зеркало из https://github.com/github/vitess-gh.git
55 строки
1.3 KiB
Go
55 строки
1.3 KiB
Go
/*
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Copyright 2019 The Vitess Authors.
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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 event
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import (
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"sync"
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)
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// Hooks holds a list of parameter-less functions to call whenever the set is
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// triggered with Fire().
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type Hooks struct {
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funcs []func()
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mu sync.Mutex
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}
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// Add appends the given function to the list to be triggered.
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func (h *Hooks) Add(f func()) {
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h.mu.Lock()
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defer h.mu.Unlock()
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h.funcs = append(h.funcs, f)
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}
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// Fire calls all the functions in a given Hooks list. It launches a goroutine
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// for each function and then waits for all of them to finish before returning.
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// Concurrent calls to Fire() are serialized.
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func (h *Hooks) Fire() {
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h.mu.Lock()
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defer h.mu.Unlock()
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wg := sync.WaitGroup{}
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for _, f := range h.funcs {
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wg.Add(1)
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go func(f func()) {
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f()
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wg.Done()
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}(f)
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}
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wg.Wait()
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}
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