9eb3e1f77d
Summary: Use delete to disable automatic generated methods instead of private, and put the constructor together for more clear.This modification cause the unused field warning, so add unused attribute to disable this warning. Pull Request resolved: https://github.com/facebook/rocksdb/pull/5009 Differential Revision: D17288733 fbshipit-source-id: 8a767ce096f185f1db01bd28fc88fef1cdd921f3
68 lines
2.0 KiB
C++
68 lines
2.0 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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//
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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#pragma once
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#include <atomic>
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#include <memory>
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#include "rocksdb/env.h"
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#include "rocksdb/concurrent_task_limiter.h"
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namespace rocksdb {
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class TaskLimiterToken;
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class ConcurrentTaskLimiterImpl : public ConcurrentTaskLimiter {
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public:
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explicit ConcurrentTaskLimiterImpl(const std::string& name,
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int32_t max_outstanding_task);
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// No copying allowed
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ConcurrentTaskLimiterImpl(const ConcurrentTaskLimiterImpl&) = delete;
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ConcurrentTaskLimiterImpl& operator=(
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const ConcurrentTaskLimiterImpl&) = delete;
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virtual ~ConcurrentTaskLimiterImpl();
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virtual const std::string& GetName() const override;
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virtual void SetMaxOutstandingTask(int32_t limit) override;
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virtual void ResetMaxOutstandingTask() override;
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virtual int32_t GetOutstandingTask() const override;
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// Request token for adding a new task.
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// If force == true, it requests a token bypassing throttle.
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// Returns nullptr if it got throttled.
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virtual std::unique_ptr<TaskLimiterToken> GetToken(bool force);
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private:
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friend class TaskLimiterToken;
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std::string name_;
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std::atomic<int32_t> max_outstanding_tasks_;
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std::atomic<int32_t> outstanding_tasks_;
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};
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class TaskLimiterToken {
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public:
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explicit TaskLimiterToken(ConcurrentTaskLimiterImpl* limiter)
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: limiter_(limiter) {}
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~TaskLimiterToken();
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private:
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ConcurrentTaskLimiterImpl* limiter_;
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// no copying allowed
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TaskLimiterToken(const TaskLimiterToken&) = delete;
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void operator=(const TaskLimiterToken&) = delete;
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};
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} // namespace rocksdb
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