124 lines
4.8 KiB
C++
124 lines
4.8 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_REPLICA_COMPARE_H
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#define OCEANBASE_SQL_OB_REPLICA_COMPARE_H
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#include "share/ob_define.h"
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#include "sql/optimizer/ob_route_policy.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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class ObReplicaCompare
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{
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public:
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enum CompareType
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{
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IS_OTHER_REGION,
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ZONE_TYPE,
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MERGE_STATUS,
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POS_TYPE,
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CMP_CNT
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};
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enum CompareRes
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{
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EQUAL,
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LESS,
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GREATER
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};
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public:
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explicit ObReplicaCompare(ObRoutePolicyType policy_type);
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virtual ~ObReplicaCompare() {}
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bool operator()(const ObRoutePolicy::CandidateReplica &replica1, const ObRoutePolicy::CandidateReplica &replica2);
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int get_sort_ret() const { return ret_; }
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inline CompareRes compare_other_region(const ObRoutePolicy::CandidateReplica &replica1,
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const ObRoutePolicy::CandidateReplica &replica2);
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inline CompareRes compare_zone_type(const ObRoutePolicy::CandidateReplica &replica1,
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const ObRoutePolicy::CandidateReplica &replica2);
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inline CompareRes compare_merge_status(const ObRoutePolicy::CandidateReplica &replica1,
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const ObRoutePolicy::CandidateReplica &replica2);
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inline CompareRes compare_pos_type(const ObRoutePolicy::CandidateReplica &replica1,
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const ObRoutePolicy::CandidateReplica &replica2);
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typedef CompareRes (ObReplicaCompare::*CmpFuncPtr)(const ObRoutePolicy::CandidateReplica &replica1,
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const ObRoutePolicy::CandidateReplica &replica2);
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private:
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int ret_;
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ObRoutePolicyType policy_type_;
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CmpFuncPtr cmp_func_array_[CMP_CNT];
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CompareType readonly_zone_first_[CMP_CNT];
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CompareType only_readonly_zone_[CMP_CNT];
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CompareType unmerge_zone_first_[CMP_CNT];
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};
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ObReplicaCompare::CompareRes ObReplicaCompare::compare_other_region(const ObRoutePolicy::CandidateReplica &replica1,
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const ObRoutePolicy::CandidateReplica &replica2)
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{
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CompareRes cmp_ret = EQUAL;
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if (replica1.attr_.pos_type_ != ObRoutePolicy::OTHER_REGION
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&& replica2.attr_.pos_type_ == ObRoutePolicy::OTHER_REGION) {
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cmp_ret = LESS;
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} else if (replica1.attr_.pos_type_ == ObRoutePolicy::OTHER_REGION
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&& replica2.attr_.pos_type_ != ObRoutePolicy::OTHER_REGION) {
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cmp_ret = GREATER;
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} else {/*do nothing*/}
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return cmp_ret;
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}
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ObReplicaCompare::CompareRes ObReplicaCompare::compare_zone_type(const ObRoutePolicy::CandidateReplica &replica1,
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const ObRoutePolicy::CandidateReplica &replica2)
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{
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CompareRes cmp_ret = EQUAL;
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if (replica1.attr_.zone_type_ == common::ZONE_TYPE_READONLY
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&& replica2.attr_.zone_type_ != common::ZONE_TYPE_READONLY) {
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cmp_ret = LESS;
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} else if (replica1.attr_.zone_type_ != common::ZONE_TYPE_READONLY
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&& replica2.attr_.zone_type_ == common::ZONE_TYPE_READONLY) {
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cmp_ret = GREATER;
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} else {/*do nothing*/}
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return cmp_ret;
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}
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ObReplicaCompare::CompareRes ObReplicaCompare::compare_merge_status(const ObRoutePolicy::CandidateReplica &replica1,
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const ObRoutePolicy::CandidateReplica &replica2)
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{
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CompareRes cmp_ret = EQUAL;
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if (replica1.attr_.merge_status_ != ObRoutePolicy::MERGING
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&& replica2.attr_.merge_status_ == ObRoutePolicy::MERGING) {
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cmp_ret = LESS;
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} else if (replica1.attr_.merge_status_ == ObRoutePolicy::MERGING
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&& replica2.attr_.merge_status_ != ObRoutePolicy::MERGING) {
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cmp_ret = GREATER;
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} else {/*do nothing*/}
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return cmp_ret;
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}
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ObReplicaCompare::CompareRes ObReplicaCompare::compare_pos_type(const ObRoutePolicy::CandidateReplica &replica1,
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const ObRoutePolicy::CandidateReplica &replica2)
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{
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CompareRes cmp_ret = EQUAL;
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if ((replica1.attr_.pos_type_ == ObRoutePolicy::SAME_SERVER || replica1.attr_.pos_type_ == ObRoutePolicy::SAME_IDC)
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&& replica2.attr_.pos_type_ == ObRoutePolicy::SAME_REGION) {
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cmp_ret = LESS;
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} else if ((replica2.attr_.pos_type_ == ObRoutePolicy::SAME_SERVER || replica2.attr_.pos_type_ == ObRoutePolicy::SAME_IDC)
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&& replica1.attr_.pos_type_ == ObRoutePolicy::SAME_REGION ) {
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cmp_ret = GREATER;
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} else {/*do nohtong*/ }
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return cmp_ret;
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}
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}//sql
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}//oceanbase
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#endif
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