/*

  * Copyright 2006-2011 The Kuali Foundation

  *

  * Licensed under the Educational Community License, Version 2.0 (the "License");

  * you may not use this file except in compliance with the License.

  * You may obtain a copy of the License at

  *

  * http://www.opensource.org/licenses/ecl2.php

  *

  * Unless required by applicable law or agreed to in writing, software

  * distributed under the License is distributed on an "AS IS" BASIS,

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  * See the License for the specific language governing permissions and

  * limitations under the License.

  */

 package org.kuali.rice.kew.engine;

 import java.util.ArrayList;

 import java.util.Collection;

 import java.util.Iterator;

 import java.util.LinkedList;

 import java.util.List;

 import org.apache.log4j.MDC;

 import org.kuali.rice.core.framework.parameter.ParameterService;

 import org.kuali.rice.kew.actionrequest.ActionRequestValue;

 import org.kuali.rice.kew.api.doctype.IllegalDocumentTypeException;

 import org.kuali.rice.kew.engine.node.Branch;

 import org.kuali.rice.kew.engine.node.BranchState;

 import org.kuali.rice.kew.engine.node.Process;

 import org.kuali.rice.kew.engine.node.ProcessResult;

 import org.kuali.rice.kew.engine.node.RouteNodeInstance;

 import org.kuali.rice.kew.engine.node.RouteNodeUtils;

 import org.kuali.rice.kew.engine.node.service.RouteNodeService;

 import org.kuali.rice.kew.engine.transition.Transition;

 import org.kuali.rice.kew.engine.transition.TransitionEngine;

 import org.kuali.rice.kew.engine.transition.TransitionEngineFactory;

 import org.kuali.rice.kew.exception.InvalidActionTakenException;

 import org.kuali.rice.kew.exception.RouteManagerException;

 import org.kuali.rice.kew.exception.WorkflowException;

 import org.kuali.rice.kew.postprocessor.AfterProcessEvent;

 import org.kuali.rice.kew.postprocessor.BeforeProcessEvent;

 import org.kuali.rice.kew.postprocessor.DefaultPostProcessor;

 import org.kuali.rice.kew.postprocessor.DocumentLockingEvent;

 import org.kuali.rice.kew.postprocessor.DocumentRouteLevelChange;

 import org.kuali.rice.kew.postprocessor.DocumentRouteStatusChange;

 import org.kuali.rice.kew.postprocessor.PostProcessor;

 import org.kuali.rice.kew.postprocessor.ProcessDocReport;

 import org.kuali.rice.kew.routeheader.DocumentRouteHeaderValue;

 import org.kuali.rice.kew.routeheader.service.RouteHeaderService;

 import org.kuali.rice.kew.service.KEWServiceLocator;

 import org.kuali.rice.kew.util.KEWConstants;

 import org.kuali.rice.kew.util.PerformanceLogger;

 import org.kuali.rice.krad.util.KRADConstants;

 /**

  * The standard and supported implementation of the WorkflowEngine.  Runs a processing loop against a given

  * Document, processing nodes on the document until the document is completed or a node halts the

  * processing.

  *

  * @author Kuali Rice Team (rice.collab@kuali.org)

  */

 public class StandardWorkflowEngine implements WorkflowEngine {

         private static final org.apache.log4j.Logger LOG = org.apache.log4j.Logger.getLogger(StandardWorkflowEngine.class);

         protected final RouteHelper helper = new RouteHelper();

         protected final RouteNodeService routeNodeService;

     protected final RouteHeaderService routeHeaderService;

     protected final ParameterService parameterService;

     protected final OrchestrationConfig config;

 //    public StandardWorkflowEngine() {}

         protected StandardWorkflowEngine(RouteNodeService routeNodeService, RouteHeaderService routeHeaderService, 

                 ParameterService parameterService, OrchestrationConfig config) {

             this.routeNodeService = routeNodeService;

             this.routeHeaderService = routeHeaderService;

             this.parameterService = parameterService;

             this.config = config;

         }

 //        public void setRunPostProcessorLogic(boolean runPostProcessorLogic) {

 //            this.runPostProcessorLogic = runPostProcessorLogic;

 //        }

         public boolean isRunPostProcessorLogic() {

             return this.config.isRunPostProcessorLogic();

         }

         public void process(String documentId, String nodeInstanceId) throws Exception {

                 if (documentId == null) {

                         throw new IllegalArgumentException("Cannot process a null document id.");

                 }

                 MDC.put("docId", documentId);

                 boolean success = true;

