Copying modules from Equinox branch, to start merging the delta changes from 1.x/original trunk

git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@718815 13f79535-47bb-0310-9956-ffa450edef68

10 files changed, 1142 insertions, 0 deletions

diff --git a/java/sca/modules/contribution-osgi/src/main/java/org/apache/tuscany/sca/contribution/osgi/BundleReference.java b/java/sca/modules/contribution-osgi/src/main/java/org/apache/tuscany/sca/contribution/osgi/BundleReference.java
new file mode 100644
index 0000000000..0bbb8b707a
--- /dev/null
+++ b/java/sca/modules/contribution-osgi/src/main/java/org/apache/tuscany/sca/contribution/osgi/BundleReference.java
@@ -0,0 +1,161 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.contribution.osgi;
+
+
+/**
+ * A weak reference to a class, which should be used to register classes
+ * with an ArtifactResolver and resolve these classes later.
+ *
+ * @version $Rev$ $Date$
+ */
+public class BundleReference {
+
+    /**
+     * The bundle.
+     */
+    private Object bundle;
+
+    /**
+     * The bundle name.
+     */
+    private String bundleName;
+
+    /**
+     * The bundle version.
+     */
+    private String bundleVersion;
+
+    /**
+     * The bundle name and version.
+     */
+    private String bundleUniqueName;
+
+    /**
+     * The bundle relative path.
+     */
+    private String bundleRelativePath;
+
+    /**
+     * Constructs a new BundleReference.
+     * 
+     * @param bundle The bundle reference
+     * @param bundleName The bundle name
+     * @param bundleVersion The bundle version
+     * @param bundleRelativePath The relative path for the bundle
+     */
+    public BundleReference(Object bundle, String bundleName, String bundleVersion, String bundleRelativePath) {
+        this.bundle = bundle;
+        this.bundleName = bundleName;
+        this.bundleVersion = bundleVersion;       
+        this.bundleRelativePath = bundleRelativePath;
+        this.bundleUniqueName = bundleName + "(" + (bundleVersion == null?"0.0.0":bundleVersion) + ")";
+    }
+    
+    /**
+     * Constructs a new BundleReference.
+     * 
+     * @param bundleName The bundle name
+     * @param bundleVersion The bundle version
+     */
+    public BundleReference(String bundleName, String bundleVersion) {
+        this.bundleName = bundleName;
+        this.bundleVersion = bundleVersion;
+        this.bundleUniqueName = bundleName + "(" + (bundleVersion == null?"0.0.0":bundleVersion) + ")";
+    }
+    
+    /**
+     * Get the referenced bundle.
+     * 
+     * @return The referenced bundle
+     */
+    public Object getBundle() {
+        return bundle;
+    }
+    
+    /**
+     * Get the referenced bundle name.
+     * 
+     * @return The bundle name
+     */
+    public String getBundleName() {
+        return bundleName;
+    }
+    
+    /**
+     * Get the referenced bundle version.
+     * 
+     * @return The bundle version
+     */
+    public String getBundleVersion() {
+        return bundleVersion;
+    }
+    
+    /**
+     * Get the referenced bundle name and version.
+     * 
+     * @return The bundle name
+     */
+    public String getBundleUniqueName() {
+        return bundleUniqueName;
+    }
+    
+    /**
+     * Get the relative location of the bundle inside its contribution.
+     * 
+     * @return The bundle path
+     */
+    public String getBundleRelativePath() {
+        return bundleRelativePath;
+    }
+    
+    
+    
+    /**
+     * Returns true if the bundle reference is unresolved.
+     * 
+     * @return Whether or not the bundle has been resolved
+     */
+    public boolean isUnresolved() {
+        return bundle == null;
+    }
+
+    @Override
+    public int hashCode() {
+        return bundleUniqueName.hashCode();
+    }
+    
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == this) {
+            return true;
+        } else {
+            if (obj instanceof BundleReference) {
+                BundleReference ref = (BundleReference)obj;
+                return bundleName.equals(ref.bundleName) &&
+                       (bundleVersion == null || ref.bundleVersion == null ||
+                        bundleVersion.equals(ref.bundleVersion));
+            } else {
+                return false;
+            }
+        }
+    }
+
+}
diff --git a/java/sca/modules/contribution-osgi/src/main/java/org/apache/tuscany/sca/contribution/osgi/impl/OSGiBundleContributionProcessor.java b/java/sca/modules/contribution-osgi/src/main/java/org/apache/tuscany/sca/contribution/osgi/impl/OSGiBundleContributionProcessor.java
new file mode 100644
index 0000000000..5033d7eefc
--- /dev/null
+++ b/java/sca/modules/contribution-osgi/src/main/java/org/apache/tuscany/sca/contribution/osgi/impl/OSGiBundleContributionProcessor.java
@@ -0,0 +1,161 @@
+/*

