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-rw-r--r--sandbox/event/modules/extensibility/LICENSE205
-rw-r--r--sandbox/event/modules/extensibility/NOTICE5
-rw-r--r--sandbox/event/modules/extensibility/pom.xml50
-rw-r--r--sandbox/event/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/DefaultExtensionPointRegistry.java184
-rw-r--r--sandbox/event/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/DefaultModuleActivatorExtensionPoint.java92
-rw-r--r--sandbox/event/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/DefaultUtilityExtensionPoint.java184
-rw-r--r--sandbox/event/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/ExtensionPointRegistry.java56
-rw-r--r--sandbox/event/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/ModuleActivator.java60
-rw-r--r--sandbox/event/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/ModuleActivatorExtensionPoint.java53
-rw-r--r--sandbox/event/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/UtilityExtensionPoint.java54
-rw-r--r--sandbox/event/modules/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ContextClassLoaderServiceDiscoverer.java248
-rw-r--r--sandbox/event/modules/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ServiceDeclaration.java68
-rw-r--r--sandbox/event/modules/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ServiceDiscoverer.java37
-rw-r--r--sandbox/event/modules/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ServiceDiscovery.java170
-rw-r--r--sandbox/event/modules/extensibility/src/main/resources/META-INF/services/org.apache.tuscany.sca.core.ModuleActivatorExtensionPoint18
-rw-r--r--sandbox/event/modules/extensibility/src/main/resources/META-INF/services/org.apache.tuscany.sca.core.UtilityExtensionPoint18
-rw-r--r--sandbox/event/modules/extensibility/src/test/java/org/apache/tuscany/sca/extensibility/ContextClassLoaderServiceDiscovererTestCase.java72
17 files changed, 1574 insertions, 0 deletions
diff --git a/sandbox/event/modules/extensibility/LICENSE b/sandbox/event/modules/extensibility/LICENSE
new file mode 100644
index 0000000000..8aa906c321
--- /dev/null
+++ b/sandbox/event/modules/extensibility/LICENSE
@@ -0,0 +1,205 @@
+
+ Apache License
+ Version 2.0, January 2004
+ http://www.apache.org/licenses/
+
+ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+ 1. Definitions.
+
+ "License" shall mean the terms and conditions for use, reproduction,
+ and distribution as defined by Sections 1 through 9 of this document.
+
+ "Licensor" shall mean the copyright owner or entity authorized by
+ the copyright owner that is granting the License.
+
+ "Legal Entity" shall mean the union of the acting entity and all
+ other entities that control, are controlled by, or are under common
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+ direction or management of such entity, whether by contract or
+ otherwise, or (ii) ownership of fifty percent (50%) or more of the
+ outstanding shares, or (iii) beneficial ownership of such entity.
+
+ "You" (or "Your") shall mean an individual or Legal Entity
+ exercising permissions granted by this License.
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+ "Source" form shall mean the preferred form for making modifications,
+ including but not limited to software source code, documentation
+ source, and configuration files.
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+ "Object" form shall mean any form resulting from mechanical
+ transformation or translation of a Source form, including but
+ not limited to compiled object code, generated documentation,
+ and conversions to other media types.
+
+ "Work" shall mean the work of authorship, whether in Source or
+ Object form, made available under the License, as indicated by a
+ copyright notice that is included in or attached to the work
+ (an example is provided in the Appendix below).
+
+ "Derivative Works" shall mean any work, whether in Source or Object
+ form, that is based on (or derived from) the Work and for which the
+ editorial revisions, annotations, elaborations, or other modifications
+ represent, as a whole, an original work of authorship. For the purposes
+ of this License, Derivative Works shall not include works that remain
+ separable from, or merely link (or bind by name) to the interfaces of,
+ the Work and Derivative Works thereof.
+
+ "Contribution" shall mean any work of authorship, including
+ the original version of the Work and any modifications or additions
+ to that Work or Derivative Works thereof, that is intentionally
+ submitted to Licensor for inclusion in the Work by the copyright owner
+ or by an individual or Legal Entity authorized to submit on behalf of
+ the copyright owner. For the purposes of this definition, "submitted"
+ means any form of electronic, verbal, or written communication sent
+ to the Licensor or its representatives, including but not limited to
+ communication on electronic mailing lists, source code control systems,
+ and issue tracking systems that are managed by, or on behalf of, the
+ Licensor for the purpose of discussing and improving the Work, but
+ excluding communication that is conspicuously marked or otherwise
+ designated in writing by the copyright owner as "Not a Contribution."
