// Copyright 2016 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 EXTENSIONS_RENDERER_WORKER_THREAD_DISPATCHER_H_
#define EXTENSIONS_RENDERER_WORKER_THREAD_DISPATCHER_H_

#include "base/synchronization/lock.h"
#include "content/public/renderer/render_thread_observer.h"
#include "ipc/ipc_sync_message_filter.h"

namespace base {
class ListValue;
}

namespace content {
class RenderThread;
}

namespace extensions {
class RequestSender;
class ServiceWorkerRequestSender;
class V8SchemaRegistry;

// Sends and receives IPC in an extension Service Worker.
// TODO(lazyboy): This class should really be a combination of the following
// two:
// 1) A content::WorkerThreadMessageFilter, so that we can receive IPC directly
// on worker thread.
// 2) A content::ThreadSafeSender, so we can safely send IPC from worker thread.
class WorkerThreadDispatcher : public content::RenderThreadObserver {
 public:
  WorkerThreadDispatcher();
  ~WorkerThreadDispatcher() override;

  // Thread safe.
  static WorkerThreadDispatcher* Get();
  static ServiceWorkerRequestSender* GetRequestSender();

  void Init(content::RenderThread* render_thread);
  bool Send(IPC::Message* message);
  void AddWorkerData(int64_t service_worker_version_id);
  void RemoveWorkerData(int64_t service_worker_version_id);
  V8SchemaRegistry* GetV8SchemaRegistry();

 private:
  // content::RenderThreadObserver:
  bool OnControlMessageReceived(const IPC::Message& message) override;

  // IPC handlers.
  void OnResponseWorker(int worker_thread_id,
                        int request_id,
                        bool succeeded,
                        const base::ListValue& response,
                        const std::string& error);

  // IPC sender. Belongs to the render thread, but thread safe.
  scoped_refptr<IPC::SyncMessageFilter> message_filter_;

  DISALLOW_COPY_AND_ASSIGN(WorkerThreadDispatcher);
};

}  // namespace extensions

#endif  // EXTENSIONS_RENDERER_WORKER_THREAD_DISPATCHER_H_