mirror of
https://github.com/etcd-io/etcd.git
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53 lines
1.4 KiB
Go
53 lines
1.4 KiB
Go
// Copyright 2021 The etcd Authors
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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 notify
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import (
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"sync"
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)
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// Notifier is a thread safe struct that can be used to send notification about
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// some event to multiple consumers.
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type Notifier struct {
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mu sync.RWMutex
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channel chan struct{}
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}
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// NewNotifier returns new notifier
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func NewNotifier() *Notifier {
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return &Notifier{
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channel: make(chan struct{}),
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}
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}
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// Receive returns channel that can be used to wait for notification.
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// Consumers will be informed by closing the channel.
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func (n *Notifier) Receive() <-chan struct{} {
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n.mu.RLock()
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defer n.mu.RUnlock()
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return n.channel
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}
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// Notify closes the channel passed to consumers and creates new channel to used
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// for next notification.
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func (n *Notifier) Notify() {
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newChannel := make(chan struct{})
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n.mu.Lock()
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channelToClose := n.channel
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n.channel = newChannel
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n.mu.Unlock()
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close(channelToClose)
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}
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