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diff --git a/bundles/org.simantics.db.procore/src/org/simantics/db/procore/cluster/ClusterImpl.java b/bundles/org.simantics.db.procore/src/org/simantics/db/procore/cluster/ClusterImpl.java
new file mode 100644
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+++ b/bundles/org.simantics.db.procore/src/org/simantics/db/procore/cluster/ClusterImpl.java
@@ -0,0 +1,140 @@
+/*******************************************************************************
+ * Copyright (c) 2007, 2010 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.procore.cluster;
+
+import java.util.UUID;
+
+import org.simantics.db.common.utils.Logger;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.db.exception.InvalidClusterException;
+import org.simantics.db.impl.ClusterBase;
+import org.simantics.db.impl.ClusterSupport;
+import org.simantics.db.impl.IClusterTable;
+import org.simantics.db.impl.Modifier;
+import org.simantics.db.service.ClusterCollectorPolicy.CollectorCluster;
+import org.simantics.db.service.ClusterUID;
+import org.simantics.db.service.ClusteringSupport.Id;
+
+import fi.vtt.simantics.procore.internal.Change;
+import fi.vtt.simantics.procore.internal.ClusterChange;
+import fi.vtt.simantics.procore.internal.ClusterTable;
+import fi.vtt.simantics.procore.internal.SessionImplSocket;
+
+public abstract class ClusterImpl extends ClusterBase implements Modifier, CollectorCluster {
+    private static final int LONG_HEADER_SIZE = 7;
+    private static final long LONG_HEADER_VERSION = 1;
+    protected static ClusterUID checkValidity(long type, long[] longs, int[] ints, byte[] bytes)
+    throws InvalidClusterException {
+        if (longs.length < LONG_HEADER_SIZE)
+            throw new InvalidClusterException("Header size mismatch. Expected=" + ClusterImpl.LONG_HEADER_SIZE + ", got=" + longs.length);
+        if (longs[0] != type)
+            throw new InvalidClusterException("Type mismatch. Expected=" + type + ", got=" + longs[0]);
+        if (longs[1] != ClusterImpl.LONG_HEADER_VERSION)
+            throw new InvalidClusterException("Header size mismatch. Expected=" + ClusterImpl.LONG_HEADER_VERSION + ", got=" + longs[1]);
+        return ClusterUID.make(longs[2], longs[3]);
+    }
+    protected static Id getUniqueId(long[] longs) {
+        return new IdImpl(new UUID(longs[3], longs[4]));
+    }
+    static final boolean DEBUG = false;
+    // This can be null iff the cluster has been converted to big
+    public Change change = new Change();
+    public ClusterChange cc;
+    public byte[] foreignLookup;
+    
+    private boolean dirtySizeInBytes = true;
+    private long sizeInBytes = 0;
+    
+    protected ClusterTable clusterTable;
+    
+    public ClusterImpl(ClusterUID clusterUID, int clusterKey, ClusterSupport support) {
+        super(support, clusterUID, clusterKey);
+        this.clusterTable = ((SessionImplSocket)support.getSession()).clusterTable;
+    }
+    
+    public static ClusterImpl make(ClusterUID clusterUID, int clusterKey, ClusterSupport support) {
+        return new ClusterSmall(clusterUID, clusterKey, support);
+    }
+    public static ClusterSmall proxy(ClusterUID clusterUID, int clusterKey, long clusterId, ClusterSupport support) {
+        if (DEBUG)
+            new Exception("Cluster proxy for " + clusterUID).printStackTrace();
+        return new ClusterSmall(clusterUID, clusterKey, ((SessionImplSocket)support.getSession()).clusterTable, support);
+    }
+    public static ClusterImpl make(long[] longs, int[] ints, byte[] bytes, ClusterSupport support, int clusterKey)
+    throws DatabaseException {
+        if (longs[0] == 0)
+            return new ClusterBig(longs, ints, bytes, support, clusterKey);
+        else
+            return new ClusterSmall(longs, ints, bytes, support, clusterKey);
+    }
+    public abstract ClusterBig toBig(ClusterSupport support)
+    throws DatabaseException;
+    
+    public abstract void checkDirectReference(int dr)
+    throws DatabaseException;
+
+    public abstract void checkForeingIndex(int fi)
+    throws DatabaseException;
+
+    public abstract void checkObjectSetReference(int or)
+    throws DatabaseException;
+
+//    public boolean virtual = false;
+    
+    @Override
+    public boolean hasVirtual() {
+        return clusterTable.hasVirtual(clusterKey);
+    }
+
+    @Override
+    public void markVirtual() {
+        clusterTable.markVirtual(clusterKey);
+//        virtual = true;
+    }
+    
+    @Override
+    public boolean isWriteOnly() {
+        return false;
+    }
+    @Override
+    public boolean isLoaded() {
+        return true;
+    }
+    
+    @Override
+    public void resized() {
+        dirtySizeInBytes = true;
+        clusterTable.setDirtySizeInBytes(true);
+    }
+    
+    public long getCachedSize() {
+        if(dirtySizeInBytes) {
+            try {
+                sizeInBytes = getUsedSpace();
+                //System.err.println("recomputed size of cluster " + getClusterId() + " => " + sizeInBytes);
+            } catch (DatabaseException e) {
+                Logger.defaultLogError(e);
+            }
+            dirtySizeInBytes = false;
+        }
+        return sizeInBytes;
+    }
+
+    protected void calculateModifiedId() {
+//        setModifiedId(new IdImpl(UUID.randomUUID()));
+    }
+    
+    @Override
+    public IClusterTable getClusterTable() {
+        return clusterTable;
+    }
+}