]> gerrit.simantics Code Review - simantics/platform.git/blobdiff - bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/migration/MigrationStateImpl.java
Fixed migrating import temporary folder creation to prevent name overlap
[simantics/platform.git] / bundles / org.simantics.db.layer0 / src / org / simantics / db / layer0 / migration / MigrationStateImpl.java
index bfe5a73497768fc475188464404a84b27a84142b..d7f6b4e95497fe0a1ac0991cf27c38720f316681 100644 (file)
-/*******************************************************************************\r
- * Copyright (c) 2012 Association for Decentralized Information Management in\r
- * Industry THTH ry.\r
- * All rights reserved. This program and the accompanying materials\r
- * are made available under the terms of the Eclipse Public License v1.0\r
- * which accompanies this distribution, and is available at\r
- * http://www.eclipse.org/legal/epl-v10.html\r
- *\r
- * Contributors:\r
- *     VTT Technical Research Centre of Finland - initial API and implementation\r
- *******************************************************************************/\r
-package org.simantics.db.layer0.migration;\r
-\r
-import java.io.File;\r
-import java.io.IOException;\r
-import java.text.DateFormat;\r
-import java.util.ArrayList;\r
-import java.util.Collection;\r
-import java.util.Date;\r
-import java.util.HashMap;\r
-import java.util.Map;\r
-\r
-import org.eclipse.core.runtime.IProgressMonitor;\r
-import org.simantics.databoard.Bindings;\r
-import org.simantics.databoard.binding.mutable.Variant;\r
-import org.simantics.databoard.container.DataContainer;\r
-import org.simantics.db.ReadGraph;\r
-import org.simantics.db.Resource;\r
-import org.simantics.db.Session;\r
-import org.simantics.db.WriteGraph;\r
-import org.simantics.db.WriteOnlyGraph;\r
-import org.simantics.db.common.request.WriteResultRequest;\r
-import org.simantics.db.common.utils.Logger;\r
-import org.simantics.db.exception.AssumptionException;\r
-import org.simantics.db.exception.DatabaseException;\r
-import org.simantics.db.layer0.adapter.impl.DefaultPasteImportAdvisor;\r
-import org.simantics.db.layer0.internal.SimanticsInternal;\r
-import org.simantics.db.layer0.util.Layer0Utils;\r
-import org.simantics.db.layer0.util.ModelTransferableGraphSourceRequest;\r
-import org.simantics.db.layer0.util.TransferableGraphConfiguration2;\r
-import org.simantics.db.request.Read;\r
-import org.simantics.db.service.ManagementSupport;\r
-import org.simantics.db.service.SerialisationSupport;\r
-import org.simantics.graph.db.IImportAdvisor;\r
-import org.simantics.graph.db.IImportAdvisor2;\r
-import org.simantics.graph.db.StreamingTransferableGraphFileReader;\r
-import org.simantics.graph.db.TGStatusMonitor;\r
-import org.simantics.graph.db.TransferableGraphImporter;\r
-import org.simantics.graph.db.TransferableGraphSource;\r
-import org.simantics.graph.db.TransferableGraphs;\r
-import org.simantics.graph.db.WrapperAdvisor;\r
-import org.simantics.graph.representation.ByteFileReader;\r
-import org.simantics.graph.representation.TransferableGraph1;\r
-import org.simantics.graph.representation.TransferableGraphFileReader;\r
-import org.simantics.layer0.Layer0;\r
-\r
-public class MigrationStateImpl implements MigrationState {\r
-\r
-       final private HashMap<String, Object> properties = new HashMap<String, Object>();\r
-       \r
-    @SuppressWarnings("unchecked")\r
-    @Override\r
-    public <T> T probeProperty(String key) throws DatabaseException {\r
-        return (T)properties.get(key);\r
-    }\r
-\r
-       @SuppressWarnings("unchecked")\r
-    @Override\r
-       public <T> T getProperty(String key) throws DatabaseException {\r
-           \r
-           T property = (T)properties.get(key);\r
-           if(property != null) return property;\r
-           \r
-           if(MigrationStateKeys.BASE_URI.equals(key)) {\r
-               throw new IllegalStateException("Base URI needs to be supplied for migration.");\r
-        } else if (MigrationStateKeys.SESSION.equals(key)) {\r
-            throw new IllegalStateException("Session needs to be supplied for migration.");\r
-        } else if (MigrationStateKeys.MODEL_FILE.equals(key)) {\r