                 RouteContext context = RouteContext.createNewRouteContext();

                 try {

                         if ( LOG.isInfoEnabled() ) {

                                 LOG.info("Aquiring lock on document " + documentId);

                         }

                         KEWServiceLocator.getRouteHeaderService().lockRouteHeader(documentId, true);

                         if ( LOG.isInfoEnabled() ) {

                                 LOG.info("Aquired lock on document " + documentId);

                         }

                         DocumentRouteHeaderValue document = getRouteHeaderService().getRouteHeader(documentId);

                         context.setDocument(document);

                         lockAdditionalDocuments(document);

                         if ( LOG.isInfoEnabled() ) {

                                 LOG.info("Processing document: " + documentId + " : " + nodeInstanceId);

                         }

                         try {

                     document = notifyPostProcessorBeforeProcess(document, nodeInstanceId);

                     context.setDocument(document);

             } catch (Exception e) {

                 LOG.warn("Problems contacting PostProcessor before engine process", e);

                 throw new RouteManagerException("Problems contacting PostProcessor:  " + e.getMessage());

             }

             if (!document.isRoutable()) {

                                 LOG.debug("Document not routable so returning with doing no action");

                                 return;

                         }

                         List<RouteNodeInstance> nodeInstancesToProcess = new LinkedList<RouteNodeInstance>();

                         if (nodeInstanceId == null) {

                                 // pulls the node instances from the passed in document

                                 nodeInstancesToProcess.addAll(RouteNodeUtils.getActiveNodeInstances(document));

                         } else {

                                 RouteNodeInstance instanceNode = RouteNodeUtils.findRouteNodeInstanceById(nodeInstanceId,document);

                                 if (instanceNode == null) {

                                         throw new IllegalArgumentException("Invalid node instance id: " + nodeInstanceId);

                                 }

                                 nodeInstancesToProcess.add(instanceNode);

                         }

                         context.setEngineState(new EngineState());

                         ProcessContext processContext = new ProcessContext(true, nodeInstancesToProcess);

                         try {

                                 while (!nodeInstancesToProcess.isEmpty()) {

                                         context.setNodeInstance((RouteNodeInstance) nodeInstancesToProcess.remove(0));

                                         processContext = processNodeInstance(context, helper);

                                         if (processContext.isComplete() && !processContext.getNextNodeInstances().isEmpty()) {

                                                 nodeInstancesToProcess.addAll(processContext.getNextNodeInstances());

                                         }

                                 }

                                 context.setDocument(nodePostProcess(context));

                         } catch (Exception e) {

                                 success = false;

                                 // TODO throw a new 'RoutingException' which holds the

                                 // RoutingState

                                 throw new RouteManagerException(e, context);

                         }

                 } finally {

                         if ( LOG.isInfoEnabled() ) {

                                 LOG.info((success ? "Successfully processed" : "Failed to process") + " document: " + documentId + " : " + nodeInstanceId);

                         }

                         try {

                     notifyPostProcessorAfterProcess(context.getDocument(), nodeInstanceId, success);

             } catch (Exception e) {

                 LOG.warn("Problems contacting PostProcessor after engine process", e);

                 throw new RouteManagerException("Problems contacting PostProcessor:  " + e.getMessage(), context);

             }

                         RouteContext.clearCurrentRouteContext();

                         MDC.remove("docId");

                 }

         }

         protected ProcessContext processNodeInstance(RouteContext context, RouteHelper helper) throws Exception {

                 RouteNodeInstance nodeInstance = context.getNodeInstance();

                 if ( LOG.isDebugEnabled() ) {

                         LOG.debug("Processing node instance: " + nodeInstance.getRouteNode().getRouteNodeName());

                 }

                 if (checkAssertions(context)) {

                         // returning an empty context causes the outer loop to terminate

                         return new ProcessContext();

                 }

                 TransitionEngine transitionEngine = TransitionEngineFactory.createTransitionEngine(nodeInstance);

                 ProcessResult processResult = transitionEngine.isComplete(context);

                 nodeInstance.setInitial(false);

                 // if this nodeInstance already has next node instance we don't need to

                 // go to the TE

                 if (processResult.isComplete()) {

                         if ( LOG.isDebugEnabled() ) {

                                 LOG.debug("Routing node has completed: " + nodeInstance.getRouteNode().getRouteNodeName());

                         }

                         context.getEngineState().getCompleteNodeInstances().add(nodeInstance.getRouteNodeInstanceId());

                         List nextNodeCandidates = invokeTransition(context, context.getNodeInstance(), processResult, transitionEngine);

                         // iterate over the next node candidates sending them through the

                         // transition engine's transitionTo method

                         // one at a time for a potential switch. Place the transition

                         // engines result back in the 'actual' next node

                         // list which we put in the next node before doing work.

