k8s.io/apiserver@v0.31.1/pkg/admission/plugin/policy/internal/generic/informer.go (about)

     1  /*
     2  Copyright 2022 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  
    17  package generic
    18  
    19  import (
    20  	"k8s.io/apimachinery/pkg/runtime"
    21  	"k8s.io/client-go/tools/cache"
    22  )
    23  
    24  var _ Informer[runtime.Object] = informer[runtime.Object]{}
    25  
    26  type informer[T runtime.Object] struct {
    27  	cache.SharedIndexInformer
    28  	lister[T]
    29  }
    30  
    31  // Creates a generic informer around a type-erased cache.SharedIndexInformer
    32  // It is incumbent on the caller to ensure that the generic type argument is
    33  // consistent with the type of the objects stored inside the SharedIndexInformer
    34  // as they will be casted.
    35  func NewInformer[T runtime.Object](informe cache.SharedIndexInformer) Informer[T] {
    36  	return informer[T]{
    37  		SharedIndexInformer: informe,
    38  		lister:              NewLister[T](informe.GetIndexer()),
    39  	}
    40  }