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Levin Zimmermann
neoppod
Commits
2dad1860
Commit
2dad1860
authored
Feb 19, 2019
by
Kirill Smelkov
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parent
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go/zodb/open.go
go/zodb/open.go
+50
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go/zodb/open.go
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2dad1860
...
...
@@ -196,27 +196,56 @@ const (
// watcher dispatches events from driver to subscribers and serves
// {Add,Del}Watch requests.
func
(
s
*
storage
)
watcher
()
{
for
{
select
{
case
req
:=
<-
s
.
watchReq
:
switch
req
.
op
{
case
addWatch
:
s
.
watchTab
[
req
.
watchq
]
=
struct
{}{}
// staging place for AddWatch requests.
//
// during event delivery to registered watchqs, add/del requests are
// also served - not to get stuck and support clients who do DelWatch
// and no longer receive from their watchq. However we cannot register
// added watchq immediately, because it is undefined whether or not
// we'll see it while iterating watchTab. So we queue what was added
// and flush it on the beginning of each cycle.
var
addq
map
[
chan
<-
Event
]
struct
{}
addqFlush
:=
func
()
{
for
watchq
:=
range
addq
{
s
.
watchTab
[
watchq
]
=
struct
{}{}
}
addq
=
make
(
map
[
chan
<-
Event
]
struct
{})
}
handleReq
:=
func
(
req
watchRequest
)
{
switch
req
.
op
{
case
addWatch
:
addq
[
req
.
watchq
]
=
struct
{}{}
case
delWatch
:
delete
(
s
.
watchTab
,
req
.
watchq
)
case
delWatch
:
delete
(
s
.
watchTab
,
req
.
watchq
)
delete
(
addq
,
req
.
watchq
)
default
:
panic
(
"bad watch request op"
)
}
default
:
panic
(
"bad watch request op"
)
}
req
.
ack
<-
s
.
drvHead
req
.
ack
<-
s
.
drvHead
}
// close all subscribers's watchq on close
// XXX AddWatch/DelWatch after watcher exits?
defer
func
()
{
addqFlush
()
for
watchq
:=
range
s
.
watchTab
{
close
(
watchq
)
}
}()
for
{
addqFlush
()
// register staged AddWatch(s)
select
{
case
req
:=
<-
s
.
watchReq
:
handleReq
(
req
)
case
event
,
ok
:=
<-
s
.
drvWatchq
:
if
!
ok
{
// storage closed
// XXX close all subscribers' watchq?
// XXX AddWatch/DelWatch after watcher exits?
return
}
...
...
@@ -235,8 +264,13 @@ func (s *storage) watcher() {
// deliver event to all watchers
for
watchq
:=
range
s
.
watchTab
{
// XXX + select and handle DelWatch
watchq
<-
event
select
{
case
req
:=
<-
s
.
watchReq
:
handleReq
(
req
)
case
watchq
<-
event
:
// ok
}
}
}
}
...
...
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