+ * Licensed to the Apache Software Foundation (ASF) under one

+ * or more contributor license agreements.  See the NOTICE file

+ * distributed with this work for additional information

+ * regarding copyright ownership.  The ASF licenses this file

+ * to you under the Apache License, Version 2.0 (the

+ * "License"); you may not use this file except in compliance

+ * with the License.  You may obtain a copy of the License at

+ * 

+ *   http://www.apache.org/licenses/LICENSE-2.0

+ * 

+ * Unless required by applicable law or agreed to in writing,

+ * software distributed under the License is distributed on an

+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

+ * KIND, either express or implied.  See the License for the

+ * specific language governing permissions and limitations

+ * under the License.    

+ */

+

+package org.apache.tuscany.sca.contribution.osgi.impl;

+

+import java.io.IOException;

+import java.io.InputStream;

+import java.net.MalformedURLException;

+import java.net.URI;

+import java.net.URL;

+import java.util.ArrayList;

+import java.util.Enumeration;

+import java.util.HashSet;

+import java.util.List;

+import java.util.Set;

+import java.util.jar.JarEntry;

+import java.util.jar.JarInputStream;

+

+import org.apache.tuscany.sca.contribution.PackageType;

+import org.apache.tuscany.sca.contribution.processor.PackageProcessor;

+import org.apache.tuscany.sca.contribution.service.ContributionException;

+import org.apache.tuscany.sca.osgi.runtime.OSGiRuntime;

+import org.osgi.framework.Bundle;

+

+/**

+ * Bundle Contribution package processor.

+ *

+ * @version $Rev$ $Date$

+ */

+public class OSGiBundleContributionProcessor implements PackageProcessor {

+

+    public OSGiBundleContributionProcessor() {

+    }

+

+    public String getPackageType() {

+        return PackageType.BUNDLE;

+    }

+

+    public URL getArtifactURL(URL sourceURL, URI artifact) throws MalformedURLException {

+        Bundle bundle = null;

+        try {

+            bundle = OSGiRuntime.findInstalledBundle(sourceURL);

+            if (bundle != null) {

+                URL url = bundle.getResource(artifact.getPath());

+                if (url == null)

+                    System.out.println("Could not load resource " + artifact);

+                return url;

+            }

+        } catch (Exception e) {

+        }

+        return null;

+    }

+    

+    public List<URI> getJarArtifacts(URL packageSourceURL, InputStream inputStream) throws ContributionException,

+    IOException {

+    if (packageSourceURL == null) {

+        throw new IllegalArgumentException("Invalid null package source URL.");

+    }

+

+    if (inputStream == null) {

+        throw new IllegalArgumentException("Invalid null source inputstream.");

+    }

+

+    // Assume the root is a jar file

+    JarInputStream jar = new JarInputStream(inputStream);

+    try {

+        Set<String> names = new HashSet<String>();

+        while (true) {

+            JarEntry entry = jar.getNextJarEntry();

+            if (entry == null) {

+                // EOF

+                break;

+            }

+

+            // FIXME: Maybe we should externalize the filter as a property

+            String name = entry.getName(); 

+            if (!name.startsWith(".") && !entry.isDirectory()) {

+                

+                // Trim trailing /

+                if (name.endsWith("/")) {

+                    name = name.substring(0, name.length() - 1);

+                }

+

+                // Add the entry name

+                if (!names.contains(name) && name.length() > 0) {

+                    names.add(name);

+                    

+                }

+            }

+        }

+        

+        // Return list of URIs

+        List<URI> artifacts = new ArrayList<URI>();

+        for (String name: names) {

+            artifacts.add(URI.create(name));

+        }

+        return artifacts;

+        

+    } finally {

+        jar.close();

+    }

+}

+

+    public List<URI> getArtifacts(URL packageSourceURL, InputStream inputStream) throws ContributionException,

+        IOException {

+        

+        Bundle bundle = null;

+        try {

+            bundle = OSGiRuntime.findInstalledBundle(packageSourceURL);

+        } catch (Exception e) {

+        }

+        

+        if (bundle == null) {

+            throw new IllegalArgumentException("Could not find OSGi bundle " + packageSourceURL);

+        }

+        

+        if (packageSourceURL == null) {

+            throw new IllegalArgumentException("Invalid null package source URL.");

