first getRequests against dummy index

enhanced error handling for wrong verbs based on algebraic data types

app/controllers/OaiController.scala

 package controllers
 
 import javax.inject.Inject
-import modules.{ElasticsearchComponent, OaiRepository}
-import org.swissbib.memobase.oai.request.OaiRequest
+import modules.OaiRepository
+import org.swissbib.memobase.oai.request.{OaiRequest, OaiRequestIllegalVerb}
 import org.swissbib.memobase.oai.common.verb.OaiVerb
+import org.swissbib.memobase.oai.common.verb.OaiVerb.{OaiVerb, WRONGVERB, getVerb}
 import play.api.Configuration
 import play.api.mvc.{AbstractController, Action, AnyContent, ControllerComponents, Rendering}
 
+import scala.util.{Failure, Success, Try}
+
 class OaiController @Inject()(cc: ControllerComponents,
                               config: Configuration,
                               repository:OaiRepository,
-
                               ) extends AbstractController(cc) with Rendering {
 
 
@@ -26,20 +28,32 @@ class OaiController @Inject()(cc: ControllerComponents,
                     resumptionToken: Option[String]): Action[AnyContent] =
     Action { implicit request =>
 
-      //Todo has to be wrapped with Try because verb might be wrong
-      val enumVerb = OaiVerb.withName(verb)
-      val t = repository
-
-      val request = OaiRequest(enumVerb,
-                  metadataPrefix,
-                  set,
-                  from,
-                  until,
-                  identifier,
-                  resumptionToken
-                  )
+      val oaiRequest = Try[OaiVerb]( OaiVerb.withName(verb)) match {
+          //only allowed are the OAI defined verb values
+          //additionally we have to exclude the WRONGVERB value which is used in the Failure pattern to instantiate
+          //the OaiRequestIllegalVerb type
+        case Success(v) if v != WRONGVERB =>   OaiRequest(
+          v,
+          metadataPrefix,
+          set,
+          from,
+          until,
+          identifier,
+          resumptionToken
+        )
+        case _ => OaiRequestIllegalVerb(
+          //seems to be that Enumeration value and val identifier have to be written in a case sensitive equal way
+          OaiVerb.withName("WRONGVERB"),
+          metadataPrefix,
+          set,
+          from,
+          until,
+          identifier,
+          resumptionToken
+        )
+      }
 
-      val response = request.execute(config, repository).createResponse
+      val response = oaiRequest.execute(config, repository).createResponse
       /*
       todo: make Writable for Node[Seq]
       [info] Compiling 4 Scala sources to /home/swissbib/environment/code/swissbib.repositories/memoriav/gitlab/services/oai/target/scala-2.13/classes ...

app/modules/ElasticsearchComponent.scala

 package modules
 
+import java.util
+
 import com.typesafe.config.Config
 import org.elasticsearch.action.get.GetRequest
 import org.elasticsearch.client.{RequestOptions, RestHighLevelClient}
@@ -7,6 +9,7 @@ import org.swissbib.memobase.oai.common.util.ResumptionToken
 import play.Environment
 import play.api.libs.json.Json
 import utilities.Json2XML
+
 import scala.xml.Node
 
 trait ElasticsearchComponent extends OaiRepository {
@@ -17,18 +20,26 @@ trait ElasticsearchComponent extends OaiRepository {
   //to do: another solution necessary in case  we decide to use several indices for OAI
   val index: String
 
-  override def listRecords(from: Option[String], until: Option[String], set: Option[String], resumptionToken: Option[ResumptionToken], metadataPrefix: String): Seq[Node] = ???
+  override def listRecords(from: Option[String],
+                           until: Option[String],
+                           set: Option[String],
+                           resumptionToken: Option[ResumptionToken],
+                           metadataPrefix: String): Seq[Node] = ???
 
-  override def listIdentiers(from: Option[String], until: Option[String], set: Option[String], resumptionToken: Option[ResumptionToken], metadataPrefix: String): Seq[Node] = ???
+  override def listIdentiers(from: Option[String],
+                             until: Option[String],
+                             set: Option[String],
+                             resumptionToken: Option[ResumptionToken],
+                             metadataPrefix: String): Seq[Node] = ???
 
