github.com/pingcap/tiflow@v0.0.0-20240520035814-5bf52d54e205/dm/master/shardddl/info.go (about)

     1  // Copyright 2020 PingCAP, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  package shardddl
    15  
    16  import (
    17  	"sort"
    18  
    19  	"github.com/pingcap/tiflow/dm/pkg/shardddl/pessimism"
    20  )
    21  
    22  // PessimismInfoSlice attaches the methods of Interface to []pessimism.Info,
    23  // sorting in increasing order according to `Source` field.
    24  type PessimismInfoSlice []pessimism.Info
    25  
    26  // Len implements Sorter.Len.
    27  func (p PessimismInfoSlice) Len() int {
    28  	return len(p)
    29  }
    30  
    31  // Less implements Sorter.Less.
    32  func (p PessimismInfoSlice) Less(i, j int) bool {
    33  	return p[i].Source < p[j].Source
    34  }
    35  
    36  // Swap implements Sorter.Swap.
    37  func (p PessimismInfoSlice) Swap(i, j int) {
    38  	p[i], p[j] = p[j], p[i]
    39  }
    40  
    41  // pessimismInfoMapToSlice converts a `map[string]pessimism.Info` to `[]pessimism.Info` in increasing order according to `Source` field.
    42  func pessimismInfoMapToSlice(ifm map[string]pessimism.Info) []pessimism.Info {
    43  	ret := make(PessimismInfoSlice, 0, len(ifm))
    44  	for _, info := range ifm {
    45  		ret = append(ret, info)
    46  	}
    47  	sort.Sort(ret)
    48  	return ret
    49  }