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package xpath
import (
"errors"
"fmt"
"math/rand"
"strconv"
"testing"
)
func TestLoadingCache(t *testing.T) {
c := NewLoadingCache(
func(key interface{}) (interface{}, error) {
switch v := key.(type) {
case int:
return strconv.Itoa(v), nil
default:
return nil, errors.New("invalid type")
}
},
2) // cap = 2
assertEqual(t, 0, len(c.m))
v, err := c.get(1)
assertNoErr(t, err)
assertEqual(t, "1", v)
assertEqual(t, 1, len(c.m))
v, err = c.get(1)
assertNoErr(t, err)
assertEqual(t, "1", v)
assertEqual(t, 1, len(c.m))
v, err = c.get(2)
assertNoErr(t, err)
assertEqual(t, "2", v)
assertEqual(t, 2, len(c.m))
// over capacity, m is reset
v, err = c.get(3)
assertNoErr(t, err)
assertEqual(t, "3", v)
assertEqual(t, 1, len(c.m))
// Invalid capacity
assertPanic(t, func() {
NewLoadingCache(func(key interface{}) (interface{}, error) { return key, nil }, -1)
})
// Loading failure
c = NewLoadingCache(
func(key interface{}) (interface{}, error) {
if key.(int)%2 == 0 {
return key, nil
} else {
return nil, fmt.Errorf("artificial error: %d", key.(int))
}
}, 0)
v, err = c.get(12)
assertNoErr(t, err)
assertEqual(t, 12, v)
_, err = c.get(21)
assertErr(t, err)
assertEqual(t, "artificial error: 21", err.Error())
}
const (
benchLoadingCacheRandSeed = 12345
benchLoadingCacheConcurrency = 5
benchLoadingCacheKeyRange = 2000
benchLoadingCacheCap = 1000
)
func BenchmarkLoadingCacheCapped_SingleThread(b *testing.B) {
rand.Seed(benchLoadingCacheRandSeed)
c := NewLoadingCache(
func(key interface{}) (interface{}, error) {
return key, nil
}, benchLoadingCacheCap)
for i := 0; i < b.N; i++ {
k := rand.Intn(benchLoadingCacheKeyRange)
v, _ := c.get(k)
if k != v {
b.FailNow()
}
}
b.Logf("N=%d, reset=%d", b.N, c.reset)
}
func BenchmarkLoadingCacheCapped_MultiThread(b *testing.B) {
rand.Seed(benchLoadingCacheRandSeed)
c := NewLoadingCache(
func(key interface{}) (interface{}, error) {
return key, nil
}, benchLoadingCacheCap)
errCh := make(chan error, benchLoadingCacheConcurrency)
defer close(errCh)
for i := 0; i < benchLoadingCacheConcurrency; i++ {
go func() {
for j := 0; j < b.N; j++ {
k := rand.Intn(benchLoadingCacheKeyRange)
v, _ := c.get(k)
if k != v {
errCh <- fmt.Errorf("key:%q != value:%q", k, v)
return
}
}
errCh <- nil
return
}()
}
for i := 0; i < benchLoadingCacheConcurrency; i++ {
if err := <-errCh; err != nil {
b.Fatal(err)
}
}
b.Logf("N=%d, concurrency=%d, reset=%d", b.N, benchLoadingCacheConcurrency, c.reset)
}
func BenchmarkLoadingCacheNoCap_SingleThread(b *testing.B) {
rand.Seed(benchLoadingCacheRandSeed)
c := NewLoadingCache(
func(key interface{}) (interface{}, error) {
return key, nil
}, 0) // 0 => no cap
for i := 0; i < b.N; i++ {
k := rand.Intn(benchLoadingCacheKeyRange)
v, _ := c.get(k)
if k != v {
b.FailNow()
}
}
b.Logf("N=%d, reset=%d", b.N, c.reset)
}
func BenchmarkLoadingCacheNoCap_MultiThread(b *testing.B) {
rand.Seed(benchLoadingCacheRandSeed)
c := NewLoadingCache(
func(key interface{}) (interface{}, error) {
return key, nil
}, 0) // 0 => no cap
errCh := make(chan error, benchLoadingCacheConcurrency)
defer close(errCh)
for i := 0; i < benchLoadingCacheConcurrency; i++ {
go func() {
for j := 0; j < b.N; j++ {
k := rand.Intn(benchLoadingCacheKeyRange)
v, _ := c.get(k)
if k != v {
errCh <- fmt.Errorf("key:%q != value:%q", k, v)
return
}
}
errCh <- nil
return
}()
}
for i := 0; i < benchLoadingCacheConcurrency; i++ {
if err := <-errCh; err != nil {
b.Fatal(err)
}
}
b.Logf("N=%d, concurrency=%d, reset=%d", b.N, benchLoadingCacheConcurrency, c.reset)
}
func TestGetRegexp(t *testing.T) {
RegexpCache = defaultRegexpCache()
assertEqual(t, 0, len(RegexpCache.m))
assertEqual(t, defaultCap, RegexpCache.cap)
exp, err := getRegexp("^[0-9]{3,5}$")
assertNoErr(t, err)
assertTrue(t, exp.MatchString("3141"))
assertFalse(t, exp.MatchString("3"))
exp, err = getRegexp("[invalid")
assertErr(t, err)
assertEqual(t, "error parsing regexp: missing closing ]: `[invalid`", err.Error())
assertNil(t, exp)
}
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