+        }

+

+        List<URI> artifacts = new ArrayList<URI>();

+

+        try {

+            Enumeration entries = bundle.findEntries("/", "*", true);

+            while (entries.hasMoreElements()) {

+                URL entry = (URL)entries.nextElement();

+                String entryName = entry.getPath();

+                if (entryName.startsWith("/"))

+                    entryName = entryName.substring(1);

+                artifacts.add(new URI(entryName));

+                

+                if (entryName.endsWith(".jar")) {

+

+                    URL jarResource = bundle.getResource(entryName);

+                    artifacts.addAll(getJarArtifacts(jarResource, jarResource.openStream()));

+                }

+            

+            }

+        } catch (Exception e) {

+            throw new RuntimeException(e);

+        }

+

+        return artifacts;

+    }

+}

diff --git a/java/sca/modules/contribution-osgi/src/main/java/org/apache/tuscany/sca/contribution/osgi/impl/OSGiBundleProcessor.java b/java/sca/modules/contribution-osgi/src/main/java/org/apache/tuscany/sca/contribution/osgi/impl/OSGiBundleProcessor.java
new file mode 100644
index 0000000000..b3c2302f60
--- /dev/null
+++ b/java/sca/modules/contribution-osgi/src/main/java/org/apache/tuscany/sca/contribution/osgi/impl/OSGiBundleProcessor.java
@@ -0,0 +1,141 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.contribution.osgi.impl;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URL;
+import java.util.List;
+import java.util.jar.Attributes;
+import java.util.jar.JarInputStream;
+import java.util.jar.Manifest;
+
+import org.apache.tuscany.sca.contribution.Artifact;
+import org.apache.tuscany.sca.contribution.Contribution;
+import org.apache.tuscany.sca.contribution.osgi.BundleReference;
+import org.apache.tuscany.sca.osgi.runtime.OSGiRuntime;
+
+/**
+ * OSGi bundle processor
+ *
+ * @version $Rev$ $Date$
+ */
+public class OSGiBundleProcessor {
+
+    private boolean initializedOSGi;
+    private OSGiRuntime osgiRuntime;
+
+    public OSGiBundleProcessor() {
+    }
+
+    public Object installContributionBundle(Contribution contribution) {
+
+        JarInputStream jar = null;
+        Object bundle = null;
+
+        try {
+
+            URL contribURL = new URL(contribution.getLocation());
+            jar = new JarInputStream(contribURL.openStream());
+
+            Manifest manifest = jar.getManifest();
+            if (manifest != null && manifest.getMainAttributes()
+                .containsKey(new Attributes.Name("Bundle-SymbolicName"))) {
+
+                initialize();
+                if (osgiRuntime != null)
+                    bundle = osgiRuntime.installBundle(contribURL.toString(), null);
+            }
+        } catch (Exception e) {
+            // If OSGi cannot process the jar, treat the bundle as a plain jar file.
+        } finally {
+
+            try {
+                if (jar != null)
+                    jar.close();
+            } catch (IOException e) {
+            }
+        }
+
+        return bundle;
+    }
+
+    public BundleReference installNestedBundle(Contribution contribution,
+                                               String bundleSymbolicName,
+                                               String bundleVersion) {
+
+        BundleReference bundleReference = null;
+
+        initialize();
+        if (osgiRuntime == null)
+            return null;
+
+        List<Artifact> artifacts = contribution.getArtifacts();
+        for (Artifact a : artifacts) {
+            if (a.getURI().endsWith(".jar")) {
+
+                InputStream stream;
+                JarInputStream jar = null;
+                Object name;
+                Object version;
+                try {
+
+                    URL artifactURL = new URL(a.getLocation());
+                    stream = artifactURL.openStream();
+                    jar = new JarInputStream(artifactURL.openStream());
+                    Manifest manifest = jar.getManifest();
+                    name = manifest.getMainAttributes().get(new Attributes.Name("Bundle-SymbolicName"));
+                    version = manifest.getMainAttributes().get(new Attributes.Name("Bundle-Version"));
+
+                    if (bundleSymbolicName.equals(name) && (bundleVersion == null || version == null || bundleVersion
+                        .equals(version))) {
+
+                        Object bundle = osgiRuntime.installBundle(a.getLocation(), stream);
+
+                        bundleReference = new BundleReference(bundle, bundleSymbolicName, bundleVersion, a.getURI());
+
+                        break;
+                    }
+
+                } catch (Exception e) {
+
+                    // If OSGi cannot process the jar, treat the bundle as a plain jar file.
+                } finally {
+                    try {
+                        if (jar != null)
+                            jar.close();
+                    } catch (IOException e) {
+                    }
+                }
+            }
+        }
+        return bundleReference;
+    }
+
+    private void initialize() {
+        try {
+            if (!initializedOSGi) {
+                initializedOSGi = true;
+                osgiRuntime = OSGiRuntime.getRuntime();
+            }
+        } catch (Exception e) {
+        }
+    }
+}
diff --git a/java/sca/modules/contribution-osgi/src/main/java/org/apache/tuscany/sca/contribution/osgi/impl/OSGiBundleReferenceModelResolver.java b/java/sca/modules/contribution-osgi/src/main/java/org/apache/tuscany/sca/contribution/osgi/impl/OSGiBundleReferenceModelResolver.java
