Move Tuscany from Incubator to top level.

git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@668359 13f79535-47bb-0310-9956-ffa450edef68

14 files changed, 1425 insertions, 0 deletions

diff --git a/java/sca/modules/extensibility/LICENSE b/java/sca/modules/extensibility/LICENSE
new file mode 100644
index 0000000000..8aa906c321
--- /dev/null
+++ b/java/sca/modules/extensibility/LICENSE
@@ -0,0 +1,205 @@
+
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+
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+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
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+      the terms of any separate license agreement you may have executed
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diff --git a/java/sca/modules/extensibility/NOTICE b/java/sca/modules/extensibility/NOTICE
new file mode 100644
index 0000000000..b3e4797aaa
--- /dev/null
+++ b/java/sca/modules/extensibility/NOTICE
@@ -0,0 +1,5 @@
+Copyright (c) 2005 - 2008 The Apache Software Foundation
+
+This product includes software developed by
+The Apache Software Foundation (http://www.apache.org/).
+
diff --git a/java/sca/modules/extensibility/pom.xml b/java/sca/modules/extensibility/pom.xml
new file mode 100644
index 0000000000..01cd2d0ca9
--- /dev/null
+++ b/java/sca/modules/extensibility/pom.xml
@@ -0,0 +1,50 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+ * 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.    
+-->
+<project>
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>org.apache.tuscany.sca</groupId>
+        <artifactId>tuscany-modules</artifactId>
+        <version>1.4-SNAPSHOT</version>
+        <relativePath>../pom.xml</relativePath>
+    </parent>
+    <artifactId>tuscany-extensibility</artifactId>
+    <name>Apache Tuscany SCA Extensibility</name>
+
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.felix</groupId>
+                <artifactId>maven-bundle-plugin</artifactId>
+
+                <configuration>
+                    <instructions>
+                        <Bundle-Version>${tuscany.version}</Bundle-Version>
+                        <Bundle-SymbolicName>org.apache.tuscany.sca.extensibility</Bundle-SymbolicName>
+                        <Bundle-Description>${pom.name}</Bundle-Description>
+                        <Export-Package>org.apache.tuscany.sca.*</Export-Package>
+                    </instructions>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>
diff --git a/java/sca/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/DefaultExtensionPointRegistry.java b/java/sca/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/DefaultExtensionPointRegistry.java
new file mode 100644
index 0000000000..48f240559c
--- /dev/null
+++ b/java/sca/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/DefaultExtensionPointRegistry.java
@@ -0,0 +1,184 @@
+/*
+ * 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;
+
+import java.io.IOException;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Modifier;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+
+import org.apache.tuscany.sca.extensibility.ServiceDiscovery;
+
+/**
+ * Default implementation of a registry to hold all the Tuscany core extension
+ * points. As the point of contact for all extension artifacts this registry
+ * allows loaded extensions to find all other parts of the system and register
+ * themselves appropriately.
+ *
+ * @version $Rev$ $Date$
+ */
+public class DefaultExtensionPointRegistry implements ExtensionPointRegistry {
+    private Map<Class<?>, Object> extensionPoints = new HashMap<Class<?>, Object>();
+    
+    /**
+     * Constructs a new registry. 
+     */
+    public DefaultExtensionPointRegistry() {
+    }
+
+    /**
+     * Add an extension point to the registry. This default implementation
+     * stores extensions against the interfaces that they implement.
