github.com/pingcap/br@v5.3.0-alpha.0.20220125034240-ec59c7b6ce30+incompatible/pkg/mock/mockid/mockid.go (about)

     1  // Copyright 2019 TiKV Project Authors.
     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 mockid
    15  
    16  import "sync/atomic"
    17  
    18  // IDAllocator mocks IDAllocator and it is only used for test.
    19  type IDAllocator struct {
    20  	base uint64
    21  }
    22  
    23  // NewIDAllocator creates a new IDAllocator.
    24  func NewIDAllocator() *IDAllocator {
    25  	return &IDAllocator{base: 0}
    26  }
    27  
    28  // Alloc returns a new id.
    29  func (alloc *IDAllocator) Alloc() (uint64, error) {
    30  	return atomic.AddUint64(&alloc.base, 1), nil
    31  }
    32  
    33  // Rebase implements the IDAllocator interface.
    34  func (alloc *IDAllocator) Rebase() error {
    35  	return nil
    36  }