-            throw new IllegalStateException("Model file needs to be supplied for migration.");\r
-           } else if (MigrationStateKeys.CURRENT_TG.equals(key)) {\r
-               \r
-               final Resource resource = probeProperty(MigrationStateKeys.CURRENT_RESOURCE);\r
-               final Collection<Resource> roots = probeProperty(MigrationStateKeys.CURRENT_ROOT_RESOURCES);\r
-               if(roots != null) {\r
-                   Session session = getProperty(MigrationStateKeys.SESSION);\r
-                   TransferableGraph1 tg = session.syncRequest(new Read<TransferableGraph1>() {\r
-                       @Override\r
-                       public TransferableGraph1 perform(ReadGraph graph) throws DatabaseException {\r
-                           TransferableGraphConfiguration2 conf = new TransferableGraphConfiguration2(graph, roots, true, false);\r
-                           TransferableGraphSource source = graph.syncRequest(new ModelTransferableGraphSourceRequest(conf));\r
-                           return TransferableGraphs.create(graph, source);\r
-                       }\r
-                   });\r
-                   if (resource != null)\r
-                       MigrationUtils.clearTempResource(session, resource);\r
-                   setProperty(MigrationStateKeys.CURRENT_RESOURCE, null);\r
-                   setProperty(MigrationStateKeys.CURRENT_ROOT_RESOURCES, null);\r
-                setProperty(MigrationStateKeys.DATABASE_REVISION_AFTER_TG_IMPORT, null);\r
-                   setProperty(MigrationStateKeys.CURRENT_TG, tg);\r
-                   return (T)tg;\r
-               }\r
-               \r
-            TransferableGraphFileReader reader = null;\r
-            try {\r
-                File modelFile = getProperty(MigrationStateKeys.MODEL_FILE);\r
-                reader = new TransferableGraphFileReader(modelFile);\r
-                TransferableGraph1 tg = reader.readTG();\r
-                setProperty(MigrationStateKeys.CURRENT_TG, tg);\r
-                return (T)tg;\r
-            } catch (DatabaseException e) {\r
-                throw e;\r
-            } catch (Throwable t) {\r
-                throw new DatabaseException(t);\r
-            } finally {\r
-                uncheckedClose(reader);\r
-            }\r
-               \r
-        } else if (MigrationStateKeys.CURRENT_TGS.equals(key)) {\r
-\r
-            File modelFile = getProperty(MigrationStateKeys.MODEL_FILE);\r
-            \r
-            try {\r
-                StreamingTransferableGraphFileReader reader = new StreamingTransferableGraphFileReader(modelFile);\r
-                TransferableGraphSource tgs = reader.readTG();\r
-                setProperty(MigrationStateKeys.CURRENT_TGS_READER, reader);\r
-                setProperty(MigrationStateKeys.CURRENT_TGS, tgs);\r
-                return (T)tgs;\r
-            } catch (DatabaseException e) {\r
-                throw e;\r
-            } catch (IOException e) {\r
-               throw new DatabaseException("An I/O exception occurred during reading '" + modelFile.getAbsolutePath() + "'", e);\r
-            } catch (Throwable t) {\r
-                throw new DatabaseException(t);\r
-            }\r
-\r
-        } else if (MigrationStateKeys.CURRENT_DATA_CONTAINER.equals(key)) {\r
-            \r
-            try {\r
-                \r
-                TransferableGraphSource tgs = getProperty(MigrationStateKeys.CURRENT_TGS);\r
-                DataContainer dc = tgs.getHeader();\r
-                setProperty(MigrationStateKeys.CURRENT_DATA_CONTAINER, dc);\r
-                return (T)dc;\r
-                \r
-            } catch (DatabaseException e) {\r
-                throw e;\r
-            } catch (Throwable t) {\r
-                throw new DatabaseException(t);\r
-            }\r
-            \r
-        } else if (MigrationStateKeys.TG_EXTENSIONS.equals(key)) {\r
-            \r
-            try {\r
-                \r
-                TransferableGraphSource tgs = getProperty(MigrationStateKeys.CURRENT_TGS);\r
-                Map<String,Variant> extensions = tgs.getExtensions();\r