-  override def getRecord(identifier: String, metadataPrefix: String): Option[Node] = {
+  override def getRecord(identifier: String,
+                         metadataPrefix: String): Option[Node] = {
 
     val getRequest = new GetRequest(index, identifier)
     val getResponse = client.get.get(getRequest, RequestOptions.DEFAULT)
 
     //todo: what if response is empty?
-    val sourceMap = getResponse.getSourceAsMap
-    Option(Json2XML.singleJsonDoc2Xml(Json.parse(play.libs.Json.toJson(sourceMap).toString)))
-
+    val sM : Option[util.Map[String, AnyRef]] = Option(getResponse.getSourceAsMap)
+    sM.map(hash => Json2XML.singleJsonDoc2Xml(Json.parse(play.libs.Json.toJson(hash).toString)))
   }
 }

app/modules/ElasticsearchModule.scala

 package modules
 
-import com.google.inject.AbstractModule
+  import com.google.inject.AbstractModule
 
 class ElasticsearchModule extends AbstractModule{
 

app/org/swissbib/memobase/oai/common/verb/OaiVerb.scala

@@ -17,6 +17,7 @@ object OaiVerb extends Enumeration {
   val GetRecord: OaiVal = OaiVal("GetRecord")
   val ListMetadataFormats: OaiVal = OaiVal("ListMetadataFormats")
   val Identify: OaiVal = OaiVal("Identify")
+  val WRONGVERB: OaiVal = OaiVal("WRONGVERB")
 
 
 

app/org/swissbib/memobase/oai/request/OaiRequest.scala

@@ -4,17 +4,34 @@ import modules.OaiRepository
 import org.swissbib.memobase.oai.response.OaiResponse
 import org.swissbib.memobase.oai.common.verb.OaiVerb
 import org.swissbib.memobase.oai.common.verb.OaiVerb.OaiVerb
-import org.swissbib.memobase.oai.runner.{GetRecordRunner, IdentifyRunner,
-  ListIdentifiersRunner, ListMetadataFormatsRunner, ListRecordsRunner, ListSetsRunner}
+import org.swissbib.memobase.oai.runner.{GetExceptionRunner, GetRecordRunner, IdentifyRunner, ListIdentifiersRunner, ListMetadataFormatsRunner, ListRecordsRunner, ListSetsRunner}
 import play.api.Configuration
 
-case class OaiRequest(verb:OaiVerb,
-                      metadataPrefix: Option[String],
-                      set: Option[String],
-                      from:Option[String],
-                      until:Option[String],
-                      identifier: Option[String],
-                      resumptionToken: Option[String]) {
+sealed abstract class UserRequest(val verb:OaiVerb,
+                                  val metadataPrefix: Option[String],
+                                  val set: Option[String],
+                                  val from:Option[String],
+                                  val until:Option[String],
+                                  val identifier: Option[String],
+                                  val resumptionToken: Option[String]) {
+
+  def execute(config: Configuration, repository:OaiRepository): OaiResponse
+}
+
+case class OaiRequest(override val verb:OaiVerb,
+                      override val metadataPrefix: Option[String],
+                      override val set: Option[String],
+                      override val from:Option[String],
+                      override val until:Option[String],
+                      override val identifier: Option[String],
+                      override val resumptionToken: Option[String]) extends UserRequest(verb,
+                                                                          metadataPrefix,
+                                                                          set,
+                                                                          from,
+                                                                          until,
+                                                                          identifier,
+                                                                          resumptionToken) {
+
 
   def hasNecessaryArguments:Boolean = {
 
@@ -162,7 +179,7 @@ case class OaiRequest(verb:OaiVerb,
   //todo: validation for supplied argument
   def areArgumentsValid: Boolean = true
 
-  def execute(config: Configuration, repository:OaiRepository): OaiResponse = {
+  override def execute(config: Configuration, repository:OaiRepository): OaiResponse = {
 
     //todo: too much imperative programming, make it more functional!
     if (hasNecessaryArguments && areArgumentsValid) {
@@ -188,3 +205,23 @@ case class OaiRequest(verb:OaiVerb,
 
