Add an OSGi-based node implementation for dynamicity

git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@754969 13f79535-47bb-0310-9956-ffa450edef68

7 files changed, 855 insertions, 0 deletions

diff --git a/java/sca/modules/node-impl-osgi/src/main/java/org/apache/tuscany/sca/node/osgi/impl/NodeImpl.java b/java/sca/modules/node-impl-osgi/src/main/java/org/apache/tuscany/sca/node/osgi/impl/NodeImpl.java
new file mode 100644
index 0000000000..8ecb8b968d
--- /dev/null
+++ b/java/sca/modules/node-impl-osgi/src/main/java/org/apache/tuscany/sca/node/osgi/impl/NodeImpl.java
@@ -0,0 +1,668 @@
+/*
+* 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.node.osgi.impl;
+
+import static java.lang.System.currentTimeMillis;
+import static org.apache.tuscany.sca.node.osgi.impl.NodeUtil.contribution;
+import static org.apache.tuscany.sca.node.osgi.impl.NodeUtil.createURI;
+
+import java.io.ByteArrayInputStream;
+import java.io.File;
+import java.net.URI;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import javax.xml.namespace.QName;
+import javax.xml.stream.XMLInputFactory;
+import javax.xml.stream.XMLStreamReader;
+
+import org.apache.tuscany.sca.assembly.AssemblyFactory;
+import org.apache.tuscany.sca.assembly.Component;
+import org.apache.tuscany.sca.assembly.ComponentService;
+import org.apache.tuscany.sca.assembly.Composite;
+import org.apache.tuscany.sca.assembly.CompositeService;
+import org.apache.tuscany.sca.assembly.builder.CompositeBuilder;
+import org.apache.tuscany.sca.assembly.builder.CompositeBuilderExtensionPoint;
+import org.apache.tuscany.sca.contribution.Artifact;
+import org.apache.tuscany.sca.contribution.Contribution;
+import org.apache.tuscany.sca.contribution.ContributionFactory;
+import org.apache.tuscany.sca.contribution.DefaultImport;
+import org.apache.tuscany.sca.contribution.processor.StAXArtifactProcessor;
+import org.apache.tuscany.sca.contribution.processor.StAXArtifactProcessorExtensionPoint;
+import org.apache.tuscany.sca.contribution.processor.URLArtifactProcessor;
+import org.apache.tuscany.sca.contribution.processor.URLArtifactProcessorExtensionPoint;
+import org.apache.tuscany.sca.contribution.resolver.ExtensibleModelResolver;
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+import org.apache.tuscany.sca.contribution.resolver.ModelResolverExtensionPoint;
+import org.apache.tuscany.sca.core.DefaultExtensionPointRegistry;
+import org.apache.tuscany.sca.core.ExtensionPointRegistry;
+import org.apache.tuscany.sca.core.FactoryExtensionPoint;
+import org.apache.tuscany.sca.core.ModuleActivator;
+import org.apache.tuscany.sca.core.ModuleActivatorExtensionPoint;
+import org.apache.tuscany.sca.core.UtilityExtensionPoint;
+import org.apache.tuscany.sca.core.assembly.ActivationException;
+import org.apache.tuscany.sca.core.assembly.CompositeActivator;
+import org.apache.tuscany.sca.core.assembly.RuntimeAssemblyFactory;
+import org.apache.tuscany.sca.core.invocation.ExtensibleProxyFactory;
+import org.apache.tuscany.sca.core.invocation.ProxyFactory;
+import org.apache.tuscany.sca.core.invocation.ProxyFactoryExtensionPoint;
+import org.apache.tuscany.sca.definitions.Definitions;
+import org.apache.tuscany.sca.definitions.DefinitionsFactory;
+import org.apache.tuscany.sca.definitions.util.DefinitionsUtil;
+import org.apache.tuscany.sca.implementation.node.ConfiguredNodeImplementation;
+import org.apache.tuscany.sca.implementation.node.NodeImplementationFactory;
+import org.apache.tuscany.sca.monitor.Monitor;
+import org.apache.tuscany.sca.monitor.MonitorFactory;
+import org.apache.tuscany.sca.monitor.Problem;
+import org.apache.tuscany.sca.monitor.Problem.Severity;
+import org.apache.tuscany.sca.node.Client;
+import org.apache.tuscany.sca.node.Node;
+import org.apache.tuscany.sca.provider.DefinitionsProvider;
