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| 1 // Copyright 2015 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_BINDINGS_LIB_ASSOCIATED_INTERFACE_PTR_INTERNAL_H_ |
| 6 #define MOJO_PUBLIC_CPP_BINDINGS_LIB_ASSOCIATED_INTERFACE_PTR_INTERNAL_H_ |
| 7 |
| 8 #include <algorithm> // For |std::swap()|. |
| 9 |
| 10 #include "base/macros.h" |
| 11 #include "base/memory/scoped_ptr.h" |
| 12 #include "mojo/public/cpp/bindings/associated_group.h" |
| 13 #include "mojo/public/cpp/bindings/associated_interface_ptr_info.h" |
| 14 #include "mojo/public/cpp/bindings/callback.h" |
| 15 #include "mojo/public/cpp/bindings/lib/control_message_proxy.h" |
| 16 #include "mojo/public/cpp/bindings/lib/interface_endpoint_client.h" |
| 17 #include "mojo/public/cpp/bindings/lib/interface_id.h" |
| 18 #include "mojo/public/cpp/bindings/lib/multiplex_router.h" |
| 19 #include "mojo/public/cpp/bindings/lib/scoped_interface_endpoint_handle.h" |
| 20 |
| 21 namespace mojo { |
| 22 namespace internal { |
| 23 |
| 24 template <typename Interface> |
| 25 class AssociatedInterfacePtrState { |
| 26 public: |
| 27 AssociatedInterfacePtrState() : version_(0u) {} |
| 28 |
| 29 ~AssociatedInterfacePtrState() { |
| 30 endpoint_client_.reset(); |
| 31 proxy_.reset(); |
| 32 } |
| 33 |
| 34 Interface* instance() { |
| 35 // This will be null if the object is not bound. |
| 36 return proxy_.get(); |
| 37 } |
| 38 |
| 39 uint32_t version() const { return version_; } |
| 40 |
| 41 void QueryVersion(const Callback<void(uint32_t)>& callback) { |
| 42 // It is safe to capture |this| because the callback won't be run after this |
| 43 // object goes away. |
| 44 auto callback_wrapper = [this, callback](uint32_t version) { |
| 45 this->version_ = version; |
| 46 callback.Run(version); |
| 47 }; |
| 48 |
| 49 // Do a static cast in case the interface contains methods with the same |
| 50 // name. |
| 51 static_cast<ControlMessageProxy*>(proxy_.get()) |
| 52 ->QueryVersion(callback_wrapper); |
| 53 } |
| 54 |
| 55 void RequireVersion(uint32_t version) { |
| 56 if (version <= version_) |
| 57 return; |
| 58 |
| 59 version_ = version; |
| 60 // Do a static cast in case the interface contains methods with the same |
| 61 // name. |
| 62 static_cast<ControlMessageProxy*>(proxy_.get())->RequireVersion(version); |
| 63 } |
| 64 |
| 65 void Swap(AssociatedInterfacePtrState* other) { |
| 66 using std::swap; |
| 67 swap(other->endpoint_client_, endpoint_client_); |
| 68 swap(other->proxy_, proxy_); |
| 69 swap(other->version_, version_); |
| 70 } |
| 71 |
| 72 void Bind(AssociatedInterfacePtrInfo<Interface> info) { |
| 73 DCHECK(!endpoint_client_); |
| 74 DCHECK(!proxy_); |
| 75 DCHECK_EQ(0u, version_); |
| 76 DCHECK(info.is_valid()); |
| 77 |
| 78 version_ = info.version(); |
| 79 endpoint_client_.reset(new InterfaceEndpointClient( |
| 80 AssociatedInterfacePtrInfoHelper::PassHandle(&info), nullptr, |
| 81 make_scoped_ptr(new typename Interface::ResponseValidator_()))); |
| 82 proxy_.reset(new Proxy(endpoint_client_.get())); |
| 83 } |
| 84 |
| 85 // After this method is called, the object is in an invalid state and |
| 86 // shouldn't be reused. |
| 87 AssociatedInterfacePtrInfo<Interface> PassInterface() { |
| 88 ScopedInterfaceEndpointHandle handle = endpoint_client_->PassHandle(); |
| 89 endpoint_client_.reset(); |
| 90 proxy_.reset(); |
| 91 |
| 92 AssociatedInterfacePtrInfo<Interface> result; |
| 93 result.set_version(version_); |
| 94 AssociatedInterfacePtrInfoHelper::SetHandle(&result, handle.Pass()); |
| 95 return result.Pass(); |
| 96 } |
| 97 |
| 98 bool is_bound() const { return !!endpoint_client_; } |
| 99 |
| 100 bool encountered_error() const { |
| 101 return endpoint_client_ ? endpoint_client_->encountered_error() : false; |
| 102 } |
| 103 |
| 104 void set_connection_error_handler(const Closure& error_handler) { |
| 105 DCHECK(endpoint_client_); |
| 106 endpoint_client_->set_connection_error_handler(error_handler); |
| 107 } |
| 108 |
| 109 // Returns true if bound and awaiting a response to a message. |
| 110 bool has_pending_callbacks() const { |
| 111 return endpoint_client_ && endpoint_client_->has_pending_responders(); |
| 112 } |
| 113 |
| 114 AssociatedGroup* associated_group() { |
| 115 return endpoint_client_ ? endpoint_client_->associated_group() : nullptr; |
| 116 } |
| 117 |
| 118 private: |
| 119 using Proxy = typename Interface::Proxy_; |
| 120 |
| 121 scoped_ptr<InterfaceEndpointClient> endpoint_client_; |
| 122 scoped_ptr<Proxy> proxy_; |
| 123 |
| 124 uint32_t version_; |
| 125 |
| 126 DISALLOW_COPY_AND_ASSIGN(AssociatedInterfacePtrState); |
| 127 }; |
| 128 |
| 129 } // namespace internal |
| 130 } // namespace mojo |
| 131 |
| 132 #endif // MOJO_PUBLIC_CPP_BINDINGS_LIB_ASSOCIATED_INTERFACE_PTR_INTERNAL_H_ |
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