Downloads: replace BrowserThread::FILE with task scheduler.

content/browser/download/save_file_manager.cc

 // 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 "build/build_config.h"
 
 #include "content/browser/download/save_file_manager.h"
 
 #include "base/bind.h"
 #include "base/files/file_util.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "base/strings/string_util.h"
 #include "base/threading/thread.h"
 #include "content/browser/child_process_security_policy_impl.h"
+#include "content/browser/download/download_task_runner.h"
 #include "content/browser/download/save_file.h"
 #include "content/browser/download/save_file_resource_handler.h"
 #include "content/browser/download/save_package.h"
 #include "content/browser/loader/resource_dispatcher_host_impl.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/resource_context.h"
 #include "content/public/common/previews_state.h"
@@ skipping 27 matching lines @@
 }
 
 // static
 SaveFileManager* SaveFileManager::Get() {
   return g_save_file_manager;
 }
 
 // Called during the browser shutdown process to clean up any state (open files,
 // timers) that live on the saving thread (file thread).
 void SaveFileManager::Shutdown() {
-  BrowserThread::PostTask(
-      BrowserThread::FILE, FROM_HERE,
-      base::Bind(&SaveFileManager::OnShutdown, this));
+  GetDownloadTaskRunner()->PostTask(
+      FROM_HERE, base::Bind(&SaveFileManager::OnShutdown, this));
 }
 
 // Stop file thread operations.
 void SaveFileManager::OnShutdown() {
-  DCHECK_CURRENTLY_ON(BrowserThread::FILE);
+  DCHECK(GetDownloadTaskRunner()->RunsTasksInCurrentSequence());
   save_file_map_.clear();
 }
 
 SaveFile* SaveFileManager::LookupSaveFile(SaveItemId save_item_id) {
-  DCHECK_CURRENTLY_ON(BrowserThread::FILE);
+  DCHECK(GetDownloadTaskRunner()->RunsTasksInCurrentSequence());
   auto it = save_file_map_.find(save_item_id);
   return it == save_file_map_.end() ? nullptr : it->second.get();
 }
 
 // Look up a SavePackage according to a save id.
 SavePackage* SaveFileManager::LookupPackage(SaveItemId save_item_id) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   auto it = packages_.find(save_item_id);
   if (it != packages_.end())
     return it->second;
@@ skipping 27 matching lines @@
                    save_item_id, save_package->id(), render_process_host_id,
                    render_view_routing_id, render_frame_routing_id, context));
   } else {
     // We manually start the save job.
     SaveFileCreateInfo* info = new SaveFileCreateInfo(
         file_full_path, url, save_item_id, save_package->id(),
         render_process_host_id, render_frame_routing_id, save_source);
 
     // Since the data will come from render process, so we need to start
     // this kind of save job by ourself.
-    BrowserThread::PostTask(
-        BrowserThread::FILE, FROM_HERE,
-        base::Bind(&SaveFileManager::StartSave, this, info));
+    GetDownloadTaskRunner()->PostTask(
+        FROM_HERE, base::Bind(&SaveFileManager::StartSave, this, info));
   }
 }
 
 // Utility function for look up table maintenance, called on the UI thread.
 // A manager may have multiple save page job (SavePackage) in progress,
 // so we just look up the save id and remove it from the tracking table.
 void SaveFileManager::RemoveSaveFile(SaveItemId save_item_id,
                                      SavePackage* save_package) {
   DCHECK(save_package);
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
@@ skipping 18 matching lines @@
           render_frame_host));
   if (!web_contents)
     return nullptr;
 
   return web_contents->save_package();
 }
 
 void SaveFileManager::DeleteDirectoryOrFile(const base::FilePath& full_path,
                                             bool is_dir) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
-  BrowserThread::PostTask(
-      BrowserThread::FILE, FROM_HERE,
-      base::Bind(&SaveFileManager::OnDeleteDirectoryOrFile,
-          this, full_path, is_dir));
+  GetDownloadTaskRunner()->PostTask(
+      FROM_HERE, base::Bind(&SaveFileManager::OnDeleteDirectoryOrFile, this,
+                            full_path, is_dir));
 }
 