+
+ "Contributor" shall mean Licensor and any individual or Legal Entity
+ on behalf of whom a Contribution has been received by Licensor and
+ subsequently incorporated within the Work.
+
+ 2. Grant of Copyright License. Subject to the terms and conditions of
+ this License, each Contributor hereby grants to You a perpetual,
+ worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+ copyright license to reproduce, prepare Derivative Works of,
+ publicly display, publicly perform, sublicense, and distribute the
+ Work and such Derivative Works in Source or Object form.
+
+ 3. Grant of Patent License. Subject to the terms and conditions of
+ this License, each Contributor hereby grants to You a perpetual,
+ worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+ (except as stated in this section) patent license to make, have made,
+ use, offer to sell, sell, import, and otherwise transfer the Work,
+ where such license applies only to those patent claims licensable
+ by such Contributor that are necessarily infringed by their
+ Contribution(s) alone or by combination of their Contribution(s)
+ with the Work to which such Contribution(s) was submitted. If You
+ institute patent litigation against any entity (including a
+ cross-claim or counterclaim in a lawsuit) alleging that the Work
+ or a Contribution incorporated within the Work constitutes direct
+ or contributory patent infringement, then any patent licenses
+ granted to You under this License for that Work shall terminate
+ as of the date such litigation is filed.
+
+ 4. Redistribution. You may reproduce and distribute copies of the
+ Work or Derivative Works thereof in any medium, with or without
+ modifications, and in Source or Object form, provided that You
+ meet the following conditions:
+
+ (a) You must give any other recipients of the Work or
+ Derivative Works a copy of this License; and
+
+ (b) You must cause any modified files to carry prominent notices
+ stating that You changed the files; and
+
+ (c) You must retain, in the Source form of any Derivative Works
+ that You distribute, all copyright, patent, trademark, and
+ attribution notices from the Source form of the Work,
+ excluding those notices that do not pertain to any part of
+ the Derivative Works; and
+
+ (d) If the Work includes a "NOTICE" text file as part of its
+ distribution, then any Derivative Works that You distribute must
+ include a readable copy of the attribution notices contained
+ within such NOTICE file, excluding those notices that do not
+ pertain to any part of the Derivative Works, in at least one
+ of the following places: within a NOTICE text file distributed
+ as part of the Derivative Works; within the Source form or
+ documentation, if provided along with the Derivative Works; or,
+ within a display generated by the Derivative Works, if and
+ wherever such third-party notices normally appear. The contents
+ of the NOTICE file are for informational purposes only and
+ do not modify the License. You may add Your own attribution
+ notices within Derivative Works that You distribute, alongside
+ or as an addendum to the NOTICE text from the Work, provided
+ that such additional attribution notices cannot be construed
+ as modifying the License.
+
+ You may add Your own copyright statement to Your modifications and
+ may provide additional or different license terms and conditions
+ for use, reproduction, or distribution of Your modifications, or
+ for any such Derivative Works as a whole, provided Your use,
+ reproduction, and distribution of the Work otherwise complies with
+ the conditions stated in this License.
+
+ 5. Submission of Contributions. Unless You explicitly state otherwise,
+ 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.
+ Notwithstanding the above, nothing herein shall supersede or modify
+ the terms of any separate license agreement you may have executed
+ with Licensor regarding such Contributions.
+
+ 6. Trademarks. This License does not grant permission to use the trade
+ names, trademarks, service marks, or product names of the Licensor,
+ except as required for reasonable and customary use in describing the
+ origin of the Work and reproducing the content of the NOTICE file.
+
+ 7. Disclaimer of Warranty. Unless required by applicable law or
+ agreed to in writing, Licensor provides the Work (and each
+ Contributor provides its Contributions) on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+ implied, including, without limitation, any warranties or conditions
+ of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+ PARTICULAR PURPOSE. You are solely responsible for determining the
+ appropriateness of using or redistributing the Work and assume any
+ risks associated with Your exercise of permissions under this License.
+
+ 8. Limitation of Liability. In no event and under no legal theory,
+ whether in tort (including negligence), contract, or otherwise,
+ unless required by applicable law (such as deliberate and grossly
+ negligent acts) or agreed to in writing, shall any Contributor be
+ liable to You for damages, including any direct, indirect, special,
+ incidental, or consequential damages of any character arising as a
+ result of this License or out of the use or inability to use the
+ Work (including but not limited to damages for loss of goodwill,
+ work stoppage, computer failure or malfunction, or any and all
+ other commercial damages or losses), even if such Contributor
+ has been advised of the possibility of such damages.