                         List<RouteNodeInstance> nodesToActivate = new ArrayList<RouteNodeInstance>();

                         if (!nextNodeCandidates.isEmpty()) {

                                 // KULRICE-4274: Hierarchy Routing Node issues

                                 // No longer change nextNodeInstances in place, instead we create a local and assign our local list below

                                 // the loop so the post processor doesn't save a RouteNodeInstance in an intermediate state

                                 ArrayList<RouteNodeInstance> nextNodeInstances = new ArrayList<RouteNodeInstance>();

                                 for (Iterator nextIt = nextNodeCandidates.iterator(); nextIt.hasNext();) {

                                         RouteNodeInstance nextNodeInstance = (RouteNodeInstance) nextIt.next();

                                         transitionEngine = TransitionEngineFactory.createTransitionEngine(nextNodeInstance);

                                         RouteNodeInstance currentNextNodeInstance = nextNodeInstance;

                                         nextNodeInstance = transitionEngine.transitionTo(nextNodeInstance, context);

                                         // if the next node has changed, we need to remove our

                                         // current node as a next node of the original node

                                         if (!currentNextNodeInstance.equals(nextNodeInstance)) {

                                                 currentNextNodeInstance.getPreviousNodeInstances().remove(nodeInstance);

                                         }

                                         // before adding next node instance, be sure that it's not

                                         // already linked via previous node instances

                                         // this is to prevent the engine from setting up references

                                         // on nodes that already reference each other.

                                         // the primary case being when we are walking over an

                                         // already constructed graph of nodes returned from a

                                         // dynamic node - probably a more sensible approach would be

                                         // to check for the existence of the link and moving on

                                         // if it's been established.

                                         nextNodeInstance.getPreviousNodeInstances().remove(nodeInstance);

                                         nextNodeInstances.add(nextNodeInstance);

                                         handleBackwardCompatibility(context, nextNodeInstance);

                                         // call the post processor

                                         notifyNodeChange(context, nextNodeInstance);

                                         nodesToActivate.add(nextNodeInstance);

                                          // TODO update document content on context?

                                  }

                                  // assign our local list here so the post processor doesn't save a RouteNodeInstance in an intermediate state

                                 for (RouteNodeInstance nextNodeInstance : nextNodeInstances) {

                                         nodeInstance.addNextNodeInstance(nextNodeInstance);

                                 }

                          }

                          // deactive the current active node

                         nodeInstance.setComplete(true);

                         nodeInstance.setActive(false);

                         // active the nodes we're transitioning into

                         for (RouteNodeInstance nodeToActivate : nodesToActivate) {

                                 nodeToActivate.setActive(true);

                         }

                 } else {

                     nodeInstance.setComplete(false);

         }

                 saveNode(context, nodeInstance);

                 return new ProcessContext(nodeInstance.isComplete(), nodeInstance.getNextNodeInstances());

         }

         /**

          * Checks various assertions regarding the processing of the current node.

          * If this method returns true, then the node will not be processed.

          *

          * This method will throw an exception if it deems that the processing is in

          * a illegal state.

          */

         private boolean checkAssertions(RouteContext context) throws Exception {

                 if (context.getNodeInstance().isComplete()) {

                         if ( LOG.isDebugEnabled() ) {

                                 LOG.debug("The node has already been completed: " + context.getNodeInstance().getRouteNode().getRouteNodeName());

                         }

                         return true;

                 }

                 if (isRunawayProcessDetected(context.getEngineState())) {

 //                         TODO more info in message

                         throw new WorkflowException("Detected runaway process.");

                 }

                 return false;

         }

         /**

          * Invokes the transition and returns the next node instances to transition

          * to from the current node instance on the route context.

          *

          * This is a 3-step process:

          *

          * <pre>

          *  1) If the node instance already has next nodes, return those,

          *  2) otherwise, invoke the transition engine for the node, if the resulting node instances are not empty, return those,

          *  3) lastly, if our node is in a process and no next nodes were returned from it's transition engine, invoke the

          *     transition engine of the process node and return the resulting node instances.

