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Move to container/list datastructure from map[string][]byte

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master
Harshavardhana 10 years ago
parent d11dfe003c
commit bab4a47525
4 changed files with 71 additions and 104 deletions
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  1. 154
      pkg/donut/cache/data/data.go
  2. 2
      pkg/donut/cache/data/data_test.go
  3. 17
      pkg/donut/donut-v2.go
  4. 2
      pkg/donut/multipart.go

154
pkg/donut/cache/data/data.go vendored
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@ -18,6 +18,7 @@
package data
import (
"container/list"
"sync"
"time"
)
@ -32,16 +33,10 @@ type Cache struct {
sync.Mutex
// items hold the cached objects
items map[string][]byte
items *list.List
// updatedAt holds the time that related item's updated at
updatedAt map[string]time.Time
// expiration is a duration for a cache key to expire
expiration time.Duration
// stopExpireTimer channel to quit the timer thread
stopExpireTimer chan struct{}
// reverseItems holds the time that related item's updated at
reverseItems map[string]*list.Element
// maxSize is a total size for overall cache
maxSize uint64
@ -49,30 +44,34 @@ type Cache struct {
// currentSize is a current size in memory
currentSize uint64
// OnExpired - callback function for eviction
OnExpired func(a ...interface{})
// OnEvicted - callback function for eviction
OnEvicted func(a ...interface{})
// totalExpired counter to keep track of total expirations
totalExpired uint64
// totalEvicted counter to keep track of total expirations
totalEvicted int
}
// Stats current cache statistics
type Stats struct {
Bytes uint64
Items uint64
Expired uint64
Items int
Evicted int
}
type element struct {
key string
value []byte
}
// NewCache creates an inmemory cache
//
// maxSize is used for expiring objects before we run out of memory
// expiration is used for expiration of a key from cache
func NewCache(maxSize uint64, expiration time.Duration) *Cache {
func NewCache(maxSize uint64) *Cache {
return &Cache{
items: make(map[string][]byte),
updatedAt: map[string]time.Time{},
expiration: expiration,
maxSize: maxSize,
items: list.New(),
reverseItems: make(map[string]*list.Element),
maxSize: maxSize,
}
}
@ -80,50 +79,32 @@ func NewCache(maxSize uint64, expiration time.Duration) *Cache {
func (r *Cache) Stats() Stats {
return Stats{
Bytes: r.currentSize,
Items: uint64(len(r.items)),
Expired: r.totalExpired,
Items: r.items.Len(),
Evicted: r.totalEvicted,
}
}
// ExpireObjects expire objects in go routine
func (r *Cache) ExpireObjects(gcInterval time.Duration) {
r.stopExpireTimer = make(chan struct{})
ticker := time.NewTicker(gcInterval)
go func() {
for {
select {
case <-ticker.C:
r.Expire()
case <-r.stopExpireTimer:
ticker.Stop()
return
}
}
}()
}
// Get returns a value of a given key if it exists
func (r *Cache) Get(key string) ([]byte, bool) {
r.Lock()
defer r.Unlock()
value, ok := r.items[key]
if !ok {
ele, hit := r.reverseItems[key]
if !hit {
return nil, false
}
r.updatedAt[key] = time.Now()
return value, true
r.items.MoveToFront(ele)
return ele.Value.(*element).value, true
}
// Len returns length of the value of a given key, returns zero if key doesn't exist
func (r *Cache) Len(key string) int {
r.Lock()
defer r.Unlock()
_, ok := r.items[key]
_, ok := r.reverseItems[key]
if !ok {
return 0
}
return len(r.items[key])
return len(r.reverseItems[key].Value.(*element).value)
}
// Append will append new data to an existing key,
@ -140,22 +121,20 @@ func (r *Cache) Append(key string, value []byte) bool {
}
// remove random key if only we reach the maxSize threshold
for (r.currentSize + valueLen) > r.maxSize {
for randomKey := range r.items {
r.doDelete(randomKey)
break
}
r.doDeleteOldest()
break
}
}
_, ok := r.items[key]
if !ok {
r.items[key] = value
ele, hit := r.reverseItems[key]
if !hit {
ele := r.items.PushFront(&element{key, value})
r.currentSize += valueLen
r.updatedAt[key] = time.Now()
r.reverseItems[key] = ele
return true
}
r.items[key] = append(r.items[key], value...)
r.items.MoveToFront(ele)
r.currentSize += valueLen
r.updatedAt[key] = time.Now()
ele.Value.(*element).value = append(ele.Value.(*element).value, value...)
return true
}
@ -172,55 +151,46 @@ func (r *Cache) Set(key string, value []byte) bool {
}
// remove random key if only we reach the maxSize threshold
for (r.currentSize + valueLen) > r.maxSize {
for randomKey := range r.items {
r.doDelete(randomKey)
break
}
r.doDeleteOldest()
}
}
r.items[key] = value
if _, hit := r.reverseItems[key]; hit {
return false
}
ele := r.items.PushFront(&element{key, value})
r.currentSize += valueLen
r.updatedAt[key] = time.Now()
r.reverseItems[key] = ele
return true
}
// Expire expires keys which have expired
func (r *Cache) Expire() {
r.Lock()
defer r.Unlock()
for key := range r.items {
if !r.isValid(key) {
r.doDelete(key)
}
}
}
// Delete deletes a given key if exists
func (r *Cache) Delete(key string) {
r.Lock()
defer r.Unlock()
r.doDelete(key)
}
func (r *Cache) doDelete(key string) {
if _, ok := r.items[key]; ok {
r.currentSize -= uint64(len(r.items[key]))
delete(r.items, key)
delete(r.updatedAt, key)
r.totalExpired++
if r.OnExpired != nil {
r.OnExpired(key)
ele, ok := r.reverseItems[key]
if !ok {
return
}
if ele != nil {
r.currentSize -= uint64(len(r.reverseItems[key].Value.(*element).value))
r.items.Remove(ele)
delete(r.reverseItems, key)
r.totalEvicted++
if r.OnEvicted != nil {
r.OnEvicted(key)
}
}
}
func (r *Cache) isValid(key string) bool {
updatedAt, ok := r.updatedAt[key]
if !ok {
return false
}
if r.expiration == noExpiration {
return true
func (r *Cache) doDeleteOldest() {
ele := r.items.Back()
if ele != nil {
r.currentSize -= uint64(len(r.reverseItems[ele.Value.(*element).key].Value.(*element).value))
delete(r.reverseItems, ele.Value.(*element).key)
r.items.Remove(ele)
r.totalEvicted++
if r.OnEvicted != nil {
r.OnEvicted(ele.Value.(*element).key)
}
}
return updatedAt.Add(r.expiration).After(time.Now())
}