+     *
+     * @param extensionPoint The instance of the extension point
+     *
+     * @throws IllegalArgumentException if extensionPoint is null
+     */
+    public void addExtensionPoint(Object extensionPoint) {
+        if (extensionPoint == null) {
+            throw new IllegalArgumentException("Cannot register null as an ExtensionPoint");
+        }
+
+        Set<Class<?>> interfaces = getAllInterfaces(extensionPoint.getClass());
+        for (Class<?> i : interfaces) {
+            extensionPoints.put(i, extensionPoint);
+        }
+    }
+    
+    private Constructor<?> getConstructor(Constructor<?>[] constructors, Class<?>[] paramTypes) {
+        for (Constructor<?> c : constructors) {
+            Class<?>[] types = c.getParameterTypes();
+            if (c.getParameterTypes().length == paramTypes.length) {
+                boolean found = true;
+                for (int i = 0; i < types.length; i++) {
+                    if (types[i] != paramTypes[i]) {
+                        found = false;
+                        break;
+                    }
+                }
+                if (found) {
+                    return c;
+                }
+            }
+        }
+        return null;
+    }
+
+    /**
+     * Get the extension point by the interface that it implements
+     *
+     * @param extensionPointType The lookup key (extension point interface)
+     * @return The instance of the extension point
+     *
+     * @throws IllegalArgumentException if extensionPointType is null
+     */
+    public <T> T getExtensionPoint(Class<T> extensionPointType) {
+        if (extensionPointType == null) {
+            throw new IllegalArgumentException("Cannot lookup ExtensionPoint of type null");
+        }
+
+        Object extensionPoint = extensionPoints.get(extensionPointType);
+        if (extensionPoint == null) {
+            
+            // Dynamically load an extension point class declared under META-INF/services           
+            try {
+                Class<?> extensionPointClass = 
+                	ServiceDiscovery.getInstance().loadFirstServiceClass(extensionPointType);
+                if (extensionPointClass != null) {
+                    // Construct the extension point
+                    Constructor<?>[] constructors = extensionPointClass.getConstructors();
+                    Constructor<?> constructor = getConstructor(constructors, new Class<?>[] {ExtensionPointRegistry.class});
+                    if (constructor != null) {
+                        extensionPoint = constructor.newInstance(this);
+                    } else {
+                        constructor = getConstructor(constructors, new Class<?>[] {});
+                        if (constructor != null) {
+                            extensionPoint = constructor.newInstance();
+                        } else {
+                            throw new IllegalArgumentException(
+                                                               "No valid constructor is found for " + extensionPointClass);
+                        }
+                    }
+                   
+                    // Cache the loaded extension point
+                    addExtensionPoint(extensionPoint);
+                }
+            } catch (InvocationTargetException e) {
+                throw new IllegalArgumentException(e);
+            } catch (IOException e) {
+                throw new IllegalArgumentException(e);
+            } catch (ClassNotFoundException e) {
+                throw new IllegalArgumentException(e);
+            } catch (InstantiationException e) {
+                throw new IllegalArgumentException(e);
+            } catch (IllegalAccessException e) {
+                throw new IllegalArgumentException(e);
+            }
+        }
+        return extensionPointType.cast(extensionPoint);
+    }
+
+    /**
+     * Remove an extension point based on the interface that it implements
+     *
+     * @param extensionPoint The extension point to remove
+     *
+     * @throws IllegalArgumentException if extensionPoint is null
+     */
+    public void removeExtensionPoint(Object extensionPoint) {
+        if (extensionPoint == null) {
+            throw new IllegalArgumentException("Cannot remove null as an ExtensionPoint");
+        }
+
+        Set<Class<?>> interfaces = getAllInterfaces(extensionPoint.getClass());
+        for (Class<?> i : interfaces) {
+            extensionPoints.remove(i);
+        }
+    }
+
+    /**
+     * Returns the set of interfaces implemented by the given class and its
+     * ancestors or a blank set if none
+     */
+    private static Set<Class<?>> getAllInterfaces(Class<?> clazz) {
+        Set<Class<?>> implemented = new HashSet<Class<?>>();
+        getAllInterfaces(clazz, implemented);
+        return implemented;
+    }
+
+    private static void getAllInterfaces(Class<?> clazz, Set<Class<?>> implemented) {
+        Class<?>[] interfaces = clazz.getInterfaces();
+        for (Class<?> interfaze : interfaces) {
+            if (Modifier.isPublic(interfaze.getModifiers())) {
+                implemented.add(interfaze);
+            }
+        }
+        Class<?> superClass = clazz.getSuperclass();
+        // Object has no superclass so check for null
+        if (superClass != null && !superClass.equals(Object.class)) {
+            getAllInterfaces(superClass, implemented);
+        }
+    }
+
+}
diff --git a/java/sca/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/DefaultModuleActivatorExtensionPoint.java b/java/sca/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/DefaultModuleActivatorExtensionPoint.java
new file mode 100644
index 0000000000..8ca030c0dd
--- /dev/null
+++ b/java/sca/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/DefaultModuleActivatorExtensionPoint.java
@@ -0,0 +1,92 @@
+/*
+ * 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;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Set;
+
+import org.apache.tuscany.sca.extensibility.ServiceDeclaration;
+import org.apache.tuscany.sca.extensibility.ServiceDiscovery;
+
+/**
+ * Default implementation of an extension point to hold Tuscany module activators.
+ *
+ * @version $Rev$ $Date$
+ */
+public class DefaultModuleActivatorExtensionPoint implements ModuleActivatorExtensionPoint {
+    private List<ModuleActivator> activators = new ArrayList<ModuleActivator>();
+    private boolean loadedActivators;
+    
+    /**
+     * Constructs a new extension point. 
