mirror of
https://github.com/go-gitea/gitea
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980dd0bf51
* update xorm and dependencies vendor for feature to dump to other database * fix golint
295 lines
7.3 KiB
Go
295 lines
7.3 KiB
Go
// Copyright 2015 The Xorm Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package xorm
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import (
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"container/list"
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"fmt"
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"sync"
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"time"
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"github.com/go-xorm/core"
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)
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// LRUCacher implments cache object facilities
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type LRUCacher struct {
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idList *list.List
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sqlList *list.List
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idIndex map[string]map[string]*list.Element
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sqlIndex map[string]map[string]*list.Element
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store core.CacheStore
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mutex sync.Mutex
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// maxSize int
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MaxElementSize int
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Expired time.Duration
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GcInterval time.Duration
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}
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// NewLRUCacher creates a cacher
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func NewLRUCacher(store core.CacheStore, maxElementSize int) *LRUCacher {
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return NewLRUCacher2(store, 3600*time.Second, maxElementSize)
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}
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// NewLRUCacher2 creates a cache include different params
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func NewLRUCacher2(store core.CacheStore, expired time.Duration, maxElementSize int) *LRUCacher {
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cacher := &LRUCacher{store: store, idList: list.New(),
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sqlList: list.New(), Expired: expired,
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GcInterval: core.CacheGcInterval, MaxElementSize: maxElementSize,
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sqlIndex: make(map[string]map[string]*list.Element),
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idIndex: make(map[string]map[string]*list.Element),
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}
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cacher.RunGC()
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return cacher
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}
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// RunGC run once every m.GcInterval
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func (m *LRUCacher) RunGC() {
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time.AfterFunc(m.GcInterval, func() {
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m.RunGC()
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m.GC()
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})
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}
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// GC check ids lit and sql list to remove all element expired
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func (m *LRUCacher) GC() {
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//fmt.Println("begin gc ...")
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//defer fmt.Println("end gc ...")
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m.mutex.Lock()
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defer m.mutex.Unlock()
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var removedNum int
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for e := m.idList.Front(); e != nil; {
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if removedNum <= core.CacheGcMaxRemoved &&
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time.Now().Sub(e.Value.(*idNode).lastVisit) > m.Expired {
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removedNum++
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next := e.Next()
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//fmt.Println("removing ...", e.Value)
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node := e.Value.(*idNode)
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m.delBean(node.tbName, node.id)
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e = next
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} else {
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//fmt.Printf("removing %d cache nodes ..., left %d\n", removedNum, m.idList.Len())
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break
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}
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}
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removedNum = 0
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for e := m.sqlList.Front(); e != nil; {
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if removedNum <= core.CacheGcMaxRemoved &&
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time.Now().Sub(e.Value.(*sqlNode).lastVisit) > m.Expired {
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removedNum++
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next := e.Next()
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//fmt.Println("removing ...", e.Value)
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node := e.Value.(*sqlNode)
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m.delIds(node.tbName, node.sql)
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e = next
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} else {
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//fmt.Printf("removing %d cache nodes ..., left %d\n", removedNum, m.sqlList.Len())
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break
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}
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}
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}
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// GetIds returns all bean's ids according to sql and parameter from cache
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func (m *LRUCacher) GetIds(tableName, sql string) interface{} {
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m.mutex.Lock()
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defer m.mutex.Unlock()
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if _, ok := m.sqlIndex[tableName]; !ok {
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m.sqlIndex[tableName] = make(map[string]*list.Element)
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}
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if v, err := m.store.Get(sql); err == nil {
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if el, ok := m.sqlIndex[tableName][sql]; !ok {
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el = m.sqlList.PushBack(newSQLNode(tableName, sql))
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m.sqlIndex[tableName][sql] = el
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} else {
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lastTime := el.Value.(*sqlNode).lastVisit
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// if expired, remove the node and return nil
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if time.Now().Sub(lastTime) > m.Expired {
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m.delIds(tableName, sql)
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return nil
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}
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m.sqlList.MoveToBack(el)
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el.Value.(*sqlNode).lastVisit = time.Now()
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}
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return v
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}
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m.delIds(tableName, sql)
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return nil
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}
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// GetBean returns bean according tableName and id from cache
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func (m *LRUCacher) GetBean(tableName string, id string) interface{} {
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m.mutex.Lock()
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defer m.mutex.Unlock()
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if _, ok := m.idIndex[tableName]; !ok {
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m.idIndex[tableName] = make(map[string]*list.Element)
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}
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tid := genID(tableName, id)
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if v, err := m.store.Get(tid); err == nil {
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if el, ok := m.idIndex[tableName][id]; ok {
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lastTime := el.Value.(*idNode).lastVisit
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// if expired, remove the node and return nil
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if time.Now().Sub(lastTime) > m.Expired {
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m.delBean(tableName, id)
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//m.clearIds(tableName)
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return nil
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}
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m.idList.MoveToBack(el)
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el.Value.(*idNode).lastVisit = time.Now()
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} else {
