Add a model for Python component implementations.

git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@988363 13f79535-47bb-0310-9956-ffa450edef68

12 files changed, 733 insertions, 0 deletions

diff --git a/sca-java-2.x/trunk/modules/implementation-python/LICENSE b/sca-java-2.x/trunk/modules/implementation-python/LICENSE
new file mode 100644
index 0000000000..6e529a25c4
--- /dev/null
+++ b/sca-java-2.x/trunk/modules/implementation-python/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

+      control with that entity. For the purposes of this definition,

+      "control" means (i) the power, direct or indirect, to cause the

+      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.

+

+      "Source" form shall mean the preferred form for making modifications,

+      including but not limited to software source code, documentation

+      source, and configuration files.

+

+      "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

+      the brackets!)  The text should be enclosed in the appropriate

+      comment syntax for the file format. We also recommend that a

+      file or class name and description of purpose be included on the

+      same "printed page" as the copyright notice for easier

+      identification within third-party archives.

+

+   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/sca-java-2.x/trunk/modules/implementation-python/META-INF/MANIFEST.MF b/sca-java-2.x/trunk/modules/implementation-python/META-INF/MANIFEST.MF
new file mode 100644
index 0000000000..590513a698
--- /dev/null
+++ b/sca-java-2.x/trunk/modules/implementation-python/META-INF/MANIFEST.MF
@@ -0,0 +1,11 @@
+Manifest-Version: 1.0

+SCA-Version: 1.1

+Bundle-Name: Apache Tuscany Python Implementation Model

+Bundle-Vendor: The Apache Software Foundation

+Bundle-Version: 2.0.0

+Bundle-ManifestVersion: 2

+Bundle-License: http://www.apache.org/licenses/LICENSE-2.0.txt

+Bundle-Description: Apache Tuscany SCA Python Implementation Model

+Bundle-SymbolicName: org.apache.tuscany.sca.implementation.python

+Bundle-DocURL: http://www.apache.org/

+Bundle-RequiredExecutionEnvironment: J2SE-1.5,JavaSE-1.6
diff --git a/sca-java-2.x/trunk/modules/implementation-python/NOTICE b/sca-java-2.x/trunk/modules/implementation-python/NOTICE
new file mode 100644
index 0000000000..9ddba06a32
--- /dev/null
+++ b/sca-java-2.x/trunk/modules/implementation-python/NOTICE
@@ -0,0 +1,6 @@
+${pom.name}

+Copyright (c) 2005 - 2010 The Apache Software Foundation

+

+This product includes software developed by

+The Apache Software Foundation (http://www.apache.org/).