+     */
+    public DefaultModuleActivatorExtensionPoint() {
+    }
+
+    public void addModuleActivator(ModuleActivator activator) {
+        activators.add(activator);
+    }
+    
+    public List<ModuleActivator> getModuleActivators() {
+        loadModuleActivators();
+        return activators;
+    }
+    
+    public void removeModuleActivator(Object activator) {
+        activators.remove(activator);
+    }
+
+    /**
+     * Dynamically load module activators declared under META-INF/services
+     */
+    private void loadModuleActivators() {
+        if (loadedActivators)
+            return;
+
+        // Get the activator service declarations
+        Set<ServiceDeclaration> activatorDeclarations; 
+        try {
+            activatorDeclarations = ServiceDiscovery.getInstance().getServiceDeclarations(ModuleActivator.class);
+        } catch (IOException e) {
+            throw new IllegalStateException(e);
+        }
+        
+        // Load and instantiate module activators
+        for (ServiceDeclaration activatorDeclaration: activatorDeclarations) {
+            ModuleActivator activator;
+            try {
+                Class<ModuleActivator> activatorClass = (Class<ModuleActivator>)activatorDeclaration.loadClass();
+                activator = activatorClass.newInstance();
+            } catch (ClassNotFoundException e) {
+                throw new IllegalArgumentException(e);
+            } catch (InstantiationException e) {
+                throw new IllegalArgumentException(e);
+            } catch (IllegalAccessException e) {
+                throw new IllegalArgumentException(e);
+            }
+            addModuleActivator(activator);
+        }
+        
+        loadedActivators = true;
+    }
+
+}
diff --git a/java/sca/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/DefaultUtilityExtensionPoint.java b/java/sca/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/DefaultUtilityExtensionPoint.java
new file mode 100644
index 0000000000..6f7c83c8d9
--- /dev/null
+++ b/java/sca/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/DefaultUtilityExtensionPoint.java
@@ -0,0 +1,184 @@
+/*
+ * 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;
+
+import java.io.IOException;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Modifier;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+
+import org.apache.tuscany.sca.extensibility.ServiceDiscovery;
+
+/**
+ * Default implementation of an extension point to hold Tuscany utility utilities.
+ *
+ * @version $Rev$ $Date$
+ */
+public class DefaultUtilityExtensionPoint implements UtilityExtensionPoint {
+    private Map<Class<?>, Object> utilities = new HashMap<Class<?>, Object>();
+    
+    private ExtensionPointRegistry extensionPoints;
+    
+    /**
+     * Constructs a new extension point. 
+     */
+    public DefaultUtilityExtensionPoint(ExtensionPointRegistry extensionPoints) {
+        this.extensionPoints = extensionPoints;
+    }
+
+    /**
+     * Add a utility to the extension point. This default implementation
+     * stores utilities against the interfaces that they implement.
+     *
+     * @param utility The instance of the utility
+     *
+     * @throws IllegalArgumentException if utility is null
+     */
+    public void addUtility(Object utility) {
+        if (utility == null) {
+            throw new IllegalArgumentException("Cannot register null as a Service");
+        }
+
+        Set<Class<?>> interfaces = getAllInterfaces(utility.getClass());
+        for (Class<?> i : interfaces) {
+            utilities.put(i, utility);
+        }
+    }
+    
+    private Constructor<?> getConstructor(Constructor<?>[] constructors, Class<?>[] paramTypes) {
+        for (Constructor<?> c : constructors) {
+            Class<?>[] types = c.getParameterTypes();
+            if (c.getParameterTypes().length == paramTypes.length) {
+                boolean found = true;
+                for (int i = 0; i < types.length; i++) {
+                    if (types[i] != paramTypes[i]) {
+                        found = false;
+                        break;
+                    }
+                }
+                if (found) {
+                    return c;
+                }
+            }
+        }
+        return null;
+    }
+
+    /**
+     * Get the utility by the interface that it implements
+     *
+     * @param utilityType The lookup key (utility interface)
+     * @return The instance of the utility
+     *
+     * @throws IllegalArgumentException if utilityType is null
+     */
+    public <T> T getUtility(Class<T> utilityType) {
+        if (utilityType == null) {
+            throw new IllegalArgumentException("Cannot lookup Service of type null");
+        }
+
+        Object utility = utilities.get(utilityType);
+        if (utility == null) {
+            
+            // Dynamically load a utility class declared under META-INF/utilities           
+            try {
+                Class<?> utilityClass = 
+                	ServiceDiscovery.getInstance().loadFirstServiceClass(utilityType);
+                if (utilityClass != null) {
+                    // Construct the utility
+                    Constructor<?>[] constructors = utilityClass.getConstructors();
