| // Copyright 2014 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef MOJO_EDK_JS_WAITING_CALLBACK_H_ |
| #define MOJO_EDK_JS_WAITING_CALLBACK_H_ |
| |
| #include "base/macros.h" |
| #include "base/memory/weak_ptr.h" |
| #include "gin/handle.h" |
| #include "gin/runner.h" |
| #include "gin/wrappable.h" |
| #include "mojo/edk/js/handle.h" |
| #include "mojo/public/cpp/system/core.h" |
| #include "mojo/public/cpp/system/simple_watcher.h" |
| |
| namespace mojo { |
| namespace edk { |
| namespace js { |
| |
| class WaitingCallback : public gin::Wrappable<WaitingCallback> { |
| public: |
| static gin::WrapperInfo kWrapperInfo; |
| |
| // Creates a new WaitingCallback. |
| // |
| // If |one_shot| is true, the callback will only ever be called at most once. |
| // If false, the callback may be called any number of times until the |
| // WaitingCallback is explicitly cancelled. |
| static gin::Handle<WaitingCallback> Create( |
| v8::Isolate* isolate, |
| v8::Handle<v8::Function> callback, |
| gin::Handle<HandleWrapper> handle_wrapper, |
| MojoHandleSignals signals, |
| bool one_shot); |
| |
| // Cancels the callback. Does nothing if a callback is not pending. This is |
| // implicitly invoked from the destructor but can be explicitly invoked as |
| // necessary. |
| void Cancel(); |
| |
| private: |
| WaitingCallback(v8::Isolate* isolate, |
| v8::Handle<v8::Function> callback, |
| bool one_shot); |
| ~WaitingCallback() override; |
| |
| // Callback from the Watcher. |
| void OnHandleReady(MojoResult result); |
| |
| // Indicates whether this is a one-shot callback or not. If so, it uses the |
| // deprecated HandleWatcher to wait for signals; otherwise it uses the new |
| // system Watcher API. |
| const bool one_shot_; |
| |
| base::WeakPtr<gin::Runner> runner_; |
| SimpleWatcher watcher_; |
| base::WeakPtrFactory<WaitingCallback> weak_factory_; |
| |
| DISALLOW_COPY_AND_ASSIGN(WaitingCallback); |
| }; |
| |
| } // namespace js |
| } // namespace edk |
| } // namespace mojo |
| |
| #endif // MOJO_EDK_JS_WAITING_CALLBACK_H_ |