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pkg/notify/notify.go
52 строки
1 KB
Marek Siarkowicz
server: Extract notifier struct
10 сен 2021, 11:16
10 сен 2021, 11:16
9d81dde
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// Copyright 2021 The etcd Authors // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. package notify import ( "sync" ) // Notifier is a thread safe struct that can be used to send notification about // some event to multiple consumers. type Notifier struct { mu sync.RWMutex channel chan struct{} } // NewNotifier returns new notifier func NewNotifier() *Notifier { return &Notifier{ channel: make(chan struct{}), } } // Receive returns channel that can be used to wait for notification. // Consumers will be informed by closing the channel. func (n *Notifier) Receive() <-chan struct{} { n.mu.RLock() defer n.mu.RUnlock() return n.channel } // Notify closes the channel passed to consumers and creates new channel to used // for next notification. func (n *Notifier) Notify() { newChannel := make(chan struct{}) n.mu.Lock() channelToClose := n.channel n.channel = newChannel n.mu.Unlock() close(channelToClose) }