+

diff --git a/sca-java-2.x/trunk/modules/implementation-python/pom.xml b/sca-java-2.x/trunk/modules/implementation-python/pom.xml
new file mode 100644
index 0000000000..d3a678b3b3
--- /dev/null
+++ b/sca-java-2.x/trunk/modules/implementation-python/pom.xml
@@ -0,0 +1,84 @@
+<?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>2.0-SNAPSHOT</version>
+        <relativePath>../pom.xml</relativePath>
+    </parent>
+
+    <artifactId>tuscany-implementation-python</artifactId>
+    <name>Apache Tuscany SCA Python Implementation Model</name>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.tuscany.sca</groupId>
+            <artifactId>tuscany-assembly</artifactId>
+            <version>2.0-SNAPSHOT</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.apache.tuscany.sca</groupId>
+            <artifactId>tuscany-assembly-xml</artifactId>
+            <version>2.0-SNAPSHOT</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.apache.tuscany.sca</groupId>
+            <artifactId>tuscany-core-spi</artifactId>
+            <version>2.0-SNAPSHOT</version>
+        </dependency>
+ 
+        <dependency>
+            <groupId>org.apache.tuscany.sca</groupId>
+            <artifactId>tuscany-contribution</artifactId>
+            <version>2.0-SNAPSHOT</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.apache.tuscany.sca</groupId>
+            <artifactId>tuscany-interface-java</artifactId>
+            <version>2.0-SNAPSHOT</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.apache.tuscany.sca</groupId>
+            <artifactId>tuscany-databinding-json</artifactId>
+            <version>2.0-SNAPSHOT</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.apache.tuscany.sca</groupId>
+            <artifactId>tuscany-monitor</artifactId>
+            <version>2.0-SNAPSHOT</version>
+        </dependency>
+        
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.8.1</version>
+            <scope>test</scope>
+        </dependency>
+
+    </dependencies>
+
+</project>
diff --git a/sca-java-2.x/trunk/modules/implementation-python/src/main/java/org/apache/tuscany/sca/implementation/python/PythonEval.java b/sca-java-2.x/trunk/modules/implementation-python/src/main/java/org/apache/tuscany/sca/implementation/python/PythonEval.java
new file mode 100644
index 0000000000..2ce220f84e
--- /dev/null
+++ b/sca-java-2.x/trunk/modules/implementation-python/src/main/java/org/apache/tuscany/sca/implementation/python/PythonEval.java
@@ -0,0 +1,33 @@
+/*
+ * 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.implementation.python;
+
+import org.oasisopen.sca.annotation.Remotable;
+
+
+/**
+ * Python component generic evaluation interface.
+ * 
+ * @version $Rev$ $Date$
+ */
+@Remotable
+public interface PythonEval {
+
+	public String eval(String args) throws Exception;
+}
diff --git a/sca-java-2.x/trunk/modules/implementation-python/src/main/java/org/apache/tuscany/sca/implementation/python/PythonImplementation.java b/sca-java-2.x/trunk/modules/implementation-python/src/main/java/org/apache/tuscany/sca/implementation/python/PythonImplementation.java
new file mode 100644
index 0000000000..dd5ad99893
--- /dev/null
+++ b/sca-java-2.x/trunk/modules/implementation-python/src/main/java/org/apache/tuscany/sca/implementation/python/PythonImplementation.java
@@ -0,0 +1,83 @@
+/*
+ * 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.implementation.python;
+
+import javax.xml.namespace.QName;
+
+import org.apache.tuscany.sca.assembly.Reference;
+import org.apache.tuscany.sca.assembly.Service;
+import org.apache.tuscany.sca.assembly.impl.ImplementationImpl;
+import org.apache.tuscany.sca.assembly.impl.ReferenceImpl;
+import org.apache.tuscany.sca.assembly.impl.ServiceImpl;
+import org.apache.tuscany.sca.interfacedef.InterfaceContract;
+
+/**
