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mapcachestorage.go
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mapcachestorage.go
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package main
import (
"strconv"
"sync"
"time"
)
type MapCacheStorage struct {
storageMap map[string]*StorageEntry
rwLock sync.RWMutex
}
func newMapCacheStorage() *MapCacheStorage {
storage := &MapCacheStorage{}
storage.Init()
return storage
}
func (self *MapCacheStorage) Init() {
self.storageMap = make(map[string]*StorageEntry)
}
func (self *StorageEntry) expired() bool {
if self.exptime == 0 {
return false
}
now := uint32(time.Seconds())
return self.exptime <= now
}
func (self *MapCacheStorage) Set(key string, flags uint32, exptime uint32, bytes uint32, content []byte) (previous *StorageEntry, result *StorageEntry) {
self.rwLock.Lock()
defer self.rwLock.Unlock()
entry, present := self.storageMap[key]
var newEntry *StorageEntry
if present && !entry.expired() {
newEntry = &StorageEntry{exptime, flags, bytes, entry.cas_unique + 1, content}
self.storageMap[key] = newEntry
return entry, newEntry
}
newEntry = &StorageEntry{exptime, flags, bytes, 0, content}
self.storageMap[key] = newEntry
return nil, newEntry
}
func (self *MapCacheStorage) Add(key string, flags uint32, exptime uint32, bytes uint32, content []byte) (err ErrorCode, result *StorageEntry) {
self.rwLock.Lock()
defer self.rwLock.Unlock()
entry, present := self.storageMap[key]
if present && !entry.expired() {
return KeyAlreadyInUse, nil
}
entry = &StorageEntry{exptime, flags, bytes, 0, content}
self.storageMap[key] = entry
return Ok, entry
}
func (self *MapCacheStorage) Replace(key string, flags uint32, exptime uint32, bytes uint32, content []byte) (ErrorCode, *StorageEntry, *StorageEntry) {
self.rwLock.Lock()
defer self.rwLock.Unlock()
entry, present := self.storageMap[key]
if present && !entry.expired() {
newEntry := &StorageEntry{exptime, flags, bytes, entry.cas_unique + 1, content}
self.storageMap[key] = newEntry
return Ok, entry, newEntry
}
return KeyNotFound, nil, nil
}
func (self *MapCacheStorage) Append(key string, bytes uint32, content []byte) (ErrorCode, *StorageEntry, *StorageEntry) {
self.rwLock.Lock()
defer self.rwLock.Unlock()
entry, present := self.storageMap[key]
if present && !entry.expired() {
newContent := make([]byte, len(entry.content)+len(content))
copy(newContent, entry.content)
copy(newContent[len(entry.content):], content)
newEntry := &StorageEntry{entry.exptime, entry.flags, bytes + entry.bytes, entry.cas_unique + 1, newContent}
self.storageMap[key] = newEntry
return Ok, entry, newEntry
}
return KeyNotFound, nil, nil
}
func (self *MapCacheStorage) Prepend(key string, bytes uint32, content []byte) (ErrorCode, *StorageEntry, *StorageEntry) {
self.rwLock.Lock()
defer self.rwLock.Unlock()
entry, present := self.storageMap[key]
if present && !entry.expired() {
newContent := make([]byte, len(entry.content)+len(content))
copy(newContent, content)
copy(newContent[len(content):], entry.content)
newEntry := &StorageEntry{entry.exptime, entry.flags, bytes + entry.bytes,
entry.cas_unique + 1, newContent}
self.storageMap[key] = newEntry
return Ok, entry, newEntry
}
return KeyNotFound, nil, nil
}
func (self *MapCacheStorage) Cas(key string, flags uint32, exptime uint32, bytes uint32, cas_unique uint64, content []byte) (ErrorCode, *StorageEntry, *StorageEntry) {
self.rwLock.Lock()
defer self.rwLock.Unlock()
entry, present := self.storageMap[key]
if present && !entry.expired() {
if entry.cas_unique == cas_unique {
newEntry := &StorageEntry{exptime, flags, bytes, cas_unique, content}
self.storageMap[key] = newEntry
return Ok, entry, newEntry
} else {
return IllegalParameter, entry, nil
}
}
return KeyNotFound, nil, nil
}
func (self *MapCacheStorage) Get(key string) (ErrorCode, *StorageEntry) {
self.rwLock.RLock()
defer self.rwLock.RUnlock()
entry, present := self.storageMap[key]
if present && !entry.expired() {
return Ok, entry
}
return KeyNotFound, nil
}
func (self *MapCacheStorage) Delete(key string) (ErrorCode, *StorageEntry) {
self.rwLock.Lock()
defer self.rwLock.Unlock()
entry, present := self.storageMap[key]
if present && !entry.expired() {
self.storageMap[key] = nil, false
return Ok, entry
}
return KeyNotFound, nil
}
func (self *MapCacheStorage) Incr(key string, value uint64, incr bool) (ErrorCode, *StorageEntry, *StorageEntry) {
self.rwLock.Lock()
defer self.rwLock.Unlock()
entry, present := self.storageMap[key]
if present && !entry.expired() {
if addValue, err := strconv.Atoui64(string(entry.content)); err == nil {
var incrValue uint64
if incr {
incrValue = uint64(addValue) + value
} else if value > addValue {
incrValue = 0
} else {
incrValue = uint64(addValue) - value
}
incrStrValue := strconv.Uitoa64(incrValue)
old_value := entry.content
entry.content = []byte(incrStrValue)
entry.bytes = uint32(len(entry.content))
entry.cas_unique += 1
return Ok, &StorageEntry{entry.exptime, entry.flags, entry.bytes, entry.cas_unique, old_value}, entry
} else {
return IllegalParameter, nil, nil
}
}
return KeyNotFound, nil, nil
}
/* keep a null object for map deletion */
var nullStorageEntry = &StorageEntry{}
func (self *MapCacheStorage) Expire(key string, check bool) {
self.rwLock.Lock()
defer self.rwLock.Unlock()
entry, present := self.storageMap[key]
if present && (!check || entry.expired()) {
self.storageMap[key] = nullStorageEntry, false
}
}