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      1 // Copyright 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 SYNC_JS_SYNC_JS_CONTROLLER_H_
      6 #define SYNC_JS_SYNC_JS_CONTROLLER_H_
      7 
      8 #include <string>
      9 #include <vector>
     10 
     11 #include "base/basictypes.h"
     12 #include "base/compiler_specific.h"
     13 #include "base/memory/weak_ptr.h"
     14 #include "base/observer_list.h"
     15 #include "sync/base/sync_export.h"
     16 #include "sync/internal_api/public/util/weak_handle.h"
     17 #include "sync/js/js_controller.h"
     18 #include "sync/js/js_event_handler.h"
     19 
     20 namespace syncer {
     21 
     22 class JsBackend;
     23 
     24 // A class that mediates between the sync JsEventHandlers and the sync
     25 // JsBackend.
     26 class SYNC_EXPORT SyncJsController
     27     : public JsController, public JsEventHandler,
     28       public base::SupportsWeakPtr<SyncJsController> {
     29  public:
     30   SyncJsController();
     31 
     32   virtual ~SyncJsController();
     33 
     34   // Sets the backend to route all messages to (if initialized).
     35   // Sends any queued-up messages if |backend| is initialized.
     36   void AttachJsBackend(const WeakHandle<JsBackend>& js_backend);
     37 
     38   // JsController implementation.
     39   virtual void AddJsEventHandler(JsEventHandler* event_handler) OVERRIDE;
     40   virtual void RemoveJsEventHandler(JsEventHandler* event_handler) OVERRIDE;
     41 
     42   // JsEventHandler implementation.
     43   virtual void HandleJsEvent(const std::string& name,
     44                              const JsEventDetails& details) OVERRIDE;
     45 
     46  private:
     47   // Sets |js_backend_|'s event handler depending on how many
     48   // underlying event handlers we have.
     49   void UpdateBackendEventHandler();
     50 
     51   WeakHandle<JsBackend> js_backend_;
     52   ObserverList<JsEventHandler> js_event_handlers_;
     53 
     54   DISALLOW_COPY_AND_ASSIGN(SyncJsController);
     55 };
     56 
     57 }  // namespace syncer
     58 
     59 #endif  // SYNC_JS_SYNC_JS_CONTROLLER_H_
     60