AbstractPortSearchingJerseyTest.scala
308b6e8da08cdevelop

AbstractPortSearchingJerseyTest.scala
View Options

			package net.shrine.util

			import com.sun.jersey.test.framework.JerseyTest
			import scala.util.Try
			import java.net.Socket
			import java.io.IOException

			/**
			* @author clint
			* @date Oct 23, 2014
			*/
			abstract class AbstractPortSearchingJerseyTest extends JerseyTest {

			//Attempt to find the next available port, starting from defaultPort. This creates a race condition
			//in that other JerseyTests could "steal" the port returned by this method by binding to the port after
			//this method returns and before the result is used to start an embedded HTTP server, but this is
			//better than always failing in the face of a parallelized build, or another concurrent build on the
			//same machine, as was previously the case.
			override protected def getPort(defaultPort: Int): Int = {
			Try(nextAvailablePort(defaultPort)).getOrElse(super.getPort(defaultPort))
			}

			private def nextAvailablePort(start: Int): Int = {
			Iterator.from(start).take(100).takeWhile(isAvailable).next
			}

			private def isAvailable(port: Int): Boolean = {
			var s: Socket = null

			try {
			s = new Socket("localhost", port)

			false
			} catch {
			case e: IOException => true
			} finally {
			if (s != null) {
			s.close()
			}
			}
			}
			}