src/chrome/browser/sync_file_system/drive_backend/sync_task_manager.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 "chrome/browser/sync_file_system/drive_backend/sync_task_manager.h"
   6
   7 #include "base/bind.h"
   8 #include "base/location.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "base/sequenced_task_runner.h"
  11 #include "chrome/browser/sync_file_system/drive_backend/sync_task.h"
  12 #include "chrome/browser/sync_file_system/drive_backend/sync_task_token.h"
  13 #include "chrome/browser/sync_file_system/sync_file_metadata.h"
  14
  15 using fileapi::FileSystemURL;
  16
  17 namespace sync_file_system {
  18 namespace drive_backend {
  19
  20 namespace {
  21
  22 class SyncTaskAdapter : public ExclusiveTask {
  23  public:
  24   explicit SyncTaskAdapter(const SyncTaskManager::Task& task) : task_(task) {}
  25   virtual ~SyncTaskAdapter() {}
  26
  27   virtual void RunExclusive(const SyncStatusCallback& callback) OVERRIDE {
  28     task_.Run(callback);
  29   }
  30
  31  private:
  32   SyncTaskManager::Task task_;
  33
  34   DISALLOW_COPY_AND_ASSIGN(SyncTaskAdapter);
  35 };
  36
  37 }  // namespace
  38
  39 SyncTaskManager::PendingTask::PendingTask() {}
  40
  41 SyncTaskManager::PendingTask::PendingTask(
  42     const base::Closure& task, Priority pri, int seq)
  43     : task(task), priority(pri), seq(seq) {}
  44
  45 SyncTaskManager::PendingTask::~PendingTask() {}
  46
  47 bool SyncTaskManager::PendingTaskComparator::operator()(
  48     const PendingTask& left,
  49     const PendingTask& right) const {
  50   if (left.priority != right.priority)
  51     return left.priority < right.priority;
  52   return left.seq > right.seq;
  53 }
  54
  55 SyncTaskManager::SyncTaskManager(
  56     base::WeakPtr<Client> client,
  57     size_t maximum_background_task,
  58     base::SequencedTaskRunner* task_runner)
  59     : client_(client),
  60       maximum_background_task_(maximum_background_task),
  61       pending_task_seq_(0),
  62       task_token_seq_(SyncTaskToken::kMinimumBackgroundTaskTokenID),
  63       task_runner_(task_runner) {
  64 }
  65
  66 SyncTaskManager::~SyncTaskManager() {
  67   client_.reset();
  68   token_.reset();
  69 }
  70
  71 void SyncTaskManager::Initialize(SyncStatusCode status) {
  72   DCHECK(sequence_checker_.CalledOnValidSequencedThread());
  73   DCHECK(!token_);
  74   NotifyTaskDone(
  75       SyncTaskToken::CreateForForegroundTask(AsWeakPtr(), task_runner_),
  76       status);
  77 }
  78
  79 void SyncTaskManager::ScheduleTask(
  80     const tracked_objects::Location& from_here,
  81     const Task& task,
  82     Priority priority,
  83     const SyncStatusCallback& callback) {
  84   DCHECK(sequence_checker_.CalledOnValidSequencedThread());
  85
  86   ScheduleSyncTask(from_here,
  87                    scoped_ptr<SyncTask>(new SyncTaskAdapter(task)),
  88                    priority,
  89                    callback);
  90 }
  91
  92 void SyncTaskManager::ScheduleSyncTask(
  93     const tracked_objects::Location& from_here,
  94     scoped_ptr<SyncTask> task,
  95     Priority priority,
  96     const SyncStatusCallback& callback) {
  97   DCHECK(sequence_checker_.CalledOnValidSequencedThread());
  98