+                    Constructor<?> constructor = getConstructor(constructors, new Class<?>[] {ExtensionPointRegistry.class});
+                    if (constructor != null) {
+                        utility = constructor.newInstance(extensionPoints);
+                    } else {
+                        constructor = getConstructor(constructors, new Class<?>[] {});
+                        if (constructor != null) {
+                            utility = constructor.newInstance();
+                        } else {
+                            throw new IllegalArgumentException(
+                                                               "No valid constructor is found for " + utilityClass);
+                        }
+                    }
+                   
+                    // Cache the loaded utility
+                    addUtility(utility);
+                }
+            } catch (InvocationTargetException e) {
+                throw new IllegalArgumentException(e);
+            } catch (IOException e) {
+                throw new IllegalArgumentException(e);
+            } catch (ClassNotFoundException e) {
+                throw new IllegalArgumentException(e);
+            } catch (InstantiationException e) {
+                throw new IllegalArgumentException(e);
+            } catch (IllegalAccessException e) {
+                throw new IllegalArgumentException(e);
+            }
+        }
+        return utilityType.cast(utility);
+    }
+
+    /**
+     * Remove a utility based on the interface that it implements
+     *
+     * @param utility The utility to remove
+     *
+     * @throws IllegalArgumentException if utility is null
+     */
+    public void removeUtility(Object utility) {
+        if (utility == null) {
+            throw new IllegalArgumentException("Cannot remove null as a Service");
+        }
+
+        Set<Class<?>> interfaces = getAllInterfaces(utility.getClass());
+        for (Class<?> i : interfaces) {
+            utilities.remove(i);
+        }
+    }
+
+    /**
+     * Returns the set of interfaces implemented by the given class and its
+     * ancestors or a blank set if none
+     */
+    private static Set<Class<?>> getAllInterfaces(Class<?> clazz) {
+        Set<Class<?>> implemented = new HashSet<Class<?>>();
+        getAllInterfaces(clazz, implemented);
+        return implemented;
+    }
+
+    private static void getAllInterfaces(Class<?> clazz, Set<Class<?>> implemented) {
+        Class<?>[] interfaces = clazz.getInterfaces();
+        for (Class<?> interfaze : interfaces) {
+            if (Modifier.isPublic(interfaze.getModifiers())) {
+                implemented.add(interfaze);
+            }
+        }
+        Class<?> superClass = clazz.getSuperclass();
+        // Object has no superclass so check for null
+        if (superClass != null && !superClass.equals(Object.class)) {
+            getAllInterfaces(superClass, implemented);
+        }
+    }
+
+}
diff --git a/java/sca/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/ExtensionPointRegistry.java b/java/sca/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/ExtensionPointRegistry.java
new file mode 100644
index 0000000000..f2f67b2d52
--- /dev/null
+++ b/java/sca/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/ExtensionPointRegistry.java
@@ -0,0 +1,56 @@
+/*
+ * 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;
+
+
+/**
+ * The registry for the Tuscany core extension points. As the point of contact
+ * for all extension artifacts this registry allows loaded extensions to find
+ * all other parts of the system and register themselves appropriately.
+ *
+ * @version $Rev$ $Date$
+ */
+public interface ExtensionPointRegistry {
+
+    /**
+     * Add an extension point to the registry
+     * @param extensionPoint The instance of the extension point
+     *
+     * @throws IllegalArgumentException if extensionPoint is null
+     */
+    void addExtensionPoint(Object extensionPoint);
+
+    /**
+     * Get the extension point by the interface
+     * @param extensionPointType The lookup key (extension point interface)
+     * @return The instance of the extension point
+     *
+     * @throws IllegalArgumentException if extensionPointType is null
+     */
+    <T> T getExtensionPoint(Class<T> extensionPointType);
+
+    /**
+     * Remove an extension point
+     * @param extensionPoint The extension point to remove
+     *
+     * @throws IllegalArgumentException if extensionPoint is null
+     */
+    void removeExtensionPoint(Object extensionPoint);
+}
diff --git a/java/sca/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/ModuleActivator.java b/java/sca/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/ModuleActivator.java
new file mode 100644
index 0000000000..dbfd0dcd90
--- /dev/null
+++ b/java/sca/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/ModuleActivator.java
@@ -0,0 +1,60 @@
+/*
+ * 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;
+
+
+/**
+ * ModuleActivator represents a module that plugs into the Tuscany system. Each 
+ * module should provide an implementation of this interface and register the 
+ * ModuleActivator implementation class by defining a file named 
+ * 
+ * "META-INF/services/org.apache.tuscany.core.ModuleActivator"
+ * 
+ * The content of the file is the class name of the ModuleActivator implementation. 
