96 lines
1.9 KiB
Go
96 lines
1.9 KiB
Go
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// Licensed to Elasticsearch B.V. under one or more contributor
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// license agreements. See the NOTICE file distributed with
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// this work for additional information regarding copyright
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// ownership. Elasticsearch B.V. licenses this file to you under
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// the Apache License, Version 2.0 (the "License"); you may
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// 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,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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package beater
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import (
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"sync"
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"time"
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"github.com/elastic/beats/libbeat/logp"
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)
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type signalWait struct {
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count int // number of potential 'alive' signals
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signals chan struct{}
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}
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type signaler func()
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func newSignalWait() *signalWait {
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return &signalWait{
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signals: make(chan struct{}, 1),
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}
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}
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func (s *signalWait) Wait() {
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if s.count == 0 {
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return
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}
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<-s.signals
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s.count--
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}
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func (s *signalWait) Add(fn signaler) {
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s.count++
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go func() {
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fn()
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var v struct{}
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s.signals <- v
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}()
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}
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func (s *signalWait) AddChan(c <-chan struct{}) {
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s.Add(waitChannel(c))
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}
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func (s *signalWait) AddTimer(t *time.Timer) {
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s.Add(waitTimer(t))
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}
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func (s *signalWait) AddTimeout(d time.Duration) {
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s.Add(waitDuration(d))
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}
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func (s *signalWait) Signal() {
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s.Add(func() {})
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}
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func waitGroup(wg *sync.WaitGroup) signaler {
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return wg.Wait
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}
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func waitChannel(c <-chan struct{}) signaler {
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return func() { <-c }
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}
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func waitTimer(t *time.Timer) signaler {
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return func() { <-t.C }
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}
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func waitDuration(d time.Duration) signaler {
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return waitTimer(time.NewTimer(d))
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}
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func withLog(s signaler, msg string) signaler {
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return func() {
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s()
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logp.Info("%v", msg)
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}
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}
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