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Diffstat (limited to 'branches/sca-android-r643746/modules/core/src/main/java/org/apache/tuscany/sca/core/event/BaseEventPublisher.java')
-rw-r--r-- | branches/sca-android-r643746/modules/core/src/main/java/org/apache/tuscany/sca/core/event/BaseEventPublisher.java | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/branches/sca-android-r643746/modules/core/src/main/java/org/apache/tuscany/sca/core/event/BaseEventPublisher.java b/branches/sca-android-r643746/modules/core/src/main/java/org/apache/tuscany/sca/core/event/BaseEventPublisher.java new file mode 100644 index 0000000000..936717d7fd --- /dev/null +++ b/branches/sca-android-r643746/modules/core/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;
+ }
+
+}
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