107 lines
2.9 KiB
C++
107 lines
2.9 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 OB_DTL_PROCESSOR_H
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#define OB_DTL_PROCESSOR_H
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#include "share/interrupt/ob_global_interrupt_call.h"
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#include "lib/oblog/ob_log.h"
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#include "sql/dtl/ob_dtl_msg_type.h"
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#include "sql/dtl/ob_dtl_msg.h"
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#include "sql/dtl/ob_dtl_linked_buffer.h"
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#include "common/row/ob_row_iterator.h"
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#include "sql/engine/expr/ob_expr.h"
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namespace oceanbase {
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namespace sql {
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namespace dtl {
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class ObDtlInterruptProc
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{
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public:
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virtual int process(const common::ObInterruptCode &ic) = 0;
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};
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class ObDtlMsgIterator
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{
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public:
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virtual bool has_next() = 0;
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virtual void set_iterator_end() = 0;
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virtual int get_next_row(common::ObNewRow &row) = 0;
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virtual int get_next_row(const ObIArray<ObExpr*> &exprs, ObEvalCtx &eval_ctx) = 0;
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};
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class ObDtlPacketProcBase
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{
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public:
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virtual ~ObDtlPacketProcBase() = default;
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virtual ObDtlMsgType get_proc_type() const = 0;
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virtual int process(const ObDtlLinkedBuffer &buffer, bool &transferred) = 0;
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};
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template <class Packet>
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class ObDtlPacketProc
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: public ObDtlPacketProcBase
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{
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public:
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ObDtlMsgType get_proc_type() const override { return Packet::type(); }
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int decode(const ObDtlLinkedBuffer &buffer);
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int process(const ObDtlLinkedBuffer &buffer, bool &transferred) override;
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virtual int init(const ObDtlLinkedBuffer &buffer) { UNUSED(buffer); return common::OB_SUCCESS; }
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private:
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virtual int process(const Packet &pkt) = 0;
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private:
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Packet pkt_;
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};
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template <class Packet>
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int ObDtlPacketProc<Packet>::decode(const ObDtlLinkedBuffer &buffer)
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{
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using common::OB_SUCCESS;
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int ret = OB_SUCCESS;
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const char *buf = buffer.buf();
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int64_t size = buffer.size();
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int64_t &pos = buffer.pos();
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if (OB_FAIL(common::serialization::decode(buf, size, pos, pkt_))) {
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SQL_DTL_LOG(WARN, "decode DTL packet fail", K(size), K(pos));
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} else {
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}
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return ret;
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}
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template <class Packet>
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int ObDtlPacketProc<Packet>::process(const ObDtlLinkedBuffer &buffer, bool &transferred)
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{
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int ret = common::OB_SUCCESS;
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transferred = false;
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if (buffer.pos() == buffer.size()) {
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// last row
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ret = OB_ITER_END;
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} else if (OB_SUCC(decode(buffer))) {
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ret = process(pkt_);
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}
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// packet 处理完成后需要释放内存
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// 否则会有内存泄漏
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//
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// 无论处理是否成功，都需要reset对应的packet
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pkt_.reset();
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return ret;
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}
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} // dtl
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} // sql
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} // oceanbase
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#endif /* OB_DTL_PROCESSOR_H */
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