+
+ 9. Accepting Warranty or Additional Liability. While redistributing
+ the Work or Derivative Works thereof, You may choose to offer,
+ and charge a fee for, acceptance of support, warranty, indemnity,
+ or other liability obligations and/or rights consistent with this
+ License. However, in accepting such obligations, You may act only
+ on Your own behalf and on Your sole responsibility, not on behalf
+ of any other Contributor, and only if You agree to indemnify,
+ defend, and hold each Contributor harmless for any liability
+ incurred by, or claims asserted against, such Contributor by reason
+ of your accepting any such warranty or additional liability.
+
+ END OF TERMS AND CONDITIONS
+
+ APPENDIX: How to apply the Apache License to your work.
+
+ To apply the Apache License to your work, attach the following
+ boilerplate notice, with the fields enclosed by brackets "[]"
+ replaced with your own identifying information. (Don't include
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+ file or class name and description of purpose be included on the
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+ Copyright [yyyy] [name of copyright owner]
+
+ Licensed 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.
+
+
+
diff --git a/sandbox/event/modules/extensibility/NOTICE b/sandbox/event/modules/extensibility/NOTICE
new file mode 100644
index 0000000000..b3e4797aaa
--- /dev/null
+++ b/sandbox/event/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/sandbox/event/modules/extensibility/pom.xml b/sandbox/event/modules/extensibility/pom.xml
new file mode 100644
index 0000000000..01cd2d0ca9
--- /dev/null
+++ b/sandbox/event/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/sandbox/event/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/DefaultExtensionPointRegistry.java b/sandbox/event/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/DefaultExtensionPointRegistry.java
new file mode 100644
index 0000000000..48f240559c
--- /dev/null
+++ b/sandbox/event/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/sandbox/event/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/DefaultModuleActivatorExtensionPoint.java b/sandbox/event/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/DefaultModuleActivatorExtensionPoint.java
new file mode 100644
index 0000000000..8ca030c0dd
--- /dev/null
+++ b/sandbox/event/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/sandbox/event/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/DefaultUtilityExtensionPoint.java b/sandbox/event/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/DefaultUtilityExtensionPoint.java
new file mode 100644
index 0000000000..6f7c83c8d9
--- /dev/null
+++ b/sandbox/event/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/sandbox/event/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/ExtensionPointRegistry.java b/sandbox/event/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/ExtensionPointRegistry.java
new file mode 100644
index 0000000000..f2f67b2d52
--- /dev/null
+++ b/sandbox/event/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/sandbox/event/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/ModuleActivator.java b/sandbox/event/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/ModuleActivator.java
new file mode 100644
index 0000000000..dbfd0dcd90
--- /dev/null
+++ b/sandbox/event/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/sandbox/event/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/ModuleActivatorExtensionPoint.java b/sandbox/event/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/ModuleActivatorExtensionPoint.java
new file mode 100644
index 0000000000..ec0f12b8ba
--- /dev/null
+++ b/sandbox/event/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/sandbox/event/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/UtilityExtensionPoint.java b/sandbox/event/modules/extensibility/src/main/java/org/apache/tuscany/sca/core/UtilityExtensionPoint.java
new file mode 100644
index 0000000000..6b14b95666
--- /dev/null
+++ b/sandbox/event/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/sandbox/event/modules/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ContextClassLoaderServiceDiscoverer.java b/sandbox/event/modules/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ContextClassLoaderServiceDiscoverer.java
new file mode 100644
index 0000000000..2e11234095
--- /dev/null
+++ b/sandbox/event/modules/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ContextClassLoaderServiceDiscoverer.java
@@ -0,0 +1,248 @@
+/*
+ * 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.lang.ref.WeakReference;
+import java.net.URL;
+import java.net.URLConnection;
+import java.security.AccessController;
+import java.security.PrivilegedAction;
+import java.security.PrivilegedActionException;
+import java.security.PrivilegedExceptionAction;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.StringTokenizer;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+/**
+ * A ServiceDiscoverer that find META-INF/services/... using the Context ClassLoader.