  99   scoped_ptr<SyncTaskToken> token(GetToken(from_here, callback));
 100   if (!token) {
 101     PushPendingTask(
 102         base::Bind(&SyncTaskManager::ScheduleSyncTask, AsWeakPtr(), from_here,
 103                    base::Passed(&task), priority, callback),
 104         priority);
 105     return;
 106   }
 107   RunTask(token.Pass(), task.Pass());
 108 }
 109
 110 bool SyncTaskManager::ScheduleTaskIfIdle(
 111         const tracked_objects::Location& from_here,
 112         const Task& task,
 113         const SyncStatusCallback& callback) {
 114   DCHECK(sequence_checker_.CalledOnValidSequencedThread());
 115
 116   return ScheduleSyncTaskIfIdle(
 117       from_here,
 118       scoped_ptr<SyncTask>(new SyncTaskAdapter(task)),
 119       callback);
 120 }
 121
 122 bool SyncTaskManager::ScheduleSyncTaskIfIdle(
 123     const tracked_objects::Location& from_here,
 124     scoped_ptr<SyncTask> task,
 125     const SyncStatusCallback& callback) {
 126   DCHECK(sequence_checker_.CalledOnValidSequencedThread());
 127
 128   scoped_ptr<SyncTaskToken> token(GetToken(from_here, callback));
 129   if (!token)
 130     return false;
 131   RunTask(token.Pass(), task.Pass());
 132   return true;
 133 }
 134
 135 // static
 136 void SyncTaskManager::NotifyTaskDone(scoped_ptr<SyncTaskToken> token,
 137                                      SyncStatusCode status) {
 138   DCHECK(token);
 139
 140   SyncTaskManager* manager = token->manager();
 141   if (token->token_id() == SyncTaskToken::kTestingTaskTokenID) {
 142     DCHECK(!manager);
 143     SyncStatusCallback callback = token->callback();
 144     token->clear_callback();
 145     callback.Run(status);
 146     return;
 147   }
 148
 149   if (manager)
 150     manager->NotifyTaskDoneBody(token.Pass(), status);
 151 }
 152
 153 // static
 154 void SyncTaskManager::UpdateBlockingFactor(
 155     scoped_ptr<SyncTaskToken> current_task_token,
 156     scoped_ptr<BlockingFactor> blocking_factor,
 157     const Continuation& continuation) {
 158   DCHECK(current_task_token);
 159
 160   SyncTaskManager* manager = current_task_token->manager();
 161   if (current_task_token->token_id() == SyncTaskToken::kTestingTaskTokenID) {
 162     DCHECK(!manager);
 163     continuation.Run(current_task_token.Pass());
 164     return;
 165   }
 166
 167   if (!manager)
 168     return;
 169
 170   scoped_ptr<SyncTaskToken> foreground_task_token;
 171   scoped_ptr<SyncTaskToken> background_task_token;
 172   scoped_ptr<TaskLogger::TaskLog> task_log = current_task_token->PassTaskLog();
 173   if (current_task_token->token_id() == SyncTaskToken::kForegroundTaskTokenID)
 174     foreground_task_token = current_task_token.Pass();
 175   else
 176     background_task_token = current_task_token.Pass();
 177
 178   manager->UpdateBlockingFactorBody(foreground_task_token.Pass(),
 179                                     background_task_token.Pass(),
 180                                     task_log.Pass(),
 181                                     blocking_factor.Pass(),
 182                                     continuation);
 183 }
 184
 185 bool SyncTaskManager::IsRunningTask(int64 token_id) const {
 186   DCHECK(sequence_checker_.CalledOnValidSequencedThread());
 187
 188   // If the client is gone, all task should be aborted.