+import org.apache.tuscany.sca.provider.DefinitionsProviderException;
+import org.apache.tuscany.sca.provider.DefinitionsProviderExtensionPoint;
+import org.apache.tuscany.sca.runtime.RuntimeComponent;
+import org.apache.tuscany.sca.runtime.RuntimeComponentContext;
+import org.apache.tuscany.sca.work.WorkScheduler;
+import org.apache.tuscany.sca.workspace.Workspace;
+import org.apache.tuscany.sca.workspace.WorkspaceFactory;
+import org.apache.tuscany.sca.workspace.builder.ContributionBuilder;
+import org.apache.tuscany.sca.workspace.builder.ContributionBuilderExtensionPoint;
+import org.oasisopen.sca.CallableReference;
+import org.oasisopen.sca.ServiceReference;
+import org.oasisopen.sca.ServiceRuntimeException;
+import org.osgi.framework.Bundle;
+
+/**
+ * Represents an SCA runtime node.
+ * 
+ * @version $Rev$ $Date$
+ */
+public class NodeImpl implements Node, Client {
+
+    private static final String SCA11_TUSCANY_NS = "http://tuscany.apache.org/xmlns/sca/1.1";
+
+    private static final Logger logger = Logger.getLogger(NodeImpl.class.getName());
+
+    // The node configuration name, used for logging
+    private String configurationName;
+
+    // The composite loaded into this node
+    private Composite composite;
+
+    private ExtensionPointRegistry extensionPoints;
+    private Monitor monitor;
+    private URLArtifactProcessor<Contribution> contributionProcessor;
+    private ModelResolverExtensionPoint modelResolvers;
+    private FactoryExtensionPoint modelFactories;
+    private WorkspaceFactory workspaceFactory;
+    private ContributionFactory contributionFactory;
+    private AssemblyFactory assemblyFactory;
+    private XMLInputFactory inputFactory;
+    private ContributionBuilder contributionDependencyBuilder;
+    private CompositeBuilder compositeBuilder;
+    private StAXArtifactProcessorExtensionPoint xmlProcessors;
+    private StAXArtifactProcessor<Composite> compositeProcessor;
+    private ProxyFactory proxyFactory;
+    private List<ModuleActivator> moduleActivators = new ArrayList<ModuleActivator>();
+    private CompositeActivator compositeActivator;
+    private WorkScheduler workScheduler;
+    private Contribution systemContribution;
+    private Definitions systemDefinitions;
+
+    /** 
+     * Constructs a new SCA node.
+     */
+    public NodeImpl(Bundle bundle) {
+        configurationName = "[" + bundle.getBundleId() + "] " + bundle.getSymbolicName();
+        logger.log(Level.INFO, "Creating node: " + configurationName);
+
+        try {
+            // Initialize the runtime
+            init();
+
+            // Create a node configuration
+            NodeImplementationFactory nodeImplementationFactory =
+                modelFactories.getFactory(NodeImplementationFactory.class);
+            ConfiguredNodeImplementation configuration = nodeImplementationFactory.createConfiguredNodeImplementation();
+
+            String compositeURI = "OSGI-INF/sca/bundle.composite";
+            if (compositeURI != null) {
+                Composite composite = assemblyFactory.createComposite();
+                composite.setURI(compositeURI);
+                composite.setUnresolved(true);
+                configuration.setComposite(composite);
+            }
+
+            URL root = bundle.getEntry("/");
+            org.apache.tuscany.sca.node.Contribution bundleContribution =
+                new org.apache.tuscany.sca.node.Contribution(bundle.getSymbolicName(), root.toString());
+
+            Contribution contribution = contribution(contributionFactory, bundleContribution);
+            configuration.getContributions().add(contribution);
+
+            // Configure the node
+            configureNode(configuration);
+
+        } catch (Exception e) {
+            throw new ServiceRuntimeException(e);
+        }
+    }
+
+    /** 
+     * Constructs a new SCA node.
