profile>(profile));
}
LazyBackgroundTaskQueue::~LazyBackgroundTaskQueue() {
}
bool LazyBackgroundTaskQueue::ShouldEnqueueTask(
Profile* profile, const Extension* extension) {
DCHECK(extension);
if (extension->has_lazy_background_page()) {
ExtensionProcessManager* pm = profile->GetExtensionProcessManager();
ExtensionHost* background_host =
pm->GetBackgroundHostForExtension(extension->id());
if (!background_host || !background_host->did_stop_loading())
return true;
}
return false;
}
void LazyBackgroundTaskQueue::AddPendingTask(
Profile* profile,
const std::string& extension_id,
const PendingTask& task) {
PendingTasksList* tasks_list = NULL;
PendingTasksKey key(profile, extension_id);
PendingTasksMap::iterator it = pending_tasks_.find(key);
if (it == pending_tasks_.end()) {
tasks_list = new PendingTasksList();
pending_tasks_[key] = linked_ptr<PendingTasksList>(tasks_list);
// If this is the first enqueued task, ensure the background page
// is loaded.
const Extension* extension = profile->GetExtensionService()->
extensions()->GetByID(extension_id);
DCHECK(extension->has_lazy_background_page());
ExtensionProcessManager* pm = profile->GetExtensionProcessManager();
pm->IncrementLazyKeepaliveCount(extension);
pm->CreateBackgroundHost(extension, extension->GetBackgroundURL());
} else {
tasks_list = it->second.get();
}
tasks_list->push_back(task);
}
void LazyBackgroundTaskQueue::ProcessPendingTasks(ExtensionHost* host) {
PendingTasksKey key(host->profile(), host->extension()->id());
PendingTasksMap::iterator map_it = pending_tasks_.find(key);
if (map_it == pending_tasks_.end()) {
NOTREACHED(); // lazy page should not load without any pending tasks
return;
}
PendingTasksList* tasks = map_it->second.get();
for (PendingTasksList::const_iterator it = tasks->begin();
it != tasks->end(); ++it) {
it->Run(host);
}
tasks->clear();
pending_tasks_.erase(map_it);
// Balance the keepalive in AddPendingTask.
host->profile()->GetExtensionProcessManager()->
DecrementLazyKeepaliveCount(host->extension());
}
void LazyBackgroundTaskQueue::Observe(
int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) {
switch (type) {
case chrome::NOTIFICATION_EXTENSION_HOST_DID_STOP_LOADING: {
// If an on-demand background page finished loading, dispatch queued up
// events for it.
ExtensionHost* host = content::Details<ExtensionHost>(details).ptr();
if (host->profile()->IsSameProfile(profile_) &&
host->extension_host_type() ==
chrome::VIEW_TYPE_EXTENSION_BACKGROUND_PAGE &&
host->extension()->has_lazy_background_page()) {
CHECK(host->did_stop_loading());
ProcessPendingTasks(host);
}
break;
}
case chrome::NOTIFICATION_EXTENSION_UNLOADED: {
// Clear pending tasks for this extension.
Profile* profile = content::Source<Profile>(source).ptr();
UnloadedExtensionInfo* unloaded =
content::Details<UnloadedExtensionInfo>(details).ptr();
pending_tasks_.erase(PendingTasksKey(
profile, unloaded->extension->id()));
if (profile->HasOffTheRecordProfile())
pending_tasks_.erase(PendingTasksKey(
profile->GetOffTheRecordProfile(), unloaded->extension->id()));
break;
}
default:
NOTREACHED();
break;
}
}
} // namespace extensions
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