55 lines
1.9 KiB
Scala
55 lines
1.9 KiB
Scala
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/**
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* Copyright (C) 2009-2014 Typesafe Inc. <http://www.typesafe.com>
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*/
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package akka.remote
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import scala.concurrent.duration.Duration
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import scala.concurrent.duration.FiniteDuration
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import com.typesafe.config.Config
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import akka.event.EventStream
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import akka.remote.FailureDetector.Clock
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import akka.util.Helpers.ConfigOps
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/**
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* Implementation of failure detector using an absolute timeout of missing heartbeats
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* to trigger unavailability.
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*
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* @param acceptableHeartbeatPause Duration corresponding to number of potentially lost/delayed
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* heartbeats that will be accepted before considering it to be an anomaly.
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*
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* @param clock The clock, returning current time in milliseconds, but can be faked for testing
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* purposes. It is only used for measuring intervals (duration).
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*/
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class DeadlineFailureDetector(
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val acceptableHeartbeatPause: FiniteDuration)(
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implicit clock: Clock) extends FailureDetector {
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/**
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* Constructor that reads parameters from config.
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* Expecting config properties named `acceptable-heartbeat-pause`.
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*/
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def this(config: Config, ev: EventStream) =
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this(acceptableHeartbeatPause = config.getMillisDuration("acceptable-heartbeat-pause"))
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require(acceptableHeartbeatPause >= Duration.Zero, "failure-detector.acceptable-heartbeat-pause must be >= 0")
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private val acceptableHeartbeatPauseMillis = acceptableHeartbeatPause.toMillis
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@volatile private var heartbeatTimestamp = 0L //not used until active (first heartbeat)
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@volatile private var active = false
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override def isAvailable: Boolean = isAvailable(clock())
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private def isAvailable(timestamp: Long): Boolean =
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if (active) (heartbeatTimestamp + acceptableHeartbeatPauseMillis) > timestamp
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else true // treat unmanaged connections, e.g. with zero heartbeats, as healthy connections
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override def isMonitoring: Boolean = active
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final override def heartbeat(): Unit = {
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heartbeatTimestamp = clock()
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active = true
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}
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}
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