+     *  
+     * @param compositeURI
+     * @param compositeContent
+     * @param contributions
+     */
+    public NodeImpl(Bundle bundle, String compositeContent) {
+        configurationName = "[" + bundle.getBundleId() + "] " + bundle.getSymbolicName();
+        logger.log(Level.INFO, "Creating node: " + configurationName);
+
+        try {
+            // Initialize the runtime
+            init();
+
+            // Create a node configuration
+            NodeImplementationFactory nodeImplementationFactory =
+                modelFactories.getFactory(NodeImplementationFactory.class);
+            ConfiguredNodeImplementation configuration = nodeImplementationFactory.createConfiguredNodeImplementation();
+
+            URL root = bundle.getEntry("/");
+            org.apache.tuscany.sca.node.Contribution bundleContribution =
+                new org.apache.tuscany.sca.node.Contribution(bundle.getSymbolicName(), root.toString());
+
+            Contribution contribution = contribution(contributionFactory, bundleContribution);
+            configuration.getContributions().add(contribution);
+
+            Contribution defaultContribution = contributionFactory.createContribution();
+            defaultContribution.setURI(SCA11_TUSCANY_NS + "/DefaultContribution");
+
+            XMLStreamReader reader =
+                inputFactory.createXMLStreamReader(new ByteArrayInputStream(compositeContent.getBytes("UTF-8")));
+            reader.nextTag();
+
+            // Read the composite model
+            composite = (Composite)compositeProcessor.read(reader);
+
+            Artifact compositeArtifact = contributionFactory.createArtifact();
+            compositeArtifact.setModel(composite);
+            compositeArtifact.setURI("default.composite");
+
+            defaultContribution.getArtifacts().add(compositeArtifact);
+            defaultContribution.getDeployables().add(composite);
+            defaultContribution.getDependencies().add(contribution);
+
+            analyzeProblems();
+
+            configuration.setComposite(composite);
+            configuration.getContributions().add(contribution);
+            configuration.getContributions().add(defaultContribution);
+
+            // Configure the node
+            configureNode(configuration);
+
+        } catch (Exception e) {
+            throw new ServiceRuntimeException(e);
+        }
+    }
+
+    private void init() {
+        long start = currentTimeMillis();
+
+        // Create extension point registry 
+        extensionPoints = new DefaultExtensionPointRegistry();
+
+        // Use the runtime-enabled assembly factory 
+        modelFactories = extensionPoints.getExtensionPoint(FactoryExtensionPoint.class);
+        assemblyFactory = new RuntimeAssemblyFactory();
+        modelFactories.addFactory(assemblyFactory);
+
+        // Create a monitor
+        UtilityExtensionPoint utilities = extensionPoints.getExtensionPoint(UtilityExtensionPoint.class);
+        MonitorFactory monitorFactory = utilities.getUtility(MonitorFactory.class);
+        monitor = monitorFactory.createMonitor();
+
+        // Initialize the Tuscany module activators
+        ModuleActivatorExtensionPoint activators =
+            extensionPoints.getExtensionPoint(ModuleActivatorExtensionPoint.class);
+        for (ModuleActivator moduleActivator : activators.getModuleActivators()) {
+            try {
+                moduleActivator.start(extensionPoints);
+                moduleActivators.add(moduleActivator);
+            } catch (Throwable e) {
+                // Ignore the failing module for now
+                logger.log(Level.SEVERE, e.getMessage(), e);
+            }
+        }
+
+        // Get XML input/output factories
+        inputFactory = modelFactories.getFactory(XMLInputFactory.class);
+
+        // Get contribution workspace and assembly model factories
+        contributionFactory = modelFactories.getFactory(ContributionFactory.class);
+        workspaceFactory = modelFactories.getFactory(WorkspaceFactory.class);
+
+        // Create XML artifact processors
+        xmlProcessors = extensionPoints.getExtensionPoint(StAXArtifactProcessorExtensionPoint.class);
+        compositeProcessor = xmlProcessors.getProcessor(Composite.class);
+
+        // Create contribution content processor
+        URLArtifactProcessorExtensionPoint docProcessorExtensions =