+ * The implementation class must have a no-arg constructor. The same instance 
+ * will be used to invoke all the methods during different phases of the module 
+ * activation. Note that the start and stop methods defined by this interface
+ * take a reference to the Tuscany SCA runtime ExtensionPointRegistry. This 
+ * gives the ModuleActivator the opportunity to add extension points to the
+ * registry as it is requested to start up and remove them when it is requested
+ * to shut down.
+ * 
+ * @version $Rev$ $Date$
+ */
+public interface ModuleActivator {
+
+    /**
+     * This method is invoked when the module is started by the Tuscany system.
+     * It can be used by this module to register extensions against extension
+     * points.
+     * 
+     * @param registry The extension point registry
+     */
+    void start(ExtensionPointRegistry registry);
+
+    /**
+     * This method is invoked when the module is stopped by the Tuscany system.
+     * It can be used by this module to unregister extensions against the
+     * extension points.
+     * 
+     * @param registry The extension point registry
+     */
+    void stop(ExtensionPointRegistry registry);
+}
diff --git a/java/sca/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/ModuleActivatorExtensionPoint.java b/java/sca/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/ModuleActivatorExtensionPoint.java
new file mode 100644
index 0000000000..ec0f12b8ba
--- /dev/null
+++ b/java/sca/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/ModuleActivatorExtensionPoint.java
@@ -0,0 +1,53 @@
+/*
+ * 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;
+
+import java.util.List;
+
+
+/**
+ * The extension point for the Tuscany module activator extensions.
+ *
+ * @version $Rev$ $Date$
+ */
+public interface ModuleActivatorExtensionPoint {
+
+    /**
+     * Add a module activator extension to the extension point
+     * @param activator The instance of the module activator
+     *
+     * @throws IllegalArgumentException if activator is null
+     */
+    void addModuleActivator(ModuleActivator activator);
+
+    /**
+     * Returns the module activator extensions.
+     * @return The module activator extensions
+     */
+    List<ModuleActivator> getModuleActivators();
+
+    /**
+     * Remove a module activator
+     * @param activator The module activator to remove
+     *
+     * @throws IllegalArgumentException if activator is null
+     */
+    void removeModuleActivator(Object activator);
+}
diff --git a/java/sca/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/UtilityExtensionPoint.java b/java/sca/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/UtilityExtensionPoint.java
new file mode 100644
index 0000000000..6b14b95666
--- /dev/null
+++ b/java/sca/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/UtilityExtensionPoint.java
@@ -0,0 +1,54 @@
+/*
+ * 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;
+
+
+/**
+ * The extension point for the Tuscany core utility extensions.
+ *
+ * @version $Rev$ $Date$
+ */
+public interface UtilityExtensionPoint {
+
+    /**
+     * Add a utility to the extension point
+     * @param utility The instance of the utility
+     *
+     * @throws IllegalArgumentException if utility is null
+     */
+    void addUtility(Object utility);
+
+    /**
+     * Get the utility by the interface
+     * @param utilityType The lookup key (utility interface)
+     * @return The instance of the utility
+     *
+     * @throws IllegalArgumentException if utilityType is null
+     */
+    <T> T getUtility(Class<T> utilityType);
+
+    /**
+     * Remove a utility
+     * @param utility The utility to remove
+     *
+     * @throws IllegalArgumentException if utility is null
+     */
+    void removeUtility(Object utility);
+}
diff --git a/java/sca/modules/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ServiceDeclaration.java b/java/sca/modules/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ServiceDeclaration.java
new file mode 100644
index 0000000000..4b25f2adc2
--- /dev/null
+++ b/java/sca/modules/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ServiceDeclaration.java
@@ -0,0 +1,136 @@
+/*
+ * 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.extensibility;
+
+import java.lang.ref.WeakReference;
+import java.net.URL;
+import java.util.Map;
+
+/**
+ * Service declaration using J2SE Jar service provider spec Classes specified
+ * inside this declaration are loaded using the ClassLoader used to read the
+ * configuration file corresponding to this declaration.
