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/* - mode: c; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2010 Jay Pipes <jaypipes@gmail.com>
*
* Authors:
*
* Jay Pipes <jaypipes@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
*
* Defines a simple structure for maintaining a write buffer.
*/
#pragma once
#include <boost/noncopyable.hpp>
#include <stdint.h>
#include <vector>
#include <pthread.h>
class WriteBuffer : boost::noncopyable
{
public:
static const size_t DEFAULT_WRITE_BUFFER_SIZE= 1024; /* Many GPB messages are < 1 KB... */
/**
* Constructor.
*/
WriteBuffer();
~WriteBuffer();
/**
* Locks the log write buffer
*/
void lock()
{
pthread_mutex_lock(&latch);
}
/**
* Unlocks the log's write buffer
*/
void unlock()
{
pthread_mutex_unlock(&latch);
}
/**
* Resizes the internal raw byte buffer
*
* @param[in] New size to allocate
*/
void resize(size_t new_size);
/**
* Returns the pointer to the raw bytes.
*/
uint8_t *getRawBytes()
{
return &buffer[0];
}
/**
* Returns the size of the write buffer
*/
size_t getCapacity()
{
return buffer.size();
}
private:
std::vector<uint8_t> buffer; ///< Raw memory buffer managed by the log
pthread_mutex_t latch; ///< Lock around the synchronized parts of the log (the write buffer)
};
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