+            extensionPoints.getExtensionPoint(URLArtifactProcessorExtensionPoint.class);
+        contributionProcessor = docProcessorExtensions.getProcessor(Contribution.class);
+
+        // Get the model resolvers
+        modelResolvers = extensionPoints.getExtensionPoint(ModelResolverExtensionPoint.class);
+
+        // Get a contribution dependency builder
+        ContributionBuilderExtensionPoint contributionBuilders =
+            extensionPoints.getExtensionPoint(ContributionBuilderExtensionPoint.class);
+        contributionDependencyBuilder =
+            contributionBuilders
+                .getContributionBuilder("org.apache.tuscany.sca.workspace.builder.ContributionDependencyBuilder");
+
+        // Get composite builders
+        CompositeBuilderExtensionPoint compositeBuilders =
+            extensionPoints.getExtensionPoint(CompositeBuilderExtensionPoint.class);
+        compositeBuilder =
+            compositeBuilders.getCompositeBuilder("org.apache.tuscany.sca.assembly.builder.CompositeBuilder");
+
+        // Initialize runtime
+
+        // Get proxy factory
+        ProxyFactoryExtensionPoint proxyFactories = extensionPoints.getExtensionPoint(ProxyFactoryExtensionPoint.class);
+        proxyFactory = new ExtensibleProxyFactory(proxyFactories);
+
+        // Get the composite activator
+        compositeActivator = utilities.getUtility(CompositeActivator.class);
+
+        workScheduler = utilities.getUtility(WorkScheduler.class);
+
+        // Load the system definitions.xml from all of the loaded extension points
+        DefinitionsProviderExtensionPoint definitionsProviders =
+            extensionPoints.getExtensionPoint(DefinitionsProviderExtensionPoint.class);
+        DefinitionsFactory definitionsFactory = modelFactories.getFactory(DefinitionsFactory.class);
+        systemDefinitions = definitionsFactory.createDefinitions();
+
+        // aggregate all the definitions into a single definitions model
+        try {
+            for (DefinitionsProvider definitionsProvider : definitionsProviders.getDefinitionsProviders()) {
+                DefinitionsUtil.aggregate(definitionsProvider.getDefinitions(), systemDefinitions);
+            }
+        } catch (DefinitionsProviderException e) {
+            throw new IllegalStateException(e);
+        }
+
+        // create a system contribution to hold the definitions. The contribution
+        // will be extended later with definitions from application contributions
+        systemContribution = contributionFactory.createContribution();
+        systemContribution.setURI("http://tuscany.apache.org/SystemContribution");
+        systemContribution.setLocation("http://tuscany.apache.org/SystemContribution");
+        ModelResolver modelResolver = new ExtensibleModelResolver(systemContribution, modelResolvers, modelFactories);
+        systemContribution.setModelResolver(modelResolver);
+        systemContribution.setUnresolved(true);
+
+        // create an artifact to represent the system defintions and
+        // add it to the contribution
+        List<Artifact> artifacts = systemContribution.getArtifacts();
+        Artifact artifact = contributionFactory.createArtifact();
+        artifact.setURI("http://tuscany.apache.org/SystemContribution/Definitions");
+        artifact.setLocation("Derived");
+        artifact.setModel(systemDefinitions);
+        artifacts.add(artifact);
+
+        // don't resolve the system contribution until all the application 
+        // level definitions have been added 
+
+        //
+        //        // Configure a resolver for the system definitions
+        //        ModelResolver definitionsResolver = new DefaultModelResolver();
+        //        for (Intent intent : systemDefinitions.getPolicyIntents()) {
+        //            definitionsResolver.addModel(intent);
+        //        }
+        //        for (PolicySet policySet : systemDefinitions.getPolicySets()) {
+        //            definitionsResolver.addModel(policySet);
+        //        }
+        //        for (ExtensionType bindingType : systemDefinitions.getBindingTypes()) {
+        //            definitionsResolver.addModel(bindingType);
+        //        }
+        //        for (ExtensionType implementationType : systemDefinitions.getImplementationTypes()) {
+        //            definitionsResolver.addModel(implementationType);
+        //        }
+        //
