1 // Copyright 2013 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_BINDINGS_LIB_BINDINGS_SUPPORT_H_ 6 #define MOJO_PUBLIC_BINDINGS_LIB_BINDINGS_SUPPORT_H_ 7 8 #include "mojo/public/system/core_cpp.h" 9 10 namespace mojo { 11 class Buffer; 12 13 // An embedder of the bindings library MUST implement BindingsSupport and call 14 // BindingsSupport::Set prior to using the library. 15 class BindingsSupport { 16 public: 17 class AsyncWaitCallback { 18 public: ~AsyncWaitCallback()19 virtual ~AsyncWaitCallback() {} 20 virtual void OnHandleReady(MojoResult result) = 0; 21 }; 22 23 typedef void* AsyncWaitID; 24 25 static void Set(BindingsSupport* support); 26 static BindingsSupport* Get(); 27 28 // Get/set the current thread's Buffer pointer. SetCurrentBuffer returns the 29 // previously current Buffer. 30 virtual Buffer* GetCurrentBuffer() = 0; 31 virtual Buffer* SetCurrentBuffer(Buffer* buf) = 0; 32 33 // Asynchronously call MojoWait on a background thread, and pass the result 34 // of MojoWait to the given AsyncWaitCallback on the current thread. Returns 35 // an AsyncWaitID that can be used with CancelWait to stop waiting. This 36 // identifier becomes invalid once the callback runs. 37 virtual AsyncWaitID AsyncWait(const Handle& handle, 38 MojoWaitFlags flags, 39 AsyncWaitCallback* callback) = 0; 40 41 // Cancel an existing call to AsyncWait with the given AsyncWaitID. The 42 // corresponding AsyncWaitCallback's OnHandleReady method will not be called 43 // in this case. 44 virtual void CancelWait(AsyncWaitID id) = 0; 45 46 protected: ~BindingsSupport()47 virtual ~BindingsSupport() {} 48 }; 49 50 } // namespace mojo 51 52 #endif // MOJO_PUBLIC_BINDINGS_LIB_BINDINGS_SUPPORT_H_ 53