isolate_scope.h

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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
 
#include "flutter/fml/logging.h"
#include "third_party/dart/runtime/include/dart_api.h"
 
#ifndef FLUTTER_SHELL_PLATFORM_COMMON_ISOLATE_SCOPE_H_
#define FLUTTER_SHELL_PLATFORM_COMMON_ISOLATE_SCOPE_H_
 
namespace flutter {
 
/// This class is a thin wrapper around dart isolate. It can be used
/// as argument to IsolateScope constructor to enter and exit the isolate.
class Isolate {
 public:
  /// Retrieve the current Dart Isolate. If no isolate is current, this
  /// results in a crash.
  static Isolate Current();
 
  ~Isolate() = default;
 
 private:
  explicit Isolate(Dart_Isolate isolate) : isolate_(isolate) {
    FML_DCHECK(isolate_ != nullptr);
  }
 
  friend class IsolateScope;
  Dart_Isolate isolate_;
};
 
// Enters provided isolate for as long as the scope is alive.
class IsolateScope {
 public:
  explicit IsolateScope(const Isolate& isolate);
  ~IsolateScope();
 
 private:
  Dart_Isolate isolate_;
  Dart_Isolate previous_;
 
  FML_DISALLOW_COPY_AND_ASSIGN(IsolateScope);
};
 
}  // namespace flutter
 
#endif  // FLUTTER_SHELL_PLATFORM_COMMON_ISOLATE_SCOPE_H_