github.com/XiaoMi/Gaea@v1.2.5/proxy/sequence/sequence.go (about)

     1  // Copyright 2019 The Gaea Authors. All Rights Reserved.
     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  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package sequence
    16  
    17  import "fmt"
    18  
    19  // Sequence is interface of global sequences with different types
    20  type Sequence interface {
    21  	GetPKName() string
    22  	NextSeq() (int64, error)
    23  }
    24  
    25  type SequenceManager struct {
    26  	sequences map[string]map[string]Sequence
    27  }
    28  
    29  func NewSequenceManager() *SequenceManager {
    30  	return &SequenceManager{
    31  		sequences: make(map[string]map[string]Sequence),
    32  	}
    33  }
    34  
    35  func (s *SequenceManager) SetSequence(db, table string, seq Sequence) error {
    36  	if _, ok := s.sequences[db]; !ok {
    37  		s.sequences[db] = make(map[string]Sequence)
    38  	}
    39  	if _, ok := s.sequences[db][table]; ok {
    40  		return fmt.Errorf("already set sequence, db: %s, table: %s", db, table)
    41  	}
    42  
    43  	s.sequences[db][table] = seq
    44  	return nil
    45  }
    46  
    47  func (s *SequenceManager) GetSequence(db, table string) (Sequence, bool) {
    48  	dbSeq, ok := s.sequences[db]
    49  	if !ok {
    50  		return nil, false
    51  	}
    52  	seq, ok := dbSeq[table]
    53  	return seq, ok
    54  }