 
 }
+
+case class OaiRequestIllegalVerb(override val  verb:OaiVerb,
+                                 override val metadataPrefix: Option[String],
+                                 override val set: Option[String],
+                                 override val from:Option[String],
+                                 override val until:Option[String],
+                                 override val identifier: Option[String],
+                                 override val resumptionToken: Option[String]) extends UserRequest(
+                                                                        verb,
+                                                                        metadataPrefix,
+                                                                        set,
+                                                                        from,
+                                                                        until,
+                                                                        identifier,
+                                                                        resumptionToken) {
+
+  override def execute(config: Configuration, repository:OaiRepository): OaiResponse =
+    GetExceptionRunner(config, repository, this).run()
+
+                      }
\ No newline at end of file

app/org/swissbib/memobase/oai/runner/OaiRequestRunner.scala

 package org.swissbib.memobase.oai.runner
 
 import modules.OaiRepository
-import org.swissbib.memobase.oai.request.OaiRequest
-import org.swissbib.memobase.oai.response.{GetRecordResponse, IdentifyResponse, ListIdentifiersResponse, ListMetadaFormatsResponse, ListRecordsResponse, ListSetsResponse, OaiResponse}
+import org.swissbib.memobase.oai.request.{OaiRequest, UserRequest}
+import org.swissbib.memobase.oai.response.{GetRecordResponse, IdentifyResponse, ListIdentifiersResponse,
+  ListMetadaFormatsResponse, ListRecordsResponse, ListSetsResponse, OaiResponse}
 import play.api.Configuration
 
+import scala.xml.Node
+
 abstract class OaiRequestRunner (val config: Configuration,
                                  val repository: OaiRepository,
-                                  val request: OaiRequest){
+                                  val request: UserRequest){
+  var result: Option[Node] = None
   def run(): OaiResponse
 }
 
 
+//todo: this is wrong!
 sealed case class IdentifyRunner(override val config: Configuration,
                                  override val repository: OaiRepository,
                                  override val request: OaiRequest) extends OaiRequestRunner( config,
@@ -33,7 +38,8 @@ case class GetRecordRunner(override val config: Configuration,
   override def run(): OaiResponse = {
 
     //Identify doesnit need any action on repository
-    val node = repository.getRecord(request.identifier.get,request.metadataPrefix.get)
+    result = repository.getRecord(request.identifier.get,request.metadataPrefix.get)
+
 
     GetRecordResponse(this)
   }
@@ -83,6 +89,15 @@ case class ListSetsRunner(override val config: Configuration,
 }
 
 
+case class GetExceptionRunner(override val config: Configuration,
+                           override val repository: OaiRepository,
+                           override val request: UserRequest) extends OaiRequestRunner( config,
+  repository,
+  request) {
+  override def run(): OaiResponse = ???
+}
+
+
 /*
 I think we do not need it any more...
  */

