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heartbeat.go
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heartbeat.go
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package main
import (
"log"
"time"
)
type HeartbeatFailureCallback func(name string, isFailure bool)
type HeartbeatMonitor struct {
timeline *Timeline
name string
period time.Duration
lastHeartbeat time.Time
callback HeartbeatFailureCallback
failed bool
}
func (h *HeartbeatMonitor) scheduleHeartbeatTimeout() {
nextTimeout := h.lastHeartbeat.Add(h.period)
h.timeline.Schedule(nextTimeout, func() { h.checkHeartbeatTimeout() } )
}
func (h *HeartbeatMonitor) checkHeartbeatTimeout() {
if h.timeline.Now().Sub(h.lastHeartbeat) >= h.period {
log.Println("failure",h.name);
h.failed = true
h.callback(h.name, h.failed)
}
}
func (h *HeartbeatMonitor) Start() {
h.lastHeartbeat = h.timeline.Now()
h.scheduleHeartbeatTimeout()
}
func (h *HeartbeatMonitor) Heartbeat() {
h.lastHeartbeat = h.timeline.Now()
if h.failed {
log.Println("okay",h.name);
h.failed = false
}
h.callback(h.name, h.failed)
h.scheduleHeartbeatTimeout()
}
func NewHeartbeatMonitor ( timeline *Timeline, name string, period time.Duration, callback HeartbeatFailureCallback) *HeartbeatMonitor {
m := &HeartbeatMonitor{timeline, name, period, time.Now(), callback, false}
return m
}