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|
package streams
import (
"math"
"strconv"
"sync/atomic"
"testing"
)
func TestUsesAllStreams(t *testing.T) {
streams := New(1)
got := make(map[int]struct{})
for i := 1; i < streams.NumStreams; i++ {
stream, ok := streams.GetStream()
if !ok {
t.Fatalf("unable to get stream %d", i)
}
if _, ok = got[stream]; ok {
t.Fatalf("got an already allocated stream: %d", stream)
}
got[stream] = struct{}{}
if !streams.isSet(stream) {
bucket := atomic.LoadUint64(&streams.streams[bucketOffset(stream)])
t.Logf("bucket=%d: %s\n", bucket, strconv.FormatUint(bucket, 2))
t.Fatalf("stream not set: %d", stream)
}
}
for i := 1; i < streams.NumStreams; i++ {
if _, ok := got[i]; !ok {
t.Errorf("did not use stream %d", i)
}
}
if _, ok := got[0]; ok {
t.Fatal("expected to not use stream 0")
}
for i, bucket := range streams.streams {
if bucket != math.MaxUint64 {
t.Errorf("did not use all streams in offset=%d bucket=%s", i, bitfmt(bucket))
}
}
}
func TestFullStreams(t *testing.T) {
streams := New(1)
for i := range streams.streams {
streams.streams[i] = math.MaxUint64
}
stream, ok := streams.GetStream()
if ok {
t.Fatalf("should not get stream when all in use: stream=%d", stream)
}
}
func TestClearStreams(t *testing.T) {
streams := New(1)
for i := range streams.streams {
streams.streams[i] = math.MaxUint64
}
streams.inuseStreams = int32(streams.NumStreams)
for i := 0; i < streams.NumStreams; i++ {
streams.Clear(i)
}
for i, bucket := range streams.streams {
if bucket != 0 {
t.Errorf("did not clear streams in offset=%d bucket=%s", i, bitfmt(bucket))
}
}
}
func TestDoubleClear(t *testing.T) {
streams := New(1)
stream, ok := streams.GetStream()
if !ok {
t.Fatal("did not get stream")
}
if !streams.Clear(stream) {
t.Fatalf("stream not indicated as in use: %d", stream)
}
if streams.Clear(stream) {
t.Fatalf("stream not as in use after clear: %d", stream)
}
}
func BenchmarkConcurrentUse(b *testing.B) {
streams := New(2)
b.RunParallel(func(pb *testing.PB) {
for pb.Next() {
stream, ok := streams.GetStream()
if !ok {
b.Error("unable to get stream")
return
}
if !streams.Clear(stream) {
b.Errorf("stream was already cleared: %d", stream)
return
}
}
})
}
func TestStreamOffset(t *testing.T) {
tests := [...]struct {
n int
off uint64
}{
{0, 63},
{1, 62},
{2, 61},
{3, 60},
{63, 0},
{64, 63},
{128, 63},
}
for _, test := range tests {
if off := streamOffset(test.n); off != test.off {
t.Errorf("n=%d expected %d got %d", test.n, off, test.off)
}
}
}
func TestIsSet(t *testing.T) {
tests := [...]struct {
stream int
bucket uint64
set bool
}{
{0, 0, false},
{0, 1 << 63, true},
{1, 0, false},
{1, 1 << 62, true},
{63, 1, true},
{64, 1 << 63, true},
{0, 0x8000000000000000, true},
}
for i, test := range tests {
if set := isSet(test.bucket, test.stream); set != test.set {
t.Errorf("[%d] stream=%d expected %v got %v", i, test.stream, test.set, set)
}
}
for i := 0; i < bucketBits; i++ {
if !isSet(math.MaxUint64, i) {
var shift uint64 = math.MaxUint64 >> streamOffset(i)
t.Errorf("expected isSet for all i=%d got=%d", i, shift)
}
}
}
func TestBucketOfset(t *testing.T) {
tests := [...]struct {
n int
bucket int
}{
{0, 0},
{1, 0},
{63, 0},
{64, 1},
}
for _, test := range tests {
if bucket := bucketOffset(test.n); bucket != test.bucket {
t.Errorf("n=%d expected %v got %v", test.n, test.bucket, bucket)
}
}
}
func TestStreamFromBucket(t *testing.T) {
tests := [...]struct {
bucket int
pos int
stream int
}{
{0, 0, 0},
{0, 1, 1},
{0, 2, 2},
{0, 63, 63},
{1, 0, 64},
{1, 1, 65},
}
for _, test := range tests {
if stream := streamFromBucket(test.bucket, test.pos); stream != test.stream {
t.Errorf("bucket=%d pos=%d expected %v got %v", test.bucket, test.pos, test.stream, stream)
}
}
}
|
