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// OpenRDAP
// Copyright 2017 Tom Harwood
// MIT License, see the LICENSE file.
// Package cache implements RDAP Service Registry file caching.
//
// There are two separate implementations: MemoryCache and DiskCache.
package cache
import "time"
type FileState int
const (
// File is not in the cache.
Absent FileState = iota
// File is in the cache. The latest version has already accessed (Load or Saved()).
Good
// File is in the cache. A newer version of is available to be Load()'ed.
//
// This is used by DiskCache, which uses a shared cache directory.
ShouldReload
// File is in the cache, but has expired. It still can be Load()'ed.
Expired
)
func (f FileState) String() string {
switch f {
case Absent:
return "not cached"
case Good, ShouldReload:
return "good"
case Expired:
return "expired"
default:
panic("Unknown FileState")
}
}
// A RegistryCache implements a cache of Service Registry files.
type RegistryCache interface {
Load(filename string) ([]byte, error)
Save(filename string, data []byte) error
State(filename string) FileState
SetTimeout(timeout time.Duration)
}
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