github.com/vescale/zgraph@v0.0.0-20230410094002-959c02d50f95/storage/resolver/notifier.go (about)

     1  // Copyright 2022 zGraph 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 resolver
    16  
    17  import "sync"
    18  
    19  // Notifier is used to notify the task finished.
    20  type Notifier interface {
    21  	Notify(err error)
    22  	Wait() []error
    23  }
    24  
    25  type MultiKeysNotifier struct {
    26  	wg   sync.WaitGroup
    27  	mu   sync.RWMutex
    28  	errs []error
    29  }
    30  
    31  func NewMultiKeysNotifier(size int) Notifier {
    32  	n := &MultiKeysNotifier{}
    33  	n.wg.Add(size)
    34  	return n
    35  }
    36  
    37  func (s *MultiKeysNotifier) Notify(err error) {
    38  	s.wg.Done()
    39  	if err != nil {
    40  		s.errs = append(s.errs, err)
    41  	}
    42  }
    43  
    44  func (s *MultiKeysNotifier) Wait() []error {
    45  	s.wg.Wait()
    46  	s.mu.RLock()
    47  	defer s.mu.RUnlock()
    48  	return s.errs
    49  }