electron/common/node_bindings.h

// Copyright (c) 2013 GitHub, Inc. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef ATOM_COMMON_NODE_BINDINGS_H_
#define ATOM_COMMON_NODE_BINDINGS_H_

#include "base/basictypes.h"
#include "base/memory/weak_ptr.h"
#include "v8/include/v8.h"
#include "vendor/node/deps/uv/include/uv.h"

namespace base {
class MessageLoop;
}

namespace node {
class Environment;
}

namespace atom {

class NodeBindings {
 public:
  static NodeBindings* Create(bool is_browser);

  virtual ~NodeBindings();

  // Setup V8, libuv.
  virtual void Initialize();

  // Create the environment and load node.js.
  virtual node::Environment* CreateEnvironment(v8::Handle<v8::Context> context);

  // Prepare for message loop integration.
  virtual void PrepareMessageLoop();

  // Do message loop integration.
  virtual void RunMessageLoop();

 protected:
  explicit NodeBindings(bool is_browser);

  // Called to poll events in new thread.
  virtual void PollEvents() = 0;

  // Run the libuv loop for once.
  void UvRunOnce();

  // Make the main thread run libuv loop.
  void WakeupMainThread();

  // Interrupt the PollEvents.
  void WakeupEmbedThread();

  // Are we running in browser.
  bool is_browser_;

  // Main thread's MessageLoop.
  base::MessageLoop* message_loop_;

  // Main thread's libuv loop.
  uv_loop_t* uv_loop_;

 private:
  // Thread to poll uv events.
  static void EmbedThreadRunner(void *arg);

  // Do idle GC.
  static void IdleCallback(uv_timer_t*, int);

  // Whether the libuv loop has ended.
  bool embed_closed_;

  // Dummy handle to make uv's loop not quit.
  uv_async_t dummy_uv_handle_;

  // Timer to do idle GC.
  uv_timer_t idle_timer_;

  // Thread for polling events.
  uv_thread_t embed_thread_;

  // Semaphore to wait for main loop in the embed thread.
  uv_sem_t embed_sem_;

  base::WeakPtrFactory<NodeBindings> weak_factory_;

  DISALLOW_COPY_AND_ASSIGN(NodeBindings);
};

}  // namespace atom

#endif  // ATOM_COMMON_NODE_BINDINGS_H_