woodpecker/vendor/github.com/djherbis/fscache/reaper.go

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2016-04-13 00:27:24 +00:00
package fscache
import "time"
// Reaper is used to control when streams expire from the cache.
// It is called once right after loading, and then it is run
// again after every Next() period of time.
type Reaper interface {
// Returns the amount of time to wait before the next scheduled Reaping.
Next() time.Duration
// Given a key and the last r/w times of a file, return true
// to remove the file from the cache, false to keep it.
Reap(key string, lastRead, lastWrite time.Time) bool
}
// NewReaper returns a simple reaper which runs every "period"
// and reaps files which are older than "expiry".
func NewReaper(expiry, period time.Duration) Reaper {
return &reaper{
expiry: expiry,
period: period,
}
}
type reaper struct {
period time.Duration
expiry time.Duration
}
func (g *reaper) Next() time.Duration {
return g.period
}
func (g *reaper) Reap(key string, lastRead, lastWrite time.Time) bool {
return lastRead.Before(time.Now().Add(-g.expiry))
}