new file mode 100644
index 0000000000..07e80f66f3
--- /dev/null
+++ b/java/sca/modules/contribution-osgi/src/main/java/org/apache/tuscany/sca/contribution/osgi/impl/OSGiBundleReferenceModelResolver.java
@@ -0,0 +1,154 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.contribution.osgi.impl;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.apache.tuscany.sca.contribution.Contribution;
+import org.apache.tuscany.sca.contribution.Import;
+import org.apache.tuscany.sca.contribution.ModelFactoryExtensionPoint;
+import org.apache.tuscany.sca.contribution.osgi.BundleReference;
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+import org.apache.tuscany.sca.osgi.runtime.OSGiRuntime;
+import org.osgi.framework.Bundle;
+
+/**
+ * A Model Resolver for BundleReferences.
+ *
+ * @version $Rev$ $Date$
+ */
+public class OSGiBundleReferenceModelResolver implements ModelResolver {
+    private Contribution contribution;
+    private Map<String, BundleReference> map = new HashMap<String, BundleReference>();
+    
+    OSGiRuntime osgiRuntime;
+    private OSGiBundleProcessor bundleProcessor;
+    
+    public OSGiBundleReferenceModelResolver(Contribution contribution, ModelFactoryExtensionPoint modelFactories) {
+        this.contribution = contribution;
+        this.bundleProcessor = new OSGiBundleProcessor();
+    }
+
+    public void addModel(Object resolved) {
+        BundleReference bundleRef = (BundleReference)resolved;
+        map.put(bundleRef.getBundleUniqueName(), bundleRef);
+    }
+    
+    public Object removeModel(Object resolved) {
+        return map.remove(((BundleReference)resolved).getBundleUniqueName());
+    }
+    
+    /**
+     * Handle artifact resolution when the specific class reference is imported from another contribution
+     * @param unresolved
+     * @return
+     */
+    private BundleReference resolveImportedModel(BundleReference unresolved) {
+        BundleReference resolved = unresolved;
+
+        if( this.contribution != null) {
+            for (Import import_ : this.contribution.getImports()) {
+                
+                resolved = import_.getModelResolver().resolveModel(BundleReference.class, unresolved);
+                if (resolved != unresolved)
+                        break;
+            }
+            
+        }
+        return resolved;
+    }
+    
+    
+    public <T> T resolveModel(Class<T> modelClass, T unresolved) {
+        Object resolved = map.get(unresolved);
+        
+        if (resolved != null ){
+            return modelClass.cast(resolved);
+        } 
+        
+        try {
+            if (osgiRuntime == null)
+                osgiRuntime = OSGiRuntime.getRuntime();
+        } catch (Exception e) {
+        }
+        if (osgiRuntime == null)
+            return unresolved;
+
+        //Load a class on demand
+        Object bundle = null;
+        String bundleName = ((BundleReference)unresolved).getBundleName();
+        String bundleVersion = ((BundleReference)unresolved).getBundleVersion();
+        
+        bundle = osgiRuntime.findBundle(bundleName, bundleVersion);
+        BundleReference bundleReference;
+        
+        if (bundle == null)
+            bundleReference = bundleProcessor.installNestedBundle(contribution, bundleName, bundleVersion);
+        else {
+            bundleReference = new BundleReference(bundle, 
+                    ((BundleReference)unresolved).getBundleName(),
+                    bundleVersion,
+                    getBundleFileName(bundle)
+                    );
+        }
+                
+        
+        if (bundleReference != null) {
+            //if we load the class            
+            
+            map.put(((BundleReference)unresolved).getBundleUniqueName(), bundleReference);
+            
+            // Return the resolved BundleReference
+            return modelClass.cast(bundleReference);            
+        } else {
+            //delegate resolution of the class
+            resolved = this.resolveImportedModel((BundleReference)unresolved);
+            return modelClass.cast(resolved);
+        }
+        
+
+    }
+    
+    
+    private String getBundleFileName(Object bundle) {
+        if (bundle instanceof Bundle) {
+            String path = ((Bundle)bundle).getLocation();
+            if (path.endsWith("/"))
+                path = path.substring(0, path.length()-1);
+            if (path.startsWith(contribution.getLocation())) {
+                if (path.equals(contribution.getLocation())) {
+                    int index = path.lastIndexOf('/');
+                    if (index > 0 && index < path.length()-1)
+                        path = path.substring(index+1);
+                } else {
+                    path = path.substring(contribution.getLocation().length());
+                    if (path.startsWith("/"))
+                        path = path.substring(1);
+                }
+            } else if (path.lastIndexOf('/') >= 0)
+                path = path.substring(path.lastIndexOf('/')+1);
+            return path;
+        }
+        return null;
+            
+    }
+    
+}
diff --git a/java/sca/modules/contribution-osgi/src/main/java/org/apache/tuscany/sca/contribution/osgi/impl/OSGiClassReferenceModelResolver.java b/java/sca/modules/contribution-osgi/src/main/java/org/apache/tuscany/sca/contribution/osgi/impl/OSGiClassReferenceModelResolver.java
new file mode 100644
index 0000000000..528a287328
--- /dev/null
+++ b/java/sca/modules/contribution-osgi/src/main/java/org/apache/tuscany/sca/contribution/osgi/impl/OSGiClassReferenceModelResolver.java
