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// Copyright (c) 2017 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package metrics
import (
"time"
"go.uber.org/net/metrics/push"
)
type pusher struct {
core *core
stop chan struct{}
stopped chan struct{}
ticker *time.Ticker
target push.Target
}
func newPusher(c *core, target push.Target, tick time.Duration) *pusher {
return &pusher{
core: c,
stop: make(chan struct{}),
stopped: make(chan struct{}),
ticker: time.NewTicker(tick),
target: target,
}
}
func (p *pusher) Start() {
defer close(p.stopped)
// When stopping, do one last export to catch any stragglers.
defer p.core.push(p.target)
for {
select {
case <-p.stop:
return
case <-p.ticker.C:
p.core.push(p.target)
}
}
}
func (p *pusher) Stop() {
p.ticker.Stop()
close(p.stop)
<-p.stopped
}
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