49 lines
1.8 KiB
Go
49 lines
1.8 KiB
Go
/*
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Copyright 2013 CoreOS Inc.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package store
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type watcher struct {
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eventChan chan *Event
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recursive bool
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sinceIndex uint64
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}
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// notify function notifies the watcher. If the watcher interests in the given path,
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// the function will return true.
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func (w *watcher) notify(e *Event, originalPath bool, deleted bool) bool {
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// watcher is interested the path in three cases and under one condition
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// the condition is that the event happens after the watcher's sinceIndex
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// 1. the path at which the event happens is the path the watcher is watching at.
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// For example if the watcher is watching at "/foo" and the event happens at "/foo",
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// the watcher must be interested in that event.
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// 2. the watcher is a recursive watcher, it interests in the event happens after
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// its watching path. For example if watcher A watches at "/foo" and it is a recursive
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// one, it will interest in the event happens at "/foo/bar".
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// 3. when we delete a directory, we need to force notify all the watchers who watches
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// at the file we need to delete.
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// For example a watcher is watching at "/foo/bar". And we deletes "/foo". The watcher
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// should get notified even if "/foo" is not the path it is watching.
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if (w.recursive || originalPath || deleted) && e.Index() >= w.sinceIndex {
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w.eventChan <- e
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return true
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}
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return false
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}
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