bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/service/impl/VirtualGraphInitializer.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.layer0.service.impl;\r
  13 \r
  14 import java.io.IOException;\r
  15 import java.io.InputStream;\r
  16 import java.net.URL;\r
  17 import java.util.Enumeration;\r
  18 import java.util.UUID;\r
  19 \r
  20 import org.eclipse.core.runtime.IStatus;\r
  21 import org.eclipse.core.runtime.MultiStatus;\r
  22 import org.eclipse.core.runtime.Status;\r
  23 import org.osgi.framework.Bundle;\r
  24 import org.osgi.framework.BundleContext;\r
  25 import org.simantics.databoard.Bindings;\r
  26 import org.simantics.databoard.Datatypes;\r
  27 import org.simantics.databoard.serialization.Serializer;\r
  28 import org.simantics.databoard.type.Datatype;\r
  29 import org.simantics.db.Session;\r
  30 import org.simantics.db.VirtualGraph;\r
  31 import org.simantics.db.exception.DatabaseException;\r
  32 import org.simantics.db.layer0.internal.Activator;\r
  33 import org.simantics.db.service.VirtualGraphSupport;\r
  34 import org.simantics.db.services.ServiceInitializer;\r
  35 import org.simantics.graph.db.ImportAdvisor;\r
  36 import org.simantics.graph.db.TransferableGraphs;\r
  37 import org.simantics.graph.representation.TransferableGraph1;\r
  38 \r
  39 /**\r
  40  * A database client service initializer which ensures that any <code>.tg</code>\r
  41  * files defined in a bundle folder <code>virtualgraphs</code> are imported into\r
  42  * randomly named in-memory virtualgraphs for the initialized session.\r
  43  * \r
  44  * @author Antti Villberg\r
  45  */\r
  46 public class VirtualGraphInitializer implements ServiceInitializer {\r
  47 \r
  48         @Override\r
  49         public IStatus initialize(Session s) {\r
  50                 MultiStatus result = new MultiStatus(Activator.PLUGIN_ID, 0, "VirtualGraphInitialize errors:", null);\r
  51                 BundleContext context = Activator.getInstance().getContext();\r
  52                 Serializer datatypeSerializer = Bindings.getSerializerUnchecked( Datatype.class );\r
  53                 Datatype tgType = Datatypes.getDatatypeUnchecked(TransferableGraph1.class);\r
  54                 Serializer tgSerializer = Bindings.getSerializerUnchecked( TransferableGraph1.class );\r
  55                 for (final Bundle b : context.getBundles()) {\r
  56                         Enumeration<?> graphs = b.getEntryPaths("virtualgraphs");\r
  57                         while(graphs != null && graphs.hasMoreElements()) {\r
  58                                 String element = (String)graphs.nextElement();\r
  59                                 if(!element.endsWith(".tg"))\r
  60                                         continue;\r
  61                                 URL url = b.getEntry(element);\r
  62                                 try {\r
  63                                         InputStream stream = url.openStream();\r
  64                                         Datatype dt = (Datatype) datatypeSerializer.deserialize( stream );\r
  65                                         if(dt.equals(tgType)) {\r
  66                                                 VirtualGraphSupport support = s.getService(VirtualGraphSupport.class);\r
  67                                                 VirtualGraph vg = support.getMemoryPersistent(UUID.randomUUID().toString());\r
  68                                                 TransferableGraph1 tg = (TransferableGraph1) tgSerializer.deserialize(stream);\r
  69                                                 TransferableGraphs.importVirtualGraph(s, vg, tg, \r
  70                                                                 new ImportAdvisor());\r
  71                                         }\r
  72                                         stream.close();\r
  73                                 } catch (IOException e) {\r
  74                                         IStatus status = new Status(IStatus.ERROR, context.getBundle().getSymbolicName(), "VirtualGraphInitializer transferable graph initialization failed for '" + url.toString() + "', see exception for details.", e);\r
  75                                         result.add(status);\r
  76                                 } catch (DatabaseException e) {\r
  77                                         IStatus status = new Status(IStatus.ERROR, context.getBundle().getSymbolicName(), "VirtualGraphInitializer transferable graph initialization failed for '" + url.toString() + "', see exception for details.", e);\r
  78                                         result.add(status);\r
  79                                 }\r
  80                         }\r
  81                 }\r
  82                 if (!result.isOK()) return result;\r
  83                 return Status.OK_STATUS;\r
  84         }\r
  85 \r
  86 }\r