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generate.go
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generate.go
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package cmap
import "strings"
func GenerateTypeSyncMap(Model string, args map[string]string) string {
args["${Model}"] = Model
initArgs(args)
format := `
package ${package_name}
import (
"encoding/json"
"fmt"
"math"
"sync"
"sync/atomic"
"time"
)
// Auto-generate by github.com/fwhezfwhez/cmap.GenerateTypeSyncMap()
// Note:
// You might put this auto-genereted file to the package where ${Model}{} is defined.
// How to use this auto-generate concurrently-safe ${Model}Map?
/*
var ${model} ${Model}
m := New${Model}Map()
m.Set(fmt.Sprintf("%d", ${model}.${Model}Id), ${model})
_ = m.Get(fmt.Sprintf("%d", ${model}.${Model}Id))
m.Delete(fmt.Sprintf("%d", ${model}.${Model}Id))
m.SetEx(fmt.Sprintf("%d", ${model}.${Model}Id), ${model}, 3*24*60*60)
*/
// And you can supervisor it by:
/*
go func(){
for {
m.ClearExpireKeys()
time.Sleep(24 * time.Hour)
}
}()
*/
// value saved
type ${Model}Value struct {
// value
v ${Model}
// value will be expired in exp seconds, -1 means no time limit
exp int64
// Map's offset, when map exec set/delete, offset++
offset int64
// generated time when a value is set, unixnano
execAt int64
}
// v is latter than v2 in time
// LatterThan helps judge set/del/sync make sense or not
func (v ${Model}Value) LatterThan(v2 ${Model}Value) bool {
if v.execAt > v2.execAt {
return true
}
if v.execAt < v2.execAt {
return false
}
return v.offset > v2.offset
}
// v is former than v2 in time
func (v ${Model}Value) FormerThan(v2 ${Model}Value) bool {
if v.execAt < v2.execAt {
return true
}
if v.execAt > v2.execAt {
return false
}
return v.offset < v2.offset
}
// make value readable
func (v ${Model}Value) detail() map[string]interface{} {
m := map[string]interface{}{
"v": v.v,
"exp": v.exp,
"offset": v.offset,
"exec_at": v.execAt,
}
return m
}
// M_FREE and M_BUSY are signal of map.m state.
// When map.mode == M_FREE, data are writable and readable using map.m.
// When map.mode == M_BUSY, data are writable and readble using map.dirty, writable map.write and writable map.del
const (
${MODEL}_M_FREE = 0
${MODEL}_M_BUSY = 1
)
// Map is concurrently safe, and faster than sync.Map.
// Map consist of m, dirty, write, del, these 4 data register.
// In M_FREE mode, map.m is writable/readable to users.
// When calling map.ClearExpireKeys(), map will change mode into M_BUSY.
// In B_BUSY mode, map.m is unreadable and unwritable. users read data from dirty.
// At this moment,
// writing operation will write data to map.dirty, map.write
// deleting operation will write to map.del
// As soon as clearing job done, mode set to M_FREE,
// At this moment,
// map.m is return to job, writed and read
// map.write change to read-only and data in m.write will be sync to map.m then cleared
// map.del change to read-only and data in m.del will sync to map.m then cleared
// map.dirty are first be cleared and then synchronizing data from map.m and block new write request, after sync job done, finish all writing request.
type ${Model}Map struct {
mode int
l *sync.RWMutex
m map[string]${Model}Value
dl *sync.RWMutex
dirty map[string]${Model}Value
wl *sync.RWMutex
write map[string]${Model}Value
dll *sync.RWMutex
offset int64
del map[string]${Model}Value
}
// Help viewing map's detail.
// b, e:= json.MarshalIndent(m.Detail(), "", " ")
// fmt.Println(string(b))
type ${model}MapView struct {
Mode int
M map[string]interface{}
Dirty map[string]interface{}
Write map[string]interface{}
Offset int64
Del map[string]interface{}
}
func new${Model}Map() *${Model}Map {
return &${Model}Map{
mode: ${MODEL}_M_FREE,
l: &sync.RWMutex{},
m: make(map[string]${Model}Value),
dl: &sync.RWMutex{},
dirty: make(map[string]${Model}Value),
wl: &sync.RWMutex{},
write: make(map[string]${Model}Value),
dll: &sync.RWMutex{},
del: make(map[string]${Model}Value),
}
}
// new a concurrent map
func New${Model}Map() *${Model}Map {
return new${Model}Map()
}
// Pause the world
// gLock and gUnlock must run in pair
func (m *${Model}Map) gLock() {
m.l.Lock()
m.wl.Lock()
m.dl.Lock()
m.dll.Lock()
}
// Continue
func (m *${Model}Map) gUnlock() {
m.l.Unlock()
m.wl.Unlock()
m.dl.Unlock()
m.dll.Unlock()
}
func (m *${Model}Map) gRLock() {
m.l.RLock()
m.wl.RLock()
m.dl.RLock()
m.dll.RLock()
}
func (m *${Model}Map) gRUnlock() {
m.dll.RUnlock()
m.dl.RUnlock()
m.wl.RUnlock()
m.l.RUnlock()
}
func (m *${Model}Map) IsBusy() bool {
m.gRLock()
defer m.gRUnlock()
return m.mode == ${MODEL}_M_BUSY
}
// map.Set
func (m *${Model}Map) Set(key string, value ${Model}) {
ext := time.Now().UnixNano()
offset := m.offsetIncr()
// only when not busy, m is writable
if !m.IsBusy() {
m.l.Lock()
m.m[key] = ${Model}Value{
v: value,
exp: -1,
execAt: ext,
offset: offset,
}
m.l.Unlock()
}
m.dl.Lock()
m.dirty[key] = ${Model}Value{
v: value,
exp: -1,
execAt: ext,
offset: offset,
}
m.dl.Unlock()
// only when m is busy, write map is writable
if m.IsBusy() {
m.wl.Lock()
m.write[key] = ${Model}Value{
v: value,
exp: -1,
execAt: ext,
offset: offset,
}
m.wl.Unlock()
}
}
// set,del,setnx,setex will increase map.offset.
