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51 lines
1.8 KiB
51 lines
1.8 KiB
// 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 <stdint.h>
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#include <string>
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#include "rocksdb/rocksdb_namespace.h"
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namespace ROCKSDB_NAMESPACE {
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// This is NOT an extensible interface but a public interface for result of
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// NewConcurrentTaskLimiter. Any derived classes must be RocksDB internal.
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class ConcurrentTaskLimiter {
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public:
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virtual ~ConcurrentTaskLimiter() {}
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// Returns a name that identifies this concurrent task limiter.
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virtual const std::string& GetName() const = 0;
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// Set max concurrent tasks.
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// limit = 0 means no new task allowed.
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// limit < 0 means no limitation.
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virtual void SetMaxOutstandingTask(int32_t limit) = 0;
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// Reset to unlimited max concurrent task.
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virtual void ResetMaxOutstandingTask() = 0;
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// Returns current outstanding task count.
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virtual int32_t GetOutstandingTask() const = 0;
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};
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// Create a ConcurrentTaskLimiter that can be shared with multiple CFs
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// across RocksDB instances to control concurrent tasks.
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//
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// @param name: Name of the limiter.
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// @param limit: max concurrent tasks.
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// limit = 0 means no new task allowed.
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// limit < 0 means no limitation.
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extern ConcurrentTaskLimiter* NewConcurrentTaskLimiter(const std::string& name,
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int32_t limit);
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} // namespace ROCKSDB_NAMESPACE
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