/* * Copyright (c) Facebook, Inc. and its affiliates. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #pragma once #include #include #include #include namespace folly { class RequestContext; class QueueObserver { public: virtual ~QueueObserver() {} virtual intptr_t onEnqueued(const RequestContext*) = 0; virtual void onDequeued(intptr_t) = 0; }; class QueueObserverFactory { public: virtual ~QueueObserverFactory() {} virtual std::unique_ptr create(int8_t pri) = 0; static std::unique_ptr make( const std::string& context, size_t numPriorities); }; using MakeQueueObserverFactory = std::unique_ptr(const std::string&, size_t); #if FOLLY_HAVE_WEAK_SYMBOLS FOLLY_ATTR_WEAK MakeQueueObserverFactory make_queue_observer_factory; #else constexpr MakeQueueObserverFactory* make_queue_observer_factory = nullptr; #endif } // namespace folly