| // Copyright 2013 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 "extensions/browser/api/system_info/system_info_provider.h" |
| |
| #include "base/bind.h" |
| #include "base/task_runner_util.h" |
| #include "base/task_scheduler/post_task.h" |
| #include "base/task_scheduler/task_traits.h" |
| #include "content/public/browser/browser_thread.h" |
| |
| namespace extensions { |
| |
| SystemInfoProvider::SystemInfoProvider() |
| : is_waiting_for_completion_(false), |
| task_runner_(base::CreateSequencedTaskRunnerWithTraits( |
| {base::MayBlock(), |
| /* default priority, */ |
| base::TaskShutdownBehavior::SKIP_ON_SHUTDOWN})) {} |
| |
| SystemInfoProvider::~SystemInfoProvider() { |
| } |
| |
| void SystemInfoProvider::PrepareQueryOnUIThread() { |
| } |
| |
| void SystemInfoProvider::InitializeProvider( |
| const base::Closure& do_query_info_callback) { |
| do_query_info_callback.Run(); |
| } |
| |
| void SystemInfoProvider::StartQueryInfo( |
| const QueryInfoCompletionCallback& callback) { |
| DCHECK_CURRENTLY_ON(content::BrowserThread::UI); |
| DCHECK(!callback.is_null()); |
| |
| callbacks_.push(callback); |
| |
| if (is_waiting_for_completion_) |
| return; |
| |
| is_waiting_for_completion_ = true; |
| |
| InitializeProvider( |
| base::Bind(&SystemInfoProvider::StartQueryInfoPostInitialization, this)); |
| } |
| |
| void SystemInfoProvider::OnQueryCompleted(bool success) { |
| DCHECK_CURRENTLY_ON(content::BrowserThread::UI); |
| |
| while (!callbacks_.empty()) { |
| QueryInfoCompletionCallback callback = callbacks_.front(); |
| callback.Run(success); |
| callbacks_.pop(); |
| } |
| |
| is_waiting_for_completion_ = false; |
| } |
| |
| void SystemInfoProvider::StartQueryInfoPostInitialization() { |
| PrepareQueryOnUIThread(); |
| // Post the custom query info task to blocking pool for information querying |
| // and reply with OnQueryCompleted. |
| base::PostTaskAndReplyWithResult( |
| task_runner_.get(), FROM_HERE, |
| base::Bind(&SystemInfoProvider::QueryInfo, this), |
| base::Bind(&SystemInfoProvider::OnQueryCompleted, this)); |
| } |
| |
| } // namespace extensions |