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diff --git a/bundles/org.simantics.db.impl/src/org/simantics/db/impl/query/DirectPredicates.java b/bundles/org.simantics.db.impl/src/org/simantics/db/impl/query/DirectPredicates.java
new file mode 100644
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+++ b/bundles/org.simantics.db.impl/src/org/simantics/db/impl/query/DirectPredicates.java
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+/*******************************************************************************
+ * 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.impl.query;
+
+import java.util.concurrent.Semaphore;
+
+import org.simantics.db.common.exception.DebugException;
+import org.simantics.db.impl.graph.ReadGraphImpl;
+import org.simantics.db.impl.procedure.IntProcedureAdapter;
+import org.simantics.db.procedure.ListenerBase;
+
+final public class DirectPredicates extends CollectionUnaryQuery<IntProcedure> {
+
+	private DirectPredicates(final int resource) {
+		super(resource);
+	}
+
+	final static DirectPredicates entry(final QueryProcessor provider, final int r) {
+
+		return (DirectPredicates)provider.directPredicatesMap.get(r);
+
+	}
+
+	final static void runner(ReadGraphImpl graph, final int r, final QueryProcessor provider, final CacheEntry parent, final ListenerBase listener, final IntProcedure procedure) {
+
+		DirectPredicates entry = (DirectPredicates)provider.directPredicatesMap.get(r);
+		if(entry == null) {
+
+			entry = new DirectPredicates(r);
+        	entry.setPending();
+        	entry.clearResult(provider.querySupport);
+        	entry.putEntry(provider);
+			
+			provider.performForEach(graph, entry, parent, listener, procedure);
+			
+		} else {
+			
+			if(!entry.isReady()) {
+				synchronized(entry) {
+					if(!entry.isReady()) {
+						provider.registerDependencies(graph, entry, parent, listener, procedure, false);
+						entry.computeForEach(graph, provider, procedure, true);
+						return;
+					}
+				}
+			}
+			
+			provider.performForEach(graph, entry, parent, listener, procedure);
+			
+		}
+
+	}
+
+	final public static void queryEach(ReadGraphImpl graph, final int r, final QueryProcessor provider, final CacheEntry parent, final ListenerBase listener, final IntProcedure procedure) {
+
+		if(parent == null && listener == null) {
+			DirectPredicates entry = (DirectPredicates)provider.directPredicatesMap.get(r);
+			if(entry != null && entry.isReady()) { 
+				entry.performFromCache(graph, provider, procedure);
+				return;
+			} else {
+			    computeForEach(graph, r, null, procedure, false);
+			    return;
+			}
+		}
+
+		runner(graph, r, provider, parent, listener, procedure);
+
+	}
+
+	
+	@Override
+	public void clearResult(QuerySupport support) {
+		// The cached result is never used
+		setResult(INVALID_RESULT);
+	}
+	
+	@Override
+	public UnaryQuery<IntProcedure> getEntry(QueryProcessor provider) {
+		return provider.directPredicatesMap.get(id);
+	}
+
+	@Override
+	public void putEntry(QueryProcessor provider) {
+		provider.directPredicatesMap.put(id, this);
+	}
+
+	@Override
+	final public void removeEntry(QueryProcessor provider) {
+		provider.directPredicatesMap.remove(id);
+	}
+
+	@Override
+	public Object computeForEach(ReadGraphImpl graph, QueryProcessor provider, IntProcedure procedure, boolean store) {
+	    return computeForEach(graph, id, this, procedure, store);
+	}
+	
+	public static Object computeForEach(ReadGraphImpl graph, int id, final DirectPredicates entry, final IntProcedure procedure, final boolean store) {
+
+		graph.processor.querySupport.ensureLoaded(graph, id);
+		
+		final IntArray list = new IntArray();
+
+		graph.processor.querySupport.getPredicates(graph, id, new IntProcedure() {
+
+			@Override
+			public void execute(ReadGraphImpl graph, int i) {
+				list.add(i);
+			}
+
+			@Override
+			public void finished(ReadGraphImpl graph) {
+			}
+
+			@Override
+			public void exception(ReadGraphImpl graph, Throwable t) {
+				if(DebugException.DEBUG) new DebugException(t).printStackTrace();
+			}
+
+		});
+
+		if(entry != null)
+		    entry.finish(graph, graph.processor);
+
+		if(list.data == null) {
+			if(list.sizeOrData != IntArray.NO_DATA) procedure.execute(graph, list.sizeOrData);
+		} else {
+			for(int i = 0;i < list.sizeOrData ; i++) procedure.execute(graph, list.data[i]);
+		}
+
+		procedure.finished(graph);
+		
+		return list;
+
+	}
+
+	@Override
+	public String toString() {
+		return "DirectPredicates[" + id + "]";
+	}
+
+	@Override
+	public void setReady() {
+		statusOrException = READY;
+	}
+	
+	final private void finish(ReadGraphImpl graph, QueryProcessor provider) {
+
+		setReady();
+
+	}
+
+	@Override
+	public Object performFromCache(ReadGraphImpl graph, QueryProcessor provider, IntProcedure procedure) {
+
+		assert(isReady());
+
+		return computeForEach(graph, provider, procedure, false);
+
+	}
+
+	@Override
+	public void recompute(ReadGraphImpl graph, QueryProcessor provider) {
+
+		final Semaphore s = new Semaphore(0);
+
+		computeForEach(graph, provider, new IntProcedureAdapter() {
+
+			@Override
+			public void finished(ReadGraphImpl graph) {
+				s.release();
+			}
+
+			@Override
+			public void exception(ReadGraphImpl graph, Throwable t) {
+				s.release();
+				new Error("Error in recompute.", t).printStackTrace();
+			}
+
+		}, true);
+
+        while(!s.tryAcquire()) {
+        	provider.resume(graph);
+        }
+
+	}
+
+
+    @Override
+    boolean isImmutable(ReadGraphImpl graph) {
+    	return graph.processor.isImmutable(id);
+    }
+
+}