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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 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 IPC_IPC_SYNC_MESSAGE_H_ | 5 #ifndef IPC_IPC_SYNC_MESSAGE_H_ |
| 6 #define IPC_IPC_SYNC_MESSAGE_H_ | 6 #define IPC_IPC_SYNC_MESSAGE_H_ |
| 7 | 7 |
| 8 #if defined(OS_WIN) | 8 #if defined(OS_WIN) |
| 9 #include <windows.h> | 9 #include <windows.h> |
| 10 #endif | 10 #endif |
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| 53 | 53 |
| 54 base::WaitableEvent* pump_messages_event() const { | 54 base::WaitableEvent* pump_messages_event() const { |
| 55 return pump_messages_event_; | 55 return pump_messages_event_; |
| 56 } | 56 } |
| 57 | 57 |
| 58 // Returns true if the message is a reply to the given request id. | 58 // Returns true if the message is a reply to the given request id. |
| 59 static bool IsMessageReplyTo(const Message& msg, int request_id); | 59 static bool IsMessageReplyTo(const Message& msg, int request_id); |
| 60 | 60 |
| 61 // Given a reply message, returns an iterator to the beginning of the data | 61 // Given a reply message, returns an iterator to the beginning of the data |
| 62 // (i.e. skips over the synchronous specific data). | 62 // (i.e. skips over the synchronous specific data). |
| 63 static PickleIterator GetDataIterator(const Message* msg); | 63 static base::PickleIterator GetDataIterator(const Message* msg); |
| 64 | 64 |
| 65 // Given a synchronous message (or its reply), returns its id. | 65 // Given a synchronous message (or its reply), returns its id. |
| 66 static int GetMessageId(const Message& msg); | 66 static int GetMessageId(const Message& msg); |
| 67 | 67 |
| 68 // Generates a reply message to the given message. | 68 // Generates a reply message to the given message. |
| 69 static Message* GenerateReply(const Message* msg); | 69 static Message* GenerateReply(const Message* msg); |
| 70 | 70 |
| 71 private: | 71 private: |
| 72 struct SyncHeader { | 72 struct SyncHeader { |
| 73 // unique ID (unique per sender) | 73 // unique ID (unique per sender) |
| 74 int message_id; | 74 int message_id; |
| 75 }; | 75 }; |
| 76 | 76 |
| 77 static bool ReadSyncHeader(const Message& msg, SyncHeader* header); | 77 static bool ReadSyncHeader(const Message& msg, SyncHeader* header); |
| 78 static bool WriteSyncHeader(Message* msg, const SyncHeader& header); | 78 static bool WriteSyncHeader(Message* msg, const SyncHeader& header); |
| 79 | 79 |
| 80 scoped_ptr<MessageReplyDeserializer> deserializer_; | 80 scoped_ptr<MessageReplyDeserializer> deserializer_; |
| 81 base::WaitableEvent* pump_messages_event_; | 81 base::WaitableEvent* pump_messages_event_; |
| 82 }; | 82 }; |
| 83 | 83 |
| 84 // Used to deserialize parameters from a reply to a synchronous message | 84 // Used to deserialize parameters from a reply to a synchronous message |
| 85 class IPC_EXPORT MessageReplyDeserializer { | 85 class IPC_EXPORT MessageReplyDeserializer { |
| 86 public: | 86 public: |
| 87 virtual ~MessageReplyDeserializer() {} | 87 virtual ~MessageReplyDeserializer() {} |
| 88 bool SerializeOutputParameters(const Message& msg); | 88 bool SerializeOutputParameters(const Message& msg); |
| 89 private: | 89 private: |
| 90 // Derived classes need to implement this, using the given iterator (which | 90 // Derived classes need to implement this, using the given iterator (which |
| 91 // is skipped past the header for synchronous messages). | 91 // is skipped past the header for synchronous messages). |
| 92 virtual bool SerializeOutputParameters(const Message& msg, | 92 virtual bool SerializeOutputParameters(const Message& msg, |
| 93 PickleIterator iter) = 0; | 93 base::PickleIterator iter) = 0; |
| 94 }; | 94 }; |
| 95 | 95 |
| 96 // When sending a synchronous message, this structure contains an object | 96 // When sending a synchronous message, this structure contains an object |
| 97 // that knows how to deserialize the response. | 97 // that knows how to deserialize the response. |
| 98 struct PendingSyncMsg { | 98 struct PendingSyncMsg { |
| 99 PendingSyncMsg(int id, | 99 PendingSyncMsg(int id, |
| 100 MessageReplyDeserializer* d, | 100 MessageReplyDeserializer* d, |
| 101 base::WaitableEvent* e) | 101 base::WaitableEvent* e) |
| 102 : id(id), deserializer(d), done_event(e), send_result(false) { } | 102 : id(id), deserializer(d), done_event(e), send_result(false) { } |
| 103 int id; | 103 int id; |
| 104 MessageReplyDeserializer* deserializer; | 104 MessageReplyDeserializer* deserializer; |
| 105 base::WaitableEvent* done_event; | 105 base::WaitableEvent* done_event; |
| 106 bool send_result; | 106 bool send_result; |
| 107 }; | 107 }; |
| 108 | 108 |
| 109 } // namespace IPC | 109 } // namespace IPC |
| 110 | 110 |
| 111 #endif // IPC_IPC_SYNC_MESSAGE_H_ | 111 #endif // IPC_IPC_SYNC_MESSAGE_H_ |
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