+ *
+ * @version $Rev$ $Date$
+ */
+public class ServiceDeclaration {
+
+    private WeakReference<ClassLoader> classLoader;
+
+    private String className;
+
+    private Map<String, String> attributes;
+
+    /**
+     * Service declaration constructor
+     * 
+     * @param className Service implementation class name
+     * @param classLoader ClassLoader corresponding to this service
+     *                implementation
+     * @param attributes Optional attributes for this service declaration
+     */
+    public ServiceDeclaration(String className, ClassLoader classLoader, Map<String, String> attributes) {
+
+        this.className = className;
+        this.classLoader = new WeakReference<ClassLoader>(classLoader);
+        this.attributes = attributes;
+    }
+
+    /**
+     * Load this service implementation class
+     * 
+     * @return Class
+     * @throws ClassNotFoundException
+     */
+    @SuppressWarnings("unchecked")
+    public Class<?> loadClass() throws ClassNotFoundException {
+
+        return Class.forName(className, true, classLoader.get());
+    }
+
+    /**
+     * Load another class using the ClassLoader of this service implementation
+     * 
+     * @param anotherClassName
+     * @return Class
+     * @throws ClassNotFoundException
+     */
+    public Class<?> loadClass(String anotherClassName) throws ClassNotFoundException {
+
+        return Class.forName(anotherClassName, true, classLoader.get());
+    }
+
+    /**
+     * Return the resource corresponding to this service implementation class
+     * 
+     * @return resource URL
+     */
+    public URL getResource() {
+        return classLoader.get().getResource(className);
+    }
+
+    /**
+     * ClassLoader associated with this service declaration
+     * 
+     * @return ClassLoader
+     */
+    public ClassLoader getClassLoader() {
+        return classLoader.get();
+    }
+
+    /**
+     * Service implementation class corresponding to this declaration
+     * 
+     * @return The Service implementation class corresponding to this declaration 
+     */
+    public String getClassName() {
+        return className;
+    }
+
+    /**
+     * Attributes specified for this declaration
+     * 
+     * @return attributes
+     */
+    public Map<String, String> getAttributes() {
+        return attributes;
+    }
+
+    /**
+     * Equals method used to ensure that each service declaration is stored only
+     * once in a set of declarations.
+     */
+    @Override
+    public boolean equals(Object o) {
+        if (!(o instanceof ServiceDeclaration))
+            return false;
+        ServiceDeclaration s = (ServiceDeclaration)o;
+        if (!className.equals(s.className))
+            return false;
+        else if (!classLoader.equals(s.classLoader))
+            return false;
+        else if (attributes == null)
+            return s.attributes == null;
+        else
+            return attributes.equals(s.attributes);
+
+    }
+
+}
diff --git a/java/sca/modules/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ServiceDiscovery.java b/java/sca/modules/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ServiceDiscovery.java
new file mode 100644
index 0000000000..fcf7843fa9
--- /dev/null
+++ b/java/sca/modules/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ServiceDiscovery.java
@@ -0,0 +1,310 @@
+/*
+ * 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.extensibility;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.net.URL;
+import java.security.AccessController;
+import java.security.PrivilegedActionException;
+import java.security.PrivilegedExceptionAction;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Hashtable;
+import java.util.Map;
+import java.util.Set;
+import java.util.StringTokenizer;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+/**
+ * Service discovery for Tuscany based on J2SE Jar service provider spec.
+ * Services are described using configuration files in META-INF/services.
+ * Service description specifies a class name followed by optional properties.
+ * Multi-ClassLoader environments are supported through a ClassLoader
+ * registration API
+ *
+ * @version $Rev$ $Date$
+ */
+public class ServiceDiscovery {
+    private static final Logger logger = Logger.getLogger(ServiceDiscovery.class.getName());
+
+    private static ServiceDiscovery instance;
+
+    private HashSet<ClassLoader> registeredClassLoaders;
+
+    /**
+     * Get an instance of Service discovery, one instance is created per
+     * ClassLoader that this class is loaded from
+     * 
+     * @return
+     */
+    public static ServiceDiscovery getInstance() {
+
+        if (instance == null) {
+            instance = new ServiceDiscovery();
+            instance.registeredClassLoaders = new HashSet<ClassLoader>();
+            instance.registeredClassLoaders.add(ServiceDiscovery.class.getClassLoader());
+        }
+        return instance;
+    }
+
+    /**
+     * Register a ClassLoader with this discovery mechanism. Tuscany extension
+     * ClassLoaders are registered here.