-                setProperty(MigrationStateKeys.TG_EXTENSIONS, extensions);\r
-                return (T)extensions;\r
-                \r
-            } catch (DatabaseException e) {\r
-                throw e;\r
-            } catch (Throwable t) {\r
-                throw new DatabaseException(t);\r
-            }\r
-\r
-        } else if (MigrationStateKeys.CURRENT_RESOURCE.equals(key) || MigrationStateKeys.CURRENT_ROOT_RESOURCES.equals(key)) {\r
-            \r
-            final Session session = getProperty(MigrationStateKeys.SESSION);\r
-            final IProgressMonitor monitor = probeProperty(MigrationStateKeys.PROGRESS_MONITOR);\r
-            final boolean updateDependencies = MigrationUtils.getProperty(this, MigrationStateKeys.UPDATE_DEPENDENCIES, Boolean.TRUE);\r
-            \r
-            final TransferableGraph1 tg = probeProperty(MigrationStateKeys.CURRENT_TG);\r
-            if(tg != null) {\r
-               \r
-                final Resource indexRoot = session.syncRequest(new WriteResultRequest<Resource>() {\r
-                    @Override\r
-                    public Resource perform(WriteGraph graph) throws DatabaseException {\r
-                        if(!updateDependencies)\r
-                            Layer0Utils.setDependenciesIndexingDisabled(graph, true);\r
-                        return createTemporaryRoot(graph);\r
-                    }\r
-                });\r
-\r
-                IImportAdvisor baseAdvisor = MigrationUtils.getProperty(this, MigrationStateKeys.IMPORT_ADVISOR, new DefaultPasteImportAdvisor(indexRoot));\r
-                IImportAdvisor2 advisor = new WrapperAdvisor(baseAdvisor) {\r
-                       @Override\r
-                    public void beforeWrite(WriteOnlyGraph graph, TransferableGraphImporter process) throws DatabaseException {\r
-                       super.beforeWrite(graph, process);\r
-                        if(!updateDependencies)\r
-                            Layer0Utils.setDependenciesIndexingDisabled(graph, true);\r
-                    }\r
-                       @Override\r
-                    public void afterWrite(WriteOnlyGraph graph, TransferableGraphImporter process) throws DatabaseException {\r
-                       super.afterWrite(graph, process);\r
-                       Boolean storeResources = probeProperty(MigrationStateKeys.GET_RESOURCE_IDS);\r
-                       if(storeResources != null && storeResources) {\r
-                               long[] ids = process.getResourceIds(session.getService(SerialisationSupport.class));\r
-                               setProperty(MigrationStateKeys.RESOURCE_IDS, ids);\r
-                       }\r
-                    }\r
-                               };\r
-                               // Make sure that the supplied advisor is redirected to temp\r
-                               advisor.redirect(indexRoot);\r
-                \r
-                TransferableGraphs.importGraph1WithMonitor(session, tg, advisor, new TGStatusMonitor() {\r
-                    @Override\r
-                    public void status(int percentage) {\r
-                        monitor.subTask("Importing model from file (" + percentage + "%)");\r
-                    }\r
-                    @Override\r
-                    public boolean isCanceled() {\r
-                        return monitor.isCanceled();\r
-                    }\r
-                });\r
-                \r
-                setProperty(MigrationStateKeys.CURRENT_RESOURCE, indexRoot);\r
-                setProperty(MigrationStateKeys.CURRENT_ROOT_RESOURCES, new ArrayList<>(advisor.getRoots()));\r
-                setProperty(MigrationStateKeys.DATABASE_REVISION_AFTER_TG_IMPORT, session.getService(ManagementSupport.class).getHeadRevisionId());\r
-                setProperty(MigrationStateKeys.CURRENT_TG, null);\r
-\r
-                return getProperty(key);\r
-            }\r
-\r
-            final TransferableGraphSource tgs = getProperty(MigrationStateKeys.CURRENT_TGS);\r
-            if(tgs != null) {\r
-\r
-                final Resource indexRoot = session.syncRequest(new WriteResultRequest<Resource>() {\r
