1 files changed, 86 insertions, 0 deletions
diff --git a/branches/sca-java-0.99/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/service/DefaultContributionListenerExtensionPoint.java b/branches/sca-java-0.99/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/service/DefaultContributionListenerExtensionPoint.java
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+++ b/branches/sca-java-0.99/modules/contribution/src/main/java/org/apache/tuscany/sca/contribution/service/DefaultContributionListenerExtensionPoint.java
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+/*
+ * 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.contribution.service;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.tuscany.sca.contribution.util.ServiceConfigurationUtil;
+
+/**
+ * Default implementation of a contribution listener extension point.
+ *
+ * @version $Rev$ $Date$
+ */
+public class DefaultContributionListenerExtensionPoint implements ContributionListenerExtensionPoint {
+    
+    private List<ContributionListener> listeners = new ArrayList<ContributionListener>();
+    private boolean loadedListeners;
+
+    public void addContributionListener(ContributionListener listener) {
+        listeners.add(listener);
+    }
+
+    public List<ContributionListener> getContributionListeners() {
+        loadListeners();
+        return listeners;
+    }
+
+    public void removeContributionListener(ContributionListener listener) {
+        listeners.remove(listener);
+    }
+
+    /**
+     * Dynamically load listeners declared under META-INF/services
+     */
+    private void loadListeners() {
+        if (loadedListeners)
+            return;
+
+        // Get the databinding service declarations
+        ClassLoader classLoader = ContributionListener.class.getClassLoader();
+        List<String> listenerDeclarations; 
+        try {
+            listenerDeclarations = ServiceConfigurationUtil.getServiceClassNames(classLoader, ContributionListener.class.getName());
+        } catch (IOException e) {
+            throw new IllegalStateException(e);
+        }
+        
+        // Load data bindings
+        for (String listenerDeclaration: listenerDeclarations) {
+            ContributionListener listener;
+            try {
+                Class<ContributionListener> listenerClass = (Class<ContributionListener>)Class.forName(listenerDeclaration, true, classLoader);
+                listener = listenerClass.newInstance();
+            } catch (ClassNotFoundException e) {
+                throw new IllegalArgumentException(e);
+            } catch (InstantiationException e) {
+                throw new IllegalArgumentException(e);
+            } catch (IllegalAccessException e) {
+                throw new IllegalArgumentException(e);
+            }
+            addContributionListener(listener);
+        }
+        
+        loadedListeners = true;
+    }
+
+}