 void SaveFileManager::SendCancelRequest(SaveItemId save_item_id) {
   // Cancel the request which has specific save id.
   DCHECK(!save_item_id.is_null());
-  BrowserThread::PostTask(
-      BrowserThread::FILE, FROM_HERE,
-      base::Bind(&SaveFileManager::CancelSave, this, save_item_id));
+  GetDownloadTaskRunner()->PostTask(
+      FROM_HERE, base::Bind(&SaveFileManager::CancelSave, this, save_item_id));
 }
 
 // Notifications sent from the IO thread and run on the file thread:
 
 // The IO thread created |info|, but the file thread (this method) uses it
 // to create a SaveFile which will hold and finally destroy |info|. It will
 // then passes |info| to the UI thread for reporting saving status.
 void SaveFileManager::StartSave(SaveFileCreateInfo* info) {
-  DCHECK_CURRENTLY_ON(BrowserThread::FILE);
+  DCHECK(GetDownloadTaskRunner()->RunsTasksInCurrentSequence());
   DCHECK(info);
   // No need to calculate hash.
   std::unique_ptr<SaveFile> save_file = base::MakeUnique<SaveFile>(info, false);
 
   // TODO(phajdan.jr): We should check the return value and handle errors here.
   save_file->Initialize();
   info->path = save_file->FullPath();
 
   DCHECK(!LookupSaveFile(info->save_item_id));
   save_file_map_[info->save_item_id] = std::move(save_file);
 
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
       base::Bind(&SaveFileManager::OnStartSave, this, *info));
 }
 
 // We do forward an update to the UI thread here, since we do not use timer to
 // update the UI. If the user has canceled the saving action (in the UI
 // thread). We may receive a few more updates before the IO thread gets the
 // cancel message. We just delete the data since the SaveFile has been deleted.
 void SaveFileManager::UpdateSaveProgress(SaveItemId save_item_id,
                                          net::IOBuffer* data,
                                          int data_len) {
-  DCHECK_CURRENTLY_ON(BrowserThread::FILE);
+  DCHECK(GetDownloadTaskRunner()->RunsTasksInCurrentSequence());
   SaveFile* save_file = LookupSaveFile(save_item_id);
   if (save_file) {
     DCHECK(save_file->InProgress());
 
     DownloadInterruptReason reason =
         save_file->AppendDataToFile(data->data(), data_len);
     BrowserThread::PostTask(
         BrowserThread::UI, FROM_HERE,
         base::Bind(&SaveFileManager::OnUpdateSaveProgress, this,
                    save_file->save_item_id(), save_file->BytesSoFar(),
                    reason == DOWNLOAD_INTERRUPT_REASON_NONE));
   }
 }
 
 // The IO thread will call this when saving is completed or it got error when
 // fetching data. We forward the message to OnSaveFinished in UI thread.
 void SaveFileManager::SaveFinished(SaveItemId save_item_id,
                                    SavePackageId save_package_id,
                                    bool is_success) {
   DVLOG(20) << __func__ << "() save_item_id = " << save_item_id
             << " save_package_id = " << save_package_id
             << " is_success = " << is_success;
-  DCHECK_CURRENTLY_ON(BrowserThread::FILE);
+  DCHECK(GetDownloadTaskRunner()->RunsTasksInCurrentSequence());
 
   int64_t bytes_so_far = 0;
   SaveFile* save_file = LookupSaveFile(save_item_id);
   if (save_file != nullptr) {
     DCHECK(save_file->InProgress());
     DVLOG(20) << __func__ << "() save_file = " << save_file->DebugString();
     bytes_so_far = save_file->BytesSoFar();
     save_file->Finish();
     save_file->Detach();
   } else {
@@ skipping 133 matching lines @@
 }
 
 // Notifications sent from the UI thread and run on the file thread.
 
