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ccache/cache_test.go
Karl Seguin 40275a30c8 Ability to dynamically SetMaxSize 
To support this, rather than adding another field/channel like
`getDroppedReq`, I added a `control` channel that can be used for these
miscellaneous interactions with the worker. The control can also be
used to take over for the `donec` channel
2020-06-26 20:22:30 +08:00

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package ccache
import (
"strconv"
"testing"
"time"
. "github.com/karlseguin/expect"
)
type CacheTests struct{}
func Test_Cache(t *testing.T) {
Expectify(new(CacheTests), t)
}
func (_ CacheTests) DeletesAValue() {
cache := New(Configure())
Expect(cache.ItemCount()).To.Equal(0)
cache.Set("spice", "flow", time.Minute)
cache.Set("worm", "sand", time.Minute)
Expect(cache.ItemCount()).To.Equal(2)
cache.Delete("spice")
Expect(cache.Get("spice")).To.Equal(nil)
Expect(cache.Get("worm").Value()).To.Equal("sand")
Expect(cache.ItemCount()).To.Equal(1)
}
func (_ CacheTests) DeletesAPrefix() {
cache := New(Configure())
Expect(cache.ItemCount()).To.Equal(0)
cache.Set("aaa", "1", time.Minute)
cache.Set("aab", "2", time.Minute)
cache.Set("aac", "3", time.Minute)
cache.Set("ac", "4", time.Minute)
cache.Set("z5", "7", time.Minute)
Expect(cache.ItemCount()).To.Equal(5)
Expect(cache.DeletePrefix("9a")).To.Equal(0)
Expect(cache.ItemCount()).To.Equal(5)
Expect(cache.DeletePrefix("aa")).To.Equal(3)
Expect(cache.Get("aaa")).To.Equal(nil)
Expect(cache.Get("aab")).To.Equal(nil)
Expect(cache.Get("aac")).To.Equal(nil)
Expect(cache.Get("ac").Value()).To.Equal("4")
Expect(cache.Get("z5").Value()).To.Equal("7")
Expect(cache.ItemCount()).To.Equal(2)
}
func (_ CacheTests) OnDeleteCallbackCalled() {
onDeleteFnCalled := false
onDeleteFn := func(item *Item) {
if item.key == "spice" {
onDeleteFnCalled = true
}
}
cache := New(Configure().OnDelete(onDeleteFn))
cache.Set("spice", "flow", time.Minute)
cache.Set("worm", "sand", time.Minute)
time.Sleep(time.Millisecond * 10) // Run once to init
cache.Delete("spice")
time.Sleep(time.Millisecond * 10) // Wait for worker to pick up deleted items
Expect(cache.Get("spice")).To.Equal(nil)
Expect(cache.Get("worm").Value()).To.Equal("sand")
Expect(onDeleteFnCalled).To.Equal(true)
}
func (_ CacheTests) FetchesExpiredItems() {
cache := New(Configure())
fn := func() (interface{}, error) { return "moo-moo", nil }
cache.Set("beef", "moo", time.Second*-1)
Expect(cache.Get("beef").Value()).To.Equal("moo")
out, _ := cache.Fetch("beef", time.Second, fn)
Expect(out.Value()).To.Equal("moo-moo")
}
func (_ CacheTests) GCsTheOldestItems() {
cache := New(Configure().ItemsToPrune(10))
for i := 0; i < 500; i++ {
cache.Set(strconv.Itoa(i), i, time.Minute)
}
//let the items get promoted (and added to our list)
time.Sleep(time.Millisecond * 10)
gcCache(cache)
Expect(cache.Get("9")).To.Equal(nil)
Expect(cache.Get("10").Value()).To.Equal(10)
Expect(cache.ItemCount()).To.Equal(490)
}
func (_ CacheTests) PromotedItemsDontGetPruned() {
cache := New(Configure().ItemsToPrune(10).GetsPerPromote(1))
for i := 0; i < 500; i++ {
cache.Set(strconv.Itoa(i), i, time.Minute)
}
time.Sleep(time.Millisecond * 10) //run the worker once to init the list
cache.Get("9")
time.Sleep(time.Millisecond * 10)
gcCache(cache)
Expect(cache.Get("9").Value()).To.Equal(9)
Expect(cache.Get("10")).To.Equal(nil)
Expect(cache.Get("11").Value()).To.Equal(11)
}
func (_ CacheTests) TrackerDoesNotCleanupHeldInstance() {
cache := New(Configure().ItemsToPrune(10).Track())
for i := 0; i < 10; i++ {
cache.Set(strconv.Itoa(i), i, time.Minute)
}
item := cache.TrackingGet("0")
time.Sleep(time.Millisecond * 10)
gcCache(cache)
Expect(cache.Get("0").Value()).To.Equal(0)
Expect(cache.Get("1")).To.Equal(nil)
item.Release()