+ *
+ * @version $Rev: $ $Date: $
+ */
+public class ContextClassLoaderServiceDiscoverer implements ServiceDiscoverer {
+ private static final Logger logger = Logger.getLogger(ContextClassLoaderServiceDiscoverer.class.getName());
+
+ public class ServiceDeclarationImpl implements ServiceDeclaration {
+ private URL url;
+ private String className;
+ private Class<?> javaClass;
+ private Map<String, String> attributes;
+
+ public ServiceDeclarationImpl(URL url, String className, Map<String, String> attributes) {
+ super();
+ this.url = url;
+ this.className = className;
+ this.attributes = attributes;
+ }
+
+ public Map<String, String> getAttributes() {
+ return attributes;
+ }
+
+ public String getClassName() {
+ return className;
+ }
+
+ public URL getLocation() {
+ return url;
+ }
+
+ public Class<?> loadClass() throws ClassNotFoundException {
+ if (className == null) {
+ return null;
+ }
+ if (javaClass == null) {
+ javaClass = loadClass(className);
+ }
+ return javaClass;
+ }
+
+ public Class<?> loadClass(String className) throws ClassNotFoundException {
+ return classLoaderReference.get().loadClass(className);
+ }
+
+ public String toString() {
+ StringBuffer sb = new StringBuffer();
+ sb.append("ClassLoader: ").append(classLoaderReference.get());
+ sb.append(" Attributes: ").append(attributes);
+ return sb.toString();
+ }
+
+ public URL getResource(final String name) {
+ return AccessController.doPrivileged(new PrivilegedAction<URL>() {
+ public URL run() {
+ return classLoaderReference.get().getResource(name);
+ }
+ });
+ }
+
+ }
+
+ private WeakReference<ClassLoader> classLoaderReference;
+
+ public ContextClassLoaderServiceDiscoverer() {
+ ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
+ this.classLoaderReference = new WeakReference<ClassLoader>(classLoader);
+ }
+
+ private List<URL> getResources(final String name, final boolean firstOnly) throws IOException {
+ try {
+ return AccessController.doPrivileged(new PrivilegedExceptionAction<List<URL>>() {
+ public List<URL> run() throws IOException {
+ if (firstOnly) {
+ URL url = classLoaderReference.get().getResource(name);
+ if (url != null) {
+ return Arrays.asList(url);
+ } else {
+ return Collections.emptyList();
+ }
+ } else {
+ List<URL> urls = Collections.list(classLoaderReference.get().getResources(name));
+ return urls;
+ }
+ }
+ });
+ } catch (PrivilegedActionException e) {
+ throw (IOException)e.getException();
+ }
+ }
+
+ /**
+ * 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 static 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;
+ }
+
+ public Set<ServiceDeclaration> discover(String serviceName, boolean firstOnly) {
+ Set<ServiceDeclaration> descriptors = new HashSet<ServiceDeclaration>();
+
+ String name = "META-INF/services/" + serviceName;
+ boolean debug = logger.isLoggable(Level.FINE);
+ try {
+ for (final URL url : getResources(name, firstOnly)) {
+ 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 {
+ URLConnection connection = url.openConnection();
+ // TUSCANY-2539
+ // Don't cache connections by default to stop Tuscany locking contribution jar files
+ // done here as this is one of the first places we open a stream and the only way to
+ // set the default is to set it on an instance of URLConnection
+ connection.setDefaultUseCaches(false);
+ connection.setUseCaches(false);
+ return url.openStream();
+ }
+ });
+ } catch (PrivilegedActionException e) {
+ throw (IOException)e.getException();
+ }
+ BufferedReader reader = null;
+ try {
+ reader = new BufferedReader(new InputStreamReader(is));
+ int count = 0;
+ 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");
+ if (className == null) {
+ // Add a unique class name to prevent equals() from returning true
+ className = "_class_" + count;
+ count++;
+ }
+ ServiceDeclarationImpl descriptor = new ServiceDeclarationImpl(url, className, attributes);
+ descriptors.add(descriptor);
+ if (firstOnly) {
+ return descriptors;
+ }
+ }
+ }
+ } finally {
+ if (reader != null) {
+ try {
+ reader.close();
+ } catch (IOException e) {
+ // Ignore
+ }
+ }
+ }
+ }
+ } catch (IOException e) {
+ logger.log(Level.SEVERE, e.getMessage(), e);
+ }
+ return descriptors;
+
+ }
+
+}
