dart_state.h

// Copyright 2015 The Fuchsia 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 LIB_TONIC_DART_STATE_H_
#define LIB_TONIC_DART_STATE_H_

#include <memory>

#include "dart/runtime/include/dart_api.h"
#include "lib/ftl/logging.h"
#include "lib/ftl/memory/weak_ptr.h"
#include "lib/tonic/dart_persistent_value.h"
#include "lib/tonic/scopes/dart_api_scope.h"
#include "lib/tonic/scopes/dart_isolate_scope.h"

namespace tonic {
class DartClassLibrary;
class DartMessageHandler;
class FileLoader;

// DartState represents the state associated with a given Dart isolate. The
// lifetime of this object is controlled by the DartVM. If you want to hold a
// reference to a DartState instance, please hold a ftl::WeakPtr<DartState>.
//
// DartState is analogous to gin::PerIsolateData and JSC::ExecState.
class DartState {
 public:
  class Scope {
   public:
    Scope(DartState* dart_state);
    ~Scope();

   private:
    DartIsolateScope scope_;
    DartApiScope api_scope_;
  };

  DartState();
  virtual ~DartState();

  static DartState* From(Dart_Isolate isolate);
  static DartState* Current();

  ftl::WeakPtr<DartState> GetWeakPtr();

  Dart_Isolate isolate() { return isolate_; }
  void SetIsolate(Dart_Isolate isolate);

  DartClassLibrary& class_library() { return *class_library_; }
  DartMessageHandler& message_handler() { return *message_handler_; }
  FileLoader& file_loader() { return *file_loader_; }

  virtual void DidSetIsolate();

  static Dart_Handle HandleLibraryTag(Dart_LibraryTag tag,
                                      Dart_Handle library,
                                      Dart_Handle url);

 private:
  Dart_Isolate isolate_;
  std::unique_ptr<DartClassLibrary> class_library_;
  std::unique_ptr<DartMessageHandler> message_handler_;
  std::unique_ptr<FileLoader> file_loader_;

 protected:
  ftl::WeakPtrFactory<DartState> weak_factory_;

  FTL_DISALLOW_COPY_AND_ASSIGN(DartState);
};

}  // namespace tonic

#endif  // LIB_TONIC_DART_STATE_H_