gcCache(cache)
Expect(cache.Get("0")).To.Equal(nil)
}
func (_ CacheTests) RemovesOldestItemWhenFull() {
onDeleteFnCalled := false
onDeleteFn := func(item *Item) {
if item.key == "0" {
onDeleteFnCalled = true
}
}
cache := New(Configure().MaxSize(5).ItemsToPrune(1).OnDelete(onDeleteFn))
for i := 0; i < 7; i++ {
cache.Set(strconv.Itoa(i), i, time.Minute)
}
time.Sleep(time.Millisecond * 10)
Expect(cache.Get("0")).To.Equal(nil)
Expect(cache.Get("1")).To.Equal(nil)
Expect(cache.Get("2").Value()).To.Equal(2)
Expect(onDeleteFnCalled).To.Equal(true)
Expect(cache.ItemCount()).To.Equal(5)
}
func (_ CacheTests) RemovesOldestItemWhenFullBySizer() {
cache := New(Configure().MaxSize(9).ItemsToPrune(2))
for i := 0; i < 7; i++ {
cache.Set(strconv.Itoa(i), &SizedItem{i, 2}, time.Minute)
}
time.Sleep(time.Millisecond * 10)
Expect(cache.Get("0")).To.Equal(nil)
Expect(cache.Get("1")).To.Equal(nil)
Expect(cache.Get("2")).To.Equal(nil)
Expect(cache.Get("3")).To.Equal(nil)
Expect(cache.Get("4").Value().(*SizedItem).id).To.Equal(4)
Expect(cache.GetDropped()).To.Equal(4)
Expect(cache.GetDropped()).To.Equal(0)
}
func (_ CacheTests) SetUpdatesSizeOnDelta() {
cache := New(Configure())
cache.Set("a", &SizedItem{0, 2}, time.Minute)
cache.Set("b", &SizedItem{0, 3}, time.Minute)
time.Sleep(time.Millisecond * 5)
checkSize(cache, 5)
cache.Set("b", &SizedItem{0, 3}, time.Minute)
time.Sleep(time.Millisecond * 5)
checkSize(cache, 5)
cache.Set("b", &SizedItem{0, 4}, time.Minute)
time.Sleep(time.Millisecond * 5)
checkSize(cache, 6)
cache.Set("b", &SizedItem{0, 2}, time.Minute)
time.Sleep(time.Millisecond * 5)
checkSize(cache, 4)
cache.Delete("b")
time.Sleep(time.Millisecond * 100)
checkSize(cache, 2)
}
func (_ CacheTests) ReplaceDoesNotchangeSizeIfNotSet() {
cache := New(Configure())
cache.Set("1", &SizedItem{1, 2}, time.Minute)
cache.Set("2", &SizedItem{1, 2}, time.Minute)
cache.Set("3", &SizedItem{1, 2}, time.Minute)
cache.Replace("4", &SizedItem{1, 2})
time.Sleep(time.Millisecond * 5)
checkSize(cache, 6)
}
func (_ CacheTests) ReplaceChangesSize() {
cache := New(Configure())
cache.Set("1", &SizedItem{1, 2}, time.Minute)
cache.Set("2", &SizedItem{1, 2}, time.Minute)
cache.Replace("2", &SizedItem{1, 2})
time.Sleep(time.Millisecond * 5)
checkSize(cache, 4)
cache.Replace("2", &SizedItem{1, 1})
time.Sleep(time.Millisecond * 5)
checkSize(cache, 3)
cache.Replace("2", &SizedItem{1, 3})
time.Sleep(time.Millisecond * 5)
checkSize(cache, 5)
}
func (_ CacheTests) ResizeOnTheFly() {
cache := New(Configure().MaxSize(9).ItemsToPrune(1))
for i := 0; i < 5; i++ {
cache.Set(strconv.Itoa(i), i, time.Minute)
}
cache.SetMaxSize(3)
time.Sleep(time.Millisecond * 10)
Expect(cache.GetDropped()).To.Equal(2)
Expect(cache.Get("0")).To.Equal(nil)
Expect(cache.Get("1")).To.Equal(nil)
Expect(cache.Get("2").Value()).To.Equal(2)
Expect(cache.Get("3").Value()).To.Equal(3)
Expect(cache.Get("4").Value()).To.Equal(4)
cache.Set("5", 5, time.Minute)
time.Sleep(time.Millisecond * 5)
Expect(cache.GetDropped()).To.Equal(1)
Expect(cache.Get("2")).To.Equal(nil)
Expect(cache.Get("3").Value()).To.Equal(3)
Expect(cache.Get("4").Value()).To.Equal(4)
Expect(cache.Get("5").Value()).To.Equal(5)
cache.SetMaxSize(10)
cache.Set("6", 6, time.Minute)
time.Sleep(time.Millisecond * 10)
Expect(cache.GetDropped()).To.Equal(0)
Expect(cache.Get("3").Value()).To.Equal(3)
Expect(cache.Get("4").Value()).To.Equal(4)
Expect(cache.Get("5").Value()).To.Equal(5)
Expect(cache.Get("6").Value()).To.Equal(6)
}
type SizedItem struct {
id int
s int64
}
func (s *SizedItem) Size() int64 {
return s.s
}
func checkSize(cache *Cache, sz int64) {
cache.Stop()
Expect(cache.size).To.Equal(sz)
cache.restart()
}
func gcCache(cache *Cache) {
cache.Stop()
cache.gc()
cache.restart()
}
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