github.com/jingruilea/kubeedge@v1.2.0-beta.0.0.20200410162146-4bb8902b3879/edge/pkg/edged/volume/csi/csi_drivers_store.go (about)

     1  /*
     2  Copyright 2019 The Kubernetes Authors.
     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  KubeEdge Authors: To create mini-kubelet for edge deployment scenario,
    17  this file is derived from kubernetes v1.15.3,
    18  and the full file path is k8s.io/kubernetes/pkg/volume/csi/csi_drivers_store.go
    19  */
    20  
    21  package csi
    22  
    23  import (
    24  	"sync"
    25  
    26  	utilversion "k8s.io/apimachinery/pkg/util/version"
    27  )
    28  
    29  // Driver is a description of a CSI Driver, defined by an endpoint and the
    30  // highest CSI version supported
    31  type Driver struct {
    32  	endpoint                string
    33  	highestSupportedVersion *utilversion.Version
    34  }
    35  
    36  // DriversStore holds a list of CSI Drivers
    37  type DriversStore struct {
    38  	store
    39  	sync.RWMutex
    40  }
    41  
    42  type store map[string]Driver
    43  
    44  // Get lets you retrieve a CSI Driver by name.
    45  // This method is protected by a mutex.
    46  func (s *DriversStore) Get(driverName string) (Driver, bool) {
    47  	s.RLock()
    48  	defer s.RUnlock()
    49  
    50  	driver, ok := s.store[driverName]
    51  	return driver, ok
    52  }
    53  
    54  // Set lets you save a CSI Driver to the list and give it a specific name.
    55  // This method is protected by a mutex.
    56  func (s *DriversStore) Set(driverName string, driver Driver) {
    57  	s.Lock()
    58  	defer s.Unlock()
    59  
    60  	if s.store == nil {
    61  		s.store = store{}
    62  	}
    63  
    64  	s.store[driverName] = driver
    65  }
    66  
    67  // Delete lets you delete a CSI Driver by name.
    68  // This method is protected by a mutex.
    69  func (s *DriversStore) Delete(driverName string) {
    70  	s.Lock()
    71  	defer s.Unlock()
    72  
    73  	delete(s.store, driverName)
    74  }
    75  
    76  // Clear deletes all entries in the store.
    77  // This methiod is protected by a mutex.
    78  func (s *DriversStore) Clear() {
    79  	s.Lock()
    80  	defer s.Unlock()
    81  
    82  	s.store = store{}
    83  }