(refs #28)Add SessionCleanupListener.

src/main/scala/servlet/SessionCleanupListener.scala

@@ -0,0 +1,19 @@
+package servlet
+
+import util.FileUploadUtil
+import javax.servlet.http.{HttpSessionEvent, HttpSessionListener}
+import javax.servlet.annotation.WebListener
+
+/**
+ * Removes session associated temporary files when session is destroyed.
+ */
+class SessionCleanupListener extends HttpSessionListener {
+
+  def sessionCreated(se: HttpSessionEvent): Unit = {}
+
+  def sessionDestroyed(se: HttpSessionEvent): Unit = {
+    println("** session destroyed: " + se.getSession.getId)
+    FileUploadUtil.removeTemporaryFiles()(se.getSession)
+  }
+
+}

src/main/webapp/WEB-INF/web.xml

@@ -4,6 +4,13 @@
       xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
       version="3.0">
 
+  <!-- ===================================================================== -->
+  <!-- Session configuration -->
+  <!-- ===================================================================== -->
+  <listener>
+    <listener-class>servlet.SessionCleanipListener</listener-class>
+  </listener>
+
   <!-- ===================================================================== -->
   <!-- Scalatra configuration -->
   <!-- ===================================================================== -->