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el = m.idList.PushBack(newIDNode(tableName, id))
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m.idIndex[tableName][id] = el
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}
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return v
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}
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// store bean is not exist, then remove memory's index
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m.delBean(tableName, id)
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//m.clearIds(tableName)
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return nil
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}
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// clearIds clears all sql-ids mapping on table tableName from cache
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func (m *LRUCacher) clearIds(tableName string) {
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if tis, ok := m.sqlIndex[tableName]; ok {
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for sql, v := range tis {
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m.sqlList.Remove(v)
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m.store.Del(sql)
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}
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}
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m.sqlIndex[tableName] = make(map[string]*list.Element)
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}
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// ClearIds clears all sql-ids mapping on table tableName from cache
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func (m *LRUCacher) ClearIds(tableName string) {
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m.mutex.Lock()
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defer m.mutex.Unlock()
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m.clearIds(tableName)
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}
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func (m *LRUCacher) clearBeans(tableName string) {
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if tis, ok := m.idIndex[tableName]; ok {
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for id, v := range tis {
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m.idList.Remove(v)
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tid := genID(tableName, id)
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m.store.Del(tid)
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}
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}
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m.idIndex[tableName] = make(map[string]*list.Element)
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}
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// ClearBeans clears all beans in some table
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func (m *LRUCacher) ClearBeans(tableName string) {
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m.mutex.Lock()
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defer m.mutex.Unlock()
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m.clearBeans(tableName)
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}
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// PutIds pus ids into table
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func (m *LRUCacher) PutIds(tableName, sql string, ids interface{}) {
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m.mutex.Lock()
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defer m.mutex.Unlock()
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if _, ok := m.sqlIndex[tableName]; !ok {
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m.sqlIndex[tableName] = make(map[string]*list.Element)
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}
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if el, ok := m.sqlIndex[tableName][sql]; !ok {
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el = m.sqlList.PushBack(newSQLNode(tableName, sql))
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m.sqlIndex[tableName][sql] = el
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} else {
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el.Value.(*sqlNode).lastVisit = time.Now()
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}
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m.store.Put(sql, ids)
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if m.sqlList.Len() > m.MaxElementSize {
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e := m.sqlList.Front()
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node := e.Value.(*sqlNode)
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m.delIds(node.tbName, node.sql)
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}
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}
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// PutBean puts beans into table
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func (m *LRUCacher) PutBean(tableName string, id string, obj interface{}) {
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m.mutex.Lock()
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defer m.mutex.Unlock()
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var el *list.Element
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var ok bool
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if el, ok = m.idIndex[tableName][id]; !ok {
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el = m.idList.PushBack(newIDNode(tableName, id))
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m.idIndex[tableName][id] = el
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} else {
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el.Value.(*idNode).lastVisit = time.Now()
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}
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m.store.Put(genID(tableName, id), obj)
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if m.idList.Len() > m.MaxElementSize {
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e := m.idList.Front()
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node := e.Value.(*idNode)
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m.delBean(node.tbName, node.id)
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}
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}
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func (m *LRUCacher) delIds(tableName, sql string) {
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if _, ok := m.sqlIndex[tableName]; ok {
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if el, ok := m.sqlIndex[tableName][sql]; ok {
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delete(m.sqlIndex[tableName], sql)
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m.sqlList.Remove(el)
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}
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}
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m.store.Del(sql)
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}
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// DelIds deletes ids
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func (m *LRUCacher) DelIds(tableName, sql string) {
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m.mutex.Lock()
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defer m.mutex.Unlock()
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m.delIds(tableName, sql)
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}
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func (m *LRUCacher) delBean(tableName string, id string) {
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tid := genID(tableName, id)
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if el, ok := m.idIndex[tableName][id]; ok {
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delete(m.idIndex[tableName], id)
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m.idList.Remove(el)
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m.clearIds(tableName)
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}
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m.store.Del(tid)
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}
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// DelBean deletes beans in some table
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func (m *LRUCacher) DelBean(tableName string, id string) {
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m.mutex.Lock()
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defer m.mutex.Unlock()
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m.delBean(tableName, id)
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}
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type idNode struct {
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tbName string
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id string
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lastVisit time.Time
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}
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type sqlNode struct {
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tbName string
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sql string
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lastVisit time.Time
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}
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func genSQLKey(sql string, args interface{}) string {
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return fmt.Sprintf("%v-%v", sql, args)
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}
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func genID(prefix string, id string) string {
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return fmt.Sprintf("%v-%v", prefix, id)
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}
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func newIDNode(tbName string, id string) *idNode {
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return &idNode{tbName, id, time.Now()}
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}
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func newSQLNode(tbName, sql string) *sqlNode {
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return &sqlNode{tbName, sql, time.Now()}
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}
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