          * </pre>

          */

         /*

          * private List invokeTransition(RouteContext context, RouteNodeInstance

          * nodeInstance, ProcessResult processResult, TransitionEngine

          * transitionEngine) throws Exception { List nextNodeInstances =

          * nodeInstance.getNextNodeInstances(); if (nextNodeInstances.isEmpty()) {

          * Transition result = transitionEngine.transitionFrom(context,

          * processResult); nextNodeInstances = result.getNextNodeInstances(); if

          * (nextNodeInstances.isEmpty() && nodeInstance.isInProcess()) {

          * transitionEngine =

          * TransitionEngineFactory.createTransitionEngine(nodeInstance.getProcess());

          * nextNodeInstances = invokeTransition(context, nodeInstance.getProcess(),

          * processResult, transitionEngine); } } return nextNodeInstances; }

          */

         private List invokeTransition(RouteContext context, RouteNodeInstance nodeInstance, ProcessResult processResult, TransitionEngine transitionEngine) throws Exception {

                 List nextNodeInstances = nodeInstance.getNextNodeInstances();

                 if (nextNodeInstances.isEmpty()) {

                         Transition result = transitionEngine.transitionFrom(context, processResult);

                         nextNodeInstances = result.getNextNodeInstances();

                         if (nextNodeInstances.isEmpty() && nodeInstance.isInProcess()) {

                                 transitionEngine = TransitionEngineFactory.createTransitionEngine(nodeInstance.getProcess());

                                 context.setNodeInstance(nodeInstance);

                                 nextNodeInstances = invokeTransition(context, nodeInstance.getProcess(), processResult, transitionEngine);

                         }

                 }

                 return nextNodeInstances;

         }

         /*

          * private List invokeTransition(RouteContext context, RouteNodeInstance

          * process, ProcessResult processResult) throws Exception {

          * RouteNodeInstance nodeInstance = (context.getNodeInstance() ; List

          * nextNodeInstances = nodeInstance.getNextNodeInstances(); if

          * (nextNodeInstances.isEmpty()) { TransitionEngine transitionEngine =

          * TransitionEngineFactory.createTransitionEngine(nodeInstance); Transition

          * result = transitionEngine.transitionFrom(context, processResult);

          * nextNodeInstances = result.getNextNodeInstances(); if

          * (nextNodeInstances.isEmpty() && nodeInstance.isInProcess()) {

          * transitionEngine =

          * TransitionEngineFactory.createTransitionEngine(nodeInstance.getProcess());

          * nextNodeInstances = invokeTransition(context, nodeInstance.getProcess(),

          * processResult, transitionEngine); } } return nextNodeInstances; }

          *

          */private void notifyNodeChange(RouteContext context, RouteNodeInstance nextNodeInstance) throws Exception {

                 if (!context.isSimulation()) {

                         RouteNodeInstance nodeInstance = context.getNodeInstance();

                         // if application document status transition has been defined, update the status

                         String nextStatus = nodeInstance.getRouteNode().getNextDocStatus();

                         if (nextStatus != null && nextStatus.length() > 0){

                                 context.getDocument().updateAppDocStatus(nextStatus);

                         }

                         DocumentRouteLevelChange event = new DocumentRouteLevelChange(context.getDocument().getDocumentId(), context.getDocument().getAppDocId(), CompatUtils.getLevelForNode(context.getDocument().getDocumentType(), context.getNodeInstance()

                                         .getRouteNode().getRouteNodeName()), CompatUtils.getLevelForNode(context.getDocument().getDocumentType(), nextNodeInstance.getRouteNode().getRouteNodeName()), nodeInstance.getRouteNode().getRouteNodeName(), nextNodeInstance

                                         .getRouteNode().getRouteNodeName(), nodeInstance.getRouteNodeInstanceId(), nextNodeInstance.getRouteNodeInstanceId());

                         context.setDocument(notifyPostProcessor(context.getDocument(), nodeInstance, event));

                 }

         }

         private void handleBackwardCompatibility(RouteContext context, RouteNodeInstance nextNodeInstance) {

                 context.getDocument().setDocRouteLevel(new Integer(context.getDocument().getDocRouteLevel().intValue() + 1)); // preserve

                                                                                                                                                                                                                                                 // route

                                                                                                                                                                                                                                                 // level

                                                                                                                                                                                                                                                 // concept

                                                                                                                                                                                                                                                 // if

                                                                                                                                                                                                                                                 // possible

                 saveDocument(context);

         }

         private void saveDocument(RouteContext context) {

                 if (!context.isSimulation()) {

                         getRouteHeaderService().saveRouteHeader(context.getDocument());

                 }

         }

         private void saveBranch(RouteContext context, Branch branch) {

                 if (!context.isSimulation()) {

                         KEWServiceLocator.getRouteNodeService().save(branch);

                 }

         }

         protected void saveNode(RouteContext context, RouteNodeInstance nodeInstance) {

                 if (!context.isSimulation()) {

                         getRouteNodeService().save(nodeInstance);

