General event listening interface for DB and purge events.

[simantics/platform.git] / bundles / org.simantics.db.procore / src / fi / vtt / simantics / procore / internal / EventSupportImpl.java

diff --git a/bundles/org.simantics.db.procore/src/fi/vtt/simantics/procore/internal/EventSupportImpl.java b/bundles/org.simantics.db.procore/src/fi/vtt/simantics/procore/internal/EventSupportImpl.java
new file mode 100644 (file)
index 0000000..89a1bfd
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+++ b/bundles/org.simantics.db.procore/src/fi/vtt/simantics/procore/internal/EventSupportImpl.java
@@ -0,0 +1,46 @@
+/*******************************************************************************
+ * Copyright (c) 2019 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:
+ *     Semantum Oy - initial API and implementation
+ *******************************************************************************/
+package fi.vtt.simantics.procore.internal;
+
+import java.util.concurrent.CopyOnWriteArrayList;
+
+import org.simantics.db.service.EventSupport;
+
+/**
+ * Simple implementation for Event Support.
+ * 
+ * Note: for more extended / complicated scenarios, we could use org.simantics.utils.threads.SyncListenerList.
+ * 
+ * @author luukkainen
+ *
+ */
+public class EventSupportImpl implements EventSupport {
+    
+    private CopyOnWriteArrayList<EventListener> listeners = new CopyOnWriteArrayList<>();
+    
+    @Override
+    public synchronized void addListener(EventListener l) {
+        listeners.add(l);
+    }
+    
+    @Override
+    public synchronized void removeListener(EventListener l) {
+        listeners.remove(l);
+    }
+    
+    public void fireEvent(String type, Object data) {
+        for (EventListener l : listeners) {
+            l.event(type, data);
+        }
+    }
+
+}