doc/oai.graphml

+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<graphml xmlns="http://graphml.graphdrawing.org/xmlns" xmlns:java="http://www.yworks.com/xml/yfiles-common/1.0/java" xmlns:sys="http://www.yworks.com/xml/yfiles-common/markup/primitives/2.0" xmlns:x="http://www.yworks.com/xml/yfiles-common/markup/2.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:y="http://www.yworks.com/xml/graphml" xmlns:yed="http://www.yworks.com/xml/yed/3" xsi:schemaLocation="http://graphml.graphdrawing.org/xmlns http://www.yworks.com/xml/schema/graphml/1.1/ygraphml.xsd">
+  <!--Created by yEd 3.19-->
+  <key attr.name="Description" attr.type="string" for="graph" id="d0"/>
+  <key for="port" id="d1" yfiles.type="portgraphics"/>
+  <key for="port" id="d2" yfiles.type="portgeometry"/>
+  <key for="port" id="d3" yfiles.type="portuserdata"/>
+  <key attr.name="url" attr.type="string" for="node" id="d4"/>
+  <key attr.name="description" attr.type="string" for="node" id="d5"/>
+  <key for="node" id="d6" yfiles.type="nodegraphics"/>
+  <key for="graphml" id="d7" yfiles.type="resources"/>
+  <key attr.name="url" attr.type="string" for="edge" id="d8"/>
+  <key attr.name="description" attr.type="string" for="edge" id="d9"/>
+  <key for="edge" id="d10" yfiles.type="edgegraphics"/>
+  <graph edgedefault="directed" id="G">
+    <data key="d0"/>
+    <node id="n0">
+      <data key="d4" xml:space="preserve"/>
+      <data key="d5"/>
+      <data key="d6">
+        <y:UMLClassNode>
+          <y:Geometry height="91.0" width="158.0" x="152.0" y="131.0"/>
+          <y:Fill color="#C0C0C0" transparent="false"/>
+          <y:BorderStyle color="#000000" type="line" width="1.0"/>
+          <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="13" fontStyle="bold" hasBackgroundColor="false" hasLineColor="false" height="19.1328125" horizontalTextPosition="center" iconTextGap="4" modelName="custom" textColor="#000000" verticalTextPosition="bottom" visible="true" width="107.568359375" x="25.2158203125" xml:space="preserve" y="25.96875">OaiRepository<y:LabelModel><y:SmartNodeLabelModel distance="4.0"/></y:LabelModel><y:ModelParameter><y:SmartNodeLabelModelParameter labelRatioX="0.0" labelRatioY="0.0" nodeRatioX="0.0" nodeRatioY="0.0" offsetX="0.0" offsetY="0.0" upX="0.0" upY="-1.0"/></y:ModelParameter></y:NodeLabel>
+          <y:UML clipContent="true" constraint="" hasDetailsColor="false" omitDetails="false" stereotype="&lt;&lt;trait&gt;&gt;" use3DEffect="true">
+            <y:AttributeLabel xml:space="preserve"/>
+            <y:MethodLabel xml:space="preserve">listRecords
+listIdentifiers
+getRecord</y:MethodLabel>
+          </y:UML>
+        </y:UMLClassNode>
+      </data>
+    </node>
+    <node id="n1">
+      <data key="d4" xml:space="preserve"/>
+      <data key="d5"/>
+      <data key="d6">
+        <y:UMLClassNode>
+          <y:Geometry height="68.0" width="248.0" x="107.0" y="314.0"/>
+          <y:Fill color="#C0C0C0" transparent="false"/>
+          <y:BorderStyle color="#000000" type="line" width="1.0"/>
+          <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="13" fontStyle="bold" hasBackgroundColor="false" hasLineColor="false" height="19.1328125" horizontalTextPosition="center" iconTextGap="4" modelName="custom" textColor="#000000" verticalTextPosition="bottom" visible="true" width="184.7177734375" x="31.64111328125" xml:space="preserve" y="25.96875">ElasticsearchComponent<y:LabelModel><y:SmartNodeLabelModel distance="4.0"/></y:LabelModel><y:ModelParameter><y:SmartNodeLabelModelParameter labelRatioX="0.0" labelRatioY="0.0" nodeRatioX="0.0" nodeRatioY="0.0" offsetX="0.0" offsetY="0.0" upX="0.0" upY="-1.0"/></y:ModelParameter></y:NodeLabel>
+          <y:UML clipContent="true" constraint="" hasDetailsColor="false" omitDetails="false" stereotype="&lt;&lt;trait&gt;&gt;" use3DEffect="true">
+            <y:AttributeLabel xml:space="preserve"/>
+            <y:MethodLabel xml:space="preserve"/>
+          </y:UML>
+        </y:UMLClassNode>
+      </data>
+    </node>
+    <node id="n2">
+      <data key="d4" xml:space="preserve"/>
+      <data key="d5"/>
+      <data key="d6">
+        <y:UMLClassNode>
+          <y:Geometry height="28.0" width="248.0" x="433.0" y="324.0"/>
+          <y:Fill color="#C0C0C0" transparent="false"/>
+          <y:BorderStyle color="#000000" type="line" width="1.0"/>
