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diff --git a/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/service/ActivationManager.java b/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/service/ActivationManager.java
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+++ b/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/service/ActivationManager.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.layer0.service;
+
+import java.util.Collection;
+
+import org.simantics.db.RequestProcessor;
+import org.simantics.db.Resource;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.db.layer0.adapter.Activation;
+
+/**
+ * Manages trigger activations.
+ * This is a Session service. Acquire it 
+ * by calling Session.getService(ActivationManager.class).
+ */
+public interface ActivationManager {
+	
+	/**
+	 * Activates all triggers attached to the resource
+	 * (by HasTrigger-relation). A trigger is active
+	 * as long as there is one or more activations 
+	 * referring to it. 
+	 */
+	Collection<Activation> activate(RequestProcessor processor, Resource resource) throws DatabaseException;
+	
+	//Activation activate(Resource resource);
+	
+}