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// Copyright 2021 The casbin Authors. 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 cache
import (
"sync"
"time"
)
type SyncCache struct {
cache DefaultCache
sync.RWMutex
}
func (c *SyncCache) Set(key string, value bool, extra ...interface{}) error {
ttl := time.Duration(-1)
if len(extra) > 0 {
ttl = extra[0].(time.Duration)
}
c.Lock()
defer c.Unlock()
c.cache[key] = cacheItem{
value: value,
expiresAt: time.Now().Add(ttl),
ttl: ttl,
}
return nil
}
func (c *SyncCache) Get(key string) (bool, error) {
c.RLock()
res, ok := c.cache[key]
c.RUnlock()
if !ok {
return false, ErrNoSuchKey
} else {
if res.ttl > 0 && time.Now().After(res.expiresAt) {
c.Lock()
defer c.Unlock()
delete(c.cache, key)
return false, ErrNoSuchKey
}
return res.value, nil
}
}
func (c *SyncCache) Delete(key string) error {
c.RLock()
_, ok := c.cache[key]
c.RUnlock()
if !ok {
return ErrNoSuchKey
} else {
c.Lock()
defer c.Unlock()
delete(c.cache, key)
return nil
}
}
func (c *SyncCache) Clear() error {
c.Lock()
c.cache = make(DefaultCache)
c.Unlock()
return nil
}
func NewSyncCache() (Cache, error) {
cache := SyncCache{
make(DefaultCache),
sync.RWMutex{},
}
return &cache, nil
}
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