From a40e527938d76ba71f211da7e327adb50384ba69 Mon Sep 17 00:00:00 2001
From: lresende <lresende@13f79535-47bb-0310-9956-ffa450edef68>
Date: Wed, 11 Nov 2009 23:26:33 +0000
Subject: Moving 1.x tags

git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@835157 13f79535-47bb-0310-9956-ffa450edef68
---
 .../sca/extension/helper/impl/DiscoveryUtils.java  | 113 +++++++++++++++++++++
 1 file changed, 113 insertions(+)
 create mode 100644 sca-java-1.x/tags/1.5-RC0/modules/extension-helper/src/main/java/org/apache/tuscany/sca/extension/helper/impl/DiscoveryUtils.java

(limited to 'sca-java-1.x/tags/1.5-RC0/modules/extension-helper/src/main/java/org/apache/tuscany/sca/extension/helper/impl/DiscoveryUtils.java')

diff --git a/sca-java-1.x/tags/1.5-RC0/modules/extension-helper/src/main/java/org/apache/tuscany/sca/extension/helper/impl/DiscoveryUtils.java b/sca-java-1.x/tags/1.5-RC0/modules/extension-helper/src/main/java/org/apache/tuscany/sca/extension/helper/impl/DiscoveryUtils.java
new file mode 100644
index 0000000000..720d409a44
--- /dev/null
+++ b/sca-java-1.x/tags/1.5-RC0/modules/extension-helper/src/main/java/org/apache/tuscany/sca/extension/helper/impl/DiscoveryUtils.java
@@ -0,0 +1,113 @@
+/*
+ * 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.extension.helper.impl;
+
+import java.io.IOException;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Set;
+
+import org.apache.tuscany.sca.core.ExtensionPointRegistry;
+import org.apache.tuscany.sca.extensibility.ServiceDeclaration;
+import org.apache.tuscany.sca.extensibility.ServiceDiscovery;
+
+/**
+ * Discovers Activators in the classpath using the J2SE
+ * jar file extensions for Service Provider discovery
+ *
+ * @version $Rev$ $Date$
+ */
+public class DiscoveryUtils {
+
+    @SuppressWarnings("unchecked")
+    public static <T> List<T> discoverActivators(Class<T> activatorClass, ExtensionPointRegistry registry) {
+        List<T> activators;
+        try {
+            Set<ServiceDeclaration> activatorClasses =
+                ServiceDiscovery.getInstance().getServiceDeclarations(activatorClass);
+            activators = new ArrayList<T>();
+            for (ServiceDeclaration declaration : activatorClasses) {
+                try {
+                    Class<T> c = (Class<T>)declaration.loadClass();
+                    activators.add(c.cast(instantiateActivator(c, registry)));
+                } catch (Throwable e) {
+                    e.printStackTrace(); // TODO: log
+                }
+            }
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+        return activators;
+    }
+
+    static Object instantiateActivator(Class activator, ExtensionPointRegistry registry) {
+        Constructor[] cs = activator.getConstructors();
+        if (cs.length != 1) {
+            throw new RuntimeException("Activator must have only one constructors");
+        }
+
+        Class<?>[] paramTypes = cs[0].getParameterTypes();
+        Object[] extensions = new Object[paramTypes.length];
+
+        for (int i = 0; i < paramTypes.length; i++) {
+            if ("org.apache.tuscany.sca.host.http.ServletHost".equals(paramTypes[i].getName())) {
+                extensions[i] = getServletHost(registry);
+            } else {
+                extensions[i] = registry.getExtensionPoint(paramTypes[i]);
+            }
+        }
+
+        try {
+
+            return cs[0].newInstance(extensions);
+
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    private static Object getServletHost(ExtensionPointRegistry registry) {
+        try {
+
+            Class<?> servletHostEPClass = Class.forName("org.apache.tuscany.sca.host.http.ServletHostExtensionPoint");
+            Object servletHostEP = registry.getExtensionPoint(servletHostEPClass);
+            Class<?> extensibleServletHost = Class.forName("org.apache.tuscany.sca.host.http.ExtensibleServletHost");
+            return extensibleServletHost.getConstructor(new Class[] {servletHostEPClass}).newInstance(servletHostEP);
+
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException(e);
+        } catch (IllegalArgumentException e) {
+            throw new RuntimeException(e);
+        } catch (SecurityException e) {
+            throw new RuntimeException(e);
+        } catch (InstantiationException e) {
+            throw new RuntimeException(e);
+        } catch (IllegalAccessException e) {
+            throw new RuntimeException(e);
+        } catch (InvocationTargetException e) {
+            throw new RuntimeException(e);
+        } catch (NoSuchMethodException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+}
-- 
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