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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/compiler_specific.h" | |
12 #include "base/macros.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 ~SyncJsController() override; | |
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 void AddJsEventHandler(JsEventHandler* event_handler) override; | |
40 void RemoveJsEventHandler(JsEventHandler* event_handler) override; | |
41 | |
42 // JsEventHandler implementation. | |
43 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 base::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_ | |
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