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package ttlcache
import "time"
// Option sets a specific cache option.
type Option[K comparable, V any] interface {
apply(opts *options[K, V])
}
// optionFunc wraps a function and implements the Option interface.
type optionFunc[K comparable, V any] func(*options[K, V])
// apply calls the wrapped function.
func (fn optionFunc[K, V]) apply(opts *options[K, V]) {
fn(opts)
}
// options holds all available cache configuration options.
type options[K comparable, V any] struct {
capacity uint64
ttl time.Duration
loader Loader[K, V]
disableTouchOnHit bool
}
// applyOptions applies the provided option values to the option struct.
func applyOptions[K comparable, V any](v *options[K, V], opts ...Option[K, V]) {
for i := range opts {
opts[i].apply(v)
}
}
// WithCapacity sets the maximum capacity of the cache.
// It has no effect when passing into Get().
func WithCapacity[K comparable, V any](c uint64) Option[K, V] {
return optionFunc[K, V](func(opts *options[K, V]) {
opts.capacity = c
})
}
// WithTTL sets the TTL of the cache.
// It has no effect when passing into Get().
func WithTTL[K comparable, V any](ttl time.Duration) Option[K, V] {
return optionFunc[K, V](func(opts *options[K, V]) {
opts.ttl = ttl
})
}
// WithLoader sets the loader of the cache.
// When passing into Get(), it sets an epheral loader that
// is used instead of the cache's default one.
func WithLoader[K comparable, V any](l Loader[K, V]) Option[K, V] {
return optionFunc[K, V](func(opts *options[K, V]) {
opts.loader = l
})
}
// WithDisableTouchOnHit prevents the cache instance from
// extending/touching an item's expiration timestamp when it is being
// retrieved.
// When passing into Get(), it overrides the default value of the
// cache.
func WithDisableTouchOnHit[K comparable, V any]() Option[K, V] {
return optionFunc[K, V](func(opts *options[K, V]) {
opts.disableTouchOnHit = true
})
}
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