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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 #ifndef MOJO_EDK_SYSTEM_CHANNEL_ENDPOINT_ID_H_ | 5 #ifndef MOJO_EDK_SYSTEM_CHANNEL_ENDPOINT_ID_H_ |
| 6 #define MOJO_EDK_SYSTEM_CHANNEL_ENDPOINT_ID_H_ | 6 #define MOJO_EDK_SYSTEM_CHANNEL_ENDPOINT_ID_H_ |
| 7 | 7 |
| 8 #include <stddef.h> | 8 #include <stddef.h> |
| 9 #include <stdint.h> | 9 #include <stdint.h> |
| 10 | 10 |
| 11 #include <functional> | 11 #include <functional> |
| 12 #include <ostream> | 12 #include <ostream> |
| 13 | 13 |
| 14 #include "base/gtest_prod_util.h" | 14 #include "base/gtest_prod_util.h" |
| 15 #include "mojo/edk/system/system_impl_export.h" | |
| 16 #include "mojo/public/cpp/system/macros.h" | 15 #include "mojo/public/cpp/system/macros.h" |
| 17 | 16 |
| 18 namespace mojo { | 17 namespace mojo { |
| 19 namespace system { | 18 namespace system { |
| 20 | 19 |
| 21 // ChannelEndpointId ----------------------------------------------------------- | 20 // ChannelEndpointId ----------------------------------------------------------- |
| 22 | 21 |
| 23 class LocalChannelEndpointIdGenerator; | 22 class LocalChannelEndpointIdGenerator; |
| 24 FORWARD_DECLARE_TEST(LocalChannelEndpointIdGeneratorTest, WrapAround); | 23 FORWARD_DECLARE_TEST(LocalChannelEndpointIdGeneratorTest, WrapAround); |
| 25 FORWARD_DECLARE_TEST(RemoteChannelEndpointIdGeneratorTest, WrapAround); | 24 FORWARD_DECLARE_TEST(RemoteChannelEndpointIdGeneratorTest, WrapAround); |
| 26 | 25 |
| 27 // Represents an ID for an endpoint (i.e., one side of a message pipe) on a | 26 // Represents an ID for an endpoint (i.e., one side of a message pipe) on a |
| 28 // |Channel|. This class must be POD. | 27 // |Channel|. This class must be POD. |
| 29 // | 28 // |
| 30 // Note: The terminology "remote" for a |ChannelEndpointId| means a destination | 29 // Note: The terminology "remote" for a |ChannelEndpointId| means a destination |
| 31 // ID that was actually allocated by the sender, or similarly a source ID that | 30 // ID that was actually allocated by the sender, or similarly a source ID that |
| 32 // was allocated by the receiver. | 31 // was allocated by the receiver. |
| 33 // | 32 // |
| 34 // From the standpoint of the |Channel| with such a remote ID in its endpoint | 33 // From the standpoint of the |Channel| with such a remote ID in its endpoint |
| 35 // table, such an ID is a "remotely-allocated local ID". From the standpoint of | 34 // table, such an ID is a "remotely-allocated local ID". From the standpoint of |
| 36 // the |Channel| allocating such a remote ID (for its peer |Channel|), it's a | 35 // the |Channel| allocating such a remote ID (for its peer |Channel|), it's a |
| 37 // "locally-allocated remote ID". | 36 // "locally-allocated remote ID". |
| 38 class MOJO_SYSTEM_IMPL_EXPORT ChannelEndpointId { | 37 class ChannelEndpointId { |
| 39 public: | 38 public: |
| 40 ChannelEndpointId() : value_(0) {} | 39 ChannelEndpointId() : value_(0) {} |
| 41 ChannelEndpointId(const ChannelEndpointId& other) : value_(other.value_) {} | 40 ChannelEndpointId(const ChannelEndpointId& other) : value_(other.value_) {} |
| 42 | 41 |
| 43 // Returns the local ID to use for the first message pipe endpoint on a | 42 // Returns the local ID to use for the first message pipe endpoint on a |
| 44 // channel. | 43 // channel. |
| 45 static ChannelEndpointId GetBootstrap() { return ChannelEndpointId(1); } | 44 static ChannelEndpointId GetBootstrap() { return ChannelEndpointId(1); } |
| 46 | 45 |
| 47 bool operator==(const ChannelEndpointId& other) const { | 46 bool operator==(const ChannelEndpointId& other) const { |
| 48 return value_ == other.value_; | 47 return value_ == other.value_; |
| (...skipping 25 matching lines...) Expand all Loading... |
| 74 | 73 |
| 75 // Copying and assignment allowed. | 74 // Copying and assignment allowed. |
| 76 }; | 75 }; |
| 77 // This wrapper should add no overhead. | 76 // This wrapper should add no overhead. |
| 78 // TODO(vtl): Rewrite |sizeof(uint32_t)| as |sizeof(ChannelEndpointId::value)| | 77 // TODO(vtl): Rewrite |sizeof(uint32_t)| as |sizeof(ChannelEndpointId::value)| |
| 79 // once we have sufficient C++11 support. | 78 // once we have sufficient C++11 support. |
| 80 static_assert(sizeof(ChannelEndpointId) == sizeof(uint32_t), | 79 static_assert(sizeof(ChannelEndpointId) == sizeof(uint32_t), |
