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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_JS_CONTROLLER_H_ | |
6 #define SYNC_JS_JS_CONTROLLER_H_ | |
7 | |
8 // See README.js for design comments. | |
9 | |
10 #include <string> | |
11 | |
12 #include "sync/base/sync_export.h" | |
13 | |
14 namespace syncer { | |
15 | |
16 class JsEventHandler; | |
17 template <typename T> class WeakHandle; | |
18 | |
19 // An interface for objects that JsEventHandlers directly interact | |
20 // with. JsEventHandlers can add themselves to receive events and | |
21 // also send messages which will eventually reach the backend. | |
22 class SYNC_EXPORT JsController { | |
23 public: | |
24 // Adds an event handler which will start receiving JS events (not | |
25 // immediately, so this can be called in the handler's constructor). | |
26 // Multiple event handlers are supported, but each event handler | |
27 // must be added at most once. | |
28 // | |
29 // Ideally, we'd take WeakPtrs, but we need the raw pointer values | |
30 // to be able to look them up for removal. | |
31 virtual void AddJsEventHandler(JsEventHandler* event_handler) = 0; | |
32 | |
33 // Removes the given event handler if it has been added. It will | |
34 // immediately stop receiving any JS events. | |
35 virtual void RemoveJsEventHandler(JsEventHandler* event_handler) = 0; | |
36 | |
37 protected: | |
38 virtual ~JsController() {} | |
39 }; | |
40 | |
41 } // namespace syncer | |
42 | |
43 #endif // SYNC_JS_JS_CONTROLLER_H_ | |
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