                 } else {

                         // if we are in simulation mode, lets go ahead and assign some id

                         // values to our beans

                         for (Iterator<RouteNodeInstance> iterator = nodeInstance.getNextNodeInstances().iterator(); iterator.hasNext();) {

                                 RouteNodeInstance routeNodeInstance = (RouteNodeInstance) iterator.next();

                                 if (routeNodeInstance.getRouteNodeInstanceId() == null) {

                                         routeNodeInstance.setRouteNodeInstanceId(context.getEngineState().getNextSimulationId());

                                 }

                         }

                         if (nodeInstance.getProcess() != null && nodeInstance.getProcess().getRouteNodeInstanceId() == null) {

                                 nodeInstance.getProcess().setRouteNodeInstanceId(context.getEngineState().getNextSimulationId());

                         }

                         if (nodeInstance.getBranch() != null && nodeInstance.getBranch().getBranchId() == null) {

                                 nodeInstance.getBranch().setBranchId(context.getEngineState().getNextSimulationId());

                         }

                 }

         }

         // TODO extract this into some sort of component which handles transitioning

         // document state

         protected DocumentRouteHeaderValue nodePostProcess(RouteContext context) throws InvalidActionTakenException {

                 DocumentRouteHeaderValue document = context.getDocument();

                 Collection<RouteNodeInstance> activeNodes = getRouteNodeService().getActiveNodeInstances(document.getDocumentId());

                 boolean moreNodes = false;

                 for (Iterator<RouteNodeInstance> iterator = activeNodes.iterator(); iterator.hasNext();) {

                         RouteNodeInstance nodeInstance = (RouteNodeInstance) iterator.next();

                         moreNodes = moreNodes || !nodeInstance.isComplete();

                 }

                 List pendingRequests = KEWServiceLocator.getActionRequestService().findPendingByDoc(document.getDocumentId());

                 boolean activeApproveRequests = false;

                 boolean activeAckRequests = false;

                 for (Iterator iterator = pendingRequests.iterator(); iterator.hasNext();) {

                         ActionRequestValue request = (ActionRequestValue) iterator.next();

                         activeApproveRequests = request.isApproveOrCompleteRequest() || activeApproveRequests;

                         activeAckRequests = request.isAcknowledgeRequest() || activeAckRequests;

                 }

                 // TODO is the logic for going processed still going to be valid?

                 if (!document.isProcessed() && (!moreNodes || !activeApproveRequests)) {

                         if ( LOG.isDebugEnabled() ) {

                                 LOG.debug("No more nodes for this document " + document.getDocumentId());

                         }

                         // TODO perhaps the policies could also be factored out?

                         checkDefaultApprovalPolicy(document);

                         LOG.debug("Marking document processed");

                         DocumentRouteStatusChange event = new DocumentRouteStatusChange(document.getDocumentId(), document.getAppDocId(), document.getDocRouteStatus(), KEWConstants.ROUTE_HEADER_PROCESSED_CD);

                         document.markDocumentProcessed();

                         // saveDocument(context);

                         notifyPostProcessor(context, event);

                 }

                 // if document is processed and no pending action requests put the

                 // document into the finalized state.

                 if (document.isProcessed()) {

                         DocumentRouteStatusChange event = new DocumentRouteStatusChange(document.getDocumentId(), document.getAppDocId(), document.getDocRouteStatus(), KEWConstants.ROUTE_HEADER_FINAL_CD);

                         List actionRequests = KEWServiceLocator.getActionRequestService().findPendingByDoc(document.getDocumentId());

                         if (actionRequests.isEmpty()) {

                                 document.markDocumentFinalized();

                                 // saveDocument(context);

                                 notifyPostProcessor(context, event);

                         } else {

                                 boolean markFinalized = true;

                                 for (Iterator iter = actionRequests.iterator(); iter.hasNext();) {

                                         ActionRequestValue actionRequest = (ActionRequestValue) iter.next();

                                         if (KEWConstants.ACTION_REQUEST_ACKNOWLEDGE_REQ.equals(actionRequest.getActionRequested())) {

                                                 markFinalized = false;

                                         }

                                 }

                                 if (markFinalized) {

                                         document.markDocumentFinalized();

                                         // saveDocument(context);

                                         this.notifyPostProcessor(context, event);

                                 }

                         }

                 }

                 saveDocument(context);

                 return document;

         }

         /**

          * Check the default approval policy for the document. If the default

          * approval policy is no and no approval action requests have been created

          * then throw an execption so that the document will get thrown into

          * exception routing.