| 81 "ChannelEndpointId has incorrect size"); | 80 "ChannelEndpointId has incorrect size"); |
| 82 | 81 |
| 83 // So logging macros and |DCHECK_EQ()|, etc. work. | 82 // So logging macros and |DCHECK_EQ()|, etc. work. |
| 84 MOJO_SYSTEM_IMPL_EXPORT inline std::ostream& operator<<( | 83 inline std::ostream& operator<<(std::ostream& out, |
| 85 std::ostream& out, | 84 const ChannelEndpointId& channel_endpoint_id) { |
| 86 const ChannelEndpointId& channel_endpoint_id) { | |
| 87 return out << channel_endpoint_id.value(); | 85 return out << channel_endpoint_id.value(); |
| 88 } | 86 } |
| 89 | 87 |
| 90 // LocalChannelEndpointIdGenerator --------------------------------------------- | 88 // LocalChannelEndpointIdGenerator --------------------------------------------- |
| 91 | 89 |
| 92 // A generator for "new" local |ChannelEndpointId|s. It does not track | 90 // A generator for "new" local |ChannelEndpointId|s. It does not track |
| 93 // used/existing IDs; that must be done separately. (This class is not | 91 // used/existing IDs; that must be done separately. (This class is not |
| 94 // thread-safe.) | 92 // thread-safe.) |
| 95 class MOJO_SYSTEM_IMPL_EXPORT LocalChannelEndpointIdGenerator { | 93 class LocalChannelEndpointIdGenerator { |
| 96 public: | 94 public: |
| 97 LocalChannelEndpointIdGenerator() | 95 LocalChannelEndpointIdGenerator() |
| 98 : next_(ChannelEndpointId::GetBootstrap()) {} | 96 : next_(ChannelEndpointId::GetBootstrap()) {} |
| 99 | 97 |
| 100 ChannelEndpointId GetNext(); | 98 ChannelEndpointId GetNext(); |
| 101 | 99 |
| 102 private: | 100 private: |
| 103 FRIEND_TEST_ALL_PREFIXES(LocalChannelEndpointIdGeneratorTest, WrapAround); | 101 FRIEND_TEST_ALL_PREFIXES(LocalChannelEndpointIdGeneratorTest, WrapAround); |
| 104 | 102 |
| 105 ChannelEndpointId next_; | 103 ChannelEndpointId next_; |
| 106 | 104 |
| 107 MOJO_DISALLOW_COPY_AND_ASSIGN(LocalChannelEndpointIdGenerator); | 105 MOJO_DISALLOW_COPY_AND_ASSIGN(LocalChannelEndpointIdGenerator); |
| 108 }; | 106 }; |
| 109 | 107 |
| 110 // RemoteChannelEndpointIdGenerator -------------------------------------------- | 108 // RemoteChannelEndpointIdGenerator -------------------------------------------- |
| 111 | 109 |
| 112 // A generator for "new" remote |ChannelEndpointId|s, for |Channel|s to | 110 // A generator for "new" remote |ChannelEndpointId|s, for |Channel|s to |
| 113 // locally allocate remote IDs. (See the comment above |ChannelEndpointId| for | 111 // locally allocate remote IDs. (See the comment above |ChannelEndpointId| for |
| 114 // an explanatory note.) It does not track used/existing IDs; that must be done | 112 // an explanatory note.) It does not track used/existing IDs; that must be done |
| 115 // separately. (This class is not thread-safe.) | 113 // separately. (This class is not thread-safe.) |
| 116 class MOJO_SYSTEM_IMPL_EXPORT RemoteChannelEndpointIdGenerator { | 114 class RemoteChannelEndpointIdGenerator { |
| 117 public: | 115 public: |
| 118 RemoteChannelEndpointIdGenerator() : next_(ChannelEndpointId::kRemoteFlag) {} | 116 RemoteChannelEndpointIdGenerator() : next_(ChannelEndpointId::kRemoteFlag) {} |
| 119 | 117 |
| 120 ChannelEndpointId GetNext(); | 118 ChannelEndpointId GetNext(); |
| 121 | 119 |
| 122 private: | 120 private: |
| 123 FRIEND_TEST_ALL_PREFIXES(RemoteChannelEndpointIdGeneratorTest, WrapAround); | 121 FRIEND_TEST_ALL_PREFIXES(RemoteChannelEndpointIdGeneratorTest, WrapAround); |
| 124 | 122 |
| 125 ChannelEndpointId next_; | 123 ChannelEndpointId next_; |
| 126 | 124 |
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| 137 template <> | 135 template <> |
| 138 struct hash<mojo::system::ChannelEndpointId> { | 136 struct hash<mojo::system::ChannelEndpointId> { |
| 139 size_t operator()(mojo::system::ChannelEndpointId channel_endpoint_id) const { | 137 size_t operator()(mojo::system::ChannelEndpointId channel_endpoint_id) const { |
| 140 return static_cast<size_t>(channel_endpoint_id.value()); | 138 return static_cast<size_t>(channel_endpoint_id.value()); |
| 141 } | 139 } |
| 142 }; | 140 }; |
| 143 | 141 |
| 144 } // namespace std | 142 } // namespace std |
| 145 | 143 |
| 146 #endif // MOJO_EDK_SYSTEM_CHANNEL_ENDPOINT_ID_H_ | 144 #endif // MOJO_EDK_SYSTEM_CHANNEL_ENDPOINT_ID_H_ |
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