/
Daemon.scala
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/
Daemon.scala
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package jp.w3ch.psm.service
import java.net.InetSocketAddress
import com.twitter.conversions.time._
import com.twitter.finagle.builder.ClientBuilder
import com.twitter.finagle.service.{Backoff,RetryPolicy}
import com.twitter.finagle.http.{Http,Request,Method}
import com.twitter.util.{Future,Promise,Time}
import org.jboss.netty.handler.codec.http._
import jp.w3ch.psm.daemon
import jp.w3ch.psm.util.Timer;
class Daemon(dm:daemon.Daemon, address:InetSocketAddress) extends HttpService {
var lastRequestedAt = Time.now
val stopTimer = Timer.schedule(5.seconds) {
if(lastRequestedAt + 5.minutes < Time.now) {
executor.stop()
}
}
val executor = dm
val port = new Port(address)
def exec = executor.exec()
def this(dm:daemon.Daemon, address: Int) = this(dm, new InetSocketAddress("127.0.0.1", address))
override def apply(request:HttpRequest) = {
lastRequestedAt = Time.now
for {
_ <- waitForPort(1)
.rescue {
case _ => Future(exec).join(waitForPort(4))
}
response <- port(request)
} yield(response)
}
def waitForPort(retry:Int) = {
val client = ClientBuilder()
.codec(Http())
.hosts(address)
.hostConnectionLimit(1)
.retryPolicy(
RetryPolicy.backoff(Backoff.const(500.milliseconds).take(retry - 1))(RetryPolicy.WriteExceptionsOnly))
.build()
client(Request(Method.Head, "/")).unit
}
}
// vim: set ts=2 sw=2 et: