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// 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 "sync/js/sync_js_controller.h"
#include "base/location.h"
#include "sync/js/js_backend.h"
#include "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_EACH_OBSERVER(JsEventHandler, js_event_handlers_,
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
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