vitess.io/vitess@v0.16.2/go/vt/vtorc/inst/postponed_functions.go (about)

     1  /*
     2     Copyright 2015 Shlomi Noach, courtesy Booking.com
     3  
     4     Licensed under the Apache License, Version 2.0 (the "License");
     5     you may not use this file except in compliance with the License.
     6     You may obtain a copy of the License at
     7  
     8         http://www.apache.org/licenses/LICENSE-2.0
     9  
    10     Unless required by applicable law or agreed to in writing, software
    11     distributed under the License is distributed on an "AS IS" BASIS,
    12     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13     See the License for the specific language governing permissions and
    14     limitations under the License.
    15  */
    16  
    17  package inst
    18  
    19  import (
    20  	"sync"
    21  
    22  	"vitess.io/vitess/go/vt/log"
    23  )
    24  
    25  type PostponedFunctionsContainer struct {
    26  	waitGroup    sync.WaitGroup
    27  	mutex        sync.Mutex
    28  	descriptions []string
    29  }
    30  
    31  func NewPostponedFunctionsContainer() *PostponedFunctionsContainer {
    32  	postponedFunctionsContainer := &PostponedFunctionsContainer{
    33  		descriptions: []string{},
    34  	}
    35  	return postponedFunctionsContainer
    36  }
    37  
    38  func (postponedFuncsContainer *PostponedFunctionsContainer) AddPostponedFunction(postponedFunction func() error, description string) {
    39  	postponedFuncsContainer.mutex.Lock()
    40  	defer postponedFuncsContainer.mutex.Unlock()
    41  
    42  	postponedFuncsContainer.descriptions = append(postponedFuncsContainer.descriptions, description)
    43  
    44  	postponedFuncsContainer.waitGroup.Add(1)
    45  	go func() {
    46  		defer postponedFuncsContainer.waitGroup.Done()
    47  		_ = postponedFunction()
    48  	}()
    49  }
    50  
    51  func (postponedFuncsContainer *PostponedFunctionsContainer) Wait() {
    52  	log.Infof("PostponedFunctionsContainer: waiting on %+v postponed functions", postponedFuncsContainer.Len())
    53  	postponedFuncsContainer.waitGroup.Wait()
    54  	log.Infof("PostponedFunctionsContainer: done waiting")
    55  }
    56  
    57  func (postponedFuncsContainer *PostponedFunctionsContainer) Len() int {
    58  	postponedFuncsContainer.mutex.Lock()
    59  	defer postponedFuncsContainer.mutex.Unlock()
    60  
    61  	return len(postponedFuncsContainer.descriptions)
    62  }
    63  
    64  func (postponedFuncsContainer *PostponedFunctionsContainer) Descriptions() []string {
    65  	postponedFuncsContainer.mutex.Lock()
    66  	defer postponedFuncsContainer.mutex.Unlock()
    67  
    68  	return postponedFuncsContainer.descriptions
    69  }