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cache.go
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cache.go
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/*
* Copyright (C) 2016 Red Hat, Inc.
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 enhancers
import (
"sync"
"github.com/pmylund/go-cache"
)
const (
maxCacheUpdateTry = 10
)
type tidCacheEntry struct {
sync.RWMutex
tid string
try int
}
type tidCache struct {
*cache.Cache
}
func (c *tidCache) get(key string) (*tidCacheEntry, bool) {
if entry, f := c.Get(key); f {
ce := entry.(*tidCacheEntry)
ce.RLock()
defer ce.RUnlock()
if ce.tid != "" || ce.try > maxCacheUpdateTry {
return ce, f
}
return ce, false
}
return &tidCacheEntry{}, false
}
func (c *tidCache) set(ce *tidCacheEntry, key, tid string) {
ce.Lock()
ce.tid = tid
ce.try++
ce.Unlock()
c.Set(key, ce, cache.DefaultExpiration)
}
func (c *tidCache) del(key string) {
c.Delete(key)
}