mirror of https://github.com/tidwall/tile38.git
477 lines
9.2 KiB
Go
477 lines
9.2 KiB
Go
package ds
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import (
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"fmt"
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"math/rand"
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"strings"
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"testing"
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"time"
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)
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func init() {
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seed := time.Now().UnixNano()
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fmt.Printf("seed: %d\n", seed)
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rand.Seed(seed)
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}
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func randKeys(N int) (keys []string) {
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format := fmt.Sprintf("%%0%dd", len(fmt.Sprintf("%d", N-1)))
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for _, i := range rand.Perm(N) {
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keys = append(keys, fmt.Sprintf(format, i))
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}
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return
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}
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const flatLeaf = true
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func (tr *BTree) print() {
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tr.root.print(0, tr.height)
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}
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func (n *node) print(level, height int) {
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if n == nil {
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println("NIL")
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return
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}
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if height == 0 && flatLeaf {
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fmt.Printf("%s", strings.Repeat(" ", level))
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}
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for i := 0; i < n.numItems; i++ {
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if height > 0 {
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n.children[i].print(level+1, height-1)
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}
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if height > 0 || (height == 0 && !flatLeaf) {
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fmt.Printf("%s%v\n", strings.Repeat(" ", level), n.items[i].key)
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} else {
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if i > 0 {
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fmt.Printf(",")
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}
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fmt.Printf("%s", n.items[i].key)
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}
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}
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if height == 0 && flatLeaf {
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fmt.Printf("\n")
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}
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if height > 0 {
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n.children[n.numItems].print(level+1, height-1)
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}
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}
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func (tr *BTree) deepPrint() {
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fmt.Printf("%#v\n", tr)
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tr.root.deepPrint(0, tr.height)
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}
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func (n *node) deepPrint(level, height int) {
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if n == nil {
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fmt.Printf("%s %#v\n", strings.Repeat(" ", level), n)
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return
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}
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fmt.Printf("%s count: %v\n", strings.Repeat(" ", level), n.numItems)
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fmt.Printf("%s items: %v\n", strings.Repeat(" ", level), n.items)
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if height > 0 {
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fmt.Printf("%s child: %v\n", strings.Repeat(" ", level), n.children)
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}
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if height > 0 {
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for i := 0; i < n.numItems; i++ {
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n.children[i].deepPrint(level+1, height-1)
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}
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n.children[n.numItems].deepPrint(level+1, height-1)
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}
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}
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func stringsEquals(a, b []string) bool {
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if len(a) != len(b) {
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return false
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}
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for i := 0; i < len(a); i++ {
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if a[i] != b[i] {
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return false
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}
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}
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return true
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}
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func TestDescend(t *testing.T) {
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var tr BTree
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var count int
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tr.Descend("1", func(key string, value interface{}) bool {
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count++
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return true
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})
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if count > 0 {
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t.Fatalf("expected 0, got %v", count)
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}
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var keys []string
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for i := 0; i < 1000; i += 10 {
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keys = append(keys, fmt.Sprintf("%03d", i))
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tr.Set(keys[len(keys)-1], nil)
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}
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var exp []string
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tr.Reverse(func(key string, _ interface{}) bool {
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exp = append(exp, key)
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return true
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})
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for i := 999; i >= 0; i-- {
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var key string
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key = fmt.Sprintf("%03d", i)
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var all []string
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tr.Descend(key, func(key string, value interface{}) bool {
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all = append(all, key)
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return true
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})
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for len(exp) > 0 && key < exp[0] {
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exp = exp[1:]
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}
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var count int
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tr.Descend(key, func(key string, value interface{}) bool {
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if count == (i+1)%maxItems {
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return false
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}
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count++
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return true
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})
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if count > len(exp) {
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t.Fatalf("expected 1, got %v", count)
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}
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if !stringsEquals(exp, all) {
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fmt.Printf("exp: %v\n", exp)
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fmt.Printf("all: %v\n", all)
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t.Fatal("mismatch")
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}
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}
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}
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func TestAscend(t *testing.T) {
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var tr BTree
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var count int
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tr.Ascend("1", func(key string, value interface{}) bool {
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count++
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return true
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})
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if count > 0 {
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t.Fatalf("expected 0, got %v", count)
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}
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var keys []string
