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hashmap_test.go
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package hashmap
import (
"bytes"
"crypto/rand"
"encoding/hex"
"io"
"testing"
)
func TestMapWithBkts(t *testing.T) {
bkts := make([]*Entry, 3, 3)
_, err := NewWithBkts(bkts)
if err == nil {
t.Fatalf("Buckets size of %d should have failed\n", len(bkts))
}
bkts = make([]*Entry, 8, 8)
_, err = NewWithBkts(bkts)
if err != nil {
t.Fatalf("Buckets size of %d should have succeeded\n", len(bkts))
}
}
var foo = []byte("foo")
var bar = []byte("bar")
var baz = []byte("baz")
var med = []byte("foo.bar.baz")
var sub = []byte("apcera.continuum.router.foo.bar.baz")
func TestHashMapBasics(t *testing.T) {
h := New()
if h.used != 0 {
t.Fatalf("Wrong number of entries: %d vs 0\n", h.used)
}
h.Set(foo, bar)
if h.used != 1 {
t.Fatalf("Wrong number of entries: %d vs 1\n", h.used)
}
if v := h.Get(foo).([]byte); !bytes.Equal(v, bar) {
t.Fatalf("Did not receive correct answer: '%s' vs '%s'\n", bar, v)
}
h.Remove(foo)
if h.used != 0 {
t.Fatalf("Wrong number of entries: %d vs 0\n", h.used)
}
if v := h.Get(foo); v != nil {
t.Fatal("Did not receive correct answer, should be nil")
}
}
const (
INS = 100
EXP = 128
REM = 75
EXP2 = 64
)
func TestGrowing(t *testing.T) {
h := New()
if len(h.bkts) != _BSZ {
t.Fatalf("Initial bucket size is wrong: %d vs %d\n", len(h.bkts), _BSZ)
}
// Create _INBOX style end tokens
var toks [INS][]byte
for i, _ := range toks {
u := make([]byte, 13)
io.ReadFull(rand.Reader, u)
toks[i] = []byte(hex.EncodeToString(u))
h.Set(toks[i], toks[i])
tg := h.Get(toks[i]).([]byte)
if !bytes.Equal(tg, toks[i]) {
t.Fatalf("Did not match properly, '%s' vs '%s'\n", tg, toks[i])
}
}
if len(h.bkts) != EXP {
t.Fatalf("Expanded bucket size is wrong: %d vs %d\n", len(h.bkts), EXP)
}
}
func TestHashMapCollisions(t *testing.T) {
h := New()
h.rsz = false
// Create _INBOX style end tokens
var toks [INS][]byte
for i, _ := range toks {
u := make([]byte, 13)
io.ReadFull(rand.Reader, u)
toks[i] = []byte(hex.EncodeToString(u))
h.Set(toks[i], toks[i])
tg := h.Get(toks[i]).([]byte)
if !bytes.Equal(tg, toks[i]) {
t.Fatalf("Did not match properly, '%s' vs '%s'\n", tg, toks[i])
}
}
if len(h.bkts) != _BSZ {
t.Fatalf("Bucket size is wrong: %d vs %d\n", len(h.bkts), _BSZ)
}
h.grow()
if len(h.bkts) != 2*_BSZ {
t.Fatalf("Bucket size is wrong: %d vs %d\n", len(h.bkts), 2*_BSZ)
}
ti := 32
tg := h.Get(toks[ti]).([]byte)
if !bytes.Equal(tg, toks[ti]) {
t.Fatalf("Did not match properly, '%s' vs '%s'\n", tg, toks[ti])
}
h.Remove(toks[99])
rg := h.Get(toks[99])
if rg != nil {
t.Fatalf("After remove should have been nil! '%s'\n", rg.([]byte))
}
}
func TestAll(t *testing.T) {
h := New()
h.Set([]byte("1"), 1)
h.Set([]byte("2"), 1)
h.Set([]byte("3"), 1)
all := h.All()
if len(all) != 3 {
t.Fatalf("Expected All() to return 3, but got %d\n", len(all))
}
allkeys := h.AllKeys()
if len(allkeys) != 3 {
t.Fatalf("Expected All() to return 3, but got %d\n", len(allkeys))
}
}
func TestSetDoesReplaceOnExisting(t *testing.T) {
h := New()
k := []byte("key")
h.Set(k, "foo")
h.Set(k, "bar")
all := h.All()
if len(all) != 1 {
t.Fatalf("Set should replace, expected 1 vs %d\n", len(all))
}
s, ok := all[0].(string)
if !ok {
t.Fatalf("Value is incorrect: %v\n", all[0].(string))
}
if s != "bar" {
t.Fatalf("Value is incorrect, expected 'bar' vs '%s'\n", s)
}
}
func TestCollision(t *testing.T) {
h := New()
k1 := []byte("999")
k2 := []byte("1000")
h.Set(k1, "foo")
h.Set(k2, "bar")
