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