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storage: add watch ID to identify watchings

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One watcher includes multiple watchings, and their events are
sent out through one channel. For the received event, user would like to
know which watching it belongs to.

Introduce a watch ID. When watching on some key, user will get a watch
ID. The watch ID is attached to all events that is observed by this
watch.
This commit is contained in:
Yicheng Qin
2015-11-20 10:50:53 -08:00
parent 2de9a5bbd0
commit deb1da5f57
8 changed files with 125 additions and 16 deletions
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2
storage/watchable_store_test.go
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@ -49,7 +49,7 @@ func TestNewWatcherCancel(t *testing.T) {
s.Put(testKey, testValue)
w := s.NewWatcher()
cancel := w.Watch(testKey, true, 0)
_, cancel := w.Watch(testKey, true, 0)
cancel()