+        //        // Now that all system sca definitions have been read, let's resolve them
+        //        URLArtifactProcessorExtensionPoint documentProcessors = extensionPoints.getExtensionPoint(URLArtifactProcessorExtensionPoint.class);
+        //        URLArtifactProcessor<Definitions> definitionsProcessor = documentProcessors.getProcessor(Definitions.class);
+        //        try {
+        //            definitionsProcessor.resolve(systemDefinitions, definitionsResolver);
+        //        } catch (ContributionResolveException e) {
+        //            throw new IllegalStateException(e);
+        //        }
+
+        if (logger.isLoggable(Level.FINE)) {
+            long end = currentTimeMillis();
+            logger.fine("The tuscany runtime started in " + (end - start) + " ms.");
+        }
+    }
+
+    private void configureNode(ConfiguredNodeImplementation configuration) throws Exception {
+
+        // Create workspace model
+        Workspace workspace = workspaceFactory.createWorkspace();
+        workspace.setModelResolver(new ExtensibleModelResolver(workspace, modelResolvers, modelFactories));
+
+        // Load the specified contributions
+        for (Contribution c : configuration.getContributions()) {
+            URI contributionURI = URI.create(c.getURI());
+
+            URI uri = createURI(c.getLocation());
+            if (uri.getScheme() == null) {
+                uri = new File(c.getLocation()).toURI();
+            }
+            URL contributionURL = uri.toURL();
+
+            // Load the contribution
+            logger.log(Level.INFO, "Loading contribution: " + contributionURL);
+            Contribution contribution = contributionProcessor.read(null, contributionURI, contributionURL);
+            workspace.getContributions().add(contribution);
+            analyzeProblems();
+        }
+
+        // Build an aggregated SCA definitions model. Must be done before we try and
+        // resolve any contributions or composites as they may depend on the full
+        // definitions.xml picture
+
+        // get all definitions.xml artifacts from contributions and aggregate 
+        // into the system contribution. In turn add a default import into
+        // each contribution so that for unresolved items the resolution 
+        // processing will look in the system contribution 
+        for (Contribution contribution : workspace.getContributions()) {
+            // aggregate definitions
+            for (Artifact artifact : contribution.getArtifacts()) {
+                Object model = artifact.getModel();
+                if (model instanceof Definitions) {
+                    DefinitionsUtil.aggregate((Definitions)model, systemDefinitions);
+                }
+            }
+
+            // create a default import and wire it up to the system contribution
+            // model resolver. This is the trick that makes the resolution processing
+            // skip over to the system contribution if resolution is unsuccessful 
+            // in the current contribution
+            DefaultImport defaultImport = contributionFactory.createDefaultImport();
+            defaultImport.setModelResolver(systemContribution.getModelResolver());
+            contribution.getImports().add(defaultImport);
+        }
+
+        // now resolve the system contribution and add the contribution 
+        // to the workspace
+        contributionProcessor.resolve(systemContribution, workspace.getModelResolver());
+        workspace.getContributions().add(systemContribution);
+
+        // TODO - Now we can calculate applicable policy sets for each composite 
+
+        // Build the contribution dependencies
+        Set<Contribution> resolved = new HashSet<Contribution>();
+        for (Contribution contribution : workspace.getContributions()) {
+            contributionDependencyBuilder.build(contribution, workspace, monitor);
+
+            // Resolve contributions
+            for (Contribution dependency : contribution.getDependencies()) {
+                if (!resolved.contains(dependency)) {
+                    resolved.add(dependency);
+                    contributionProcessor.resolve(dependency, workspace.getModelResolver());
+                }
+            }
+        }
+
+        composite = configuration.getComposite();
+
+        if (composite == null) {
+            setDefaultComposite(configuration, workspace);
+        }
+
+        // Find the composite in the given contributions