 // This method will be sent via a user action, or shutdown on the UI thread,
 // and run on the file thread. We don't post a message back for cancels,
 // but we do forward the cancel to the IO thread. Since this message has been
 // sent from the UI thread, the saving job may have already completed and
 // won't exist in our map.
 void SaveFileManager::CancelSave(SaveItemId save_item_id) {
-  DCHECK_CURRENTLY_ON(BrowserThread::FILE);
+  DCHECK(GetDownloadTaskRunner()->RunsTasksInCurrentSequence());
   auto it = save_file_map_.find(save_item_id);
   if (it != save_file_map_.end()) {
     std::unique_ptr<SaveFile> save_file = std::move(it->second);
 
     if (!save_file->InProgress()) {
       // We've won a race with the UI thread--we finished the file before
       // the UI thread cancelled it on us.  Unfortunately, in this situation
       // the cancel wins, so we need to delete the now detached file.
       base::DeleteFile(save_file->FullPath(), false);
     } else if (save_file->save_source() ==
                SaveFileCreateInfo::SAVE_FILE_FROM_NET) {
       // If the data comes from the net IO thread and hasn't completed
       // yet, then forward the cancel message to IO thread & cancel the
       // save locally.  If the data doesn't come from the IO thread,
       // we can ignore the message.
       BrowserThread::PostTask(
           BrowserThread::IO, FROM_HERE,
           base::Bind(&SaveFileManager::ExecuteCancelSaveRequest, this,
               save_file->render_process_id(), save_file->request_id()));
     }
 
     // Whatever the save file is complete or not, just delete it.  This
     // will delete the underlying file if InProgress() is true.
     save_file_map_.erase(it);
   }
 }
 
 void SaveFileManager::OnDeleteDirectoryOrFile(const base::FilePath& full_path,
                                               bool is_dir) {
-  DCHECK_CURRENTLY_ON(BrowserThread::FILE);
+  DCHECK(GetDownloadTaskRunner()->RunsTasksInCurrentSequence());
   DCHECK(!full_path.empty());
 
   base::DeleteFile(full_path, is_dir);
 }
 
 void SaveFileManager::RenameAllFiles(const FinalNamesMap& final_names,
                                      const base::FilePath& resource_dir,
                                      int render_process_id,
                                      int render_frame_routing_id,
                                      SavePackageId save_package_id) {
-  DCHECK_CURRENTLY_ON(BrowserThread::FILE);
+  DCHECK(GetDownloadTaskRunner()->RunsTasksInCurrentSequence());
 
   if (!resource_dir.empty() && !base::PathExists(resource_dir))
     base::CreateDirectory(resource_dir);
 
   for (const auto& i : final_names) {
     SaveItemId save_item_id = i.first;
     const base::FilePath& final_name = i.second;
 
     auto it = save_file_map_.find(save_item_id);
     if (it != save_file_map_.end()) {
@@ skipping 17 matching lines @@
 
   SavePackage* save_package =
       GetSavePackageFromRenderIds(render_process_id, render_frame_routing_id);
 
   if (save_package && save_package->id() == save_package_id)
     save_package->Finish();
 }
 
 void SaveFileManager::RemoveSavedFileFromFileMap(
     const std::vector<SaveItemId>& save_item_ids) {
-  DCHECK_CURRENTLY_ON(BrowserThread::FILE);
+  DCHECK(GetDownloadTaskRunner()->RunsTasksInCurrentSequence());
 
   for (const SaveItemId save_item_id : save_item_ids) {
     auto it = save_file_map_.find(save_item_id);
     if (it != save_file_map_.end()) {
       SaveFile* save_file = it->second.get();
       DCHECK(!save_file->InProgress());
       base::DeleteFile(save_file->FullPath(), false);
       save_file_map_.erase(it);
     }
   }
 }
 
 }  // namespace content