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

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