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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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