Rename HHWheelTimer::Callback::context_ -> requestContext_

Summary: HHWheelTimer::Callback is frequently used as a base class for callback objects, while context_ is a commonly desired member name in other classes that also serve as base classes for HHWheelTimer::Callback derived classes. Renaming in HHWheelTimer::Callback to free up availability of context_.

Reviewed By: yfeldblum

Differential Revision: D8937020

fbshipit-source-id: 8a4612bc57f28673762604cc118a91a347e5972d

folly/io/async/HHWheelTimer.cpp

@@ -147,7 +147,7 @@ void HHWheelTimer::scheduleTimeout(
   // Cancel the callback if it happens to be scheduled already.
   callback->cancelTimeout();
 
-  callback->context_ = RequestContext::saveContext();
+  callback->requestContext_ = RequestContext::saveContext();
 
   count_++;
 
@@ -232,7 +232,7 @@ void HHWheelTimer::timeoutExpired() noexcept {
     count_--;
     cb->wheel_ = nullptr;
     cb->expiration_ = {};
-    RequestContextScopeGuard rctx(cb->context_);
+    RequestContextScopeGuard rctx(cb->requestContext_);
     cb->timeoutExpired();
     if (isDestroyed) {
       // The HHWheelTimer itself has been destroyed. The other callbacks

folly/io/async/HHWheelTimer.h

@@ -144,7 +144,7 @@ class HHWheelTimer : private folly::AsyncTimeout,
         list<Callback, boost::intrusive::constant_time_size<false>>
             List;
 
-    std::shared_ptr<RequestContext> context_;
+    std::shared_ptr<RequestContext> requestContext_;
 
     // Give HHWheelTimer direct access to our members so it can take care
     // of scheduling/cancelling.