ims_obj_pool.h
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/*
* Copyright 2002-2014 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* CC/LICENSE
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef __IMS_OBJ_POOL_H_
#define __IMS_OBJ_POOL_H_
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdint.h>
#include <string.h>
#include <new>
#include <bgcc.h>
/**
* @brief 简单线程安全对象管理器
* 初始化的时候默认构造好所有的对象
* 反初始化的时候，释放所有对象
* 避免频繁的new/delete
*
*/
template< typename T >
class ims_obj_pool {
typedef void CALLBACK(T*);
public:
~ims_obj_pool() {
uninit();
}
/**
* @brief 初始化对象池
*
* @param [in] obj_count : uint32_t
* @return bool
* @retval
* @see
* @note
* @author chenyuzhen
* @date 2013/01/05 14:22:54
**/
bool init(uint32_t obj_count) {
_inited = false;
if (!obj_count) {
return false;
}
bgcc::Guard<bgcc::Mutex> lock(&_mutex);
if (obj_count % 8) {
_free_count = _count = (obj_count & (~0x7)) + 0x8;
} else {
_free_count = _count = obj_count;
}
_bit = new(std::nothrow)char[_count];
if (!_bit) {
return false;
}
memset(_bit, '0', _count);
_objs = new(std::nothrow) T[_count];
if (!_objs) {
delete []_bit;
return false;
}
return (_inited = true);
}
/**
* @brief 反初始化对象池
*
* @return bool
* @retval
* @see
* @note
* @author chenyuzhen
* @date 2013/01/05 14:23:13
**/
bool uninit() {
if (!_inited) {
return false;
}
bgcc::Guard<bgcc::Mutex> lock(&_mutex);
delete [] _objs;
delete [] _bit;
_objs = NULL;
_bit = NULL;
return (_inited = false);
}
/**
* @brief 从内存池获取对象
*
* @param [in/out] callback : CALLBACK*
* @return T*
* @retval
* @see
* @note
* @author chenyuzhen
* @date 2013/01/09 16:27:24
**/
T* get(CALLBACK* callback = NULL) {
bgcc::Guard<bgcc::Mutex> lock(&_mutex);
if (!_inited || !_free_count) {
return NULL;
}
if (!_free_count) {
return NULL;
}
char* ptmp = _bit;
while (ptmp != (_bit + _count)) {
if ('0' == *ptmp) {
*ptmp = '1';
_free_count--;
if (callback) {
callback(_objs + (ptmp - _bit));
}
return _objs + (ptmp - _bit);
}
ptmp++;
}
return NULL;
}
/**
* @brief 释放对象到内存池
*
* @param [in/out] obj : T**
* @param [in/out] callback : CALLBACK*
* @return void
* @retval
* @see
* @note
* @author chenyuzhen
* @date 2013/01/09 16:27:29
**/
void put(T** obj, CALLBACK* callback = NULL) {
bgcc::Guard<bgcc::Mutex> lock(&_mutex);
if (!_inited || _free_count == _count) {
return;
}
T* tmp = *obj;
if (tmp - _objs < 0 || tmp - _objs >= _count) {
return;
}
*obj = NULL;
_bit[tmp - _objs] = '0';
_free_count++;
if (callback) {
callback(tmp);
}
}
private:
char* _bit; ///<使用标志位
T* _objs; ///<对象列表
uint32_t _count; ///<对象总数
uint32_t _free_count; ///<可用对象个数
bool _inited; ///< 是否已经完成初始化，防止多次初始化
bgcc::Mutex _mutex; ///< 对象池互斥锁
};
#endif //__IMS_OBJ_POOL_H_
/* vim: set expandtab ts=4 sw=4 sts=4 tw=100: */