+     * 
+     * @param classLoader
+     */
+    public synchronized void registerClassLoader(ClassLoader classLoader) {
+        registeredClassLoaders.add(classLoader);
+    }
+    
+    /**
+     * Unregister a ClassLoader with this discovery mechanism. 
+     * 
+     * @param classLoader
+     */
+    public synchronized void unregisterClassLoader(ClassLoader classLoader) {
+        registeredClassLoaders.remove(classLoader);
+    }
+
+    /**
+     * Get all service declarations for this name
+     * 
+     * @param name
+     * @return set of service declarations
+     * @throws IOException
+     */
+    public Set<ServiceDeclaration> getServiceDeclarations(String name) throws IOException {
+
+        Set<ServiceDeclaration> classSet = new HashSet<ServiceDeclaration>();
+
+        for (ClassLoader classLoader : registeredClassLoaders) {
+            getServiceClasses(classLoader, name, classSet, true);
+        }
+        return classSet;
+    }
+
+    /**
+     * Get all service declarations for this interface
+     * 
+     * @param serviceInterface
+     * @return set of service declarations
+     * @throws IOException
+     */
+    public Set<ServiceDeclaration> getServiceDeclarations(Class<?> serviceInterface) throws IOException {
+
+        return getServiceDeclarations(serviceInterface.getName());
+    }
+
+    /**
+     * Load one service implementation class for this interface
+     * 
+     * @param serviceInterface
+     * @return service implementation class
+     * @throws IOException
+     * @throws ClassNotFoundException
+     */
+    public Class<?> loadFirstServiceClass(Class<?> serviceInterface) throws IOException, ClassNotFoundException {
+
+        Set<ServiceDeclaration> classSet = new HashSet<ServiceDeclaration>();
+
+        for (ClassLoader classLoader : registeredClassLoaders) {
+            getServiceClasses(classLoader, serviceInterface.getName(), classSet, false);
+            if (classSet.size() > 0)
+                break;
+        }
+        if (classSet.size() > 0)
+            return classSet.iterator().next().loadClass();
+        else
+            return null;
+
+    }
+
+    /**
+     * Returns a unique list of resource URLs of name META-INF/services/<name>
+     * Each URL is associated with the first ClassLoader that it was visible
+     * from
+     * 
+     * @param name Name of resource
+     * @return Table of URLs with associated ClassLoaders
+     * @throws IOException
+     */
+    public Hashtable<ClassLoader, Set<URL>> getServiceResources(final String name) throws IOException {
+
+        Hashtable<ClassLoader, Set<URL>> resourceTable = new Hashtable<ClassLoader, Set<URL>>();
+
+        HashSet<URL> allURLs = new HashSet<URL>();
+        for (final ClassLoader classLoader : registeredClassLoaders) {
+            HashSet<URL> urls = new HashSet<URL>();
+            resourceTable.put(classLoader, urls);
+            boolean debug = logger.isLoggable(Level.FINE);
+            if (debug) {
+                logger.fine("Discovering service resources using class loader " + classLoader);
+            }
+            // Allow privileged access to read META-INF/services/*. Add FilePermission to added to security policy file.
+            ArrayList<URL> urlList;
+            try {
+                // FIXME J2 Security - promote this to callers of this method
+                urlList = AccessController.doPrivileged(new PrivilegedExceptionAction<ArrayList<URL>>() {
+                    public ArrayList<URL> run() throws IOException {
+                        return Collections.list(classLoader.getResources("META-INF/services/" + name));
+                    }
+                });
+            } catch (PrivilegedActionException e) {
+                throw (IOException)e.getException();
+            }
+            
+            for (URL url : urlList) {
+                if (allURLs.contains(url))
+                    continue;
+                urls.add(url);
+            }
+            allURLs.addAll(urls);
+        }
+        return resourceTable;
+    }
+
+    /**
+     * Parse a service declaration in the form class;attr=value,attr=value and
+     * return a map of attributes
+     * 
+     * @param declaration
+     * @return a map of attributes
+     */
+    private Map<String, String> parseServiceDeclaration(String declaration) {
+        Map<String, String> attributes = new HashMap<String, String>();
+        int index = declaration.indexOf(';');
+        if (index != -1) {
+            attributes.put("class", declaration.substring(0, index).trim());
+            declaration = declaration.substring(index);
+        } else {
+            int j = declaration.indexOf('=');
+            if (j == -1) {
+                attributes.put("class", declaration.trim());
+                return attributes;
+            } else {
+                declaration = ";" + declaration;
+            }
+        }
+        StringTokenizer tokens = new StringTokenizer(declaration);
+        for (; tokens.hasMoreTokens();) {
+            String key = tokens.nextToken("=").substring(1).trim();
+            if (key == null)
+                break;
+            String value = tokens.nextToken(",").substring(1).trim();
+            if (value == null)
+                break;
+            attributes.put(key, value);
+        }
+        return attributes;
+    }
+
+    /**
+     * Load the service class whose name specified in a configuration file
+     * 
+     * @param classLoader
+     * @param name The name of the service class
+     * @param classSet Populate this set with classes extends/implements the
+     *                service class
+     * @throws IOException
+     */
+    private void getServiceClasses(final ClassLoader classLoader,
+                                   final String name,
+                                   Set<ServiceDeclaration> classSet,
+                                   boolean findAllClasses) throws IOException {
+
+        boolean debug = logger.isLoggable(Level.FINE);
+        if (debug) {
+            logger.fine("Discovering service providers using class loader " + classLoader);
+        }
+        // Allow privileged access to read META-INF/services/*. Add FilePermission to added to
+        // security policy file.