// When offset reaches max int64 value, will be back to 0
// So to judege values former or latter, should compare v.execAt first and then comapre offset.
func (m *${Model}Map) offsetIncr() int64 {
atomic.CompareAndSwapInt64(&m.offset, math.MaxInt64, 0)
atomic.AddInt64(&m.offset, 1)
return m.offset
}
// map.SetEX
// key-value will be put with expired time limit.
// If seconds are set -1, value will not be expired
// expired keys will be deleted as soon as calling m.Get(key), or calling m.ClearExpireKeys()
func (m *${Model}Map) SetEx(key string, value ${Model}, seconds int) {
ext := time.Now().UnixNano()
offset := m.offsetIncr()
// only when not busy, m is writable
if !m.IsBusy() {
m.l.Lock()
m.m[key] = ${Model}Value{
v: value,
exp: time.Now().Add(time.Duration(seconds) * time.Second).UnixNano(),
execAt: ext,
offset: offset,
}
m.l.Unlock()
}
m.dl.Lock()
m.dirty[key] = ${Model}Value{
v: value,
exp: time.Now().Add(time.Duration(seconds) * time.Second).UnixNano(),
execAt: ext,
offset: offset,
}
m.dl.Unlock()
// only when m is busy, write map is writable
if m.IsBusy() {
m.wl.Lock()
m.write[key] = ${Model}Value{
v: value,
exp: time.Now().Add(time.Duration(seconds) * time.Second).UnixNano(),
execAt: ext,
offset: offset,
}
m.wl.Unlock()
}
}
// map.SetNx
// If key exist, do nothing, otherwise set key,value into map
func (m *${Model}Map) SetNx(key string, value ${Model}) {
m.SetExNx(key, value, -1)
}
// map.SetEXNX
// If key exist, do nothing, otherwise set key,value into map
func (m *${Model}Map) SetExNx(key string, value ${Model}, seconds int) {
if m.IsBusy() {
m.dl.RLock()
_, exist := m.dirty[key]
m.dl.RUnlock()
if exist {
return
} else {
m.SetEx(key, value, seconds)
return
}
} else {
m.l.RLock()
_, exist := m.m[key]
m.l.RUnlock()
if exist {
return
} else {
m.SetEx(key, value, seconds)
return
}
}
}
// If key is expired or not existed, return nil
func (m *${Model}Map) Get(key string) ${Model} {
if !m.IsBusy() {
return ${model}GetFrom(m.l, m.m, key)
} else {
return ${model}GetFrom(m.dl, m.dirty, key)
}
}
// Delete
func (m *${Model}Map) Delete(key string) {
offset := m.offsetIncr()
ext := time.Now().UnixNano()
if !m.IsBusy() {
m.l.RLock()
_, ok := m.m[key]
m.l.RUnlock()
if ok {
m.l.Lock()
delete(m.m, key)
m.l.Unlock()
}
}
m.dl.RLock()
_, ok2 := m.dirty[key]
m.dl.RUnlock()
if ok2 {
m.dl.Lock()
delete(m.dirty, key)
m.dl.Unlock()
}
if m.IsBusy() {
m.dll.Lock()
m.del[key] = ${Model}Value{
exp: 0,
v: ${Model}{},
execAt: ext,
offset: offset,
}
m.dll.Unlock()
}
}
func (m *${Model}Map) Detail() ${model}MapView {
var listMaxNum = 10
var flag = 0
mv := ${model}MapView{
M: make(map[string]interface{}),
Dirty: make(map[string]interface{}),
Del: make(map[string]interface{}),
Write: make(map[string]interface{}),
}
mv.Offset = m.offset
m.l.RLock()
for k, _ := range m.m {
flag++
mv.M[k] = m.m[k].detail()
if flag > listMaxNum {
mv.M["reach-max-detail"] = ${Model}{}
break
}
}
m.l.RUnlock()
m.dl.RLock()
flag = 0
for k, _ := range m.dirty {
mv.Dirty[k] = m.dirty[k].detail()
flag++
if flag > listMaxNum {
mv.Dirty["reach-max-detail"] = ${Model}{}
break
}
}
m.dl.RUnlock()
m.wl.RLock()
flag = 0
for k, _ := range m.write {
mv.Write[k] = m.write[k].detail()
flag++
if flag > listMaxNum {
mv.Write["reach-max-detail"] =${Model}{}
break
}
}
m.wl.RUnlock()
flag = 0
m.dll.RLock()
for k, _ := range m.del {
mv.Del[k] = m.del[k].detail()
flag++
if flag > listMaxNum {
mv.Del["reach-max-detail"] = ${Model}{}
break
}
}
m.dll.RUnlock()
return mv
}
func (m *${Model}Map) PrintDetail() string {
b, e := json.MarshalIndent(m.Detail(), "", " ")
if e != nil {
fmt.Println(e.Error())
return ""
}