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for i := 0; i < 1000; i += 10 {
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keys = append(keys, fmt.Sprintf("%03d", i))
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tr.Set(keys[len(keys)-1], nil)
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}
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exp := keys
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for i := -1; i < 1000; i++ {
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var key string
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if i == -1 {
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key = ""
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} else {
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key = fmt.Sprintf("%03d", i)
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}
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var all []string
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tr.Ascend(key, func(key string, value interface{}) bool {
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all = append(all, key)
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return true
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})
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for len(exp) > 0 && key > exp[0] {
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exp = exp[1:]
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}
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var count int
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tr.Ascend(key, func(key string, value interface{}) bool {
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if count == (i+1)%maxItems {
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return false
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}
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count++
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return true
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})
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if count > len(exp) {
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t.Fatalf("expected 1, got %v", count)
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}
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if !stringsEquals(exp, all) {
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t.Fatal("mismatch")
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}
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}
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}
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func TestBTree(t *testing.T) {
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N := 10000
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var tr BTree
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keys := randKeys(N)
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// insert all items
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for _, key := range keys {
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value, replaced := tr.Set(key, key)
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if replaced {
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t.Fatal("expected false")
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}
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if value != nil {
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t.Fatal("expected nil")
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}
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}
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// check length
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if tr.Len() != len(keys) {
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t.Fatalf("expected %v, got %v", len(keys), tr.Len())
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}
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// get each value
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for _, key := range keys {
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value, gotten := tr.Get(key)
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if !gotten {
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t.Fatal("expected true")
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}
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if value == nil || value.(string) != key {
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t.Fatalf("expected '%v', got '%v'", key, value)
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}
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}
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// scan all items
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var last string
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all := make(map[string]interface{})
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tr.Scan(func(key string, value interface{}) bool {
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if key <= last {
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t.Fatal("out of order")
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}
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if value.(string) != key {
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t.Fatalf("mismatch")
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}
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last = key
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all[key] = value
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return true
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})
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if len(all) != len(keys) {
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t.Fatalf("expected '%v', got '%v'", len(keys), len(all))
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}
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// reverse all items
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var prev string
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all = make(map[string]interface{})
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tr.Reverse(func(key string, value interface{}) bool {
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if prev != "" && key >= prev {
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t.Fatal("out of order")
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}
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if value.(string) != key {
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t.Fatalf("mismatch")
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}
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prev = key
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all[key] = value
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return true
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})
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if len(all) != len(keys) {
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t.Fatalf("expected '%v', got '%v'", len(keys), len(all))
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}
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// try to get an invalid item
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value, gotten := tr.Get("invalid")
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if gotten {
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t.Fatal("expected false")
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}
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if value != nil {
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t.Fatal("expected nil")
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}
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// scan and quit at various steps
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for i := 0; i < 100; i++ {
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var j int
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tr.Scan(func(key string, value interface{}) bool {
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if j == i {
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return false
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}
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j++
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return true
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})
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}
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// reverse and quit at various steps
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for i := 0; i < 100; i++ {
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var j int
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tr.Reverse(func(key string, value interface{}) bool {
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if j == i {
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return false
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}
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j++
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return true
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})
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}
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// delete half the items
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for _, key := range keys[:len(keys)/2] {
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value, deleted := tr.Delete(key)
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if !deleted {
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t.Fatal("expected true")
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}
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if value == nil || value.(string) != key {
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t.Fatalf("expected '%v', got '%v'", key, value)
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}
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}
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// check length
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if tr.Len() != len(keys)/2 {
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t.Fatalf("expected %v, got %v", len(keys)/2, tr.Len())
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}
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// try delete half again
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for _, key := range keys[:len(keys)/2] {
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value, deleted := tr.Delete(key)
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if deleted {
