| // 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::PendingJsMessage::PendingJsMessage( |
| const std::string& name, const JsArgList& args, |
| const WeakHandle<JsReplyHandler>& reply_handler) |
| : name(name), args(args), reply_handler(reply_handler) {} |
| |
| SyncJsController::PendingJsMessage::~PendingJsMessage() {} |
| |
| 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(); |
| |
| if (js_backend_.IsInitialized()) { |
| // Process any queued messages. |
| for (PendingJsMessageList::const_iterator it = |
| pending_js_messages_.begin(); |
| it != pending_js_messages_.end(); ++it) { |
| js_backend_.Call(FROM_HERE, &JsBackend::ProcessJsMessage, |
| it->name, it->args, it->reply_handler); |
| } |
| } |
| } |
| |
| void SyncJsController::ProcessJsMessage( |
| const std::string& name, const JsArgList& args, |
| const WeakHandle<JsReplyHandler>& reply_handler) { |
| if (js_backend_.IsInitialized()) { |
| js_backend_.Call(FROM_HERE, &JsBackend::ProcessJsMessage, |
| name, args, reply_handler); |
| } else { |
| pending_js_messages_.push_back( |
| PendingJsMessage(name, args, reply_handler)); |
| } |
| } |
| |
| 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 |