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ncache_test.go
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ncache_test.go
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package ncache
import (
"context"
"math/rand"
"reflect"
"runtime"
"strconv"
"testing"
"time"
)
func TestLRU(t *testing.T) {
for _, test := range []struct {
Name string
Key, Value string
SkipSet bool
TTL, StaleFor time.Duration
WaitTime time.Duration
ExpectedValue string
ExpectStale, ExpectOk bool
}{
{
Name: "Missing",
SkipSet: true,
},
{
Name: "NoTTL",
Key: "hello",
Value: "world",
ExpectedValue: "world",
ExpectOk: true,
},
{
Name: "WithTTL",
Key: "hello",
Value: "world",
TTL: 3 * time.Second,
ExpectedValue: "world",
ExpectOk: true,
},
{
Name: "WithExpiredTTL",
Key: "hello",
Value: "world",
TTL: 3 * time.Second,
WaitTime: 5 * time.Second,
ExpectOk: false,
},
{
Name: "WithExpiredTTLAndStalePeriod",
Key: "hello",
Value: "world",
TTL: 3 * time.Second,
StaleFor: 3 * time.Second,
WaitTime: 5 * time.Second,
ExpectedValue: "world",
ExpectStale: true,
ExpectOk: true,
},
{
Name: "WithExpiredTTLAndExpiredStalePeriod",
Key: "hello",
Value: "world",
TTL: 3 * time.Second,
StaleFor: 2 * time.Second,
WaitTime: 5 * time.Second,
ExpectOk: false,
},
} {
test := test
t.Run(test.Name, func(t *testing.T) {
now := time.Now()
c := NewLRU(4)
c.nowFunc = func() time.Time { return now }
if !test.SkipSet {
if err := c.Set(context.Background(), test.Key, test.Value, test.TTL, test.StaleFor); err != nil {
t.Fatalf("failed to set value for key %q: %s", test.Key, err)
}
}
now = now.Add(test.WaitTime)
gotValue, gotStale, gotOk := c.Get(context.Background(), test.Key)
if gotOk != test.ExpectOk {
t.Fatalf("expected ok=%v, got ok=%v", test.ExpectOk, gotOk)
}
if gotOk && !reflect.DeepEqual(gotValue, test.ExpectedValue) {
t.Errorf("expected val=%q, got val=%q", test.ExpectedValue, gotValue)
}
if gotStale != test.ExpectStale {
t.Errorf("expected stale=%v, got stale=%v", test.ExpectStale, gotStale)
}
if test.ExpectOk && c.Size() != 1 {
t.Errorf("expected .Size()=%d, got .Size()=%d", 1, c.Size())
} else if !test.ExpectOk && c.Size() != 0 {
t.Errorf("expected .Size()=%d, got .Size()=%d", 0, c.Size())
}
})
}
}
func TestLRURemoval(t *testing.T) {
c := NewLRU(4)
mustSet := func(key string, val string) {
t.Helper()
if err := c.Set(context.Background(), key, val, 0, 0); err != nil {
t.Fatalf("failed to set key %q: %s", key, err)
}
}
mustGet := func(key string, expected string) {
t.Helper()
value, _, ok := c.Get(context.Background(), key)
if !ok {
t.Errorf("expected ok=%v, got ok=%v", true, ok)
}
if !reflect.DeepEqual(value, expected) {
t.Errorf("expected val=%q, got val=%q", expected, value)
}
}
mustNotGet := func(key string) {
t.Helper()
value, _, ok := c.Get(context.Background(), key)
if ok {
t.Errorf("expected ok=%v, got ok=%v", false, ok)
}
if value != nil {
t.Errorf("expected val=nil, got val=%q", value)
}
}
mustSet("#1", "v1")
mustSet("#2", "v2")
mustSet("#3", "v3")
mustSet("#4", "v4")
mustGet("#1", "v1")
mustGet("#2", "v2")
mustGet("#3", "v3")
mustGet("#4", "v4")
mustSet("#5", "v5")
mustGet("#5", "v5")
mustGet("#4", "v4")
mustGet("#3", "v3")
mustGet("#2", "v2")
mustNotGet("#1")
mustSet("#6", "v6")
mustGet("#6", "v6")
mustNotGet("#5")
mustGet("#4", "v4")
mustGet("#3", "v3")
mustGet("#2", "v2")
mustSet("#6", "v6.1")
mustSet("#7", "v7")
mustGet("#7", "v7")
mustGet("#6", "v6.1")
mustNotGet("#4")
mustGet("#3", "v3")
mustGet("#2", "v2")
}
func BenchmarkLRU_Get(b *testing.B) {
size := runtime.GOMAXPROCS(0)
if size > 1 {
size = size / 2
}
c := NewLRU(size)
b.RunParallel(func(pb *testing.PB) {
key := "key#" + strconv.Itoa(rand.Int())
if err := c.Set(context.Background(), key, key, 0, 0); err != nil {
b.Fatalf("failed to set key %q: %s", key, err)
}
for pb.Next() {
_, _, _ = c.Get(context.Background(), key)
}
})
}
func BenchmarkLRU_Set(b *testing.B) {
size := runtime.GOMAXPROCS(0)
if size > 1 {
size = size / 2
}
c := NewLRU(size)
b.RunParallel(func(pb *testing.PB) {
key := "key#" + strconv.Itoa(rand.Int())
if err := c.Set(context.Background(), key, key, 0, 0); err != nil {
b.Fatalf("failed to set key %q: %s", key, err)
}
for pb.Next() {
_ = c.Set(context.Background(), key, key, 0, 0)
}
})
}