Refactor the deployment-related code from NodeFactoryImpl into a Deployer utility

git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@828248 13f79535-47bb-0310-9956-ffa450edef68

7 files changed, 807 insertions, 375 deletions

diff --git a/java/sca/modules/node-impl-osgi/src/main/java/org/apache/tuscany/sca/node/osgi/impl/OSGiNodeFactoryImpl.java b/java/sca/modules/node-impl-osgi/src/main/java/org/apache/tuscany/sca/node/osgi/impl/OSGiNodeFactoryImpl.java
index 3a698eeb4b..42481c7e8e 100644
--- a/java/sca/modules/node-impl-osgi/src/main/java/org/apache/tuscany/sca/node/osgi/impl/OSGiNodeFactoryImpl.java
+++ b/java/sca/modules/node-impl-osgi/src/main/java/org/apache/tuscany/sca/node/osgi/impl/OSGiNodeFactoryImpl.java
@@ -26,6 +26,7 @@ import java.util.Hashtable;
 import java.util.logging.Level;
 
 import org.apache.tuscany.sca.core.ExtensionPointRegistry;
+import org.apache.tuscany.sca.core.FactoryExtensionPoint;
 import org.apache.tuscany.sca.extensibility.equinox.OSGiExtensionPointRegistry;
 import org.apache.tuscany.sca.node.configuration.NodeConfiguration;
 import org.apache.tuscany.sca.node.configuration.NodeConfigurationFactory;
@@ -56,6 +57,7 @@ public class OSGiNodeFactoryImpl extends NodeFactoryImpl {
         init();
 
         // Create a node configuration
+        FactoryExtensionPoint modelFactories = registry.getExtensionPoint(FactoryExtensionPoint.class);
         NodeConfigurationFactory configurationFactory = modelFactories.getFactory(NodeConfigurationFactory.class);
         NodeConfiguration configuration = configurationFactory.createNodeConfiguration();
 
@@ -86,7 +88,7 @@ public class OSGiNodeFactoryImpl extends NodeFactoryImpl {
             // Register the ExtensionPointRegistry as an OSGi service
             Dictionary<Object, Object> props = new Hashtable<Object, Object>();
             registration =
-                bundleContext.registerService(ExtensionPointRegistry.class.getName(), extensionPoints, props);
+                bundleContext.registerService(ExtensionPointRegistry.class.getName(), registry, props);
         }
     }
 
diff --git a/java/sca/modules/node-impl/META-INF/MANIFEST.MF b/java/sca/modules/node-impl/META-INF/MANIFEST.MF
index 2094b9cdad..6e14e309ef 100644
--- a/java/sca/modules/node-impl/META-INF/MANIFEST.MF
+++ b/java/sca/modules/node-impl/META-INF/MANIFEST.MF
@@ -1,13 +1,25 @@
 Manifest-Version: 1.0

-Export-Package: org.apache.tuscany.sca.node.impl;uses:="org.apache.tus

- cany.sca.runtime,org.apache.tuscany.sca.definitions,org.apache.tuscan

- y.sca.core,javax.xml.namespace,javax.xml.stream,org.apache.tuscany.sc

- a.core.assembly,org.apache.tuscany.sca.contribution.resolver,org.apac

- he.tuscany.sca.workspace,org.apache.tuscany.sca.core.invocation,org.o

- soa.sca,org.apache.tuscany.sca.assembly.builder,org.apache.tuscany.sc

- a.assembly,org.apache.tuscany.sca.node,org.apache.tusc any.sca.contri

- bution,org.apache.tuscany.sca.monitor,org.apache.tuscany.sca.work,org

- .apache.tuscany.sca.contribution.processor";version="2.0.0"

+Export-Package: org.apache.tuscany.sca.deployment;version="2.0.0";

+  uses:="javax.xml.stream,

+   org.apache.tuscany.sca.assembly,

+   org.apache.tuscany.sca.contribution.processor,

+   org.apache.tuscany.sca.core,

+   org.apache.tuscany.sca.contribution,

+   org.apache.tuscany.sca.monitor,

+   org.apache.tuscany.sca.assembly.builder",

+ org.apache.tuscany.sca.deployment.impl;version="2.0.0";

+  uses:="org.apache.tuscany.sca.assembly,

+   org.apache.tuscany.sca.definitions,

+   org.apache.tuscany.sca.common.xml.stax,

+   org.apache.tuscany.sca.core,

+   org.apache.tuscany.sca.contribution,

+   org.apache.tuscany.sca.deployment,

+   org.apache.tuscany.sca.monitor,

+   javax.xml.stream,

+   org.apache.tuscany.sca.contribution.resolver,

+   org.apache.tuscany.sca.contribution.processor,

+   org.apache.tuscany.sca.assembly.builder",

+ org.apache.tuscany.sca.node.impl;version="2.0.0"

 Tool: Bnd-0.0.255

 Bundle-Name: Apache Tuscany SCA Node Implementation

 Created-By: 1.6.0_07 (Sun Microsystems Inc.)

