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| 1 // Copyright (c) 2011 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_SYNC_JS_CONTROLLER_H_ | |
| 6 #define CHROME_BROWSER_SYNC_SYNC_JS_CONTROLLER_H_ | |
| 7 #pragma once | |
| 8 | |
| 9 #include <string> | |
| 10 #include <vector> | |
| 11 | |
| 12 #include "base/basictypes.h" | |
| 13 #include "base/compiler_specific.h" | |
| 14 #include "base/memory/weak_ptr.h" | |
| 15 #include "base/observer_list.h" | |
| 16 #include "chrome/browser/sync/js/js_arg_list.h" | |
| 17 #include "chrome/browser/sync/js/js_controller.h" | |
| 18 #include "chrome/browser/sync/js/js_event_handler.h" | |
| 19 #include "chrome/browser/sync/util/weak_handle.h" | |
| 20 | |
| 21 namespace browser_sync { | |
| 22 | |
| 23 class JsBackend; | |
| 24 | |
| 25 // A class that mediates between the sync JsEventHandlers and the sync | |
| 26 // JsBackend. | |
| 27 class SyncJsController | |
| 28 : public JsController, public JsEventHandler, | |
| 29 public base::SupportsWeakPtr<SyncJsController> { | |
| 30 public: | |
| 31 SyncJsController(); | |
| 32 | |
| 33 virtual ~SyncJsController(); | |
| 34 | |
| 35 // Sets the backend to route all messages to (if initialized). | |
| 36 // Sends any queued-up messages if |backend| is initialized. | |
| 37 void AttachJsBackend(const WeakHandle<JsBackend>& js_backend); | |
| 38 | |
| 39 // JsController implementation. | |
| 40 virtual void AddJsEventHandler(JsEventHandler* event_handler) OVERRIDE; | |
| 41 virtual void RemoveJsEventHandler(JsEventHandler* event_handler) OVERRIDE; | |
| 42 // Queues up any messages that are sent when there is no attached | |
| 43 // initialized backend. | |
| 44 virtual void ProcessJsMessage( | |
| 45 const std::string& name, const JsArgList& args, | |
| 46 const WeakHandle<JsReplyHandler>& reply_handler) OVERRIDE; | |
| 47 | |
| 48 // JsEventHandler implementation. | |
| 49 virtual void HandleJsEvent(const std::string& name, | |
| 50 const JsEventDetails& details) OVERRIDE; | |
| 51 | |
| 52 private: | |
| 53 // A struct used to hold the arguments to ProcessJsMessage() for | |
| 54 // future invocation. | |
| 55 struct PendingJsMessage { | |
| 56 std::string name; | |
| 57 JsArgList args; | |
| 58 WeakHandle<JsReplyHandler> reply_handler; | |
| 59 | |
| 60 PendingJsMessage(const std::string& name, const JsArgList& args, | |
| 61 const WeakHandle<JsReplyHandler>& reply_handler); | |
| 62 | |
| 63 ~PendingJsMessage(); | |
| 64 }; | |
| 65 | |
| 66 typedef std::vector<PendingJsMessage> PendingJsMessageList; | |
| 67 | |
| 68 // Sets |js_backend_|'s event handler depending on how many | |
| 69 // underlying event handlers we have. | |
| 70 void UpdateBackendEventHandler(); | |
| 71 | |
| 72 WeakHandle<JsBackend> js_backend_; | |
| 73 ObserverList<JsEventHandler> js_event_handlers_; | |
| 74 PendingJsMessageList pending_js_messages_; | |
| 75 | |
| 76 DISALLOW_COPY_AND_ASSIGN(SyncJsController); | |
| 77 }; | |
| 78 | |
| 79 } // namespace browser_sync | |
| 80 | |
| 81 #endif // CHROME_BROWSER_SYNC_SYNC_JS_CONTROLLER_H_ | |
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