 189   if (!client_)
 190     return false;
 191
 192   if (token_id == SyncTaskToken::kForegroundTaskTokenID)
 193     return true;
 194
 195   return ContainsKey(running_background_tasks_, token_id);
 196 }
 197
 198 void SyncTaskManager::DetachFromSequence() {
 199   sequence_checker_.DetachFromSequence();
 200 }
 201
 202 void SyncTaskManager::NotifyTaskDoneBody(scoped_ptr<SyncTaskToken> token,
 203                                          SyncStatusCode status) {
 204   DCHECK(sequence_checker_.CalledOnValidSequencedThread());
 205   DCHECK(token);
 206
 207   DVLOG(3) << "NotifyTaskDone: " << "finished with status=" << status
 208            << " (" << SyncStatusCodeToString(status) << ")"
 209            << " " << token_->location().ToString();
 210
 211   if (token->blocking_factor()) {
 212     dependency_manager_.Erase(token->blocking_factor());
 213     token->clear_blocking_factor();
 214   }
 215
 216   if (client_) {
 217     if (token->has_task_log()) {
 218       token->FinalizeTaskLog(SyncStatusCodeToString(status));
 219       client_->RecordTaskLog(token->PassTaskLog());
 220     }
 221   }
 222
 223   scoped_ptr<SyncTask> task;
 224   SyncStatusCallback callback = token->callback();
 225   token->clear_callback();
 226   if (token->token_id() == SyncTaskToken::kForegroundTaskTokenID) {
 227     token_ = token.Pass();
 228     task = running_foreground_task_.Pass();
 229   } else {
 230     task = running_background_tasks_.take_and_erase(token->token_id());
 231   }
 232
 233   // Acquire the token to prevent a new task to jump into the queue.
 234   token = token_.Pass();
 235
 236   bool task_used_network = false;
 237   if (task)
 238     task_used_network = task->used_network();
 239
 240   if (client_)
 241     client_->NotifyLastOperationStatus(status, task_used_network);
 242
 243   if (!callback.is_null())
 244     callback.Run(status);
 245
 246   // Post MaybeStartNextForegroundTask rather than calling it directly to avoid
 247   // making the call-chaing longer.
 248   task_runner_->PostTask(
 249       FROM_HERE,
 250       base::Bind(&SyncTaskManager::MaybeStartNextForegroundTask,
 251                  AsWeakPtr(), base::Passed(&token)));
 252 }
 253
 254 void SyncTaskManager::UpdateBlockingFactorBody(
 255     scoped_ptr<SyncTaskToken> foreground_task_token,
 256     scoped_ptr<SyncTaskToken> background_task_token,
 257     scoped_ptr<TaskLogger::TaskLog> task_log,
 258     scoped_ptr<BlockingFactor> blocking_factor,
 259     const Continuation& continuation) {
 260   DCHECK(sequence_checker_.CalledOnValidSequencedThread());
 261
 262   // Run the task directly if the parallelization is disabled.
 263   if (!maximum_background_task_) {
 264     DCHECK(foreground_task_token);
 265     DCHECK(!background_task_token);
 266     foreground_task_token->SetTaskLog(task_log.Pass());
 267     continuation.Run(foreground_task_token.Pass());
 268     return;
 269   }
 270
 271   // Clear existing |blocking_factor| from |dependency_manager_| before
 272   // getting |foreground_task_token|, so that we can avoid dead lock.
 273   if (background_task_token && background_task_token->blocking_factor()) {
 274     dependency_manager_.Erase(background_task_token->blocking_factor());
 275     background_task_token->clear_blocking_factor();
 276   }
 277
 278   // Try to get |foreground_task_token|.  If it's not available, wait for
 279   // current foreground task to finish.
 280   if (!foreground_task_token) {
 281     DCHECK(background_task_token);
 282     foreground_task_token = GetToken(background_task_token->location(),
 283                                      SyncStatusCallback());
 284     if (!foreground_task_token) {
 285       PushPendingTask(
 286           base::Bind(&SyncTaskManager::UpdateBlockingFactorBody,
 287                      AsWeakPtr(),
 288                      base::Passed(&foreground_task_token),
 289                      base::Passed(&background_task_token),
 290                      base::Passed(&task_log),
 291                      base::Passed(&blocking_factor),
 292                      continuation),
 293           PRIORITY_HIGH);
 294       MaybeStartNextForegroundTask(scoped_ptr<SyncTaskToken>());
 295       return;
 296     }
 297   }
 298
 299   // Check if the task can run as a background task now.
 300   // If there are too many task running or any other task blocks current
 301   // task, wait for any other task to finish.