-                    @Override\r
-                    public Resource perform(WriteGraph graph) throws DatabaseException {\r
-                        if(!updateDependencies)\r
-                            Layer0Utils.setDependenciesIndexingDisabled(graph, true);\r
-                        return createTemporaryRoot(graph);\r
-                    }\r
-                });\r
-\r
-                IImportAdvisor baseAdvisor = MigrationUtils.getProperty(this, MigrationStateKeys.IMPORT_ADVISOR, new DefaultPasteImportAdvisor(indexRoot));\r
-                IImportAdvisor2 advisor = new WrapperAdvisor(baseAdvisor) {\r
-                       @Override\r
-                       public Resource getTarget() {\r
-                               return indexRoot;\r
-                       }\r
-                       @Override\r
-                    public void beforeWrite(WriteOnlyGraph graph, TransferableGraphImporter process) throws DatabaseException {\r
-                       super.beforeWrite(graph, process);\r
-                        if(!updateDependencies)\r
-                            Layer0Utils.setDependenciesIndexingDisabled(graph, true);\r
-                    }\r
-                       @Override\r
-                    public void afterWrite(WriteOnlyGraph graph, TransferableGraphImporter process) throws DatabaseException {\r
-                       super.afterWrite(graph, process);\r
-                       Boolean storeResources = probeProperty(MigrationStateKeys.GET_RESOURCE_IDS);\r
-                       if(storeResources != null && storeResources) {\r
-                               long[] ids = process.getResourceIds(session.getService(SerialisationSupport.class));\r
-                               setProperty(MigrationStateKeys.RESOURCE_IDS, ids);\r
-                       }\r
-                    }\r
-                               };\r
-                               // Make sure that the supplied advisor is redirected to temp\r
-                               advisor.redirect(indexRoot);\r
-                               \r
-                TransferableGraphs.importGraph1(session, tgs, advisor, new TGStatusMonitor() {\r
-                    @Override\r
-                    public void status(int percentage) {\r
-                        monitor.subTask("Importing model from file (" + percentage + "%)");\r
-                    }\r
-                    @Override\r
-                    public boolean isCanceled() {\r
-                        return monitor.isCanceled();\r
-                    }\r
-                });\r
-\r
-                setProperty(MigrationStateKeys.CURRENT_RESOURCE, indexRoot);\r
-                setProperty(MigrationStateKeys.CURRENT_ROOT_RESOURCES, new ArrayList<>(advisor.getRoots()));\r
-                setProperty(MigrationStateKeys.DATABASE_REVISION_AFTER_TG_IMPORT, session.getService(ManagementSupport.class).getHeadRevisionId());\r
-                setProperty(MigrationStateKeys.CURRENT_TG, null);\r
-\r
-                return getProperty(key);\r
-\r
-            }\r
-\r
-        } else if (MigrationStateKeys.UPDATE_DEPENDENCIES.equals(key)) {\r
-\r
-            return null;\r
-\r
-        }\r
-\r
-        return null;\r
-\r
-       }\r
-\r
-       @Override\r
-       public <T> void setProperty(String key, T value) {\r
-               properties.put(key, value);\r
-       }\r
-\r
-       @Override\r
-       public void dispose() {\r
-               // Close all possible open file handles\r
-               try {\r
-                       StreamingTransferableGraphFileReader tgs = probeProperty(MigrationStateKeys.CURRENT_TGS_READER);\r
-                       uncheckedClose(tgs);\r
-               } catch (DatabaseException e) {\r
-                       Logger.defaultLogError(e);\r
-               }\r
-       }\r
-\r
-       private static void uncheckedClose(ByteFileReader closeable) {\r
-               try {\r
-                       if (closeable != null)\r
-                               closeable.close();\r
-               } catch (IOException e) {\r
-                       //ignore\r
-               }\r
-       }\r
-\r
