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| 1 // Copyright 2017 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 CONTENT_COMMON_MESSAGE_PORT_H_ |
| 6 #define CONTENT_COMMON_MESSAGE_PORT_H_ |
| 7 |
| 8 #include <vector> |
| 9 |
| 10 #include "base/callback.h" |
| 11 #include "base/macros.h" |
| 12 #include "base/memory/ref_counted.h" |
| 13 #include "base/strings/string16.h" |
| 14 #include "content/common/content_export.h" |
| 15 #include "mojo/public/cpp/system/message_pipe.h" |
| 16 |
| 17 namespace content { |
| 18 |
| 19 // MessagePort corresponds to a HTML MessagePort. It is a thin wrapper around a |
| 20 // Mojo MessagePipeHandle and provides methods for reading and writing messages. |
| 21 // |
| 22 // TODO(darin): Make this class move-only once no longer used with Chrome IPC. |
| 23 // |
| 24 class CONTENT_EXPORT MessagePort { |
| 25 public: |
| 26 ~MessagePort(); |
| 27 MessagePort(); |
| 28 |
| 29 // Shallow copy, resulting in multiple references to the same port. |
| 30 MessagePort(const MessagePort& other); |
| 31 MessagePort& operator=(const MessagePort& other); |
| 32 |
| 33 explicit MessagePort(mojo::ScopedMessagePipeHandle handle); |
| 34 |
| 35 const mojo::ScopedMessagePipeHandle& GetHandle() const; |
| 36 mojo::ScopedMessagePipeHandle ReleaseHandle() const; |
| 37 |
| 38 static std::vector<mojo::ScopedMessagePipeHandle> ReleaseHandles( |
| 39 const std::vector<MessagePort>& ports); |
| 40 |
| 41 // Sends an encoded message (along with ports to transfer) to this port's |
| 42 // peer. |
| 43 void PostMessage(const base::string16& encoded_message, |
| 44 std::vector<MessagePort> ports); |
| 45 |
| 46 // Get the next available encoded message if any. Returns true if a message |
| 47 // was read. |
| 48 bool GetMessage(base::string16* encoded_message, |
| 49 std::vector<MessagePort>* ports); |
| 50 |
| 51 // This callback will be invoked on a background thread when messages are |
| 52 // available to be read via GetMessage. |
| 53 void SetCallback(const base::Closure& callback); |
| 54 |
| 55 // Clears any callback specified by a prior call to SetCallback. |
| 56 void ClearCallback(); |
| 57 |
| 58 private: |
| 59 class State : public base::RefCountedThreadSafe<State> { |
| 60 public: |
| 61 State(); |
| 62 State(mojo::ScopedMessagePipeHandle handle); |
| 63 |
| 64 void AddWatch(); |
| 65 void CancelWatch(); |
| 66 static void OnHandleReady(uintptr_t context, |
| 67 MojoResult result, |
| 68 MojoHandleSignalsState signals_state, |
| 69 MojoWatchNotificationFlags flags); |
| 70 |
| 71 mojo::ScopedMessagePipeHandle handle_; |
| 72 base::Closure callback_; |
| 73 |
| 74 private: |
| 75 friend class base::RefCountedThreadSafe<State>; |
| 76 ~State(); |
| 77 }; |
| 78 mutable scoped_refptr<State> state_; |
| 79 }; |
| 80 |
| 81 } // namespace content |
| 82 |
| 83 #endif // CONTENT_COMMON_MESSAGE_PORT_H_ |
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