+          <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="13" fontStyle="bold" hasBackgroundColor="false" hasLineColor="false" height="19.1328125" horizontalTextPosition="center" iconTextGap="4" modelName="custom" textColor="#000000" verticalTextPosition="bottom" visible="true" width="205.24609375" x="21.376953125" xml:space="preserve" y="3.0">com.typesafe.config.Config<y:LabelModel><y:SmartNodeLabelModel distance="4.0"/></y:LabelModel><y:ModelParameter><y:SmartNodeLabelModelParameter labelRatioX="0.0" labelRatioY="0.0" nodeRatioX="0.0" nodeRatioY="0.0" offsetX="0.0" offsetY="0.0" upX="0.0" upY="-1.0"/></y:ModelParameter></y:NodeLabel>
+          <y:UML clipContent="true" constraint="" hasDetailsColor="false" omitDetails="false" stereotype="" use3DEffect="true">
+            <y:AttributeLabel xml:space="preserve"/>
+            <y:MethodLabel xml:space="preserve"/>
+          </y:UML>
+        </y:UMLClassNode>
+      </data>
+    </node>
+    <node id="n3">
+      <data key="d4" xml:space="preserve"/>
+      <data key="d5"/>
+      <data key="d6">
+        <y:UMLClassNode>
+          <y:Geometry height="28.0" width="248.0" x="439.0" y="372.0"/>
+          <y:Fill color="#C0C0C0" transparent="false"/>
+          <y:BorderStyle color="#000000" type="line" width="1.0"/>
+          <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="13" fontStyle="bold" hasBackgroundColor="false" hasLineColor="false" height="19.1328125" horizontalTextPosition="center" iconTextGap="4" modelName="custom" textColor="#000000" verticalTextPosition="bottom" visible="true" width="133.44140625" x="57.279296875" xml:space="preserve" y="3.0">play.Environment<y:LabelModel><y:SmartNodeLabelModel distance="4.0"/></y:LabelModel><y:ModelParameter><y:SmartNodeLabelModelParameter labelRatioX="0.0" labelRatioY="0.0" nodeRatioX="0.0" nodeRatioY="0.0" offsetX="0.0" offsetY="0.0" upX="0.0" upY="-1.0"/></y:ModelParameter></y:NodeLabel>
+          <y:UML clipContent="true" constraint="" hasDetailsColor="false" omitDetails="false" stereotype="" use3DEffect="true">
+            <y:AttributeLabel xml:space="preserve"/>
+            <y:MethodLabel xml:space="preserve"/>
+          </y:UML>
+        </y:UMLClassNode>
+      </data>
+    </node>
+    <node id="n4">
+      <data key="d4" xml:space="preserve"/>
+      <data key="d5"/>
+      <data key="d6">
+        <y:UMLClassNode>
+          <y:Geometry height="34.0" width="248.0" x="107.0" y="468.0"/>
+          <y:Fill color="#C0C0C0" transparent="false"/>
+          <y:BorderStyle color="#000000" type="line" width="1.0"/>
+          <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="13" fontStyle="bold" hasBackgroundColor="false" hasLineColor="false" height="19.1328125" horizontalTextPosition="center" iconTextGap="4" modelName="custom" textColor="#000000" verticalTextPosition="bottom" visible="true" width="143.6611328125" x="52.16943359375" xml:space="preserve" y="3.0">ElasticsearchClient<y:LabelModel><y:SmartNodeLabelModel distance="4.0"/></y:LabelModel><y:ModelParameter><y:SmartNodeLabelModelParameter labelRatioX="0.0" labelRatioY="0.0" nodeRatioX="0.0" nodeRatioY="0.0" offsetX="0.0" offsetY="0.0" upX="0.0" upY="-1.0"/></y:ModelParameter></y:NodeLabel>
+          <y:UML clipContent="true" constraint="" hasDetailsColor="false" omitDetails="false" stereotype="" use3DEffect="true">
+            <y:AttributeLabel xml:space="preserve"/>
+            <y:MethodLabel xml:space="preserve"/>
+          </y:UML>
+        </y:UMLClassNode>
+      </data>
+    </node>
+    <node id="n5">
+      <data key="d4" xml:space="preserve"/>
+      <data key="d5"/>
+      <data key="d6">
+        <y:UMLClassNode>
+          <y:Geometry height="34.0" width="248.0" x="433.5" y="532.0"/>
+          <y:Fill color="#C0C0C0" transparent="false"/>
+          <y:BorderStyle color="#000000" type="line" width="1.0"/>
+          <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="13" fontStyle="bold" hasBackgroundColor="false" hasLineColor="false" height="19.1328125" horizontalTextPosition="center" iconTextGap="4" modelName="custom" textColor="#000000" verticalTextPosition="bottom" visible="true" width="154.62353515625" x="46.688232421875" xml:space="preserve" y="3.0">ElasticsearchModule<y:LabelModel><y:SmartNodeLabelModel distance="4.0"/></y:LabelModel><y:ModelParameter><y:SmartNodeLabelModelParameter labelRatioX="0.0" labelRatioY="0.0" nodeRatioX="0.0" nodeRatioY="0.0" offsetX="0.0" offsetY="0.0" upX="0.0" upY="-1.0"/></y:ModelParameter></y:NodeLabel>
