1 files changed, 89 insertions, 0 deletions
diff --git a/sandbox/mobile-android/core-android/src/main/java/org/apache/tuscany/sca/core/event/BaseEventPublisher.java b/sandbox/mobile-android/core-android/src/main/java/org/apache/tuscany/sca/core/event/BaseEventPublisher.java
new file mode 100644
index 0000000000..936717d7fd
--- /dev/null
+++ b/sandbox/mobile-android/core-android/src/main/java/org/apache/tuscany/sca/core/event/BaseEventPublisher.java
@@ -0,0 +1,89 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.tuscany.sca.core.event;
+
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.CopyOnWriteArrayList;
+
+import org.apache.tuscany.sca.event.Event;
+import org.apache.tuscany.sca.event.EventFilter;
+import org.apache.tuscany.sca.event.EventPublisher;
+import org.apache.tuscany.sca.event.RuntimeEventListener;
+import org.apache.tuscany.sca.event.TrueFilter;
+
+/**
+ * Base implementation of an <code>EventPublisher</code>
+ *
+ * @version $Rev: 537240 $ $Date: 2007-05-11 10:35:03 -0700 (Fri, 11 May 2007) $
+ */
+public abstract class BaseEventPublisher implements EventPublisher {
+    protected static final EventFilter TRUE_FILTER = new TrueFilter();
+    protected Map<EventFilter, List<RuntimeEventListener>> listeners;
+
+    public void addListener(RuntimeEventListener listener) {
+        addListener(TRUE_FILTER, listener);
+    }
+
+    public void removeListener(RuntimeEventListener listener) {
+        assert listener != null : "Listener cannot be null";
+        synchronized (getListeners()) {
+            for (List<RuntimeEventListener> currentList : getListeners().values()) {
+                for (RuntimeEventListener current : currentList) {
+                    if (current == listener) {
+                        currentList.remove(current);
+                        return;
+                    }
+                }
+            }
+        }
+    }
+
+    public void addListener(EventFilter filter, RuntimeEventListener listener) {
+        assert listener != null : "Listener cannot be null";
+        synchronized (getListeners()) {
+            List<RuntimeEventListener> list = getListeners().get(filter);
+            if (list == null) {
+                list = new CopyOnWriteArrayList<RuntimeEventListener>();
+                listeners.put(filter, list);
+            }
+            list.add(listener);
+        }
+    }
+
+    public void publish(Event event) {
+        assert event != null : "Event object was null";
+        for (Map.Entry<EventFilter, List<RuntimeEventListener>> entry : getListeners().entrySet()) {
+            if (entry.getKey().match(event)) {
+                for (RuntimeEventListener listener : entry.getValue()) {
+                    listener.onEvent(event);
+                }
+            }
+        }
+    }
+
+    protected Map<EventFilter, List<RuntimeEventListener>> getListeners() {
+        if (listeners == null) {
+            listeners = new ConcurrentHashMap<EventFilter, List<RuntimeEventListener>>();
+        }
+        return listeners;
+    }
+
+}