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Ramanpreet Nara
de56649430
Summary: We'll be using a native CallInvoker to dispatch sync and async method calls to ObjC NativeModules. This native CallInvoker will hold a reference to the ObjC NativeModule's method queue. **Why is the native CallInvoker required for ObjC NativeModules?** In the case where the ObjC NativeModule neither provides nor requests a method queue, we must create a method queue for it. When we go to invoke a method from JS, for these NativeModules specifically, there is no way to access this method queue. A native CallInvoker is a convenient abstraction that holds on to that method queue. For async calls, we'll just call `CallInvoker::invokeAsync`, and for sync calls, we'll just call `CallInvoker::invokeSync`. **Why do we need sync call support for native `CallInvoker`?** In ObjC, sync NativeModule method calls block the JS thread, then execute synchronously on the NativeModule's method queue, and then unblock the JS thread. This is what'll be implemented by `CallInvoker::invokeSync`. Changelog: [Internal] Reviewed By: fkgozali Differential Revision: D20829955 fbshipit-source-id: efb9d5408a1ade81069a943c865f232d4d10acfe