@@ -0,0 +1,137 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.contribution.osgi.impl;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.apache.tuscany.sca.contribution.Contribution;
+import org.apache.tuscany.sca.contribution.Import;
+import org.apache.tuscany.sca.contribution.ModelFactoryExtensionPoint;
+import org.apache.tuscany.sca.contribution.resolver.ClassReference;
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+import org.apache.tuscany.sca.osgi.runtime.OSGiRuntime;
+import org.osgi.framework.Bundle;
+
+/**
+ * A Model Resolver for ClassReferences.
+ *
+ * @version $Rev$ $Date$
+ */
+public class OSGiClassReferenceModelResolver implements ModelResolver {
+    private Contribution contribution;
+    private Map<String, ClassReference> map = new HashMap<String, ClassReference>();
+    private Bundle bundle;
+    private boolean initialized;
+    private boolean useOSGi;
+
+    public OSGiClassReferenceModelResolver(Contribution contribution, ModelFactoryExtensionPoint modelFactories) {
+        this.contribution = contribution;
+    }
+
+    public void addModel(Object resolved) {
+        ClassReference clazz = (ClassReference)resolved;
+        map.put(clazz.getClassName(), clazz);
+    }
+
+    public Object removeModel(Object resolved) {
+        return map.remove(((ClassReference)resolved).getClassName());
+    }
+
+    /**
+     * Handle artifact resolution when the specific class reference is imported from another contribution
+     * @param unresolved
+     * @return
+     */
+    private ClassReference resolveImportedModel(ClassReference unresolved) {
+        ClassReference resolved = unresolved;
+
+        if (this.contribution != null) {
+            for (Import import_ : this.contribution.getImports()) {
+
+                if (resolved == unresolved && bundle != null) {
+                    resolved = import_.getModelResolver().resolveModel(ClassReference.class, unresolved);
+                    if (resolved != unresolved)
+                        break;
+                }
+            }
+
+        }
+        return resolved;
+    }
+
+    public <T> T resolveModel(Class<T> modelClass, T unresolved) {
+        Object resolved = map.get(unresolved);
+
+        if (resolved != null) {
+            return modelClass.cast(resolved);
+        }
+        initialize();
+        if (!useOSGi)
+            return unresolved;
+
+        //Load a class on demand
+        Class clazz = null;
+        if (bundle != null) {
+            try {
+                clazz = bundle.loadClass(((ClassReference)unresolved).getClassName());
+            } catch (Exception e) {
+                // we will later try to delegate to imported model resolvers
+            }
+        }
+
+        if (clazz != null) {
+            //if we load the class            
+            // Store a new ClassReference wrapping the loaded class
+            ClassReference classReference = new ClassReference(clazz);
+            map.put(getPackageName(classReference), classReference);
+
+            // Return the resolved ClassReference
+            return modelClass.cast(classReference);
+        } else {
+            //delegate resolution of the class
+            resolved = this.resolveImportedModel((ClassReference)unresolved);
+            return modelClass.cast(resolved);
+        }
+
+    }
+
+    /***************
+     * Helper methods
+     ***************/
+
+    private String getPackageName(ClassReference clazz) {
+        int pos = clazz.getClassName().lastIndexOf(".");
+        return clazz.getClassName().substring(0, pos - 1);
+    }
+
+    private void initialize() {
+        if (initialized)
+            return;
+
+        initialized = true;
+        try {
+            bundle = OSGiRuntime.findInstalledBundle(contribution.getLocation());
+            useOSGi = bundle != null;
+        } catch (Throwable e) {
+            // Ignore errors, default to ClassReferenceModelResolver
+        }
+    }
+}
diff --git a/java/sca/modules/contribution-osgi/src/main/java/org/apache/tuscany/sca/contribution/osgi/impl/OSGiImportExportListener.java b/java/sca/modules/contribution-osgi/src/main/java/org/apache/tuscany/sca/contribution/osgi/impl/OSGiImportExportListener.java
new file mode 100644
index 0000000000..15ad0bd948
--- /dev/null
+++ b/java/sca/modules/contribution-osgi/src/main/java/org/apache/tuscany/sca/contribution/osgi/impl/OSGiImportExportListener.java
@@ -0,0 +1,215 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.contribution.osgi.impl;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.InputStream;
+import java.net.URL;
+import java.util.HashSet;
+import java.util.jar.JarOutputStream;
+import java.util.jar.Manifest;
+import java.util.zip.ZipEntry;
+
+import org.apache.tuscany.sca.contribution.Contribution;
+import org.apache.tuscany.sca.contribution.Export;
+import org.apache.tuscany.sca.contribution.Import;
+import org.apache.tuscany.sca.contribution.java.JavaExport;
+import org.apache.tuscany.sca.contribution.java.JavaImport;
+import org.apache.tuscany.sca.contribution.service.ContributionListener;
+import org.apache.tuscany.sca.contribution.service.ContributionRepository;
+import org.apache.tuscany.sca.osgi.runtime.OSGiRuntime;
+
+/**
+ * Namespace Import/Export contribution listener
+ * The listener would process all import/export from a given contribution 
+ * and initialize the model resolvers properly
+ * 
+ * @version $Rev$ $Date$
+ */
+public class OSGiImportExportListener implements ContributionListener {
+
