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/*
* 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.
*/
/*
* Content before git sha 34fdeebefcbf183ed7f916f931aa0586fdaa1b40
* Copyright (c) 2016, The Gocql authors,
* provided under the BSD-3-Clause License.
* See the NOTICE file distributed with this work for additional information.
*/
package gocql
import (
"bytes"
"sync"
"github.com/gocql/gocql/internal/lru"
)
const defaultMaxPreparedStmts = 1000
// preparedLRU is the prepared statement cache
type preparedLRU struct {
mu sync.Mutex
lru *lru.Cache
}
func (p *preparedLRU) clear() {
p.mu.Lock()
defer p.mu.Unlock()
for p.lru.Len() > 0 {
p.lru.RemoveOldest()
}
}
func (p *preparedLRU) add(key string, val *inflightPrepare) {
p.mu.Lock()
defer p.mu.Unlock()
p.lru.Add(key, val)
}
func (p *preparedLRU) remove(key string) bool {
p.mu.Lock()
defer p.mu.Unlock()
return p.lru.Remove(key)
}
func (p *preparedLRU) execIfMissing(key string, fn func(lru *lru.Cache) *inflightPrepare) (*inflightPrepare, bool) {
p.mu.Lock()
defer p.mu.Unlock()
val, ok := p.lru.Get(key)
if ok {
return val.(*inflightPrepare), true
}
return fn(p.lru), false
}
func (p *preparedLRU) keyFor(hostID, keyspace, statement string) string {
// TODO: we should just use a struct for the key in the map
return hostID + keyspace + statement
}
func (p *preparedLRU) evictPreparedID(key string, id []byte) {
p.mu.Lock()
defer p.mu.Unlock()
val, ok := p.lru.Get(key)
if !ok {
return
}
ifp, ok := val.(*inflightPrepare)
if !ok {
return
}
select {
case <-ifp.done:
if bytes.Equal(id, ifp.preparedStatment.id) {
p.lru.Remove(key)
}
default:
}
}
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