+/*******************************************************************************\r
+ * Copyright (c) 2007 VTT Technical Research Centre of Finland and others.\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.simulation.data;\r
+\r
+import java.util.concurrent.locks.Lock;\r
+import java.util.concurrent.locks.ReentrantLock;\r
+\r
+import org.simantics.utils.datastructures.ListenerList;\r
+\r
+/**\r
+ * @author Toni Kalajainen\r
+ */\r
+public abstract class AbstractDatasource implements Datasource {\r
+\r
+ protected ListenerList<DatasourceListener> listeners = new ListenerList<DatasourceListener>(DatasourceListener.class);\r
+ protected Lock readLock, writeLock;\r
+\r
+ public AbstractDatasource() {\r
+// ReentrantReadWriteLock l = new ReentrantReadWriteLock();\r
+// this.readLock = l.readLock();\r
+// this.writeLock = l.writeLock();\r
+ this.readLock = this.writeLock = new ReentrantLock();\r
+ }\r
+\r
+ @Override\r
+ public void addListener(DatasourceListener listener) {\r
+ listeners.add(listener);\r
+ }\r
+\r
+ @Override\r
+ public void removeListener(DatasourceListener listener) {\r
+ listeners.remove(listener);\r
+ }\r
+\r
+ protected void notifyStep() {\r
+ for (final DatasourceListener l : listeners.getListeners()) {\r
+ if (l.getExecutor() == null) {\r
+ l.onStep( AbstractDatasource.this );\r
+ } else {\r
+ l.getExecutor().execute(new Runnable() {\r
+ public void run() {\r
+ l.onStep(AbstractDatasource.this);\r
+ }\r
+ });\r
+ }\r
+ }\r
+ }\r
+\r
+ @Override\r
+ public Lock readLock() {\r
+ return readLock;\r
+ }\r
+\r
+}\r