-    private Resource createTemporaryRoot(WriteGraph graph) throws DatabaseException {\r
-        Layer0 L0 = Layer0.getInstance(graph);\r
-        Resource project = SimanticsInternal.getProject();\r
-        Resource root = graph.getPossibleObject(project, L0.PartOf);\r
-        Resource temp = Layer0Utils.getPossibleChild(graph, root, "Temp");\r
-        if (temp == null) \r
-            throw new AssumptionException("Temporary folder 'Temp' not found under " + graph.getPossibleURI(root));\r
-\r
-        Resource indexRoot = graph.newResource();\r
-        String indexRootName = DateFormat.getDateTimeInstance(DateFormat.FULL, DateFormat.FULL).format(new Date());\r
-        graph.claim(indexRoot, L0.InstanceOf, L0.IndexRoot);\r
-        graph.addLiteral(indexRoot, L0.HasName, L0.String, indexRootName, Bindings.STRING);\r
-        graph.claim(temp, L0.ConsistsOf, indexRoot);\r
-        return indexRoot;\r
-    }\r
-\r
-}\r
+/*******************************************************************************
+ * Copyright (c) 2012 Association for Decentralized Information Management in
+ * Industry THTH ry.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package org.simantics.db.layer0.migration;
+
+import java.io.Closeable;
+import java.io.File;
+import java.io.IOException;
+import java.text.DateFormat;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Date;
+import java.util.HashMap;
+import java.util.Map;
+
+import org.eclipse.core.runtime.IProgressMonitor;
+import org.simantics.databoard.Bindings;
+import org.simantics.databoard.binding.mutable.Variant;
+import org.simantics.databoard.container.DataContainer;
+import org.simantics.databoard.container.DataContainers;
+import org.simantics.db.ReadGraph;
+import org.simantics.db.Resource;
+import org.simantics.db.Session;
+import org.simantics.db.WriteGraph;
+import org.simantics.db.WriteOnlyGraph;
+import org.simantics.db.common.request.WriteResultRequest;
+import org.simantics.db.common.utils.Logger;
+import org.simantics.db.common.utils.NameUtils;
+import org.simantics.db.exception.AssumptionException;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.db.layer0.adapter.impl.DefaultPasteImportAdvisor;
+import org.simantics.db.layer0.internal.SimanticsInternal;
+import org.simantics.db.layer0.util.Layer0Utils;
+import org.simantics.db.layer0.util.ModelTransferableGraphSourceRequest;
+import org.simantics.db.layer0.util.TGProgressMonitor;
+import org.simantics.db.layer0.util.TGTransferableGraphSource;
+import org.simantics.db.layer0.util.TransferableGraphConfiguration2;
+import org.simantics.db.request.Read;
+import org.simantics.db.service.ManagementSupport;
+import org.simantics.db.service.SerialisationSupport;
+import org.simantics.graph.db.IImportAdvisor;
+import org.simantics.graph.db.IImportAdvisor2;
+import org.simantics.graph.db.ImportResult;
+import org.simantics.graph.db.StreamingTransferableGraphFileReader;
+import org.simantics.graph.db.TGStatusMonitor;
+import org.simantics.graph.db.TransferableGraphImporter;
+import org.simantics.graph.db.TransferableGraphSource;
+import org.simantics.graph.db.TransferableGraphs;
+import org.simantics.graph.db.WrapperAdvisor;
+import org.simantics.graph.representation.TransferableGraph1;
+import org.simantics.graph.representation.TransferableGraphFileReader;
+import org.simantics.layer0.Layer0;
+import org.simantics.utils.logging.TimeLogger;
+
+public class MigrationStateImpl implements MigrationState {
+
+       final private HashMap<String, Object> properties = new HashMap<String, Object>();
+       
+    @SuppressWarnings("unchecked")
+    @Override
+    public <T> T probeProperty(String key) throws DatabaseException {
+        return (T)properties.get(key);
+    }
+
+       @SuppressWarnings("unchecked")
+    @Override
+       public <T> T getProperty(String key) throws DatabaseException {
+           
+           T property = (T)properties.get(key);
+           if(property != null) return property;
+           
+           if(MigrationStateKeys.BASE_URI.equals(key)) {
+               throw new IllegalStateException("Base URI needs to be supplied for migration.");
+        } else if (MigrationStateKeys.SESSION.equals(key)) {
