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| 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 "mojo/public/cpp/application/connect.h" | |
| 9 #include "mojo/public/interfaces/application/service_provider.mojom.h" | |
| 10 | |
| 11 namespace mojo { | |
| 12 | |
| 13 template <typename Interface> | |
| 14 class LazyInterfacePtr : public InterfacePtr<Interface> { | |
| 15 public: | |
| 16 LazyInterfacePtr() : service_provider_(nullptr) {} | |
| 17 | |
| 18 LazyInterfacePtr(ServiceProvider* service_provider) | |
| 19 : service_provider_(service_provider) {} | |
| 20 | |
| 21 void set_service_provider(ServiceProvider* service_provider) { | |
| 22 if (service_provider != service_provider_) { | |
| 23 InterfacePtr<Interface>::reset(); | |
| 24 } | |
| 25 service_provider_ = service_provider; | |
| 26 } | |
| 27 | |
| 28 Interface* get() const { | |
| 29 if (!InterfacePtr<Interface>::get() && service_provider_) { | |
| 30 mojo::ConnectToService<Interface>( | |
| 31 service_provider_, const_cast<LazyInterfacePtr<Interface>*>(this)); | |
| 32 } | |
| 33 return InterfacePtr<Interface>::get(); | |
| 34 } | |
| 35 Interface* operator->() const { return get(); } | |
| 36 Interface& operator*() const { return *get(); } | |
| 37 | |
| 38 private: | |
| 39 ServiceProvider* service_provider_; | |
| 40 }; | |
| 41 | |
| 42 } // namespace mojo | |
| 43 | |
| 44 #endif // MOJO_PUBLIC_CPP_APPLICATION_LAZY_INTERFACE_PTR_H_ | |
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