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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.
#ifndef SYNC_JS_SYNC_JS_CONTROLLER_H_
#define SYNC_JS_SYNC_JS_CONTROLLER_H_
#pragma once
#include <string>
#include <vector>
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/memory/weak_ptr.h"
#include "base/observer_list.h"
#include "sync/internal_api/public/util/weak_handle.h"
#include "sync/js/js_arg_list.h"
#include "sync/js/js_controller.h"
#include "sync/js/js_event_handler.h"
namespace csync {
class JsBackend;
// A class that mediates between the sync JsEventHandlers and the sync
// JsBackend.
class SyncJsController
: public JsController, public JsEventHandler,
public base::SupportsWeakPtr<SyncJsController> {
public:
SyncJsController();
virtual ~SyncJsController();
// Sets the backend to route all messages to (if initialized).
// Sends any queued-up messages if |backend| is initialized.
void AttachJsBackend(const WeakHandle<JsBackend>& js_backend);
// JsController implementation.
virtual void AddJsEventHandler(JsEventHandler* event_handler) OVERRIDE;
virtual void RemoveJsEventHandler(JsEventHandler* event_handler) OVERRIDE;
// Queues up any messages that are sent when there is no attached
// initialized backend.
virtual void ProcessJsMessage(
const std::string& name, const JsArgList& args,
const WeakHandle<JsReplyHandler>& reply_handler) OVERRIDE;
// JsEventHandler implementation.
virtual void HandleJsEvent(const std::string& name,
const JsEventDetails& details) OVERRIDE;
private:
// A struct used to hold the arguments to ProcessJsMessage() for
// future invocation.
struct PendingJsMessage {
std::string name;
JsArgList args;
WeakHandle<JsReplyHandler> reply_handler;
PendingJsMessage(const std::string& name, const JsArgList& args,
const WeakHandle<JsReplyHandler>& reply_handler);
~PendingJsMessage();
};
typedef std::vector<PendingJsMessage> PendingJsMessageList;
// Sets |js_backend_|'s event handler depending on how many
// underlying event handlers we have.
void UpdateBackendEventHandler();
WeakHandle<JsBackend> js_backend_;
ObserverList<JsEventHandler> js_event_handlers_;
PendingJsMessageList pending_js_messages_;
DISALLOW_COPY_AND_ASSIGN(SyncJsController);
};
} // namespace csync
#endif // SYNC_JS_SYNC_JS_CONTROLLER_H_
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