          *

          * @param rh

          *            route header to be checked

          * @param docType

          *            docType of the routeHeader to be checked.

          * @throws RouteManagerException

          */

         private void checkDefaultApprovalPolicy(DocumentRouteHeaderValue document) throws RouteManagerException {

                 if (!document.getDocumentType().getDefaultApprovePolicy().getPolicyValue().booleanValue()) {

                         LOG.debug("Checking if any requests have been generated for the document");

                         List requests = KEWServiceLocator.getActionRequestService().findAllActionRequestsByDocumentId(document.getDocumentId());

                         boolean approved = false;

                         for (Iterator iter = requests.iterator(); iter.hasNext();) {

                                 ActionRequestValue actionRequest = (ActionRequestValue) iter.next();

                                 if (actionRequest.isApproveOrCompleteRequest() && actionRequest.isDone()) { // &&

                                                                                                                                                                                         // !(actionRequest.getRouteMethodName().equals(KEWConstants.ADHOC_ROUTE_MODULE_NAME)

                                                                                                                                                                                         // &&

                                                                                                                                                                                         // actionRequest.isReviewerUser()

                                                                                                                                                                                         // &&

                                                                                                                                                                                         // document.getInitiatorWorkflowId().equals(actionRequest.getWorkflowId())))

                                                                                                                                                                                         // {

                                         LOG.debug("Found at least one processed approve request so document can be approved");

                                         approved = true;

                                         break;

                                 }

                         }

                         if (!approved) {

                                 LOG.debug("Document requires at least one request and none are present");

                                 // TODO what route method name to pass to this?

                                 throw new RouteManagerException("Document should have generated at least one approval request.");

                         }

                 }

         }

         private DocumentRouteHeaderValue notifyPostProcessor(RouteContext context, DocumentRouteStatusChange event) {

                 DocumentRouteHeaderValue document = context.getDocument();

                 if (context.isSimulation()) {

                         return document;

                 }

                 if (hasContactedPostProcessor(context, event)) {

                         return document;

                 }

                 String documentId = event.getDocumentId();

                 PerformanceLogger performanceLogger = new PerformanceLogger(documentId);

                 ProcessDocReport processReport = null;

                 PostProcessor postProc = null;

         try {

             // use the document's post processor unless specified by the runPostProcessorLogic not to

             if (!isRunPostProcessorLogic()) {

                 postProc = new DefaultPostProcessor();

             } else {

                 postProc = document.getDocumentType().getPostProcessor();

             }

         } catch (Exception e) {

             LOG.error("Error retrieving PostProcessor for document " + document.getDocumentId(), e);

             throw new RouteManagerException("Error retrieving PostProcessor for document " + document.getDocumentId(), e);

         }

                 try {

                         processReport = postProc.doRouteStatusChange(event);

                 } catch (Exception e) {

                         LOG.error("Error notifying post processor", e);

                         throw new RouteManagerException(KEWConstants.POST_PROCESSOR_FAILURE_MESSAGE, e);

                 } finally {

                         performanceLogger.log("Time to notifyPostProcessor of event " + event.getDocumentEventCode() + ".");

                 }

                 if (!processReport.isSuccess()) {

                         LOG.warn("PostProcessor failed to process document: " + processReport.getMessage());

                         throw new RouteManagerException(KEWConstants.POST_PROCESSOR_FAILURE_MESSAGE + processReport.getMessage());

                 }

                 return document;

         }

         /**

          * Returns true if the post processor has already been contacted about a

          * PROCESSED or FINAL post processor change. If the post processor has not

          * been contacted, this method will record on the document that it has been.

          *

          * This is because, in certain cases, a document could end up in exception

          * routing after it has already gone PROCESSED or FINAL (i.e. on Mass Action

          * processing) and we don't want to re-contact the post processor in these

          * cases.

          */

         private boolean hasContactedPostProcessor(RouteContext context, DocumentRouteStatusChange event) {

                 // get the initial node instance, the root branch is where we will store

                 // the state

                 Branch rootBranch = context.getDocument().getRootBranch();

                 String key = null;

                 if (KEWConstants.ROUTE_HEADER_PROCESSED_CD.equals(event.getNewRouteStatus())) {

                         key = KEWConstants.POST_PROCESSOR_PROCESSED_KEY;

                 } else if (KEWConstants.ROUTE_HEADER_FINAL_CD.equals(event.getNewRouteStatus())) {

                         key = KEWConstants.POST_PROCESSOR_FINAL_KEY;

                 } else {

                         return false;

                 }

                 BranchState branchState = null;

                 if (rootBranch != null) {

                     branchState = rootBranch.getBranchState(key);

                 } else {

                     return false;

                 }

                 if (branchState == null) {

                         branchState = new BranchState();

                         branchState.setKey(key);

                         branchState.setValue("true");

                         rootBranch.addBranchState(branchState);

                         saveBranch(context, rootBranch);

                         return false;

                 }

                 return "true".equals(branchState.getValue());

         }

         /**

          * TODO in some cases, someone may modify the route header in the post

          * processor, if we don't save before and reload after we will get an

          * optimistic lock exception, we need to work on a better solution for this!

