youtubebeat/vendor/github.com/elastic/beats/filebeat/beater/signalwait.go

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2018-11-18 11:08:38 +01:00
// Licensed to Elasticsearch B.V. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you 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 beater
import (
"sync"
"time"
"github.com/elastic/beats/libbeat/logp"
)
type signalWait struct {
count int // number of potential 'alive' signals
signals chan struct{}
}
type signaler func()
func newSignalWait() *signalWait {
return &signalWait{
signals: make(chan struct{}, 1),
}
}
func (s *signalWait) Wait() {
if s.count == 0 {
return
}
<-s.signals
s.count--
}
func (s *signalWait) Add(fn signaler) {
s.count++
go func() {
fn()
var v struct{}
s.signals <- v
}()
}
func (s *signalWait) AddChan(c <-chan struct{}) {
s.Add(waitChannel(c))
}
func (s *signalWait) AddTimer(t *time.Timer) {
s.Add(waitTimer(t))
}
func (s *signalWait) AddTimeout(d time.Duration) {
s.Add(waitDuration(d))
}
func (s *signalWait) Signal() {
s.Add(func() {})
}
func waitGroup(wg *sync.WaitGroup) signaler {
return wg.Wait
}
func waitChannel(c <-chan struct{}) signaler {
return func() { <-c }
}
func waitTimer(t *time.Timer) signaler {
return func() { <-t.C }
}
func waitDuration(d time.Duration) signaler {
return waitTimer(time.NewTimer(d))
}
func withLog(s signaler, msg string) signaler {
return func() {
s()
logp.Info("%v", msg)
}
}