Index: topia2/src/java/org/codelutin/topia/event/TopiaTransactionEvent.java
diff -u topia2/src/java/org/codelutin/topia/event/TopiaTransactionEvent.java:1.4 topia2/src/java/org/codelutin/topia/event/TopiaTransactionEvent.java:1.5
--- topia2/src/java/org/codelutin/topia/event/TopiaTransactionEvent.java:1.4	Wed Nov 22 20:20:56 2006
+++ topia2/src/java/org/codelutin/topia/event/TopiaTransactionEvent.java	Fri Nov 16 11:26:16 2007
@@ -19,7 +19,6 @@
 package org.codelutin.topia.event;
 
 import java.util.EventObject;
-import java.util.HashSet;
 import java.util.Map;
 import java.util.Set;
 
@@ -27,7 +26,6 @@
 import org.codelutin.topia.TopiaContext;
 import org.codelutin.topia.framework.EntityState;
 import org.codelutin.topia.persistence.TopiaEntity;
-import org.hibernate.util.IdentitySet;
 
 public class TopiaTransactionEvent extends EventObject {
 

Index: topia2/src/java/org/codelutin/topia/event/TopiaContextEvent.java
diff -u /dev/null topia2/src/java/org/codelutin/topia/event/TopiaContextEvent.java:1.1
--- /dev/null	Fri Nov 16 11:26:21 2007
+++ topia2/src/java/org/codelutin/topia/event/TopiaContextEvent.java	Fri Nov 16 11:26:16 2007
@@ -0,0 +1,54 @@
+/* *##%
+ * Copyright (C) 2007 Code Lutin
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *##%*/
+
+package org.codelutin.topia.event;
+
+import java.util.EventObject;
+
+import org.codelutin.topia.TopiaContext;
+
+/**
+ * TopiaContextEvent
+ *
+ * @author chatellier
+ * @version $Revision: 1.1 $
+ *
+ * Last update : $Date: 2007-11-16 11:26:16 $
+ * By : $Author: chatellier $
+ */
+public class TopiaContextEvent extends EventObject {
+
+    /** Version UID */
+    private static final long serialVersionUID = 560256125962144181L;
+    
+    /**
+     * Constructor
+     * @param source
+     */
+    public TopiaContextEvent(Object source) {
+        super(source);
+    }
+    
+    /**
+     * Get source
+     */
+    public TopiaContext getSource() {
+        return (TopiaContext)source;
+    }
+    
+}

Index: topia2/src/java/org/codelutin/topia/event/TopiaContextListener.java
diff -u /dev/null topia2/src/java/org/codelutin/topia/event/TopiaContextListener.java:1.1
--- /dev/null	Fri Nov 16 11:26:21 2007
+++ topia2/src/java/org/codelutin/topia/event/TopiaContextListener.java	Fri Nov 16 11:26:16 2007
@@ -0,0 +1,62 @@
+/* *##%
+ * Copyright (C) 2007 Code Lutin
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *##%*/
+
+package org.codelutin.topia.event;
+
+import java.util.EventListener;
+
+/**
+ * Listener for TopiaContext actions.
+ * 
+ * Listener are notified for action such as :
+ *  - createSchema
+ *  - updateSchema
+ *  - ...
+ *
+ * @author chatellier
+ * @version $Revision: 1.1 $
+ *
+ * Last update : $Date: 2007-11-16 11:26:16 $
+ * By : $Author: chatellier $
+ */
+public interface TopiaContextListener extends EventListener {
+
+    /**
+     * Called before createSchema call
+     * @param event evet
+     */
+    public void preCreateSchema(TopiaContextEvent event);
+    
+    /**
+     * Called after createSchema call
+     * @param event event
+     */
+    public void postCreateSchema(TopiaContextEvent event);
+    
+    /**
+     * Called before updateSchema call
+     * @param event event
+     */
+    public void preUpdateSchema(TopiaContextEvent event);
+    
+    /**
+     * Called after updateSchema call
+     * @param event event
+     */
+    public void postUpdateSchema(TopiaContextEvent event);
+}