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deb1da5f57
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.
65 lines
1.6 KiB
Go
65 lines
1.6 KiB
Go
// Copyright 2015 CoreOS, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package storage
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import "testing"
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// TestWatcherWatchID tests that each watcher provides unique watch ID,
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// and the watched event attaches the correct watch ID.
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func TestWatcherWatchID(t *testing.T) {
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s := WatchableKV(newWatchableStore(tmpPath))
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defer cleanup(s, tmpPath)
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w := s.NewWatcher()
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defer w.Close()
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idm := make(map[int64]struct{})
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// synced watchings
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for i := 0; i < 10; i++ {
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id, cancel := w.Watch([]byte("foo"), false, 0)
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if _, ok := idm[id]; ok {
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t.Errorf("#%d: id %d exists", i, id)
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}
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idm[id] = struct{}{}
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s.Put([]byte("foo"), []byte("bar"))
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ev := <-w.Chan()
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if ev.WatchID != id {
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t.Errorf("#%d: watch id in event = %d, want %d", i, ev.WatchID, id)
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}
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cancel()
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}
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s.Put([]byte("foo2"), []byte("bar"))
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// unsynced watchings
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for i := 10; i < 20; i++ {
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id, cancel := w.Watch([]byte("foo2"), false, 1)
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if _, ok := idm[id]; ok {
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t.Errorf("#%d: id %d exists", i, id)
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}
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idm[id] = struct{}{}
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ev := <-w.Chan()
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if ev.WatchID != id {
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t.Errorf("#%d: watch id in event = %d, want %d", i, ev.WatchID, id)
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}
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cancel()
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}
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}
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