diff --git a/sandbox/event/modules/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ServiceDeclaration.java b/sandbox/event/modules/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ServiceDeclaration.java
new file mode 100644
index 0000000000..403b6aa7a7
--- /dev/null
+++ b/sandbox/event/modules/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ServiceDeclaration.java
@@ -0,0 +1,68 @@
+/*
+ * 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.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 interface ServiceDeclaration {
+ /**
+ * Load a java class in the same context as the service definition
+ * @param className The class name
+ * @return The loaded class
+ * @throws ClassNotFoundException
+ */
+ Class<?> loadClass(String className) throws ClassNotFoundException;
+ /**
+ * Get the java class for the service impl
+ * @return The java class
+ */
+ Class<?> loadClass() throws ClassNotFoundException;
+ /**
+ * Get all attributes (name=value pairs) defined for the given entry
+ * @return All attributes keyed by name
+ */
+ Map<String, String> getAttributes();
+
+ URL getLocation();
+
+ String getClassName();
+
+ URL getResource(String name);
+
+ /**
+ * The service descriptor might be hashed
+ * @param obj Another object
+ * @return
+ */
+ boolean equals(Object obj);
+ /**
+ * The service descriptor might be hashed
+ * @return
+ */
+ int hashCode();
+}
diff --git a/sandbox/event/modules/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ServiceDiscoverer.java b/sandbox/event/modules/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ServiceDiscoverer.java
new file mode 100644
index 0000000000..1722cd5f49
--- /dev/null
+++ b/sandbox/event/modules/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ServiceDiscoverer.java
@@ -0,0 +1,37 @@
+/*
+ * 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.util.Set;
+
+/**
+ * A SPI that allows different implementations of discovering service declarations
+ */
+public interface ServiceDiscoverer {
+ /**
+ * Discover the service descriptors by name
+ * @param serviceName The name of the service
+ * @param firstOnly A flag to indicate if only the first instance is to be discovered
+ *
+ * @return A set of service descriptors
+ */
+ Set<ServiceDeclaration> discover(String serviceName, boolean firstOnly);
+
+}
diff --git a/sandbox/event/modules/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ServiceDiscovery.java b/sandbox/event/modules/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ServiceDiscovery.java
new file mode 100644
index 0000000000..ce41a44068
--- /dev/null
+++ b/sandbox/event/modules/extensibility/src/main/java/org/apache/tuscany/sca/extensibility/ServiceDiscovery.java
@@ -0,0 +1,170 @@
+/*
+ * 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.IOException;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.security.AccessController;
+import java.security.PrivilegedAction;
+import java.util.HashSet;
+import java.util.Set;
+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.
+ *
+ *
+ * @version $Rev$ $Date$
+ */
+public class ServiceDiscovery {
+ private static final Logger logger = Logger.getLogger(ServiceDiscovery.class.getName());
+
+ private final static ServiceDiscovery INSTANCE = new ServiceDiscovery();
+
+ private ServiceDiscoverer discoverer;
+ private Set<ClassLoader> registeredClassLoaders = new HashSet<ClassLoader>();
+
+ /**
+ * Get an instance of Service discovery, one instance is created per
+ * ClassLoader that this class is loaded from
+ *
+ * @return
+ */
+ public static ServiceDiscovery getInstance() {
+ return INSTANCE;
+ }
+
+ public ServiceDiscoverer getServiceDiscoverer() {
+ if (discoverer == null) {
+ discoverer = new ContextClassLoaderServiceDiscoverer();
+ }
+ return discoverer;
+ }
+
+ public void setServiceDiscoverer(ServiceDiscoverer sd) {
+ if (discoverer != null) {
+ throw new IllegalStateException("The ServiceDiscoverer cannot be reset");
+ }
+ discoverer = sd;
+ }
+
+ /**
+ * @deprecated
+ * Register a ClassLoader with this discovery mechanism. Tuscany extension
+ * ClassLoaders are registered here.
+ *
+ * @param classLoader
+ */
+ @Deprecated
+ public synchronized void registerClassLoader(ClassLoader classLoader) {
+ registeredClassLoaders.add(classLoader);
+ }
+
+ /**
+ * @deprecated
+ * Unregister a ClassLoader with this discovery mechanism.
