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watch.go
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watch.go
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package gzkwrapper
import "github.com/samuel/go-zookeeper/zk"
import (
"errors"
"time"
)
const RetryInterval time.Duration = time.Second * 5
type WatchObject struct {
Path string
exit chan bool
}
func CreateWatchObject(path string, conn *zk.Conn, callback WatchHandlerFunc) *WatchObject {
if conn == nil {
return nil
}
watchobject := &WatchObject{
Path: path,
exit: make(chan bool),
}
go func(wo *WatchObject, c *zk.Conn, fn WatchHandlerFunc) {
listen := true
for listen {
ret, _, ev, err := c.ExistsW(wo.Path)
if err != nil {
if callback != nil {
callback(wo.Path, nil, err)
}
time.Sleep(RetryInterval)
continue
}
select {
case <-ev:
{
if ret {
go func() {
data, _, err := c.Get(wo.Path)
if callback != nil {
callback(wo.Path, data, err)
}
}()
} else {
if callback != nil {
callback(wo.Path, nil, errors.New("watch exists not found."))
}
time.Sleep(RetryInterval)
}
}
case <-wo.exit:
{
listen = false
}
}
}
}(watchobject, conn, callback)
return watchobject
}
/*
func CreateWatchObject(path string, conn *zk.Conn, callback WatchHandlerFunc) *WatchObject {
if conn == nil {
return nil
}
watchobject := &WatchObject{
Path: path,
exit: make(chan bool),
}
go func(wo *WatchObject, c *zk.Conn, fn WatchHandlerFunc) {
listen := true
NEW_WATCH:
for listen {
ret, _, ev, err := c.ExistsW(wo.Path)
if err != nil {
if callback != nil {
callback(wo.Path, nil, err)
}
time.Sleep(RetryInterval)
goto NEW_WATCH
}
select {
case <-ev:
{
if ret {
data, _, err := c.Get(wo.Path)
if err != nil {
if callback != nil {
callback(wo.Path, nil, err)
}
time.Sleep(RetryInterval)
goto NEW_WATCH
}
if callback != nil {
callback(wo.Path, data, nil)
}
} else {
if callback != nil {
callback(wo.Path, nil, errors.New("watch exists not found."))
}
time.Sleep(RetryInterval)
goto NEW_WATCH
}
}
case <-wo.exit:
{
listen = false
}
}
}
}(watchobject, conn, callback)
return watchobject
}
*/
func ReleaseWatchObject(wo *WatchObject) {
if wo != nil {
wo.exit <- true
close(wo.exit)
}
}