+ * The model representing a Python implementation in an SCA assembly.
+ * 
+ * @version $Rev$ $Date$
+ */
+public class PythonImplementation extends ImplementationImpl {
+    final String script;
+    final String location;
+    final InterfaceContract contract;
+    final Service service;
+
+    PythonImplementation(final QName qn, final String scr, final String loc, final InterfaceContract c) {
+        super(qn);
+        script = scr;
+        location = loc;
+        contract = c;
+
+        class DynService extends ServiceImpl {
+        	public DynService() {
+        		setName("default");
+        		setInterfaceContract(contract);
+			}
+        };
+        service = new DynService();
+        getServices().add(service);
+    }
+
+    public String getScript() {
+        return script;
+    }
+    
+    public String getLocation() {
+		return location;
+	}
+
+    public Service getService(final String n) {
+    	return service;
+    }  
+
+    public Reference getReference(final String n) {
+    	final Reference r = super.getReference(n);
+    	if (r != null)
+    		return r;
+    	class DynReference extends ReferenceImpl {
+    		public DynReference() {
+    	    	setName(n);
+    	    	setInterfaceContract(contract);
+			}
+    	}
+    	final Reference nr = new DynReference();
+    	getReferences().add(nr);
+    	return nr;
+    }    
+}
diff --git a/sca-java-2.x/trunk/modules/implementation-python/src/main/java/org/apache/tuscany/sca/implementation/python/PythonImplementationProcessor.java b/sca-java-2.x/trunk/modules/implementation-python/src/main/java/org/apache/tuscany/sca/implementation/python/PythonImplementationProcessor.java
new file mode 100644
index 0000000000..3edfb951ae
--- /dev/null
+++ b/sca-java-2.x/trunk/modules/implementation-python/src/main/java/org/apache/tuscany/sca/implementation/python/PythonImplementationProcessor.java
@@ -0,0 +1,109 @@
+/*
+ * 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.implementation.python;
+
+import static javax.xml.stream.XMLStreamConstants.END_ELEMENT;
+import static org.apache.tuscany.sca.assembly.Base.SCA11_TUSCANY_NS;
+
+import java.net.URI;
+
+import javax.xml.namespace.QName;
+import javax.xml.stream.XMLStreamException;
+import javax.xml.stream.XMLStreamReader;
+import javax.xml.stream.XMLStreamWriter;
+
+import org.apache.tuscany.sca.contribution.processor.BaseStAXArtifactProcessor;
+import org.apache.tuscany.sca.contribution.processor.ContributionReadException;
+import org.apache.tuscany.sca.contribution.processor.ContributionResolveException;
+import org.apache.tuscany.sca.contribution.processor.ContributionWriteException;
+import org.apache.tuscany.sca.contribution.processor.ProcessorContext;
+import org.apache.tuscany.sca.contribution.processor.StAXArtifactProcessor;
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+import org.apache.tuscany.sca.core.ExtensionPointRegistry;
+import org.apache.tuscany.sca.core.FactoryExtensionPoint;
+import org.apache.tuscany.sca.databinding.json.JSONDataBinding;
+import org.apache.tuscany.sca.interfacedef.InterfaceContract;
+import org.apache.tuscany.sca.interfacedef.InvalidInterfaceException;
+import org.apache.tuscany.sca.interfacedef.Operation;
+import org.apache.tuscany.sca.interfacedef.java.JavaInterface;
+import org.apache.tuscany.sca.interfacedef.java.JavaInterfaceFactory;
+import org.apache.tuscany.sca.interfacedef.java.impl.JavaInterfaceImpl;
+
+/**
+ * Implements a StAX artifact processor for Python implementations.
+ * 
+ * @version $Rev$ $Date$
+ */
+public class PythonImplementationProcessor extends BaseStAXArtifactProcessor implements StAXArtifactProcessor<PythonImplementation> {
+    static QName QN = new QName(SCA11_TUSCANY_NS, "implementation.python");
+
+    final InterfaceContract contract;
+
