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bucket.go
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bucket.go
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package cmap
import (
"bytes"
"sync"
"sync/atomic"
)
type Bucket interface {
Put(p Pair, lock sync.Locker) (bool, error)
Get(key string) Pair
GetFirstPair() Pair
Delete(key string, lock sync.Locker) bool
Clear(lock sync.Locker)
Size() uint64
String() string
}
type bucket struct {
firstValue atomic.Value
size uint64
}
var placeholder = &pair{}
func newBucket() Bucket {
b := &bucket{}
b.firstValue.Store(placeholder)
return b
}
func (b *bucket) Put(p Pair, lock sync.Locker) (bool, error) {
if p == nil {
return false, newIllegalParameterError("pair is nil")
}
if lock != nil {
lock.Lock()
defer lock.Unlock()
}
first := b.GetFirstPair()
if first == nil {
b.firstValue.Store(p)
atomic.AddUint64(&b.size, 1)
return true, nil
}
var target Pair
key := p.Key()
for v := first; v != nil; v=v.Next() {
if v.Key() == key {
target = v
break
}
}
if target != nil {
target.SetElement(p.Element())
}
p.SetNext(first)
b.firstValue.Store(p)
atomic.AddUint64(&b.size, 1)
return true, nil
}
func (b *bucket) Get(key string) Pair {
firstPair := b.GetFirstPair()
if firstPair == nil {
return nil
}
for v := firstPair; v != nil ; v = v.Next() {
if v.Key() == key {
return v
}
}
return nil
}
func (b *bucket) GetFirstPair() Pair {
if v := b.firstValue.Load(); v == nil {
return nil
} else if p, ok := v.(Pair); !ok || p == placeholder{
return nil
} else {
return p
}
}
func (b *bucket) Delete(key string, lock sync.Locker) bool {
if lock != nil {
lock.Lock()
defer lock.Unlock()
}
firstPair := b.GetFirstPair()
if firstPair == nil {
return false
}
var prePair []Pair
var target, breakPoint Pair
for v := firstPair; v != nil; v = v.Next() {
if v.Key() == key {
target = v
breakPoint = v.Next()
break
}
prePair = append(prePair, v)
}
if target == nil {
return false
}
newFirstPair := breakPoint
for i := len(prePair)-1; i >= 0; i-- {
tmp := prePair[i].Copy()
tmp.SetNext(newFirstPair)
newFirstPair = tmp
}
if newFirstPair != nil {
b.firstValue.Store(newFirstPair)
} else {
b.firstValue.Store(placeholder)
}
atomic.AddUint64(&b.size, ^uint64(0))
return true
}
func (b *bucket) Clear(lock sync.Locker) {
if lock != nil {
lock.Lock()
defer lock.Unlock()
}
atomic.StoreUint64(&b.size, 0)
b.firstValue.Store(placeholder)
}
func (b *bucket) Size() uint64 {
return atomic.LoadUint64(&b.size)
}
func (b *bucket) String() string {
var buf bytes.Buffer
buf.WriteString("[")
// pair
for v := b.GetFirstPair(); v != nil; v = v.Next() {
buf.WriteString(v.String() + " ")
}
buf.WriteString("]")
return buf.String()
}