--- /dev/null
+/*******************************************************************************\r
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
+ * in 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.common.procedure.adapter;\r
+\r
+import java.util.concurrent.atomic.AtomicBoolean;\r
+\r
+import org.simantics.db.procedure.Listener;\r
+\r
+abstract public class StagedListener<T> implements Listener<T> {\r
+\r
+ final private AtomicBoolean first = new AtomicBoolean(true); \r
+ \r
+ @Override\r
+ public void exception(Throwable t) {\r
+ }\r
+\r
+ @Override\r
+ final public void execute(T result) {\r
+ if(first.compareAndSet(true, false)) {\r
+ first(result);\r
+ } else {\r
+ rest(result);\r
+ }\r
+ }\r
+\r
+ @Override\r
+ public boolean isDisposed() {\r
+ return false;\r
+ }\r
+\r
+ abstract public void first(T result);\r
+ abstract public void rest(T result);\r
+\r
+}\r