/*

  * Copyright 2005-2008 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.actionrequest.service.impl;

 import java.util.ArrayList;

 import java.util.Collection;

 import java.util.Iterator;

 import java.util.List;

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

 import org.kuali.rice.kew.actionrequest.service.ActionRequestService;

 import org.kuali.rice.kew.actionrequest.service.DocumentRequeuerService;

 import org.kuali.rice.kew.api.WorkflowRuntimeException;

 import org.kuali.rice.kew.engine.RouteHelper;

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

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

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

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

 /**

  * A service which effectively "refreshes" and requeues a document.  It first deletes any

  * pending action requests on the documents and then requeues the document for standard routing.

  * Addionally, it adds duplicate notification suppression state to RouteNodeInstanceS for 

  * which ActionRequestS will be regenerated. 

  * 

  * Intended to be called async and wired that way in server/client spring beans.

  * 

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

  */

 public class DocumentRequeuerImpl implements DocumentRequeuerService {

         private RouteHelper helper = new RouteHelper();

         /**

          * Requeues a document, and sets notification suppression data

          * 

          * @see org.kuali.rice.kew.actionrequest.service.DocumentRequeuerService#requeueDocument(java.lang.Long)

          */

         @SuppressWarnings("unchecked")

         public void requeueDocument(String documentId) {

                 PerformanceLogger performanceLogger = new PerformanceLogger();

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

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

         List<ActionRequestValue> requestsToDelete = new ArrayList<ActionRequestValue>();

                 NotificationSuppression notificationSuppression = new NotificationSuppression();

         for (RouteNodeInstance nodeInstance : activeNodes) {

             // only "requeue" if we're dealing with a request activation node

             if (helper.isRequestActivationNode(nodeInstance.getRouteNode())) {

                     List<ActionRequestValue> deletesForThisNode = 

                             getActionRequestService().findPendingRootRequestsByDocIdAtRouteNode(documentId, nodeInstance.getRouteNodeInstanceId());

                     for (ActionRequestValue deleteForThisNode : deletesForThisNode) {

                             // only delete the request if it was generated by a route module (or the rules system)

                             if (deleteForThisNode.isRouteModuleRequest()) {

                                     requestsToDelete.add(deleteForThisNode);

                                     // suppress duplicate notifications

                                     notificationSuppression.addNotificationSuppression(nodeInstance, deleteForThisNode);

                             }

                     }

                 // this will trigger a regeneration of requests

                 nodeInstance.setInitial(true);

                 getRouteNodeService().save(nodeInstance);

             }

         }

         for (ActionRequestValue requestToDelete : requestsToDelete) {

             getActionRequestService().deleteActionRequestGraph(requestToDelete);

         }

         try {

                 KEWServiceLocator.getWorkflowEngine().process(documentId, null);

         } catch (Exception e) {

                 throw new WorkflowRuntimeException(e);

         }

         performanceLogger.log("Time to run DocumentRequeuer for document " + documentId);        

         }

     private ActionRequestService getActionRequestService() {

         return KEWServiceLocator.getActionRequestService();

     }

     private RouteNodeService getRouteNodeService() {

         return KEWServiceLocator.getRouteNodeService();

     }

 }