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t.Fatal("expected false")
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}
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if value != nil {
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t.Fatalf("expected nil")
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}
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}
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// try delete half again
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for _, key := range keys[:len(keys)/2] {
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value, deleted := tr.Delete(key)
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if deleted {
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t.Fatal("expected false")
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}
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if value != nil {
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t.Fatalf("expected nil")
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}
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}
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// check length
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if tr.Len() != len(keys)/2 {
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t.Fatalf("expected %v, got %v", len(keys)/2, tr.Len())
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}
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// scan items
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last = ""
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all = make(map[string]interface{})
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tr.Scan(func(key string, value interface{}) bool {
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if key <= last {
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t.Fatal("out of order")
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}
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if value.(string) != key {
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t.Fatalf("mismatch")
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}
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last = key
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all[key] = value
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return true
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})
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if len(all) != len(keys)/2 {
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t.Fatalf("expected '%v', got '%v'", len(keys), len(all))
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}
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// replace second half
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for _, key := range keys[len(keys)/2:] {
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value, replaced := tr.Set(key, key)
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if !replaced {
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t.Fatal("expected true")
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}
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if value == nil || value.(string) != key {
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t.Fatalf("expected '%v', got '%v'", key, value)
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}
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}
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// delete next half the items
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for _, key := range keys[len(keys)/2:] {
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value, deleted := tr.Delete(key)
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if !deleted {
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t.Fatal("expected true")
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}
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if value == nil || value.(string) != key {
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t.Fatalf("expected '%v', got '%v'", key, value)
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}
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}
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// check length
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if tr.Len() != 0 {
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t.Fatalf("expected %v, got %v", 0, tr.Len())
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}
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// do some stuff on an empty tree
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value, gotten = tr.Get(keys[0])
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if gotten {
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t.Fatal("expected false")
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}
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if value != nil {
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t.Fatal("expected nil")
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}
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tr.Scan(func(key string, value interface{}) bool {
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t.Fatal("should not be reached")
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return true
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})
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tr.Reverse(func(key string, value interface{}) bool {
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t.Fatal("should not be reached")
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return true
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})
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var deleted bool
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value, deleted = tr.Delete("invalid")
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if deleted {
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t.Fatal("expected false")
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}
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if value != nil {
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t.Fatal("expected nil")
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}
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}
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func BenchmarkTidwallSet(b *testing.B) {
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var tr BTree
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keys := randKeys(b.N)
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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tr.Set(keys[i], nil)
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}
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}
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func BenchmarkTidwallGet(b *testing.B) {
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var tr BTree
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keys := randKeys(b.N)
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for i := 0; i < b.N; i++ {
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tr.Set(keys[i], nil)
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}
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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tr.Get(keys[i])
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}
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}
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func TestBTreeOne(t *testing.T) {
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var tr BTree
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tr.Set("1", "1")
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tr.Delete("1")
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tr.Set("1", "1")
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tr.Delete("1")
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tr.Set("1", "1")
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tr.Delete("1")
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}
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func TestBTree256(t *testing.T) {
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var tr BTree
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var n int
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for j := 0; j < 2; j++ {
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for _, i := range rand.Perm(256) {
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tr.Set(fmt.Sprintf("%d", i), i)
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n++
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if tr.Len() != n {
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t.Fatalf("expected 256, got %d", n)
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}
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}
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for _, i := range rand.Perm(256) {
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v, ok := tr.Get(fmt.Sprintf("%d", i))
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if !ok {
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t.Fatal("expected true")
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}
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if v.(int) != i {
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t.Fatalf("expected %d, got %d", i, v.(int))
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}
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}
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for _, i := range rand.Perm(256) {
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tr.Delete(fmt.Sprintf("%d", i))
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n--
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if tr.Len() != n {
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t.Fatalf("expected 256, got %d", n)
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}
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}
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for _, i := range rand.Perm(256) {
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_, ok := tr.Get(fmt.Sprintf("%d", i))
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if ok {
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t.Fatal("expected false")
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}
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}
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}
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}
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