2
pkg/donut/cache/data/data_test.go vendored
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@ -29,7 +29,7 @@ type MySuite struct{}
var _ = Suite(&MySuite{})
func (s *MySuite) TestCache(c *C) {
cache := NewCache(1000, 0)
cache := NewCache(1000)
data := []byte("Hello, world!")
ok := cache.Set("filename", data)

17
pkg/donut/donut-v2.go
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@ -80,15 +80,12 @@ func New(c *Config) (Interface, error) {
a.storedBuckets = metadata.NewCache()
a.nodes = make(map[string]node)
a.buckets = make(map[string]bucket)
a.objects = data.NewCache(a.config.MaxSize, a.config.Expiration)
a.multiPartObjects = data.NewCache(0, time.Duration(0))
a.objects.OnExpired = a.expiredObject
a.multiPartObjects.OnExpired = a.expiredPart
a.objects = data.NewCache(a.config.MaxSize)
a.multiPartObjects = data.NewCache(0)
a.objects.OnEvicted = a.evictedObject
a.multiPartObjects.OnEvicted = a.evictedPart
a.lock = new(sync.Mutex)
// set up cache expiration
a.objects.ExpireObjects(time.Second * 5)
if len(a.config.NodeDiskMap) > 0 {
for k, v := range a.config.NodeDiskMap {
if len(v) == 0 {
@ -570,10 +567,10 @@ func (donut API) GetObjectMetadata(bucket, key string) (ObjectMetadata, error) {
return ObjectMetadata{}, iodine.New(ObjectNotFound{Object: key}, nil)
}
func (donut API) expiredObject(a ...interface{}) {
func (donut API) evictedObject(a ...interface{}) {
cacheStats := donut.objects.Stats()
log.Printf("CurrentSize: %d, CurrentItems: %d, TotalExpirations: %d",
cacheStats.Bytes, cacheStats.Items, cacheStats.Expired)
log.Printf("CurrentSize: %d, CurrentItems: %d, TotalEvicted: %d",
cacheStats.Bytes, cacheStats.Items, cacheStats.Evicted)
key := a[0].(string)
// loop through all buckets
for _, bucket := range donut.storedBuckets.GetAll() {

2
pkg/donut/multipart.go
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@ -376,7 +376,7 @@ func (donut API) ListObjectParts(bucket, key string, resources ObjectResourcesMe
return objectResourcesMetadata, nil
}
func (donut API) expiredPart(a ...interface{}) {
func (donut API) evictedPart(a ...interface{}) {
key := a[0].(string)
// loop through all buckets
buckets := donut.storedBuckets.GetAll()

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