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memory.go
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memory.go
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// Copyright 2015, Yahoo Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package data
import (
// "log"
// "reflect"
"strings"
"sync/atomic"
)
// MemoryStore is an implementation for memory based data store.
type MemoryStore struct {
heap map[string]interface{}
}
// Set stores the key value pair.
func (m *MemoryStore) Set(key string, value interface{}) bool {
switch value.(type) {
case int, int8, int16, int32, int64, uint, uint8, uint16, uint32, uint64:
s, _ := convertIntToPtr(value)
m.heap[key] = s
default:
m.heap[key] = value
}
return true
}
// Get retrieve the value pointed by the key.
func (m *MemoryStore) Get(key string) (value interface{}, ok bool) {
value, ok = m.heap[key]
switch value.(type) {
case *int, *int8, *int16, *int32, *int64, *uint, *uint8, *uint16, *uint32, *uint64:
s, ok := convertPtrToInt(value)
return s, ok
default:
return value, ok
}
return value, ok
}
// IncrBy increments the value pointed by key with the delta, and return the new value.
func (m *MemoryStore) IncrBy(key string, delta int64) (newVal int64) {
newVal = atomic.AddInt64(m.heap[key].(*int64), delta)
return
}
func (m *MemoryStore) DelPrefix(prefix string) {
for k, _ := range m.heap {
if strings.HasPrefix(k, prefix) {
delete(m.heap, k)
}
}
}
// Dummy method
func (m *MemoryStore) Publish(k string, d interface{}) {
}
// NewMemoryStore creates the new store.
func NewMemoryStore() *MemoryStore {
m := MemoryStore{
heap: make(map[string]interface{}),
}
return &m
}
func convertIntToPtr(v interface{}) (s *int64, ok bool) {
var t int64
switch v.(type) {
case int:
t = int64(v.(int))
case int8:
t = int64(v.(int8))
case int16:
t = int64(v.(int16))
case int32:
t = int64(v.(int32))
case int64:
t = int64(v.(int64))
case uint:
t = int64(v.(uint))
case uint8:
t = int64(v.(uint8))
case uint16:
t = int64(v.(uint16))
case uint32:
t = int64(v.(uint32))
case uint64:
t = int64(v.(uint64))
}
return &t, ok
}
func convertPtrToInt(v interface{}) (s int64, ok bool) {
switch v.(type) {
case *int:
return int64(*(v.(*int))), true
case *int8:
return int64(*(v.(*int8))), true
case *int16:
return int64(*(v.(*int16))), true
case *int32:
return int64(*(v.(*int32))), true
case *int64:
return int64(*(v.(*int64))), true
case *uint:
return int64(*(v.(*uint))), true
case *uint8:
return int64(*(v.(*uint8))), true
case *uint16:
return int64(*(v.(*uint16))), true
case *uint32:
return int64(*(v.(*uint32))), true
case *uint64:
return int64(*(v.(*uint64))), true
}
return
}