85 lines
2.4 KiB
C++
85 lines
2.4 KiB
C++
/**
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* Copyright (c) 2021 OceanBase
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* OceanBase CE is licensed under Mulan PubL v2.
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* You can use this software according to the terms and conditions of the Mulan PubL v2.
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* You may obtain a copy of Mulan PubL v2 at:
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* http://license.coscl.org.cn/MulanPubL-2.0
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* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
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* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
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* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
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* See the Mulan PubL v2 for more details.
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*/
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#ifndef OCEANBASE_SQL_OB_SQL_EXPRESSION_FACTORY_H
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#define OCEANBASE_SQL_OB_SQL_EXPRESSION_FACTORY_H
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#include "lib/container/ob_array.h"
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namespace oceanbase
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{
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namespace sql
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{
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//不提供free(sql-expression)的接口，请在alloc上面统一释放
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//最好expr_op和sql-expression使用同一个alloc, 否则要求要求用户
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//单独释放expr_op占用的空间
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class ObSqlExpressionFactory
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{
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public:
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explicit ObSqlExpressionFactory(common::ObIAllocator &alloc) : alloc_(alloc)
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{}
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~ObSqlExpressionFactory()
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{
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}
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template<typename T>
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int alloc(T *&sql_expression)
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{
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int ret = common::OB_SUCCESS;
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void *ptr = NULL;
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int64_t item_count = 0;
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if (OB_ISNULL(ptr = (alloc_.alloc(sizeof(T))))) {
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ret = common::OB_ALLOCATE_MEMORY_FAILED;
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SQL_ENG_LOG(ERROR, "fail to alloc memory", K(ret), K(ptr));
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} else {
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sql_expression = new(ptr)T(alloc_, item_count);
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}
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return ret;
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}
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template<typename T>
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int alloc(T *&sql_expression, int64_t item_count)
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{
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int ret = common::OB_SUCCESS;
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void *ptr = NULL;
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if (OB_ISNULL(ptr = (alloc_.alloc(sizeof(T))))) {
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ret = common::OB_ALLOCATE_MEMORY_FAILED;
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SQL_ENG_LOG(ERROR, "fail to alloc memory", K(ret), K(ptr));
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} else {
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sql_expression = new(ptr)T(alloc_, item_count);
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}
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return ret;
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}
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void destroy()
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{
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//nothing todo
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//所有内存都在alloc上面，由alloc统一释放
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}
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//template<typename T>
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// void free(T *&sql_expression)
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// {
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// if (OB_ISNULL(sql_expression)) {
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// } else {
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// sql_expression->~ObSqlExpression();
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// alloc_.free(sql_expression);
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// sql_expression = NULL;
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// }
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// }
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private:
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DISALLOW_COPY_AND_ASSIGN(ObSqlExpressionFactory);
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private:
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common::ObIAllocator &alloc_;
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};
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} //namespace sql
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} //namespace oceanbase
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#endif
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