+ *
+ * @param classLoader
+ */
+ @Deprecated
+ 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> services = getServiceDiscoverer().discover(name, false);
+ return services;
+ }
+
+ /**
+ * 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(final Class<?> serviceInterface) throws IOException, ClassNotFoundException {
+ // Try System property first
+ String className = AccessController.doPrivileged(new PrivilegedAction<String>() {
+ public String run() {
+ return System.getProperty(serviceInterface.getName());
+ }
+ });
+ if (className != null) {
+ try {
+ // Try the classloader for the service interface first
+ return Class.forName(className, false, serviceInterface.getClassLoader());
+ } catch (ClassNotFoundException e) {
+ try {
+ // Try the thread context classloader
+ return Class.forName(className, false, Thread.currentThread().getContextClassLoader());
+ } catch (ClassNotFoundException ex) {
+ logger.log(Level.WARNING, ex.getMessage(), ex);
+ }
+ }
+ }
+ Set<ServiceDeclaration> services = getServiceDiscoverer().discover(serviceInterface.getName(), true);
+ if (services.isEmpty()) {
+ return null;
+ }
+ return services.iterator().next().loadClass();
+ }
+
+ /**
+ * Create a new instance of a factory service class.
+ *
+ * @param serviceInterface
+ * @return service implementation class
+ * @throws SecurityException
+ * @throws NoSuchMethodException
+ * @throws InvocationTargetException
+ * @throws IllegalAccessException
+ */
+ public Object newFactoryClassInstance(final Class<?> serviceInterface) throws SecurityException, NoSuchMethodException, InvocationTargetException, IllegalAccessException {
+ Method newInstanceMethod = serviceInterface.getMethod("newInstance");
+ Object factory = newInstanceMethod.invoke(null);
+ return factory;
+ }
+
+}
diff --git a/sandbox/event/modules/extensibility/src/main/resources/META-INF/services/org.apache.tuscany.sca.core.ModuleActivatorExtensionPoint b/sandbox/event/modules/extensibility/src/main/resources/META-INF/services/org.apache.tuscany.sca.core.ModuleActivatorExtensionPoint
new file mode 100644
index 0000000000..42bad63132
--- /dev/null
+++ b/sandbox/event/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/sandbox/event/modules/extensibility/src/main/resources/META-INF/services/org.apache.tuscany.sca.core.UtilityExtensionPoint b/sandbox/event/modules/extensibility/src/main/resources/META-INF/services/org.apache.tuscany.sca.core.UtilityExtensionPoint
new file mode 100644
index 0000000000..d769bad283
--- /dev/null
+++ b/sandbox/event/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
diff --git a/sandbox/event/modules/extensibility/src/test/java/org/apache/tuscany/sca/extensibility/ContextClassLoaderServiceDiscovererTestCase.java b/sandbox/event/modules/extensibility/src/test/java/org/apache/tuscany/sca/extensibility/ContextClassLoaderServiceDiscovererTestCase.java
new file mode 100644
index 0000000000..fd508402fc
--- /dev/null
+++ b/sandbox/event/modules/extensibility/src/test/java/org/apache/tuscany/sca/extensibility/ContextClassLoaderServiceDiscovererTestCase.java
@@ -0,0 +1,72 @@
+/*
+ * 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.util.Set;
+
+import junit.framework.Assert;
+
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+/**
+ * Test Case for ClasspathServiceDiscover
+ */
+public class ContextClassLoaderServiceDiscovererTestCase {
+ private static ContextClassLoaderServiceDiscoverer discover;
+
+ /**
+ * @throws java.lang.Exception
+ */
+ @BeforeClass
+ public static void setUpBeforeClass() throws Exception {
+ discover = new ContextClassLoaderServiceDiscoverer();
+ }
+
+ @Test
+ public void testDiscovery() {
+ Set<ServiceDeclaration> discriptors =
+ discover.discover("org.apache.tuscany.sca.core.ModuleActivatorExtensionPoint", false);
+ Assert.assertEquals(1, discriptors.size());
+ discriptors =
+ discover.discover("notthere", false);
+ Assert.assertEquals(0, discriptors.size());
+ }
+
+ @Test
+ public void testDiscoveryFirst() {
+ Set<ServiceDeclaration> discriptors =
+ discover.discover("org.apache.tuscany.sca.core.ModuleActivatorExtensionPoint", true);
+ Assert.assertEquals(1, discriptors.size());
+ discriptors =
+ discover.discover("notthere", true);
+ Assert.assertEquals(0, discriptors.size());
+ }
+
+
+ /**
+ * @throws java.lang.Exception
+ */
+ @AfterClass
+ public static void tearDownAfterClass() throws Exception {
+ }
+
+}