chrome/browser/sync/glue/browser_thread_model_worker.h

   1 // Copyright (c) 2012 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 #ifndef CHROME_BROWSER_SYNC_GLUE_BROWSER_THREAD_MODEL_WORKER_H_
   6 #define CHROME_BROWSER_SYNC_GLUE_BROWSER_THREAD_MODEL_WORKER_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/callback_forward.h"
  10 #include "base/compiler_specific.h"
  11 #include "content/public/browser/browser_thread.h"
  12 #include "sync/internal_api/public/engine/model_safe_worker.h"
  13 #include "sync/internal_api/public/util/syncer_error.h"
  14
  15 namespace base {
  16 class WaitableEvent;
  17 }
  18
  19 namespace browser_sync {
  20
  21 // A syncer::ModelSafeWorker for models that accept requests from the
  22 // syncapi that need to be fulfilled on a browser thread, for example
  23 // autofill on the DB thread.
  24 // TODO(sync): Try to generalize other ModelWorkers (e.g. history, etc).
  25 class BrowserThreadModelWorker : public syncer::ModelSafeWorker {
  26  public:
  27   BrowserThreadModelWorker(content::BrowserThread::ID thread,
  28                            syncer::ModelSafeGroup group,
  29                            syncer::WorkerLoopDestructionObserver* observer);
  30
  31   // syncer::ModelSafeWorker implementation. Called on the sync thread.
  32   void RegisterForLoopDestruction() override;
  33   syncer::ModelSafeGroup GetModelSafeGroup() override;
  34
  35  protected:
  36   ~BrowserThreadModelWorker() override;
  37
  38   syncer::SyncerError DoWorkAndWaitUntilDoneImpl(
  39       const syncer::WorkCallback& work) override;
  40
  41   // Marked pure virtual so subclasses have to override, but there is
  42   // an implementation that subclasses should use.  This is so that
  43   // (subclass)::CallDoWorkAndSignalTask shows up in callstacks.
  44   virtual void CallDoWorkAndSignalTask(
  45       const syncer::WorkCallback& work,
  46       base::WaitableEvent* done,
  47       syncer::SyncerError* error) = 0;
  48
  49  private:
  50   content::BrowserThread::ID thread_;
  51   syncer::ModelSafeGroup group_;
  52
  53   DISALLOW_COPY_AND_ASSIGN(BrowserThreadModelWorker);
  54 };
  55
  56 // Subclass BrowserThreadModelWorker so that we can distinguish them
  57 // from stack traces alone.
  58
  59 class DatabaseModelWorker : public BrowserThreadModelWorker {
  60  public:
  61   explicit DatabaseModelWorker(syncer::WorkerLoopDestructionObserver* observer);
  62
  63  protected:
  64   void CallDoWorkAndSignalTask(const syncer::WorkCallback& work,
  65                                base::WaitableEvent* done,
  66                                syncer::SyncerError* error) override;
  67
  68  private:
  69   ~DatabaseModelWorker() override;
  70 };
  71
  72 class FileModelWorker : public BrowserThreadModelWorker {
  73  public:
  74   explicit FileModelWorker(syncer::WorkerLoopDestructionObserver* observer);
  75
  76  protected:
  77   void CallDoWorkAndSignalTask(const syncer::WorkCallback& work,
  78                                base::WaitableEvent* done,
  79                                syncer::SyncerError* error) override;
  80
  81  private:
  82   ~FileModelWorker() override;
  83 };
  84
  85 }  // namespace browser_sync
  86
  87 #endif  // CHROME_BROWSER_SYNC_GLUE_BROWSER_THREAD_MODEL_WORKER_H_