+        boolean found = false;
+        Artifact compositeFile = contributionFactory.createArtifact();
+        compositeFile.setUnresolved(true);
+        compositeFile.setURI(composite.getURI());
+        for (Contribution contribution : workspace.getContributions()) {
+            ModelResolver resolver = contribution.getModelResolver();
+            //            for (Artifact artifact : contribution.getArtifacts()){
+            //                logger.log(Level.INFO,"artifact - " + artifact.getURI());
+            //            }
+            Artifact resolvedArtifact = resolver.resolveModel(Artifact.class, compositeFile);
+            //            if (!resolvedArtifact.isUnresolved() && resolvedArtifact.getModel() instanceof Composite) {
+
+            if (!composite.isUnresolved()) {
+
+                // The composite content was passed into the node and read into a composite model,
+                // don't use the composite found in the contribution, use that composite, but just resolve
+                // it within the context of the contribution
+                compositeProcessor.resolve(composite, resolver);
+
+            } else {
+
+                // Use the resolved composite we've found in the contribution
+                composite = (Composite)resolvedArtifact.getModel();
+            }
+            found = true;
+            //            break;
+            //          }
+        }
+        //        if (!found) {
+        //            throw new IllegalArgumentException("Composite not found: " + composite.getURI());
+        //        }
+
+        // Build the composite and wire the components included in it
+        compositeBuilder.build(composite, systemDefinitions, monitor);
+        analyzeProblems();
+
+        // Create a top level composite to host our composite
+        // This is temporary to make the activator happy
+        Composite tempComposite = assemblyFactory.createComposite();
+        tempComposite.setName(new QName(SCA11_TUSCANY_NS, "_tempComposite"));
+        tempComposite.setURI(SCA11_TUSCANY_NS);
+
+        // Include the node composite in the top-level composite 
+        tempComposite.getIncludes().add(composite);
+
+        // Set the top level composite on the composite activator as 
+        // logic in callable reference resolution relies on this being 
+        // available
+        compositeActivator.setDomainComposite(tempComposite);
+
+        /*
+        // The following line may return null, to be investigated
+        XPathFactory xPathFactory = modelFactories.getFactory(XPathFactory.class);
+        
+        for (PolicySet policySet : systemDefinitions.getPolicySets()) {
+            if (policySet.getAppliesTo() != null) {
+                XPath xpath = xPathFactory.newXPath();
+                // FIXME: We need to develop a xpath function resolver to
+                // deal with the SCA functions
+                // xpath.setXPathFunctionResolver(resolver);
+                XPathExpression exp = xpath.compile(policySet.getAppliesTo());
+                // exp.evaluate(item, XPathConstants.BOOLEAN);
+            }
+        }
+        */
+    }
+
+    public void start() {
+        logger.log(Level.INFO, "Starting node: " + configurationName);
+
+        try {
+
+            // Activate the composite
+            compositeActivator.activate(composite);
+
+            // Start the composite
+            compositeActivator.start(composite);
+
+        } catch (ActivationException e) {
+            throw new IllegalStateException(e);
+        }
+
+    }
+
+    public void stop() {
+        logger.log(Level.INFO, "Stopping node: " + configurationName);
+
+        try {
+
+            // Stop the composite
+            compositeActivator.stop(composite);
+
+            // Deactivate the composite
+            compositeActivator.deactivate(composite);
+
+        } catch (ActivationException e) {
+            throw new IllegalStateException(e);
+        }
+
+    }
+
+    public void destroy() {
+        // Stop the runtime modules
+        for (ModuleActivator moduleActivator : moduleActivators) {
+            moduleActivator.stop(extensionPoints);
+        }
+
+        // Stop and destroy the work manager
+        workScheduler.destroy();
+    }
+
+    public <B, R extends CallableReference<B>> R cast(B target) throws IllegalArgumentException {
+        return (R)proxyFactory.cast(target);