+            throw new IllegalStateException("Session needs to be supplied for migration.");
+        } else if (MigrationStateKeys.MODEL_FILE.equals(key)) {
+            throw new IllegalStateException("Model file needs to be supplied for migration.");
+           } else if (MigrationStateKeys.CURRENT_TG.equals(key)) {
+               
+               final Resource resource = probeProperty(MigrationStateKeys.CURRENT_RESOURCE);
+               final Collection<Resource> roots = probeProperty(MigrationStateKeys.CURRENT_ROOT_RESOURCES);
+               if(roots != null) {
+                   Session session = getProperty(MigrationStateKeys.SESSION);
+                   TransferableGraph1 tg = session.syncRequest(new Read<TransferableGraph1>() {
+                       @Override
+                       public TransferableGraph1 perform(ReadGraph graph) throws DatabaseException {
+                           TransferableGraphConfiguration2 conf = new TransferableGraphConfiguration2(graph, roots, true, false);
+                           TransferableGraphSource source = graph.syncRequest(new ModelTransferableGraphSourceRequest(conf));
+                           return TransferableGraphs.create(graph, source);
+                       }
+                   });
+                   if (resource != null)
+                       MigrationUtils.clearTempResource(session, resource);
+                   setProperty(MigrationStateKeys.CURRENT_RESOURCE, null);
+                   setProperty(MigrationStateKeys.CURRENT_ROOT_RESOURCES, null);
+                setProperty(MigrationStateKeys.DATABASE_REVISION_AFTER_TG_IMPORT, null);
+                   setProperty(MigrationStateKeys.CURRENT_TG, tg);
+                   return (T)tg;
+               }
+               
+            TransferableGraphFileReader reader = null;
+            try {
+                File modelFile = getProperty(MigrationStateKeys.MODEL_FILE);
+                reader = new TransferableGraphFileReader(modelFile);
+                TimeLogger.log(MigrationStateImpl.class, "reading TG into memory from " + modelFile);
+                TransferableGraph1 tg = reader.readTG();
+                TimeLogger.log(MigrationStateImpl.class, "read TG into memory from " + modelFile);
+                setProperty(MigrationStateKeys.CURRENT_TG, tg);
+                return (T)tg;
+            } catch (DatabaseException e) {
+                throw e;
+            } catch (Throwable t) {
+                throw new DatabaseException(t);
+            } finally {
+                uncheckedClose(reader);
+            }
+               
+        } else if (MigrationStateKeys.CURRENT_TGS.equals(key)) {
+
+            File modelFile = getProperty(MigrationStateKeys.MODEL_FILE);
+            return (T) initializeTransferableGraphSource(modelFile);
+
+        } else if (MigrationStateKeys.CURRENT_DATA_CONTAINER.equals(key)) {
+            
+            try {
+                
+                TransferableGraphSource tgs = getProperty(MigrationStateKeys.CURRENT_TGS);
+                DataContainer dc = tgs.getHeader();
+                setProperty(MigrationStateKeys.CURRENT_DATA_CONTAINER, dc);
+                return (T)dc;
+                
+            } catch (DatabaseException e) {
+                throw e;
+            } catch (Throwable t) {
+                throw new DatabaseException(t);
+            }
+            
+        } else if (MigrationStateKeys.TG_EXTENSIONS.equals(key)) {
+            
+            try {
+                
+                TransferableGraphSource tgs = getProperty(MigrationStateKeys.CURRENT_TGS);
+                Map<String,Variant> extensions = tgs.getExtensions();
+                setProperty(MigrationStateKeys.TG_EXTENSIONS, extensions);
+                return (T)extensions;
+                
+            } catch (DatabaseException e) {
+                throw e;
+            } catch (Throwable t) {
+                throw new DatabaseException(t);
+            }
+
+        } else if (MigrationStateKeys.CURRENT_RESOURCE.equals(key) || MigrationStateKeys.CURRENT_ROOT_RESOURCES.equals(key)) {
+