+        ArrayList<URL> urlList;
+        try {
+            urlList = AccessController.doPrivileged(new PrivilegedExceptionAction<ArrayList<URL>>() {
+                public ArrayList<URL> run() throws IOException {
+                    return Collections.list(classLoader.getResources("META-INF/services/" + name));
+                }
+            });
+        } catch (PrivilegedActionException e) {
+            throw (IOException)e.getException();
+        }
+        
+        for (final URL url : urlList) {
+            if (debug) {
+                logger.fine("Reading service provider file: " + url.toExternalForm());
+            }
+
+            // Allow privileged access to open URL stream. Add FilePermission to added to security
+            // policy file.
+            InputStream is;
+            try {
+                is = AccessController.doPrivileged(new PrivilegedExceptionAction<InputStream>() {
+                    public InputStream run() throws IOException {
+                        return url.openStream();
+                    }
+                });
+            } catch (PrivilegedActionException e) {
+                throw (IOException)e.getException();
+            }
+            BufferedReader reader = null;
+            try {
+                reader = new BufferedReader(new InputStreamReader(is));
+                while (true) {
+                    String line = reader.readLine();
+                    if (line == null)
+                        break;
+                    line = line.trim();
+                    if (!line.startsWith("#") && !"".equals(line)) {
+                        String reg = line.trim();
+                        if (debug) {
+                            logger.fine("Registering service provider: " + reg);
+                        }
+
+                        Map<String, String> attributes = parseServiceDeclaration(reg);
+                        String className = attributes.get("class");
+                        ServiceDeclaration serviceClass = new ServiceDeclaration(className, classLoader, attributes);
+                        classSet.add(serviceClass);
+
+                        if (!findAllClasses)
+                            break;
+                    }
+                }
+            } finally {
+                if (reader != null)
+                    reader.close();
+                if (is != null) {
+                    try {
+                        is.close();
+                    } catch (IOException ioe) {
+                    }
+                }
+            }
+            if (!findAllClasses && classSet.size() > 0)
+                break;
+        }
+    }
+
+}
diff --git a/java/sca/modules/extensibility/src/main/resources/META-INF/services/org.apache.tuscany.sca.core.ModuleActivatorExtensionPoint b/java/sca/modules/extensibility/src/main/resources/META-INF/services/org.apache.tuscany.sca.core.ModuleActivatorExtensionPoint
new file mode 100644
index 0000000000..42bad63132
--- /dev/null
+++ b/java/sca/modules/extensibility/src/main/resources/META-INF/services/org.apache.tuscany.sca.core.ModuleActivatorExtensionPoint
@@ -0,0 +1,18 @@
+# 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. 

+

+org.apache.tuscany.sca.core.DefaultModuleActivatorExtensionPoint

diff --git a/java/sca/modules/extensibility/src/main/resources/META-INF/services/org.apache.tuscany.sca.core.UtilityExtensionPoint b/java/sca/modules/extensibility/src/main/resources/META-INF/services/org.apache.tuscany.sca.core.UtilityExtensionPoint
new file mode 100644
index 0000000000..d769bad283
--- /dev/null
+++ b/java/sca/modules/extensibility/src/main/resources/META-INF/services/org.apache.tuscany.sca.core.UtilityExtensionPoint
@@ -0,0 +1,18 @@
+# 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. 

+

+org.apache.tuscany.sca.core.DefaultUtilityExtensionPoint