| // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "components/sync/js/sync_js_controller.h" |
| |
| #include "base/location.h" |
| #include "components/sync/js/js_backend.h" |
| #include "components/sync/js/js_event_details.h" |
| |
| namespace syncer { |
| |
| SyncJsController::SyncJsController() {} |
| |
| SyncJsController::~SyncJsController() { |
| AttachJsBackend(WeakHandle<JsBackend>()); |
| } |
| |
| void SyncJsController::AddJsEventHandler(JsEventHandler* event_handler) { |
| js_event_handlers_.AddObserver(event_handler); |
| UpdateBackendEventHandler(); |
| } |
| |
| void SyncJsController::RemoveJsEventHandler(JsEventHandler* event_handler) { |
| js_event_handlers_.RemoveObserver(event_handler); |
| UpdateBackendEventHandler(); |
| } |
| |
| void SyncJsController::AttachJsBackend( |
| const WeakHandle<JsBackend>& js_backend) { |
| js_backend_ = js_backend; |
| UpdateBackendEventHandler(); |
| } |
| |
| void SyncJsController::HandleJsEvent(const std::string& name, |
| const JsEventDetails& details) { |
| for (auto& observer : js_event_handlers_) |
| observer.HandleJsEvent(name, details); |
| } |
| |
| void SyncJsController::UpdateBackendEventHandler() { |
| if (js_backend_.IsInitialized()) { |
| // To avoid making the backend send useless events, we clear the |
| // event handler we pass to it if we don't have any event |
| // handlers. |
| WeakHandle<JsEventHandler> backend_event_handler = |
| js_event_handlers_.might_have_observers() |
| ? MakeWeakHandle(AsWeakPtr()) |
| : WeakHandle<SyncJsController>(); |
| js_backend_.Call(FROM_HERE, &JsBackend::SetJsEventHandler, |
| backend_event_handler); |
| } |
| } |
| |
| } // namespace syncer |