+            final Session session = getProperty(MigrationStateKeys.SESSION);
+            final IProgressMonitor monitor = probeProperty(MigrationStateKeys.PROGRESS_MONITOR);
+            final boolean updateDependencies = MigrationUtils.getProperty(this, MigrationStateKeys.UPDATE_DEPENDENCIES, Boolean.TRUE);
+
+            File temporaryTg = exportCurrentTgAsTemporaryFile(session, monitor);
+            if (temporaryTg != null)
+                setProperty(MigrationStateKeys.CURRENT_TGS, initializeTransferableGraphSource(temporaryTg));
+
+            TransferableGraphSource tgs = getProperty(MigrationStateKeys.CURRENT_TGS);
+            if (tgs != null) {
+                importTransferableGraphSource(monitor, session, updateDependencies, tgs);
+                // Delete temporary file if necessary
+                if (temporaryTg != null)
+                    temporaryTg.delete();
+                return getProperty(key);
+            }
+
+        } else if (MigrationStateKeys.UPDATE_DEPENDENCIES.equals(key)) {
+
+            return null;
+
+        }
+
+        return null;
+
+       }
+
+       @Override
+       public <T> void setProperty(String key, T value) {
+               properties.put(key, value);
+       }
+
+       @Override
+       public void dispose() {
+               // Close all possible open file handles
+               try {
+                       StreamingTransferableGraphFileReader tgs = probeProperty(MigrationStateKeys.CURRENT_TGS_READER);
+                       uncheckedClose(tgs);
+               } catch (DatabaseException e) {
+                       Logger.defaultLogError(e);
+               }
+       }
+
+       private static void uncheckedClose(Closeable closeable) {
+               try {
+                       if (closeable != null)
+                               closeable.close();
+               } catch (IOException e) {
+                       //ignore
+               }
+       }
+
+    private Resource createTemporaryRoot(WriteGraph graph) throws DatabaseException {
+        Layer0 L0 = Layer0.getInstance(graph);
+        Resource project = SimanticsInternal.getProject();
+        Resource root = graph.getPossibleObject(project, L0.PartOf);
+        Resource temp = Layer0Utils.getPossibleChild(graph, root, "Temp");
+        if (temp == null) 
+            throw new AssumptionException("Temporary folder 'Temp' not found under " + graph.getPossibleURI(root));
+
+        Resource indexRoot = graph.newResource();
+        String indexRootName = DateFormat.getDateTimeInstance(DateFormat.FULL, DateFormat.FULL).format(new Date());
+        indexRootName = NameUtils.findFreshName(graph, indexRootName, temp, L0.ConsistsOf, "%s-%d");
+        graph.claim(indexRoot, L0.InstanceOf, L0.IndexRoot);
+        graph.addLiteral(indexRoot, L0.HasName, L0.String, indexRootName, Bindings.STRING);
+        graph.claim(temp, L0.ConsistsOf, indexRoot);
+        return indexRoot;
+    }
+
+       private File exportCurrentTgAsTemporaryFile(Session session, IProgressMonitor monitor) throws DatabaseException {
+               TransferableGraph1 tg = probeProperty(MigrationStateKeys.CURRENT_TG);
+               if (tg == null)
+                       return null;
+
+               try {
+                       // Write TG back to disk and initialize CURRENT_TGS for the migrated TG.
+                       File modelFile = getProperty(MigrationStateKeys.MODEL_FILE);
+                       File tempFile = File.createTempFile("temporary-tgs", ".tg", SimanticsInternal.getTemporaryDirectory());
+                       TimeLogger.log(MigrationStateImpl.class, "export temporary TG " + tempFile);
+
+                       DataContainer dc = DataContainers.readHeader(modelFile);
+                       TransferableGraphs.writeTransferableGraph(session, dc.format, dc.version, dc.metadata,
+                                       new TGTransferableGraphSource(tg),
+                                       tempFile,
+                                       new TGExportMonitor(monitor, "Exporting temporary transferable graph"));
+
+                       // Allow potentially large TG structure to be GC'ed.
