bee/vendor/github.com/astaxie/beego/utils/safemap.go

92 lines
2.0 KiB
Go

// Copyright 2014 beego Author. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package utils
import (
"sync"
)
// BeeMap is a map with lock
type BeeMap struct {
lock *sync.RWMutex
bm map[interface{}]interface{}
}
// NewBeeMap return new safemap
func NewBeeMap() *BeeMap {
return &BeeMap{
lock: new(sync.RWMutex),
bm: make(map[interface{}]interface{}),
}
}
// Get from maps return the k's value
func (m *BeeMap) Get(k interface{}) interface{} {
m.lock.RLock()
defer m.lock.RUnlock()
if val, ok := m.bm[k]; ok {
return val
}
return nil
}
// Set Maps the given key and value. Returns false
// if the key is already in the map and changes nothing.
func (m *BeeMap) Set(k interface{}, v interface{}) bool {
m.lock.Lock()
defer m.lock.Unlock()
if val, ok := m.bm[k]; !ok {
m.bm[k] = v
} else if val != v {
m.bm[k] = v
} else {
return false
}
return true
}
// Check Returns true if k is exist in the map.
func (m *BeeMap) Check(k interface{}) bool {
m.lock.RLock()
defer m.lock.RUnlock()
_, ok := m.bm[k]
return ok
}
// Delete the given key and value.
func (m *BeeMap) Delete(k interface{}) {
m.lock.Lock()
defer m.lock.Unlock()
delete(m.bm, k)
}
// Items returns all items in safemap.
func (m *BeeMap) Items() map[interface{}]interface{} {
m.lock.RLock()
defer m.lock.RUnlock()
r := make(map[interface{}]interface{})
for k, v := range m.bm {
r[k] = v
}
return r
}
// Count returns the number of items within the map.
func (m *BeeMap) Count() int {
m.lock.RLock()
defer m.lock.RUnlock()
return len(m.bm)
}