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// Copyright 2013 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 GIN_RUNNER_H_
#define GIN_RUNNER_H_
#include <string>
#include "base/memory/weak_ptr.h"
#include "gin/gin_export.h"
#include "gin/public/context_holder.h"
#include "v8/include/v8-forward.h"
#include "v8/include/v8-isolate.h"
namespace gin {
// Runner is responsible for running code in a v8::Context.
class GIN_EXPORT Runner {
Runner(const Runner&) = delete;
Runner& operator=(const Runner&) = delete;
virtual ~Runner();
// Before running script in this context, you'll need to enter the runner's
// context by creating an instance of Runner::Scope on the stack.
virtual v8::MaybeLocal<v8::Value> Run(const std::string& source,
const std::string& resource_name) = 0;
virtual ContextHolder* GetContextHolder() = 0;
v8::Local<v8::Object> global() {
return GetContextHolder()->context()->Global();
// Useful for running script in this context asynchronously. Rather than
// holding a raw pointer to the runner, consider holding a WeakPtr.
base::WeakPtr<Runner> GetWeakPtr() {
return weak_factory_.GetWeakPtr();
class GIN_EXPORT Scope {
explicit Scope(Runner* runner);
Scope(const Scope&) = delete;
Scope& operator=(const Scope&) = delete;
v8::Isolate::Scope isolate_scope_;
v8::HandleScope handle_scope_;
v8::Context::Scope scope_;
friend class Scope;
base::WeakPtrFactory<Runner> weak_factory_{this};
} // namespace gin
#endif // GIN_RUNNER_H_