+    public PythonImplementationProcessor(final ExtensionPointRegistry ep) throws InvalidInterfaceException, NoSuchMethodException {
+        final FactoryExtensionPoint fep = ep.getExtensionPoint(FactoryExtensionPoint.class);
+        final JavaInterfaceFactory jf = fep.getFactory(JavaInterfaceFactory.class);
+        final JavaInterface eval = jf.createJavaInterface(PythonEval.class);
+        
+        class DynamicInterface extends JavaInterfaceImpl {
+        	DynamicInterface() throws NoSuchMethodException {
+        		setJavaClass(eval.getJavaClass());
+        		setName(eval.getName());
+        		setRemotable(eval.isRemotable());
+        		Operation op = eval.getOperations().get(0);
+        		op.setDynamic(true);
+        		getOperations().add(op);
+                resetDataBinding(JSONDataBinding.NAME);
+                setUnresolved(false);
+			}
+        	
+        	@Override
+        	public boolean isDynamic() {
+        		return true;
+        	}
+        }
+        
+        contract = jf.createJavaInterfaceContract();
+        contract.setInterface(new DynamicInterface());
+    }
+
+    public QName getArtifactType() {
+        return QN;
+    }
+
+    public Class<PythonImplementation> getModelType() {
+        return PythonImplementation.class;
+    }
+
+    public PythonImplementation read(final XMLStreamReader r, final ProcessorContext ctx) throws ContributionReadException, XMLStreamException {
+        final String scr = r.getAttributeValue(null, "script");
+        while (r.hasNext() && !(r.next() == END_ELEMENT && QN.equals(r.getName())));
+        return new PythonImplementation(QN, scr, URI.create(ctx.getContribution().getLocation()).getPath(), contract);
+    }
+
+    public void resolve(final PythonImplementation impl, final ModelResolver res, final ProcessorContext ctx) throws ContributionResolveException {
+    }
+
+    public void write(final PythonImplementation impl, final XMLStreamWriter w, final ProcessorContext ctx) throws ContributionWriteException, XMLStreamException {
+        writeStart(w,
+                   QN.getNamespaceURI(),
+                   QN.getLocalPart(),
+                   new XAttr("script", impl.getScript()));
+        writeEnd(w);
+    }
+}
diff --git a/sca-java-2.x/trunk/modules/implementation-python/src/main/resources/META-INF/services/org.apache.tuscany.sca.contribution.processor.StAXArtifactProcessor b/sca-java-2.x/trunk/modules/implementation-python/src/main/resources/META-INF/services/org.apache.tuscany.sca.contribution.processor.StAXArtifactProcessor
new file mode 100644
index 0000000000..c6f60b9880
--- /dev/null
+++ b/sca-java-2.x/trunk/modules/implementation-python/src/main/resources/META-INF/services/org.apache.tuscany.sca.contribution.processor.StAXArtifactProcessor
@@ -0,0 +1,20 @@
+# 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. 
+
+# Implementation class for the artifact processor extension
+org.apache.tuscany.sca.implementation.python.PythonImplementationProcessor;qname=http://tuscany.apache.org/xmlns/sca/1.1#implementation.python,model=org.apache.tuscany.sca.implementation.python.PythonImplementation
+
diff --git a/sca-java-2.x/trunk/modules/implementation-python/src/main/resources/META-INF/services/org.apache.tuscany.sca.contribution.processor.ValidationSchema b/sca-java-2.x/trunk/modules/implementation-python/src/main/resources/META-INF/services/org.apache.tuscany.sca.contribution.processor.ValidationSchema
new file mode 100644
index 0000000000..2543a67897
--- /dev/null
+++ b/sca-java-2.x/trunk/modules/implementation-python/src/main/resources/META-INF/services/org.apache.tuscany.sca.contribution.processor.ValidationSchema
@@ -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/implementation/python/tuscany-sca-1.1-implementation-python.xsd

