github.com/m3db/m3@v1.5.0/src/x/cache/nop_cache.go (about)

     1  // Copyright (c) 2020 Uber Technologies, Inc.
     2  //
     3  // Permission is hereby granted, free of charge, to any person obtaining a copy
     4  // of this software and associated documentation files (the "Software"), to deal
     5  // in the Software without restriction, including without limitation the rights
     6  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     7  // copies of the Software, and to permit persons to whom the Software is
     8  // furnished to do so, subject to the following conditions:
     9  //
    10  // The above copyright notice and this permission notice shall be included in
    11  // all copies or substantial portions of the Software.
    12  //
    13  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    14  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    15  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    16  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    17  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    18  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    19  // THE SOFTWARE.
    20  
    21  package cache
    22  
    23  import (
    24  	"context"
    25  	"time"
    26  )
    27  
    28  // NewNoop returns a new no-op cache.
    29  func NewNoop() Cache {
    30  	return &noopCache{}
    31  }
    32  
    33  type noopCache struct{}
    34  
    35  func (n *noopCache) Put(_ string, _ interface{})                           {}
    36  func (n *noopCache) PutWithTTL(_ string, _ interface{}, ttl time.Duration) {}
    37  
    38  func (n *noopCache) Get(ctx context.Context, key string, loader LoaderFunc) (interface{}, error) {
    39  	return loader(ctx, key)
    40  }
    41  
    42  func (n *noopCache) GetWithTTL(ctx context.Context, key string, loader LoaderWithTTLFunc) (interface{}, error) {
    43  	val, _, err := loader(ctx, key)
    44  	return val, err
    45  }
    46  
    47  var _ Cache = &noopCache{}