golang线程安全map
import (
"sync"
)
// SyncMap is a map with lock
type SyncMap struct {
lock *sync.RWMutex
bm map[interface{}]interface{}
}
// NewSyncMap return new safemap
func NewSyncMap() *SyncMap {
return &SyncMap{
lock: new(sync.RWMutex),
bm: make(map[interface{}]interface{}),
}
}
// Get from maps return the k's value
func (m *SyncMap) 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 *SyncMap) 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 *SyncMap) 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 *SyncMap) Delete(k interface{}) {
m.lock.Lock()
defer m.lock.Unlock()
delete(m.bm, k)
}
// Items returns all items in safemap.
func (m *SyncMap) 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 *SyncMap) Count() int {
m.lock.RLock()
defer m.lock.RUnlock()
return len(m.bm)
}