 302   bool task_number_limit_exceeded =
 303       !background_task_token &&
 304       running_background_tasks_.size() >= maximum_background_task_;
 305   if (task_number_limit_exceeded ||
 306       !dependency_manager_.Insert(blocking_factor.get())) {
 307     DCHECK(!running_background_tasks_.empty());
 308     DCHECK(pending_backgrounding_task_.is_null());
 309
 310     // Wait for NotifyTaskDone to release a |blocking_factor|.
 311     pending_backgrounding_task_ =
 312         base::Bind(&SyncTaskManager::UpdateBlockingFactorBody,
 313                    AsWeakPtr(),
 314                    base::Passed(&foreground_task_token),
 315                    base::Passed(&background_task_token),
 316                    base::Passed(&task_log),
 317                    base::Passed(&blocking_factor),
 318                    continuation);
 319     return;
 320   }
 321
 322   if (background_task_token) {
 323     background_task_token->set_blocking_factor(blocking_factor.Pass());
 324   } else {
 325     tracked_objects::Location from_here = foreground_task_token->location();
 326     SyncStatusCallback callback = foreground_task_token->callback();
 327     foreground_task_token->clear_callback();
 328
 329     background_task_token =
 330         SyncTaskToken::CreateForBackgroundTask(
 331             AsWeakPtr(),
 332             task_runner_,
 333             task_token_seq_++,
 334             blocking_factor.Pass());
 335     background_task_token->UpdateTask(from_here, callback);
 336     running_background_tasks_.set(background_task_token->token_id(),
 337                                   running_foreground_task_.Pass());
 338   }
 339
 340   token_ = foreground_task_token.Pass();
 341   MaybeStartNextForegroundTask(scoped_ptr<SyncTaskToken>());
 342   background_task_token->SetTaskLog(task_log.Pass());
 343   continuation.Run(background_task_token.Pass());
 344 }
 345
 346 scoped_ptr<SyncTaskToken> SyncTaskManager::GetToken(
 347     const tracked_objects::Location& from_here,
 348     const SyncStatusCallback& callback) {
 349   DCHECK(sequence_checker_.CalledOnValidSequencedThread());
 350
 351   if (!token_)
 352     return scoped_ptr<SyncTaskToken>();
 353   token_->UpdateTask(from_here, callback);
 354   return token_.Pass();
 355 }
 356
 357 void SyncTaskManager::PushPendingTask(
 358     const base::Closure& closure, Priority priority) {
 359   DCHECK(sequence_checker_.CalledOnValidSequencedThread());
 360
 361   pending_tasks_.push(PendingTask(closure, priority, pending_task_seq_++));
 362 }
 363
 364 void SyncTaskManager::RunTask(scoped_ptr<SyncTaskToken> token,
 365                               scoped_ptr<SyncTask> task) {
 366   DCHECK(sequence_checker_.CalledOnValidSequencedThread());
 367   DCHECK(!running_foreground_task_);
 368
 369   running_foreground_task_ = task.Pass();
 370   running_foreground_task_->RunPreflight(token.Pass());
 371 }
 372
 373 void SyncTaskManager::MaybeStartNextForegroundTask(
 374     scoped_ptr<SyncTaskToken> token) {
 375   DCHECK(sequence_checker_.CalledOnValidSequencedThread());
 376
 377   if (token) {
 378     DCHECK(!token_);
 379     token_ = token.Pass();
 380   }
 381
 382   if (!pending_backgrounding_task_.is_null()) {
 383     base::Closure closure = pending_backgrounding_task_;
 384     pending_backgrounding_task_.Reset();
 385     closure.Run();
 386     return;
 387   }
 388
 389   if (!token_)
 390     return;
 391
 392   if (!pending_tasks_.empty()) {
 393     base::Closure closure = pending_tasks_.top().task;
 394     pending_tasks_.pop();
 395     closure.Run();
 396     return;
 397   }
 398
 399   if (client_)
 400     client_->MaybeScheduleNextTask();
 401 }
 402
 403 }  // namespace drive_backend
 404 }  // namespace sync_file_system