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cache.go
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cache.go
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// Copyright (c) 2022 The Go-Enjin Authors
//
// 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 pageql
import "sync"
var _cache *cache
func init() {
_cache = &cache{
queryData: make(map[string]*queryDataEntry),
selectData: make(map[string]*selectDataEntry),
}
}
type cache struct {
queryData map[string]*queryDataEntry
selectData map[string]*selectDataEntry
sync.RWMutex
}
type queryDataEntry struct {
Query string
Expr *Statement
}
func (c *cache) getQuery(query string) (stmnt *Statement, ok bool) {
c.RLock()
defer c.RUnlock()
var entry *queryDataEntry
if entry, ok = c.queryData[query]; ok {
stmnt = entry.Expr
return
}
return
}
func (c *cache) setQuery(query string, expr *Statement) {
c.Lock()
defer c.Unlock()
c.queryData[query] = &queryDataEntry{
Query: query,
Expr: expr,
}
return
}
func CompileQuery(query string) (stmnt *Statement, err *ParseError) {
err = nil
query = SanitizeQuery(query)
var ok bool
if stmnt, ok = _cache.getQuery(query); ok {
return
}
if stmnt, err = parseQueryString(query); err == nil {
_cache.setQuery(query, stmnt)
}
return
}
type selectDataEntry struct {
Query string
Sel *Selection
}
func (c *cache) getSelect(query string) (stmnt *Selection, ok bool) {
c.RLock()
defer c.RUnlock()
var entry *selectDataEntry
if entry, ok = c.selectData[query]; ok {
stmnt = entry.Sel
return
}
return
}
func (c *cache) setSelect(query string, sel *Selection) {
c.Lock()
defer c.Unlock()
c.selectData[query] = &selectDataEntry{
Query: query,
Sel: sel,
}
return
}
func CompileSelect(query string) (sel *Selection, err *ParseError) {
err = nil
query = SanitizeQuery(query)
var ok bool
if sel, ok = _cache.getSelect(query); ok {
return
}
if sel, err = parseSelectString(query); err == nil {
_cache.setSelect(query, sel)
}
return
}