bundles/org.simantics.db.common/src/org/simantics/db/common/request/ObjectsWithTypeAsync.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.Collection;
  15 import java.util.Set;
  16 import java.util.concurrent.ConcurrentLinkedQueue;
  17
  18 import org.simantics.db.AsyncReadGraph;
  19 import org.simantics.db.Resource;
  20 import org.simantics.db.common.ProcedureBarrier;
  21 import org.simantics.db.common.utils.Logger;
  22 import org.simantics.db.procedure.AsyncMultiProcedure;
  23 import org.simantics.db.procedure.AsyncProcedure;
  24
  25 final public class ObjectsWithTypeAsync extends ResourceAsyncRead3<Collection<Resource>> {
  26
  27     public ObjectsWithTypeAsync(Resource subject, Resource subrelationOf, Resource instanceOf) {
  28         super(subject, subrelationOf, instanceOf);
  29     }
  30
  31     @Override
  32     public void perform(AsyncReadGraph graph, final AsyncProcedure<Collection<Resource>> procedure) {
  33
  34         final Collection<Resource> result = new ConcurrentLinkedQueue<Resource>();
  35         final ProcedureBarrier<Collection<Resource>> ready = new ProcedureBarrier<Collection<Resource>>(1);
  36
  37         graph.forEachObject(resource, resource2, new AsyncMultiProcedure<Resource>() {
  38
  39                         @Override
  40                         public void execute(AsyncReadGraph graph, final Resource object) {
  41
  42                                 ready.incrementAndGet();
  43
  44                                 graph.forTypes(object, new AsyncProcedure<Set<Resource>>() {
  45
  46                                         @Override
  47                                         public void execute(AsyncReadGraph graph, Set<Resource> types) {
  48
  49                                                 if(types.contains(resource3)) {
  50                                                         result.add(object);
  51                                                 }
  52
  53                                                 ready.dec(graph, procedure, result);
  54
  55                                         }
  56
  57                                         @Override
  58                                         public void exception(AsyncReadGraph graph, Throwable throwable) {
  59
  60                                                 throwable.printStackTrace();
  61                                         Logger.defaultLogError(throwable);
  62
  63                                                 ready.except(throwable);
  64                                                 ready.dec(graph, procedure, result);
  65
  66                                         }
  67
  68                                 });
  69
  70                         }
  71
  72                         @Override
  73                         public void finished(AsyncReadGraph graph) {
  74
  75                                 ready.dec(graph, procedure, result);
  76
  77                         }
  78
  79                         @Override
  80                         public void exception(AsyncReadGraph graph, Throwable throwable) {
  81
  82                                 throwable.printStackTrace();
  83                         Logger.defaultLogError(throwable);
  84
  85                                 ready.except(throwable);
  86                                 ready.dec(graph, procedure, result);
  87
  88                         }
  89
  90         });
  91
  92     }
  93
  94 //    @Override
  95 //    public Collection<Resource> perform(ReadGraph graph) throws DatabaseException {
  96 //
  97 //      Set<Resource> result = new HashSet<Resource>();
  98 //      for(Resource object : graph.getObjects(resource, resource2)) {
  99 //              if(graph.isInstanceOf(object, resource3)) result.add(object);
 100 //      }
 101 //      return result;
 102 //
 103 //    }
 104
 105 }