bundles/org.simantics.db.common/src/org/simantics/db/common/request/AsyncMappedParts.java

   1 /*******************************************************************************
   2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management
   3  * in Industry THTH ry.
   4  * All rights reserved. This program and the accompanying materials
   5  * are made available under the terms of the Eclipse Public License v1.0
   6  * which accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *     VTT Technical Research Centre of Finland - initial API and implementation
  11  *******************************************************************************/
  12 package org.simantics.db.common.request;
  13
  14 import java.util.Map;
  15 import java.util.concurrent.ConcurrentHashMap;
  16 import java.util.concurrent.atomic.AtomicInteger;
  17
  18 import org.simantics.db.AsyncReadGraph;
  19 import org.simantics.db.Resource;
  20 import org.simantics.db.common.procedure.adapter.AsyncMultiProcedureAdapter;
  21 import org.simantics.db.common.procedure.adapter.AsyncProcedureAdapter;
  22 import org.simantics.db.procedure.AsyncProcedure;
  23 import org.simantics.layer0.Layer0;
  24 import org.simantics.operation.Layer0X;
  25
  26 /**
  27  * Asynchronous version of {@link MappedParts}.
  28  *
  29  * @author Tuukka Lehtonen
  30  */
  31 public class AsyncMappedParts extends ResourceAsyncRead<Map<Resource, Resource>> {
  32
  33     public AsyncMappedParts(Resource flat) {
  34         super(flat);
  35     }
  36
  37     @Override
  38     public void perform(AsyncReadGraph graph, final AsyncProcedure<Map<Resource, Resource>> procedure) {
  39
  40         final AtomicInteger done = new AtomicInteger(1);
  41         final Layer0 l0 = graph.getService(Layer0.class);
  42         final Layer0X L0X = graph.getService(Layer0X.class);
  43         final Map<Resource, Resource> result = new ConcurrentHashMap<Resource, Resource>();
  44
  45         graph.forEachObject(resource, l0.ConsistsOf, new AsyncMultiProcedureAdapter<Resource>() {
  46             @Override
  47             public void execute(AsyncReadGraph graph, final Resource part) {
  48                 done.incrementAndGet();
  49                 graph.forPossibleObject(part, L0X.Represents, new AsyncProcedureAdapter<Resource>() {
  50                     @Override
  51                     public void execute(AsyncReadGraph graph, Resource represents) {
  52                         if (represents != null)
  53                             result.put(represents, part);
  54                         if(done.decrementAndGet() == 0) {
  55                             procedure.execute(graph, result);
  56                         }
  57                     }
  58                 });
  59             }
  60             @Override
  61             public void exception(AsyncReadGraph graph, Throwable t) {
  62                 procedure.exception(graph, t);
  63             }
  64             @Override
  65             public void finished(AsyncReadGraph graph) {
  66                 if(done.decrementAndGet() == 0) {
  67                     procedure.execute(graph, result);
  68                 }
  69             }
  70         });
  71     }
  72
  73 }