1 // Copyright 2013 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/api/system_info/system_info_provider.h" 6 7 #include "base/bind.h" 8 #include "content/public/browser/browser_thread.h" 9 10 namespace extensions { 11 12 SystemInfoProvider::SystemInfoProvider() : is_waiting_for_completion_(false) { 13 base::SequencedWorkerPool* pool = content::BrowserThread::GetBlockingPool(); 14 worker_pool_ = pool->GetSequencedTaskRunnerWithShutdownBehavior( 15 pool->GetSequenceToken(), 16 base::SequencedWorkerPool::CONTINUE_ON_SHUTDOWN); 17 } 18 19 SystemInfoProvider::~SystemInfoProvider() { 20 } 21 22 void SystemInfoProvider::PrepareQueryOnUIThread() { 23 } 24 25 void SystemInfoProvider::InitializeProvider( 26 const base::Closure& do_query_info_callback) { 27 do_query_info_callback.Run(); 28 } 29 30 void SystemInfoProvider::StartQueryInfo( 31 const QueryInfoCompletionCallback& callback) { 32 DCHECK_CURRENTLY_ON(content::BrowserThread::UI); 33 DCHECK(!callback.is_null()); 34 35 callbacks_.push(callback); 36 37 if (is_waiting_for_completion_) 38 return; 39 40 is_waiting_for_completion_ = true; 41 42 InitializeProvider( 43 base::Bind(&SystemInfoProvider::StartQueryInfoPostInitialization, this)); 44 } 45 46 void SystemInfoProvider::OnQueryCompleted(bool success) { 47 DCHECK_CURRENTLY_ON(content::BrowserThread::UI); 48 49 while (!callbacks_.empty()) { 50 QueryInfoCompletionCallback callback = callbacks_.front(); 51 callback.Run(success); 52 callbacks_.pop(); 53 } 54 55 is_waiting_for_completion_ = false; 56 } 57 58 void SystemInfoProvider::StartQueryInfoPostInitialization() { 59 PrepareQueryOnUIThread(); 60 // Post the custom query info task to blocking pool for information querying 61 // and reply with OnQueryCompleted. 62 base::PostTaskAndReplyWithResult( 63 worker_pool_.get(), 64 FROM_HERE, 65 base::Bind(&SystemInfoProvider::QueryInfo, this), 66 base::Bind(&SystemInfoProvider::OnQueryCompleted, this)); 67 } 68 69 } // namespace extensions 70