all := h.All()
if len(all) != 2 {
t.Fatalf("Expected 2 vs %d\n", len(all))
}
if h.Get(k1) == nil {
t.Fatalf("Failed to get '999'\n")
}
}
func TestHashMapStats(t *testing.T) {
h := New()
h.rsz = false
// Create _INBOX style end tokens
var toks [INS][]byte
for i, _ := range toks {
u := make([]byte, 13)
io.ReadFull(rand.Reader, u)
toks[i] = []byte(hex.EncodeToString(u))
h.Set(toks[i], toks[i])
tg := h.Get(toks[i]).([]byte)
if !bytes.Equal(tg, toks[i]) {
t.Fatalf("Did not match properly, '%s' vs '%s'\n", tg, toks[i])
}
}
s := h.Stats()
if s.NumElements != INS {
t.Fatalf("NumElements incorrect: %d vs %d\n", s.NumElements, INS)
}
if s.NumBuckets != _BSZ {
t.Fatalf("NumBuckets incorrect: %d vs %d\n", s.NumBuckets, _BSZ)
}
if s.AvgChain > 13 || s.AvgChain < 12 {
t.Fatalf("AvgChain out of bounds: %f vs %f\n", s.AvgChain, 12.5)
}
if s.LongChain > 25 {
t.Fatalf("LongChain out of bounds: %d vs %d\n", s.LongChain, 22)
}
}
func TestShrink(t *testing.T) {
h := New()
if len(h.bkts) != _BSZ {
t.Fatalf("Initial bucket size is wrong: %d vs %d\n", len(h.bkts), _BSZ)
}
// Create _INBOX style end tokens
var toks [INS][]byte
for i, _ := range toks {
u := make([]byte, 13)
io.ReadFull(rand.Reader, u)
toks[i] = []byte(hex.EncodeToString(u))
h.Set(toks[i], toks[i])
tg := h.Get(toks[i]).([]byte)
if !bytes.Equal(tg, toks[i]) {
t.Fatalf("Did not match properly, '%s' vs '%s'\n", tg, toks[i])
}
}
if len(h.bkts) != EXP {
t.Fatalf("Expanded bucket size is wrong: %d vs %d\n", len(h.bkts), EXP)
}
for i := 0; i < REM; i++ {
h.Remove(toks[i])
}
if len(h.bkts) != EXP2 {
t.Fatalf("Shrunk bucket size is wrong: %d vs %d\n", len(h.bkts), EXP2)
}
}
func TestFalseLookup(t *testing.T) {
h := New()
// DW + W
h.Set([]byte("cache.test.0"), "foo")
v := h.Get([]byte("cache.test.1"))
if v != nil {
t.Fatalf("Had a match when did not expect one!\n")
}
// DW + W + 3
h.Set([]byte("cache.test.1234"), "foo")
v = h.Get([]byte("cache.test.0000"))
if v != nil {
t.Fatalf("Had a match when did not expect one!\n")
}
}
func TestRemoveRandom(t *testing.T) {
h := New()
h.RemoveRandom()
h.Set(foo, "1")
h.Set(bar, "1")
h.Set(baz, "1")
if h.Count() != 3 {
t.Fatalf("Expected 3 members, got %d\n", h.Count())
}
h.RemoveRandom()
if h.Count() != 2 {
t.Fatalf("Expected 2 members, got %d\n", h.Count())
}
}
func Benchmark_GoMap___GetSmallKey(b *testing.B) {
b.StopTimer()
b.SetBytes(1)
m := make(map[string][]byte)
m["foo"] = bar
b.StartTimer()
for i := 0; i < b.N; i++ {
_ = m["foo"]
}
}
func Benchmark_HashMap_GetSmallKey(b *testing.B) {
b.StopTimer()
b.SetBytes(1)
m := New()
m.Set(foo, bar)
b.StartTimer()
for i := 0; i < b.N; i++ {
_ = m.Get(foo)
}
}
func Benchmark_GoMap____GetMedKey(b *testing.B) {
b.StopTimer()
b.SetBytes(1)
ts := string(med)
m := make(map[string][]byte)
m[ts] = bar
b.StartTimer()
for i := 0; i < b.N; i++ {
_ = m[ts]
}
}
func Benchmark_HashMap__GetMedKey(b *testing.B) {
b.StopTimer()
b.SetBytes(1)
m := New()
m.Set(sub, bar)
b.StartTimer()
for i := 0; i < b.N; i++ {
_ = m.Get(med)
}
}
func Benchmark_GoMap____GetLrgKey(b *testing.B) {
b.StopTimer()
b.SetBytes(1)
ts := string(sub)
m := make(map[string][]byte)
m[ts] = bar
b.StartTimer()
for i := 0; i < b.N; i++ {
_ = m[ts]
}
}
func Benchmark_HashMap__GetLrgKey(b *testing.B) {
b.StopTimer()
b.SetBytes(1)
m := New()
m.Set(sub, bar)
b.StartTimer()
for i := 0; i < b.N; i++ {
_ = m.Get(sub)
}
}
func Benchmark_HashMap_______Set(b *testing.B) {
b.StopTimer()
b.SetBytes(1)
m := New()
b.StartTimer()
for i := 0; i < b.N; i++ {
m.Set(foo, bar)
}
}