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 #include "sync/js/sync_js_controller.h" 6 7 #include "base/location.h" 8 #include "sync/js/js_backend.h" 9 #include "sync/js/js_event_details.h" 10 11 namespace syncer { 12 13 SyncJsController::SyncJsController() {} 14 15 SyncJsController::~SyncJsController() { 16 AttachJsBackend(WeakHandle<JsBackend>()); 17 } 18 19 void SyncJsController::AddJsEventHandler(JsEventHandler* event_handler) { 20 js_event_handlers_.AddObserver(event_handler); 21 UpdateBackendEventHandler(); 22 } 23 24 void SyncJsController::RemoveJsEventHandler(JsEventHandler* event_handler) { 25 js_event_handlers_.RemoveObserver(event_handler); 26 UpdateBackendEventHandler(); 27 } 28 29 void SyncJsController::AttachJsBackend( 30 const WeakHandle<JsBackend>& js_backend) { 31 js_backend_ = js_backend; 32 UpdateBackendEventHandler(); 33 } 34 35 void SyncJsController::HandleJsEvent(const std::string& name, 36 const JsEventDetails& details) { 37 FOR_EACH_OBSERVER(JsEventHandler, js_event_handlers_, 38 HandleJsEvent(name, details)); 39 } 40 41 void SyncJsController::UpdateBackendEventHandler() { 42 if (js_backend_.IsInitialized()) { 43 // To avoid making the backend send useless events, we clear the 44 // event handler we pass to it if we don't have any event 45 // handlers. 46 WeakHandle<JsEventHandler> backend_event_handler = 47 js_event_handlers_.might_have_observers() ? 48 MakeWeakHandle(AsWeakPtr()) : WeakHandle<SyncJsController>(); 49 js_backend_.Call(FROM_HERE, &JsBackend::SetJsEventHandler, 50 backend_event_handler); 51 } 52 } 53 54 } // namespace syncer 55