+    private OSGiBundleProcessor bundleProcessor;
+
+    public OSGiImportExportListener() {
+        bundleProcessor = new OSGiBundleProcessor();
+    }
+
+    /**
+     * Initialize the import/export model resolvers
+     * Export model resolvers are same as Contribution model resolver
+     * Import model resolvers are matched to a specific contribution if a location URI is specified, 
+     *    otherwise it try to resolve against all the other contributions
+     */
+    public void contributionAdded(ContributionRepository repository, Contribution contribution) {
+
+        OSGiRuntime osgiRuntime = null;
+        try {
+            if (bundleProcessor.installContributionBundle(contribution) == null) {
+                return;
+            } else {
+                osgiRuntime = OSGiRuntime.getRuntime();
+            }
+        } catch (Exception e) {
+            return;
+        }
+
+        HashSet<Contribution> bundlesToInstall = new HashSet<Contribution>();
+        // Initialize the contribution imports
+        for (Import import_ : contribution.getImports()) {
+            boolean initialized = false;
+
+            if (import_ instanceof JavaImport) {
+                JavaImport javaImport = (JavaImport)import_;
+                String packageName = javaImport.getPackage();
+
+                //Find a matching contribution
+                if (javaImport.getLocation() != null) {
+                    Contribution targetContribution = repository.getContribution(javaImport.getLocation());
+                    if (targetContribution != null) {
+
+                        // Find a matching contribution export
+                        for (Export export : targetContribution.getExports()) {
+                            if (export instanceof JavaExport) {
+                                JavaExport javaExport = (JavaExport)export;
+                                if (packageName.equals(javaExport.getPackage())) {
+
+                                    if (osgiRuntime.findBundle(targetContribution.getLocation()) == null)
+                                        bundlesToInstall.add(targetContribution);
+
+                                    initialized = true;
+
+                                }
+                            }
+                            if (initialized)
+                                break;
+                        }
+                    }
+                }
+            }
+            if (!initialized) {
+                for (Contribution c : repository.getContributions()) {
+
+                    // Go over all exports in the contribution
+                    for (Export export : c.getExports()) {
+                        // If the export matches our namespace, try to the resolve the model object
+                        if (import_.match(export) && osgiRuntime.findBundle(c.getLocation()) == null) {
+                            bundlesToInstall.add(c);
+                        }
+                    }
+                }
+            }
+        }
+        for (Contribution c : bundlesToInstall) {
+            try {
+                installDummyBundle(osgiRuntime, c);
+            } catch (Exception e) {
+            }
+        }
+
+    }
+
+    public void contributionRemoved(ContributionRepository repository, Contribution contribution) {
+
+    }
+
+    public void contributionUpdated(ContributionRepository repository,
+                                    Contribution oldContribution,
+                                    Contribution contribution) {
+
+    }
+
+    private void installDummyBundle(OSGiRuntime osgiRuntime, Contribution contribution) throws Exception {
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+
+        String EOL = System.getProperty("line.separator");
+
+        String bundleName = contribution.getURI();
+        URL contribURL = new URL(contribution.getLocation());
+        String contribName = contribURL.getPath();
+        if (contribName.endsWith("/")) 
+            contribName = contribName.substring(0, contribName.length()-1);
+        if (contribName.lastIndexOf("/") >= 0)
+            contribName = contribName.substring(contribName.lastIndexOf("/")+1);            
+
+        StringBuffer exportPackageNames = new StringBuffer();
+        for (Export export : contribution.getExports()) {
+            if (export instanceof JavaExport) {
+                if (exportPackageNames.length() > 0)
+                    exportPackageNames.append(",");
+                exportPackageNames.append(((JavaExport)export).getPackage());
+            }
+        }
+        StringBuffer importPackageNames = new StringBuffer();
+        for (Import import_ : contribution.getImports()) {
+            if (import_ instanceof JavaImport) {
+                if (importPackageNames.length() > 0)
+                    importPackageNames.append(",");
+                importPackageNames.append(((JavaImport)import_).getPackage());
+            }
+        }
+
+        String manifestStr =
+            "Manifest-Version: 1.0" + EOL
+                + "Bundle-ManifestVersion: 2"
+                + EOL
+                + "Bundle-Name: "
+                + bundleName
+                + EOL
+                + "Bundle-SymbolicName: "
+                + bundleName
+                + EOL
+                + "Bundle-Version: "
+                + "1.0.0"
+                + EOL
+                + "Bundle-Localization: plugin"
+                + EOL;
+
+        StringBuilder manifestBuf = new StringBuilder();
+        manifestBuf.append(manifestStr);
+        manifestBuf.append("Export-Package: " + exportPackageNames + EOL);