+          <y:UML clipContent="true" constraint="" hasDetailsColor="false" omitDetails="false" stereotype="" use3DEffect="true">
+            <y:AttributeLabel xml:space="preserve"/>
+            <y:MethodLabel xml:space="preserve"/>
+          </y:UML>
+        </y:UMLClassNode>
+      </data>
+    </node>
+    <node id="n6">
+      <data key="d4" xml:space="preserve"/>
+      <data key="d5"/>
+      <data key="d6">
+        <y:UMLClassNode>
+          <y:Geometry height="34.0" width="259.0" x="428.0" y="468.0"/>
+          <y:Fill color="#C0C0C0" transparent="false"/>
+          <y:BorderStyle color="#000000" type="line" width="1.0"/>
+          <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="13" fontStyle="bold" hasBackgroundColor="false" hasLineColor="false" height="19.1328125" horizontalTextPosition="center" iconTextGap="4" modelName="custom" textColor="#000000" verticalTextPosition="bottom" visible="true" width="255.7734375" x="1.61328125" xml:space="preserve" y="3.0">com.google.inject.AbstractModule<y:LabelModel><y:SmartNodeLabelModel distance="4.0"/></y:LabelModel><y:ModelParameter><y:SmartNodeLabelModelParameter labelRatioX="0.0" labelRatioY="0.0" nodeRatioX="0.0" nodeRatioY="0.0" offsetX="0.0" offsetY="0.0" upX="0.0" upY="-1.0"/></y:ModelParameter></y:NodeLabel>
+          <y:UML clipContent="true" constraint="" hasDetailsColor="false" omitDetails="false" stereotype="" use3DEffect="true">
+            <y:AttributeLabel xml:space="preserve"/>
+            <y:MethodLabel xml:space="preserve"/>
+          </y:UML>
+        </y:UMLClassNode>
+      </data>
+    </node>
+    <node id="n7">
+      <data key="d4" xml:space="preserve"/>
+      <data key="d5"/>
+      <data key="d6">
+        <y:UMLClassNode>
+          <y:Geometry height="91.0" width="248.0" x="107.0" y="665.0"/>
+          <y:Fill color="#C0C0C0" transparent="false"/>
+          <y:BorderStyle color="#000000" type="line" width="1.0"/>
+          <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="13" fontStyle="bold" hasBackgroundColor="false" hasLineColor="false" height="19.1328125" horizontalTextPosition="center" iconTextGap="4" modelName="custom" textColor="#000000" verticalTextPosition="bottom" visible="true" width="101.703125" x="73.1484375" xml:space="preserve" y="3.0">OaiController<y:LabelModel><y:SmartNodeLabelModel distance="4.0"/></y:LabelModel><y:ModelParameter><y:SmartNodeLabelModelParameter labelRatioX="0.0" labelRatioY="0.0" nodeRatioX="0.0" nodeRatioY="0.0" offsetX="0.0" offsetY="0.0" upX="0.0" upY="-1.0"/></y:ModelParameter></y:NodeLabel>
+          <y:UML clipContent="true" constraint="" hasDetailsColor="false" omitDetails="false" stereotype="" use3DEffect="true">
+            <y:AttributeLabel xml:space="preserve"/>
+            <y:MethodLabel xml:space="preserve">handleRequest</y:MethodLabel>
+          </y:UML>
+        </y:UMLClassNode>
+      </data>
+    </node>
+    <edge id="e0" source="n1" target="n0">
+      <data key="d9"/>
+      <data key="d10">
+        <y:PolyLineEdge>
+          <y:Path sx="0.0" sy="0.0" tx="0.0" ty="0.0"/>
+          <y:LineStyle color="#000000" type="line" width="1.0"/>
+          <y:Arrows source="none" target="white_delta"/>
+          <y:BendStyle smoothed="false"/>
+        </y:PolyLineEdge>
+      </data>
+    </edge>
+    <edge id="e1" source="n1" target="n2">
+      <data key="d9"/>
+      <data key="d10">
+        <y:PolyLineEdge>
+          <y:Path sx="0.0" sy="0.0" tx="0.0" ty="0.0"/>
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+          <y:BendStyle smoothed="false"/>
+        </y:PolyLineEdge>
+      </data>
+    </edge>
+    <edge id="e2" source="n1" target="n3">
+      <data key="d9"/>
+      <data key="d10">
+        <y:PolyLineEdge>
+          <y:Path sx="0.0" sy="0.0" tx="0.0" ty="0.0"/>
+          <y:LineStyle color="#000000" type="line" width="1.0"/>
+          <y:Arrows source="none" target="delta"/>
+          <y:BendStyle smoothed="false"/>
+        </y:PolyLineEdge>
+      </data>
+    </edge>
+    <edge id="e3" source="n4" target="n1">
+      <data key="d9"/>
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