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// Copyright (c) 2011 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 CHROME_BROWSER_SYNC_JS_EVENT_HANDLER_LIST_H_
#define CHROME_BROWSER_SYNC_JS_EVENT_HANDLER_LIST_H_
#pragma once
#include <string>
#include <vector>
#include "base/basictypes.h"
#include "base/observer_list.h"
#include "chrome/browser/sync/js_arg_list.h"
#include "chrome/browser/sync/js_event_router.h"
#include "chrome/browser/sync/js_frontend.h"
namespace browser_sync {
class JsBackend;
class JsEventHandler;
// A beefed-up ObserverList<JsEventHandler> that transparently handles
// the communication between the handlers and a backend.
class JsEventHandlerList : public JsFrontend, public JsEventRouter {
public:
JsEventHandlerList();
virtual ~JsEventHandlerList();
// Sets the backend to route all messages to. Should be called only
// if a backend has not already been set.
void SetBackend(JsBackend* backend);
// Removes any existing backend.
void RemoveBackend();
// JsFrontend implementation. Routes messages to any attached
// backend; if there is none, queues up the message for processing
// when the next backend is attached.
virtual void AddHandler(JsEventHandler* handler);
virtual void RemoveHandler(JsEventHandler* handler);
virtual void ProcessMessage(
const std::string& name, const JsArgList& args,
const JsEventHandler* sender);
// JsEventRouter implementation. Routes the event to the
// appropriate handler(s).
virtual void RouteJsEvent(const std::string& name,
const JsArgList& args,
const JsEventHandler* target);
private:
// A struct used to hold the arguments to ProcessMessage() for
// future invocation.
struct PendingMessage {
std::string name;
JsArgList args;
const JsEventHandler* sender;
PendingMessage(const std::string& name, const JsArgList& args,
const JsEventHandler* sender);
};
typedef std::vector<PendingMessage> PendingMessageList;
JsBackend* backend_;
ObserverList<JsEventHandler> handlers_;
PendingMessageList pending_messages_;
DISALLOW_COPY_AND_ASSIGN(JsEventHandlerList);
};
} // namespace browser_sync
#endif // CHROME_BROWSER_SYNC_JS_EVENT_HANDLER_LIST_H_
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