+    }
+
+    public <B> B getService(Class<B> businessInterface, String serviceName) {
+
+        ServiceReference<B> serviceReference = getServiceReference(businessInterface, serviceName);
+        if (serviceReference == null) {
+            throw new ServiceRuntimeException("Service not found: " + serviceName);
+        }
+        return serviceReference.getService();
+    }
+
+    public <B> ServiceReference<B> getServiceReference(Class<B> businessInterface, String name) {
+
+        // Extract the component name
+        String componentName;
+        String serviceName;
+        int i = name.indexOf('/');
+        if (i != -1) {
+            componentName = name.substring(0, i);
+            serviceName = name.substring(i + 1);
+
+        } else {
+            componentName = name;
+            serviceName = null;
+        }
+
+        // Lookup the component 
+        Component component = null;
+
+        for (Component compositeComponent : composite.getComponents()) {
+            if (compositeComponent.getName().equals(componentName)) {
+                component = compositeComponent;
+            }
+        }
+
+        if (component == null) {
+            throw new ServiceRuntimeException("The service " + name + " has not been contributed to the domain");
+        }
+        RuntimeComponentContext componentContext = null;
+
+        // If the component is a composite, then we need to find the
+        // non-composite component that provides the requested service
+        if (component.getImplementation() instanceof Composite) {
+            for (ComponentService componentService : component.getServices()) {
+                if (serviceName == null || serviceName.equals(componentService.getName())) {
+                    CompositeService compositeService = (CompositeService)componentService.getService();
+                    if (compositeService != null) {
+                        if (serviceName != null) {
+                            serviceName = "$promoted$" + component.getName() + "$slash$" + serviceName;
+                        }
+                        componentContext =
+                            ((RuntimeComponent)compositeService.getPromotedComponent()).getComponentContext();
+                        return componentContext.createSelfReference(businessInterface, compositeService
+                            .getPromotedService());
+                    }
+                    break;
+                }
+            }
+            // No matching service found
+            throw new ServiceRuntimeException("Composite service not found: " + name);
+        } else {
+            componentContext = ((RuntimeComponent)component).getComponentContext();
+            if (serviceName != null) {
+                return componentContext.createSelfReference(businessInterface, serviceName);
+            } else {
+                return componentContext.createSelfReference(businessInterface);
+            }
+        }
+    }
+
+    /**
+     * Analyze problems reported by the artifact processors and builders.
+     * 
+     * @throws Exception
+     */
+    private void analyzeProblems() throws Exception {
+        for (Problem problem : monitor.getProblems()) {
+            if ((problem.getSeverity() == Severity.ERROR) && (!problem.getMessageId().equals("SchemaError"))) {
+                if (problem.getCause() != null) {
+                    throw problem.getCause();
+                } else {
+                    throw new ServiceRuntimeException(problem.toString());
+                }
+            }
+        }
+    }
+
+    /*
+     * Sets a default composite by using any deployable one.
+     */
+    private void setDefaultComposite(ConfiguredNodeImplementation configuration, Workspace workspace) {
+        // just use the first deployable composte
+        for (Contribution contribution : workspace.getContributions()) {
+            for (Composite c : contribution.getDeployables()) {
+                composite = assemblyFactory.createComposite();
+                composite.setURI(c.getURI());
+                composite.setUnresolved(true);
+                configuration.setComposite(composite);
+                return;
+            }
+        }
+        throw new ServiceRuntimeException("no deployable composite found");
+    }
+
+    public ExtensionPointRegistry getExtensionPoints() {
+        return extensionPoints;
+    }