+        manifestBuf.append("Import-Package: " + importPackageNames + EOL);
+        manifestBuf.append("Bundle-ClassPath: .," + contribName + EOL);
+
+        ByteArrayInputStream manifestStream = new ByteArrayInputStream(manifestBuf.toString().getBytes());
+        Manifest manifest = new Manifest();
+        manifest.read(manifestStream);
+
+        JarOutputStream jarOut = new JarOutputStream(out, manifest);
+
+        ZipEntry ze = new ZipEntry(contribName);
+        jarOut.putNextEntry(ze);
+        InputStream stream = contribURL.openStream();
+
+        byte[] bytes = new byte[stream.available()];
+        stream.read(bytes);
+        jarOut.write(bytes);
+        stream.close();
+
+        jarOut.close();
+        out.close();
+
+        ByteArrayInputStream in = new ByteArrayInputStream(out.toByteArray());
+
+        osgiRuntime.installBundle("file://" + bundleName + ".jar", in);
+
+    }
+
+}
diff --git a/java/sca/modules/contribution-osgi/src/main/java/org/apache/tuscany/sca/contribution/osgi/impl/OSGiModelResolverImpl.java b/java/sca/modules/contribution-osgi/src/main/java/org/apache/tuscany/sca/contribution/osgi/impl/OSGiModelResolverImpl.java
new file mode 100644
index 0000000000..e624b1d3b5
--- /dev/null
+++ b/java/sca/modules/contribution-osgi/src/main/java/org/apache/tuscany/sca/contribution/osgi/impl/OSGiModelResolverImpl.java
@@ -0,0 +1,119 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.contribution.osgi.impl;
+
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.Hashtable;
+import java.util.Map;
+
+import org.apache.tuscany.sca.contribution.osgi.BundleReference;
+import org.apache.tuscany.sca.contribution.resolver.ClassReference;
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+import org.osgi.framework.Bundle;
+
+/**
+ * An implementation of an artifact resolver for OSGi bundles.
+ *
+ * @version $Rev$ $Date$
+ */
+public class OSGiModelResolverImpl implements ModelResolver {
+    private static final long serialVersionUID = -7826976465762296634L;
+    
+    private Map<Object, Object> map = new HashMap<Object, Object>();
+    
+    private Hashtable<String, Bundle>  bundles;
+    public OSGiModelResolverImpl(Hashtable<String, Bundle> bundles) {
+        this.bundles = bundles;
+    }
+    
+    
+    public <T> T resolveModel(Class<T> modelClass, T unresolved) {
+        Object resolved = map.get(unresolved);
+        if (resolved != null) {
+            
+            // Return the resolved object
+            return modelClass.cast(resolved);
+            
+        } else if (unresolved instanceof ClassReference) {
+            
+            // Load a class on demand
+            ClassReference classReference = (ClassReference)unresolved;
+            Class clazz = null;
+            for (Bundle bundle : bundles.values()) {
+                try {
+                    clazz = bundle.loadClass(classReference.getClassName());
+                } catch (ClassNotFoundException e) {
+                    continue;
+                }
+                break;
+            }
+            if (clazz == null) {
+
+                // Return the unresolved object
+                return unresolved;
+            }
+            
+            // Store a new ClassReference wrapping the loaded class
+            resolved = new ClassReference(clazz);
+            map.put(resolved, resolved);
+            
+            // Return the resolved ClassReference
+            return modelClass.cast(resolved);
+                
+        } else if (unresolved instanceof BundleReference) {
+            for (String bundlePath: bundles.keySet()) {
+                Bundle bundle = bundles.get(bundlePath);
+                BundleReference bundleRef = (BundleReference)unresolved;
+                String bundleVersion = (String)bundle.getHeaders().get("Bundle-Version");
+                if (bundle.getSymbolicName().equals(bundleRef.getBundleName())&&
+                    (bundleVersion == null || bundleRef.getBundleVersion() == null ||
+                    bundleVersion.equals(bundleRef.getBundleVersion()))) {
+                    
+                    resolved = new BundleReference(bundle, 
+                            bundle.getSymbolicName(), 
+                            bundleVersion,
+                            bundlePath);
+                    map.put(resolved, resolved);
+                    
+                    // Return the resolved BundleReference
+                    return modelClass.cast(resolved);
+                    
+                }
+            }
+        } 
+            
+        // Return the unresolved object
+        return unresolved;
+    }
+    
+    public void addModel(Object resolved) {
+        map.put(resolved, resolved);
+    }
+    
+    public Object removeModel(Object resolved) {
+        return map.remove(resolved);
+    }
+    
+    public Collection<Object> getModels() {
+        return map.values();
+    }
+    
+}
diff --git a/java/sca/modules/contribution-osgi/src/main/resources/META-INF/services/org.apache.tuscany.sca.contribution.processor.PackageProcessor b/java/sca/modules/contribution-osgi/src/main/resources/META-INF/services/org.apache.tuscany.sca.contribution.processor.PackageProcessor
new file mode 100644
index 0000000000..632d135cb5
--- /dev/null
+++ b/java/sca/modules/contribution-osgi/src/main/resources/META-INF/services/org.apache.tuscany.sca.contribution.processor.PackageProcessor
@@ -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.contribution.osgi.impl.OSGiBundleContributionProcessor;type=application/osgi.bundle

