1// Copyright 2014 The Chromium Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style license that can be 3// found in the LICENSE file. 4 5#ifndef MOJO_PUBLIC_CPP_APPLICATION_LAZY_INTERFACE_PTR_H_ 6#define MOJO_PUBLIC_CPP_APPLICATION_LAZY_INTERFACE_PTR_H_ 7 8#include <string> 9 10#include "mojo/public/cpp/application/connect.h" 11#include "mojo/public/interfaces/application/service_provider.mojom.h" 12 13namespace mojo { 14 15template<typename Interface> 16class LazyInterfacePtr : public InterfacePtr<Interface> { 17 public: 18 LazyInterfacePtr() : service_provider_(NULL) {} 19 20 LazyInterfacePtr(ServiceProvider* service_provider) 21 : service_provider_(service_provider) { 22 } 23 24 void set_service_provider(ServiceProvider* service_provider) { 25 if (service_provider != service_provider_) { 26 InterfacePtr<Interface>::reset(); 27 } 28 service_provider_ = service_provider; 29 } 30 31 Interface* get() const { 32 if (!InterfacePtr<Interface>::get()) { 33 mojo::ConnectToService<Interface>( 34 service_provider_, 35 const_cast<LazyInterfacePtr<Interface>*>(this)); 36 } 37 return InterfacePtr<Interface>::get(); 38 } 39 Interface* operator->() const { return get(); } 40 Interface& operator*() const { return *get(); } 41 42 private: 43 ServiceProvider* service_provider_; 44}; 45 46} // namespace mojo 47 48#endif // MOJO_PUBLIC_CPP_APPLICATION_LAZY_INTERFACE_PTR_H_ 49