          * TODO get the routeContext in this method - it should be a better object

          * than the nodeInstance

          */

         private DocumentRouteHeaderValue notifyPostProcessor(DocumentRouteHeaderValue document, RouteNodeInstance nodeInstance, DocumentRouteLevelChange event) {

                 getRouteHeaderService().saveRouteHeader(document);

                 ProcessDocReport report = null;

                 try {

                 PostProcessor postProcessor = null;

                 // use the document's post processor unless specified by the runPostProcessorLogic not to

                 if (!isRunPostProcessorLogic()) {

                     postProcessor = new DefaultPostProcessor();

                 } else {

                     postProcessor = document.getDocumentType().getPostProcessor();

                 }

                         report = postProcessor.doRouteLevelChange(event);

                 } catch (Exception e) {

                         LOG.warn("Problems contacting PostProcessor", e);

                         throw new RouteManagerException("Problems contacting PostProcessor:  " + e.getMessage());

                 }

                 document = getRouteHeaderService().getRouteHeader(document.getDocumentId());

                 if (!report.isSuccess()) {

                         LOG.error("PostProcessor rejected route level change::" + report.getMessage(), report.getProcessException());

                         throw new RouteManagerException("Route Level change failed in post processor::" + report.getMessage());

                 }

                 return document;

         }

     /**

      * TODO get the routeContext in this method - it should be a better object

      * than the nodeInstance

      */

         private DocumentRouteHeaderValue notifyPostProcessorBeforeProcess(DocumentRouteHeaderValue document, String nodeInstanceId) {

             return notifyPostProcessorBeforeProcess(document, nodeInstanceId, new BeforeProcessEvent(document.getDocumentId(),document.getAppDocId(),nodeInstanceId));

         }

     /**

      * TODO get the routeContext in this method - it should be a better object

      * than the nodeInstance

      */

     private DocumentRouteHeaderValue notifyPostProcessorBeforeProcess(DocumentRouteHeaderValue document, String nodeInstanceId, BeforeProcessEvent event) {

         ProcessDocReport report = null;

         try {

             PostProcessor postProcessor = null;

             // use the document's post processor unless specified by the runPostProcessorLogic not to

             if (!isRunPostProcessorLogic()) {

                 postProcessor = new DefaultPostProcessor();

             } else {

                 postProcessor = document.getDocumentType().getPostProcessor();

             }

             report = postProcessor.beforeProcess(event);

         } catch (Exception e) {

             LOG.warn("Problems contacting PostProcessor", e);

             throw new RouteManagerException("Problems contacting PostProcessor:  " + e.getMessage());

         }

         document = getRouteHeaderService().getRouteHeader(document.getDocumentId());

         if (!report.isSuccess()) {

             LOG.error("PostProcessor rejected route level change::" + report.getMessage(), report.getProcessException());

             throw new RouteManagerException("Route Level change failed in post processor::" + report.getMessage());

         }

         return document;

     }

     protected void lockAdditionalDocuments(DocumentRouteHeaderValue document) throws Exception {

                 DocumentLockingEvent lockingEvent = new DocumentLockingEvent(document.getDocumentId(), document.getAppDocId());

                 // TODO this shows up in a few places and could totally be extracted to a method

                 PostProcessor postProcessor = null;

         // use the document's post processor unless specified by the runPostProcessorLogic not to

         if (!isRunPostProcessorLogic()) {

             postProcessor = new DefaultPostProcessor();

         } else {

             postProcessor = document.getDocumentType().getPostProcessor();

         }

         List<String> documentIdsToLock = postProcessor.getDocumentIdsToLock(lockingEvent);

         if (documentIdsToLock != null && !documentIdsToLock.isEmpty()) {

                 for (String documentId : documentIdsToLock) {

                         if ( LOG.isInfoEnabled() ) {

                                     LOG.info("Aquiring additional lock on document " + documentId);

                             }

                         getRouteHeaderService().lockRouteHeader(documentId, true);