+                       setProperty(MigrationStateKeys.CURRENT_TG, null);
+
+                       TimeLogger.log(MigrationStateImpl.class, "export temporary TG done " + tempFile);
+                       return tempFile;
+               } catch (Exception e) {
+                       throw new DatabaseException(e);
+               }
+       }
+
+       private TransferableGraphSource initializeTransferableGraphSource(File dataContainer) throws DatabaseException {
+               try {
+                       StreamingTransferableGraphFileReader reader = new StreamingTransferableGraphFileReader(dataContainer);
+                       TransferableGraphSource tgs = reader.readTG();
+                       setProperty(MigrationStateKeys.CURRENT_TGS_READER, reader);
+                       setProperty(MigrationStateKeys.CURRENT_TGS, tgs);
+                       return tgs;
+               } catch (DatabaseException e) {
+                       throw e;
+               } catch (IOException e) {
+                       throw new DatabaseException("An I/O exception occurred during reading '" + dataContainer.getAbsolutePath() + "'", e);
+               } catch (Throwable t) {
+                       throw new DatabaseException(t);
+               }
+       }
+
+       private void importTransferableGraphSource(IProgressMonitor monitor, Session session, boolean updateDependencies, TransferableGraphSource tgs) throws DatabaseException {
+               TimeLogger.log(MigrationStateImpl.class, "import TGS " + tgs);
+               final Resource indexRoot = session.syncRequest(new WriteResultRequest<Resource>() {
+                       @Override
+                       public Resource perform(WriteGraph graph) throws DatabaseException {
+                               if(!updateDependencies)
+                                       Layer0Utils.setDependenciesIndexingDisabled(graph, true);
+                               return createTemporaryRoot(graph);
+                       }
+               });
+
+               IImportAdvisor baseAdvisor = MigrationUtils.getProperty(this, MigrationStateKeys.IMPORT_ADVISOR, new DefaultPasteImportAdvisor(indexRoot));
+               IImportAdvisor2 advisor = new WrapperAdvisor(baseAdvisor) {
+                       @Override
+                       public Resource getTarget() {
+                               return indexRoot;
+                       }
+                       @Override
+                       public void beforeWrite(WriteOnlyGraph graph, TransferableGraphImporter process) throws DatabaseException {
+                               super.beforeWrite(graph, process);
+                               if(!updateDependencies)
+                                       Layer0Utils.setDependenciesIndexingDisabled(graph, true);
+                       }
+                       @Override
+                       public void afterWrite(WriteOnlyGraph graph, TransferableGraphImporter process) throws DatabaseException {
+                               super.afterWrite(graph, process);
+                               Boolean storeResources = probeProperty(MigrationStateKeys.GET_RESOURCE_IDS);
+                               if(storeResources != null && storeResources) {
+                                       long[] ids = process.getResourceIds(session.getService(SerialisationSupport.class));
+                                       setProperty(MigrationStateKeys.RESOURCE_IDS, ids);
+                               }
+                       }
+               };
+
+               // Make sure that the supplied advisor is redirected to temp
+               advisor.redirect(indexRoot);
+
+               String task = "Importing model into database";
+               monitor.subTask(task);
+               ImportResult ir = TransferableGraphs.importGraph1(session, tgs, advisor, new TGImportMonitor(monitor, task));
+               monitor.subTask("");
+
+               setProperty(MigrationStateKeys.IMPORT_RESULT, ir);
+               setProperty(MigrationStateKeys.CURRENT_RESOURCE, indexRoot);
+               setProperty(MigrationStateKeys.CURRENT_ROOT_RESOURCES, new ArrayList<>(advisor.getRoots()));
+               setProperty(MigrationStateKeys.DATABASE_REVISION_AFTER_TG_IMPORT, session.getService(ManagementSupport.class).getHeadRevisionId());
+               TimeLogger.log(MigrationStateImpl.class, "imported TGS " + tgs);
+       }
+
+       
+       static class TGImportMonitor implements TGStatusMonitor {
+               private final IProgressMonitor monitor;
+               private final String message;
+               public TGImportMonitor(IProgressMonitor monitor, String message) {
+                       this.monitor = monitor;
+                       this.message = message;
+               }
+               @Override
+               public void status(int percentage) {
+                       monitor.subTask(message + " (" + percentage + "%)");
+               }
+               @Override
+               public boolean isCanceled() {
+                       return monitor.isCanceled();
+               }
+       }
+
+       static class TGExportMonitor extends TGProgressMonitor {
+               private final String message;
+               public TGExportMonitor(IProgressMonitor monitor, String message) {
+                       super(monitor);
+                       this.message = message;
+               }
+               @Override
+               protected void workDone(int percentage) {
+                       monitor.subTask(message + " (" + percentage + "%)");
+               }
+       }
+
+}