mojo/bindings/js/waiting_callback.h

   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
   3 // found in the LICENSE file.
   4
   5 #ifndef MOJO_BINDINGS_JS_WAITING_CALLBACK_H_
   6 #define MOJO_BINDINGS_JS_WAITING_CALLBACK_H_
   7
   8 #include "gin/handle.h"
   9 #include "gin/runner.h"
  10 #include "gin/wrappable.h"
  11 #include "mojo/bindings/js/handle.h"
  12 #include "mojo/bindings/js/handle_close_observer.h"
  13 #include "mojo/public/c/environment/async_waiter.h"
  14 #include "mojo/public/cpp/system/core.h"
  15
  16 namespace mojo {
  17 namespace js {
  18
  19 class WaitingCallback : public gin::Wrappable<WaitingCallback>,
  20                         public gin::HandleCloseObserver {
  21  public:
  22   static gin::WrapperInfo kWrapperInfo;
  23
  24   // Creates a new WaitingCallback.
  25   static gin::Handle<WaitingCallback> Create(
  26       v8::Isolate* isolate,
  27       v8::Handle<v8::Function> callback,
  28       gin::Handle<gin::HandleWrapper> handle_wrapper,
  29       MojoHandleSignals signals);
  30
  31   // Cancels the callback. Does nothing if a callback is not pending. This is
  32   // implicitly invoked from the destructor but can be explicitly invoked as
  33   // necessary.
  34   void Cancel();
  35
  36  private:
  37   WaitingCallback(v8::Isolate* isolate,
  38                   v8::Handle<v8::Function> callback,
  39                   gin::Handle<gin::HandleWrapper> handle_wrapper);
  40   virtual ~WaitingCallback();
  41
  42   // Callback from MojoAsyncWaiter. |closure| is the WaitingCallback.
  43   static void CallOnHandleReady(void* closure, MojoResult result);
  44
  45   // Invoked from CallOnHandleReady() (CallOnHandleReady() must be static).
  46   void OnHandleReady(MojoResult result);
  47
  48   // Invoked by the HandleWrapper if the handle is closed while this wait is
  49   // still in progress.
  50   virtual void OnWillCloseHandle() OVERRIDE;
  51
  52   base::WeakPtr<gin::Runner> runner_;
  53   MojoAsyncWaitID wait_id_;
  54
  55   gin::HandleWrapper* handle_wrapper_;
  56
  57   DISALLOW_COPY_AND_ASSIGN(WaitingCallback);
  58 };
  59
  60 }  // namespace js
  61 }  // namespace mojo
  62
  63 #endif  // MOJO_BINDINGS_JS_WAITING_CALLBACK_H_