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https://github.com/mariadb-corporation/mariadb-columnstore-engine.git
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52 lines
1.6 KiB
C++
52 lines
1.6 KiB
C++
/* Copyright (C) 2019 MariaDB Corporaton
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; version 2 of
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the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#pragma once
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/* This class defines a pool of bytestreams to improve BS reuse, reducing
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the need to use the dynamic allocator. It allocates as many BS's as needed,
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and automatically disposes of buffers that are 'large' to reduce mem usage.
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Initially, 'large' is defined as 1MB.
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*/
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#include <deque>
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#include <boost/thread/mutex.hpp>
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#include "bytestream.h"
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namespace messageqcpp
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{
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class ByteStreamPool
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{
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public:
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ByteStreamPool();
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ByteStreamPool(uint largeBufferSize); // BS's above largeBufferSize get deallocated on return to the pool
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ByteStreamPool(uint largeBufferSize,
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uint freeBufferLimit); // freeBufferLimit is the max # of BSs to reserve
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virtual ~ByteStreamPool();
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ByteStream* getByteStream();
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void returnByteStream(ByteStream*);
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private:
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std::deque<ByteStream*> freeByteStreams;
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boost::mutex mutex;
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uint maxBufferSize;
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uint maxFreeBuffers;
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};
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} // namespace messageqcpp
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