                         if ( LOG.isInfoEnabled() ) {

                                 LOG.info("Aquired lock on document " + documentId);

                         }

                 }

         }

         }

     /**

      * TODO get the routeContext in this method - it should be a better object

      * than the nodeInstance

      */

     private DocumentRouteHeaderValue notifyPostProcessorAfterProcess(DocumentRouteHeaderValue document, String nodeInstanceId, boolean successfullyProcessed) {

             if (document == null) {

                     // this could happen if we failed to acquire the lock on the document

                     return null;

             }

         return notifyPostProcessorAfterProcess(document, nodeInstanceId, new AfterProcessEvent(document.getDocumentId(),document.getAppDocId(),nodeInstanceId,successfullyProcessed));

     }

     /**

      * TODO get the routeContext in this method - it should be a better object

      * than the nodeInstance

      */

     private DocumentRouteHeaderValue notifyPostProcessorAfterProcess(DocumentRouteHeaderValue document, String nodeInstanceId, AfterProcessEvent event) {

         ProcessDocReport report = null;

         try {

             PostProcessor postProcessor = null;

             // use the document's post processor unless specified by the runPostProcessorLogic not to

             if (!isRunPostProcessorLogic()) {

                 postProcessor = new DefaultPostProcessor();

             } else {

                 postProcessor = document.getDocumentType().getPostProcessor();

             }

             report = postProcessor.afterProcess(event);

         } catch (Exception e) {

             LOG.warn("Problems contacting PostProcessor", e);

             throw new RouteManagerException("Problems contacting PostProcessor:  " + e.getMessage());

         }

         document = getRouteHeaderService().getRouteHeader(document.getDocumentId());

         if (!report.isSuccess()) {

             LOG.error("PostProcessor rejected route level change::" + report.getMessage(), report.getProcessException());

             throw new RouteManagerException("Route Level change failed in post processor::" + report.getMessage());

         }

         return document;

     }

         /**

          * This method initializes the document by materializing and activating the

          * first node instance on the document.

          */

         public void initializeDocument(DocumentRouteHeaderValue document) {

                 // we set up a local route context here just so that we are able to

                 // utilize the saveNode method at the end of

                 // this method. Incidentally, this was changed from pulling the existing

                 // context out because it would override

                 // the document in the route context in the case of a document being

                 // initialized for reporting purposes.

                 RouteContext context = new RouteContext();

                 context.setDocument(document);

                 if (context.getEngineState() == null) {

                         context.setEngineState(new EngineState());

                 }

                 Process process = document.getDocumentType().getPrimaryProcess();

                 if (process == null || process.getInitialRouteNode() == null) {

                     if (process == null) {

                         throw new IllegalDocumentTypeException("DocumentType '" + document.getDocumentType().getName() + "' has no primary process configured!");

                     }

                         return;

                 }

                 RouteNodeInstance nodeInstance = helper.getNodeFactory().createRouteNodeInstance(document.getDocumentId(), process.getInitialRouteNode());

                 nodeInstance.setActive(true);

                 helper.getNodeFactory().createBranch(KEWConstants.PRIMARY_BRANCH_NAME, null, nodeInstance);

                 document.getInitialRouteNodeInstances().add(nodeInstance);

                 saveNode(context, nodeInstance);

         }

     private boolean isRunawayProcessDetected(EngineState engineState) throws NumberFormatException {

             String maxNodesConstant = getParameterService().getParameterValueAsString(KEWConstants.KEW_NAMESPACE, KRADConstants.DetailTypes.ALL_DETAIL_TYPE, KEWConstants.MAX_NODES_BEFORE_RUNAWAY_PROCESS);

             int maxNodes = (org.apache.commons.lang.StringUtils.isEmpty(maxNodesConstant)) ? 50 : Integer.valueOf(maxNodesConstant);

             return engineState.getCompleteNodeInstances().size() > maxNodes;

         }

     protected RouteNodeService getRouteNodeService() {

                 return routeNodeService;

         }

         protected RouteHeaderService getRouteHeaderService() {

                 return routeHeaderService;

         }

     protected ParameterService getParameterService() {

                 return parameterService;

         }

 //    public void setRouteNodeService(RouteNodeService routeNodeService) {

 //        this.routeNodeService = routeNodeService;

 //    }

 //

 //    public void setRouteHeaderService(RouteHeaderService routeHeaderService) {

 //        this.routeHeaderService = routeHeaderService;

 //    }

 //

 //    public void setParameterService(ParameterService parameterService) {

 //        this.parameterService = parameterService;

 //    }

 }