+}
diff --git a/java/sca/modules/node-impl-osgi/src/main/java/org/apache/tuscany/sca/node/osgi/impl/NodeUtil.java b/java/sca/modules/node-impl-osgi/src/main/java/org/apache/tuscany/sca/node/osgi/impl/NodeUtil.java
new file mode 100644
index 0000000000..dc7e3645a1
--- /dev/null
+++ b/java/sca/modules/node-impl-osgi/src/main/java/org/apache/tuscany/sca/node/osgi/impl/NodeUtil.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.node.osgi.impl;
+
+import java.net.URI;
+import java.util.logging.Logger;
+
+import org.apache.tuscany.sca.contribution.Contribution;
+import org.apache.tuscany.sca.contribution.ContributionFactory;
+
+/**
+ * NodeUtil
+ *
+ * @version $Rev: $ $Date: $
+ */
+public class NodeUtil {
+    private static final Logger logger = Logger.getLogger(NodeImpl.class.getName());
+
+    static Contribution contribution(ContributionFactory contributionFactory, org.apache.tuscany.sca.node.Contribution c) {
+        Contribution contribution = contributionFactory.createContribution();
+        contribution.setURI(c.getURI());
+        contribution.setLocation(c.getLocation());
+        contribution.setUnresolved(true);
+        return contribution;
+    }
+
+    /**
+     * Escape the space in URL string
+     * @param uri
+     * @return
+     */
+    static URI createURI(String uri) {
+        if (uri.indexOf(' ') != -1) {
+            uri = uri.replace(" ", "%20");
+        }
+        return URI.create(uri);
+    }
+
+}
diff --git a/java/sca/modules/node-impl-osgi/src/main/resources/META-INF/services/org.apache.tuscany.sca.node.NodeFactory b/java/sca/modules/node-impl-osgi/src/main/resources/META-INF/services/org.apache.tuscany.sca.node.NodeFactory
new file mode 100644
index 0000000000..2d7902084d
--- /dev/null
+++ b/java/sca/modules/node-impl-osgi/src/main/resources/META-INF/services/org.apache.tuscany.sca.node.NodeFactory
@@ -0,0 +1,17 @@
+# 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.node.osgi.impl.NodeFactoryImpl
\ No newline at end of file
diff --git a/java/sca/modules/node-impl-osgi/src/test/java/hello/HelloWorld.java b/java/sca/modules/node-impl-osgi/src/test/java/hello/HelloWorld.java
new file mode 100644
index 0000000000..e3fcdfd25f
--- /dev/null
+++ b/java/sca/modules/node-impl-osgi/src/test/java/hello/HelloWorld.java
@@ -0,0 +1,30 @@
+/*
+ * 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 hello;
+
+import org.oasisopen.sca.annotation.Remotable;
+
+/**
+ * HelloWorld interface
+ */
+@Remotable
+public interface HelloWorld {
+    String hello(String name);
+}
diff --git a/java/sca/modules/node-impl-osgi/src/test/java/hello/HelloWorldImpl.java b/java/sca/modules/node-impl-osgi/src/test/java/hello/HelloWorldImpl.java
new file mode 100644
index 0000000000..c9a7560b12
--- /dev/null
+++ b/java/sca/modules/node-impl-osgi/src/test/java/hello/HelloWorldImpl.java
@@ -0,0 +1,30 @@
+/*
+ * 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 hello;
+
+/**
+ * HelloWorldImpl
+ */
+public class HelloWorldImpl implements HelloWorld {
+    public String hello(String name) {
+        System.out.println("Hello: " + name);
+        return "Hello, " + name;
+    }
+}
diff --git a/java/sca/modules/node-impl-osgi/src/test/resources/HelloWorld.composite b/java/sca/modules/node-impl-osgi/src/test/resources/HelloWorld.composite
new file mode 100644
index 0000000000..27ddcb94a8
--- /dev/null
+++ b/java/sca/modules/node-impl-osgi/src/test/resources/HelloWorld.composite
@@ -0,0 +1,30 @@
+<?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/200903"

+    xmlns:tuscany="http://docs.oasis-open.org/ns/opencsa/sca/200903"

+	targetNamespace="http://sample/composite"

+	xmlns:sc="http://sample/composite"

+	name="HelloWorld">

+

+    <component name="HelloWorld">

+        <implementation.java class="hello.HelloWorldImpl"/>

+    </component>

+

+</composite>

diff --git a/java/sca/modules/node-impl-osgi/src/test/resources/META-INF/sca-contribution.xml b/java/sca/modules/node-impl-osgi/src/test/resources/META-INF/sca-contribution.xml
new file mode 100644
index 0000000000..1149eb5cbf
--- /dev/null
+++ b/java/sca/modules/node-impl-osgi/src/test/resources/META-INF/sca-contribution.xml
@@ -0,0 +1,24 @@
+<?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.    
+-->
+
+<contribution xmlns="http://docs.oasis-open.org/ns/opencsa/sca/200903" 
+              xmlns:sc="http://sample/composite">
+    <deployable composite="sc:HelloWorld" />
+</contribution>