fmt.Println(string(b))
return string(b)
}
func ${model}GetFrom(l *sync.RWMutex, m map[string]${Model}Value, key string) ${Model} {
l.RLock()
value, ok := m[key]
l.RUnlock()
if !ok {
return ${Model}{}
}
if value.exp == -1 {
return value.v
}
if time.Now().UnixNano() >= value.exp {
l.Lock()
delete(m, key)
l.Unlock()
return ${Model}{}
}
return value.v
}
func (m *${Model}Map) setBusy() {
m.gLock()
m.mode = ${MODEL}_M_BUSY
m.gUnlock()
}
func (m *${Model}Map) setFree() {
m.gLock()
m.mode = ${MODEL}_M_FREE
m.gUnlock()
}
// Returns Map.m real length, not m.dirty or m.write.
func (m *${Model}Map) Len() int {
m.l.RLock()
length := len(m.m)
m.l.RUnlock()
return length
}
// ClearExpireKeys clear expired keys, and it will not influence map write and read.
// When call m.ClearExpireKeys(), first will set m.mode=M_BUSY.
// At this moment, operation of write to Map.m is denied and instead data will be writen to Map.write which will sync to Map.m after clear job done.
// operation of read will use Map.dirty.
// After clear job has been done, Map.dirty will be cleared and copy from Map.m, Map.write will be unwritenable and data in Map.write will sync to Map.m.
func (m *${Model}Map) ClearExpireKeys() int {
if m.IsBusy() {
// on clearing job, another clear job do nothing
return 0
}
// clear Map.m expired keys
n := m.clearExpireKeys()
m.l.Lock()
m.wl.RLock()
for k, v := range m.write {
v2, ok := m.m[k]
if !ok {
m.m[k] = v
} else {
if v2.LatterThan(v) {
continue
}
}
}
m.wl.RUnlock()
m.wl.Lock()
m.write = make(map[string]${Model}Value)
m.wl.Unlock()
m.l.Unlock()
// sync deleted operation from Map.del
m.l.Lock()
m.dll.Lock()
for k, v := range m.del {
v2, ok := m.m[k]
if !ok {
continue
}
if v.LatterThan(v2) {
delete(m.m, k)
}
}
m.del = make(map[string]${Model}Value)
m.dll.Unlock()
m.l.Unlock()
// When migrating data from m to drity, since while tmp is coping from m.m, m.m and m.dirty are still writable, tmp is relatively old.
// So make sure data from old m.m's copied tmp will not influence latest writened data in dirty.
m.l.RLock()
m.dl.Lock()
m.dirty = make(map[string]${Model}Value)
for k, v := range m.m {
v2, ok := m.dirty[k]
if ok && v2.LatterThan(v) {
// make sure existed latest writen data will not be replaced by the old
continue
} else {
// replace old data
m.dirty[k] = v
}
}
m.dl.Unlock()
m.l.RUnlock()
return n
}
// Change to busy mode, now dirty provides read, write provides write, del provides delete.
// After clear expired keys in m, m will change into free auto..ly.
// in free mode, m.del and m.write will not provides read nor write, m.dirty will not read.
func (m *${Model}Map) clearExpireKeys() int {
m.setBusy()
defer m.setFree()
var num int
var shouldDelete = make([]string, 0, len(m.m))
m.l.RLock()
for k, v := range m.m {
if v.exp == -1 {
continue
}
if v.exp < time.Now().UnixNano() {
shouldDelete = append(shouldDelete, k)
}
}
m.l.RUnlock()
m.l.Lock()
for _, v := range shouldDelete {
num++
delete(m.m, v)
}
m.l.Unlock()
return num
}
`
return replace(format, args)
}
func initArgs(args map[string]string) {
if len(args) == 0 {
args = map[string]string{}
}
if args["${package_name}"] == "" {
args["${package_name}"] = "model"
}
if args["${Model}"] == "" {
args["${Model}"] = "Model"
}
if args["${MODEL}"] == "" {
args["${MODEL}"] = strings.ToUpper(args["${Model}"])
}
if args["${model}"] == "" {
args["${model}"] = strings.ToLower(args["${Model}"])
}
}
func replace(format string, args map[string]string) string {
var rs = format
// rs = strings.Replace(format, "${package_name}", "model", -1)
for k, v := range args {
rs = strings.Replace(rs, k, v, -1)
}
return rs
}