While the ConditionalPut processing could be implemented via direct key-based IQueryCache operations, it is more efficient and enforces concurrency control without explicit locking.

            

              

                
IInvocableCache
                
IConcurrentCache
              
              

                
filter = PresentFilter.Instance;
            cache.Invoke(key, new ConditionalPut(filter, value));
                
cache.Replace(key, value);
              
              

                
filter = new NotFilter(PresentFilter.Instance);
            cache.Invoke(key, new ConditionalPut(filter, value));
                
cache.PutIfAbsent(key, value);
              
              

                
filter = new EqualsFilter(IdentityExtractor.Instance, valueOld);
            cache.Invoke(key, new ConditionalPut(filter, valueNew));
                
cache.Replace(key, valueOld, valueNew);
              
            
          

Obviously, using more specific, fine-tuned filters (rather than ones based on the IdentityExtractor may provide additional flexibility and efficiency allowing the put operation to be performed conditionally on values of specific attributes (or even calculations) instead of the entire object.