diff --git a/java/sca/modules/contribution-osgi/src/main/resources/META-INF/services/org.apache.tuscany.sca.contribution.resolver.ModelResolver b/java/sca/modules/contribution-osgi/src/main/resources/META-INF/services/org.apache.tuscany.sca.contribution.resolver.ModelResolver
new file mode 100644
index 0000000000..02e8b411eb
--- /dev/null
+++ b/java/sca/modules/contribution-osgi/src/main/resources/META-INF/services/org.apache.tuscany.sca.contribution.resolver.ModelResolver
@@ -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.contribution.osgi.impl.OSGiBundleReferenceModelResolver;model=org.apache.tuscany.sca.contribution.osgi.BundleReference

diff --git a/java/sca/modules/contribution-osgi/src/main/resources/META-INF/services/org.apache.tuscany.sca.contribution.service.ContributionListener b/java/sca/modules/contribution-osgi/src/main/resources/META-INF/services/org.apache.tuscany.sca.contribution.service.ContributionListener
new file mode 100644
index 0000000000..8dec190930
--- /dev/null
+++ b/java/sca/modules/contribution-osgi/src/main/resources/META-INF/services/org.apache.tuscany.sca.contribution.service.ContributionListener
@@ -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.contribution.osgi.impl.OSGiImportExportListener