runtime/org.argeo.slc.repo/src/main/java/org/argeo/slc/repo/RepoIndexer.java

   1 /*
   2  * Copyright (C) 2007-2012 Argeo GmbH
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *         http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package org.argeo.slc.repo;
  17
  18 import java.util.ArrayList;
  19 import java.util.List;
  20
  21 import javax.jcr.Node;
  22 import javax.jcr.Repository;
  23 import javax.jcr.RepositoryException;
  24 import javax.jcr.Session;
  25 import javax.jcr.observation.Event;
  26 import javax.jcr.observation.EventIterator;
  27 import javax.jcr.observation.EventListener;
  28
  29 import org.argeo.jcr.JcrUtils;
  30 import org.argeo.slc.SlcException;
  31
  32 /** Repository backend, maintain the JCR repository, mainly through listeners */
  33 public class RepoIndexer {
  34
  35         private Repository jcrRepository;
  36         private String workspace = null;
  37
  38         // Internal
  39         private Session adminSession;
  40         private FilesListener artifactListener;
  41
  42         /** order may be important */
  43         private List<NodeIndexer> nodeIndexers = new ArrayList<NodeIndexer>();
  44
  45         public void init() {
  46                 try {
  47                         adminSession = jcrRepository.login(workspace);
  48                         artifactListener = new FilesListener();
  49                         adminSession
  50                                         .getWorkspace()
  51                                         .getObservationManager()
  52                                         .addEventListener(artifactListener, Event.NODE_ADDED, "/",
  53                                                         true, null, null, true);
  54                 } catch (RepositoryException e) {
  55                         throw new SlcException("Cannot initialize repository backend", e);
  56                 }
  57         }
  58
  59         public void destroy() {
  60                 JcrUtils.logoutQuietly(adminSession);
  61         }
  62
  63         public void setJcrRepository(Repository jcrRepository) {
  64                 this.jcrRepository = jcrRepository;
  65         }
  66
  67         public void setNodeIndexers(List<NodeIndexer> nodeIndexers) {
  68                 this.nodeIndexers = nodeIndexers;
  69         }
  70
  71         public void setWorkspace(String workspace) {
  72                 this.workspace = workspace;
  73         }
  74
  75         class FilesListener implements EventListener {
  76
  77                 public void onEvent(EventIterator events) {
  78                         while (events.hasNext()) {
  79                                 Event event = events.nextEvent();
  80                                 try {
  81                                         String newNodePath = event.getPath();
  82                                         Node newNode = null;
  83                                         for (NodeIndexer nodeIndexer : nodeIndexers) {
  84                                                 try {
  85                                                         if (nodeIndexer.support(newNodePath)) {
  86                                                                 if (newNode == null)
  87                                                                         newNode = adminSession.getNode(newNodePath);
  88                                                                 nodeIndexer.index(newNode);
  89                                                         }
  90                                                 } catch (RuntimeException e) {
  91                                                         e.printStackTrace();
  92                                                         throw e;
  93                                                 }
  94                                         }
  95                                         if (newNode != null)
  96                                                 adminSession.save();
  97                                 } catch (RepositoryException e) {
  98                                         throw new SlcException("Cannot process event " + event, e);
  99                                 } finally {
 100                                         JcrUtils.discardQuietly(adminSession);
 101                                 }
 102                         }
 103
 104                 }
 105
 106         }
 107
 108 }