diff --git a/sca-java-2.x/trunk/modules/implementation-python/src/main/resources/org/apache/tuscany/sca/implementation/python/tuscany-sca-1.1-implementation-python.xsd b/sca-java-2.x/trunk/modules/implementation-python/src/main/resources/org/apache/tuscany/sca/implementation/python/tuscany-sca-1.1-implementation-python.xsd
new file mode 100644
index 0000000000..75e69f1ccd
--- /dev/null
+++ b/sca-java-2.x/trunk/modules/implementation-python/src/main/resources/org/apache/tuscany/sca/implementation/python/tuscany-sca-1.1-implementation-python.xsd
@@ -0,0 +1,38 @@
+<?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.
+-->
+<schema xmlns="http://www.w3.org/2001/XMLSchema"
+    targetNamespace="http://tuscany.apache.org/xmlns/sca/1.1"
+    xmlns:sca="http://docs.oasis-open.org/ns/opencsa/sca/200912"
+    xmlns:t="http://tuscany.apache.org/xmlns/sca/1.1"
+    elementFormDefault="qualified">
+
+    <import namespace="http://docs.oasis-open.org/ns/opencsa/sca/200912"/>
+
+    <element name="implementation.python" type="t:PythonImplementation" substitutionGroup="sca:implementation"/>
+
+    <complexType name="PythonImplementation">
+        <complexContent>
+            <extension base="sca:Implementation">
+                <attribute name="script" type="string" use="required"/>
+            </extension>
+        </complexContent>
+    </complexType>
+
+</schema>
diff --git a/sca-java-2.x/trunk/modules/implementation-python/src/test/java/org/apache/tuscany/sca/implementation/python/ReadWriteTestCase.java b/sca-java-2.x/trunk/modules/implementation-python/src/test/java/org/apache/tuscany/sca/implementation/python/ReadWriteTestCase.java
new file mode 100644
index 0000000000..2f5f8b16dc
--- /dev/null
+++ b/sca-java-2.x/trunk/modules/implementation-python/src/test/java/org/apache/tuscany/sca/implementation/python/ReadWriteTestCase.java
@@ -0,0 +1,87 @@
+/*
+ * 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.implementation.python;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
+
+import java.io.ByteArrayOutputStream;
+import java.io.InputStream;
+
+import javax.xml.stream.XMLInputFactory;
+import javax.xml.stream.XMLOutputFactory;
+
+import org.apache.tuscany.sca.assembly.Composite;
+import org.apache.tuscany.sca.contribution.Contribution;
+import org.apache.tuscany.sca.contribution.DefaultContributionFactory;
+import org.apache.tuscany.sca.contribution.processor.DefaultStAXArtifactProcessorExtensionPoint;
+import org.apache.tuscany.sca.contribution.processor.ExtensibleStAXArtifactProcessor;
+import org.apache.tuscany.sca.contribution.processor.ProcessorContext;
+import org.apache.tuscany.sca.contribution.processor.StAXArtifactProcessor;
+import org.apache.tuscany.sca.contribution.processor.StAXArtifactProcessorExtensionPoint;
+import org.apache.tuscany.sca.core.DefaultExtensionPointRegistry;
+import org.apache.tuscany.sca.monitor.DefaultMonitorFactory;
+import org.apache.tuscany.sca.monitor.Monitor;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+
+/**
+ * Test reading/writing Python implementations.
+ * 
+ * @version $Rev$ $Date$
+ */
+public class ReadWriteTestCase {
+    static XMLInputFactory xif;
+    static XMLOutputFactory xof;
+    static StAXArtifactProcessor<Object> xproc;
+    static ProcessorContext ctx;
+
+    @BeforeClass
+    public static void setUp() throws Exception {
+        final DefaultExtensionPointRegistry ep = new DefaultExtensionPointRegistry();
+        final Contribution contrib = new DefaultContributionFactory().createContribution();
+        contrib.setLocation(ReadWriteTestCase.class.getProtectionDomain().getCodeSource().getLocation().toString());
+        final Monitor mon = new DefaultMonitorFactory().createMonitor();
+        ctx = new ProcessorContext(contrib, mon);
+        xif = XMLInputFactory.newInstance();
+        xof = XMLOutputFactory.newInstance();
+        final StAXArtifactProcessorExtensionPoint xpep = new DefaultStAXArtifactProcessorExtensionPoint(ep);
+        xproc = new ExtensibleStAXArtifactProcessor(xpep, xif, xof);
+    }
+
+    @Test
+    public void testRead() throws Exception {
+        final InputStream is = getClass().getClassLoader().getResourceAsStream("domain-test.composite");
+        final Composite c = (Composite) xproc.read(xif.createXMLStreamReader(is), ctx);
+        assertNotNull(c);
+        assertEquals("server_test.py", ((PythonImplementation)c.getComponents().get(0).getImplementation()).getScript());
+    }
+
+    @Test
+    public void testReadWrite() throws Exception {
+        final InputStream is = getClass().getClassLoader().getResourceAsStream("domain-test.composite");
+        final Composite c = (Composite) xproc.read(xif.createXMLStreamReader(is), ctx);
+        final ByteArrayOutputStream bos = new ByteArrayOutputStream();
+        xproc.write(c, xof.createXMLStreamWriter(bos), ctx);
+        assertTrue(bos.toString().contains("script=\"server_test.py\""));
+    }
+}
diff --git a/sca-java-2.x/trunk/modules/implementation-python/src/test/resources/domain-test.composite b/sca-java-2.x/trunk/modules/implementation-python/src/test/resources/domain-test.composite
new file mode 100644
index 0000000000..c1e40dc676
--- /dev/null
+++ b/sca-java-2.x/trunk/modules/implementation-python/src/test/resources/domain-test.composite
@@ -0,0 +1,39 @@
+<?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.    
+-->
+<composite xmlns="http://docs.oasis-open.org/ns/opencsa/sca/200912"
+  xmlns:t="http://tuscany.apache.org/xmlns/sca/1.1"
+  targetNamespace="http://domain/test"
+  name="domain-test">
+        
+    <component name="python-test">
+        <t:implementation.python script="server_test.py"/>
+        <service name="test">
+        </service>
+    </component>     
+
+    <component name="client-test">
+        <t:implementation.python script="client_test.py"/>
+        <service name="client">
+        </service>
+        <reference name="ref" target="python-test">
+        </reference>
+    </component>
+
+</composite>