@@ -34,6 +46,7 @@ Import-Package: javax.management;resolution:=optional,
  org.apache.tuscany.sca.definitions;version="2.0.0",

  org.apache.tuscany.sca.definitions.util;version="2.0.0",

  org.apache.tuscany.sca.definitions.xml;version="2.0.0",

+ org.apache.tuscany.sca.deployment;version="2.0.0",

  org.apache.tuscany.sca.extensibility;version="2.0.0",

  org.apache.tuscany.sca.management;version="2.0.0",

  org.apache.tuscany.sca.monitor;version="2.0.0",

diff --git a/java/sca/modules/node-impl/src/main/java/org/apache/tuscany/sca/deployment/Deployer.java b/java/sca/modules/node-impl/src/main/java/org/apache/tuscany/sca/deployment/Deployer.java
new file mode 100644
index 0000000000..3d7b99612e
--- /dev/null
+++ b/java/sca/modules/node-impl/src/main/java/org/apache/tuscany/sca/deployment/Deployer.java
@@ -0,0 +1,189 @@
+/*
+ * 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.deployment;
+
+import java.io.Reader;
+import java.io.Writer;
+import java.net.URI;
+import java.net.URL;
+import java.util.List;
+import java.util.Map;
+
+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.assembly.Composite;
+import org.apache.tuscany.sca.assembly.builder.BuilderContext;
+import org.apache.tuscany.sca.assembly.builder.CompositeBuilderException;
+import org.apache.tuscany.sca.contribution.Artifact;
+import org.apache.tuscany.sca.contribution.Contribution;
+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.core.ExtensionPointRegistry;
+import org.apache.tuscany.sca.core.LifeCycleListener;
+import org.apache.tuscany.sca.monitor.Monitor;
+
+/**
+ * A utility that provides system functions to handle Tuscany SCA application deployment
+ */
+public interface Deployer extends LifeCycleListener {
+    /**
+     * Attach a deployment composite to the given contribution 
+     * @param contribution The target contribution
+     * @param composite The deployment composite
+     * @param appending A flag to indicate if existing deployable composites in the contribution should be appended or replaced
+     */
+    void attachDeploymentComposite(Contribution contribution, Composite composite, boolean appending);
+
+    /**
+     * Configure a list of contributions to create a composite representing a view of the domain
+     * @param contributions
+     * @param bindingBaseURIs
+     * @param monitor
+     * @return
+     * @throws ContributionResolveException
+     * @throws CompositeBuilderException
+     */
+    Composite build(List<Contribution> contributions, Map<QName, List<String>> bindingBaseURIs, Monitor monitor)
+        throws ContributionResolveException, CompositeBuilderException;
+
+    /**
+     * Create an instance of {@link BuilderContext}
+     * @return
+     */
+    BuilderContext createBuilderContext();
+
+    /**
+     * Create an instance of {@link ProcessorContext}
+     * @return
+     */
+    ProcessorContext createProcessorContext();
+
+    /**
+     * Get the {@link ExtensionPointRegistry}
+     * @return
+     */
+    ExtensionPointRegistry getExtensionPointRegistry();
+
+    /**
+     * Load an artifact from the given location
+     * @param uri
+     * @param location
+     * @param monitor
+     * @return
+     * @throws ContributionReadException
+     */
+    Artifact loadArtifact(URI uri, URL location, Monitor monitor) throws ContributionReadException;
+
+    /**
+     * Load a contribution from the given location
+     * @param uri
+     * @param location
+     * @param monitor
+     * @return
+     * @throws ContributionReadException
+     */
+    Contribution loadContribution(URI uri, URL location, Monitor monitor) throws ContributionReadException;
+
+    /**
+     * @param <T>
+     * @param uri
+     * @param location
+     * @param monitor
+     * @return
+     * @throws ContributionReadException
+     */
+    <T> T loadDocument(URI uri, URL location, Monitor monitor) throws ContributionReadException;
+
+    /**
+     * @param <T>
+     * @param reader
+     * @param monitor
+     * @return
+     * @throws XMLStreamException
+     * @throws ContributionReadException
+     */
+    <T> T loadXMLDocument(Reader reader, Monitor monitor) throws XMLStreamException, ContributionReadException;
+
+    /**
+     * @param <T>
+     * @param location
+     * @param monitor
+     * @return
+     * @throws XMLStreamException
+     * @throws ContributionReadException
+     */
+    <T> T loadXMLDocument(URL location, Monitor monitor) throws XMLStreamException, ContributionReadException;
+
+    /**
+     * @param <T>
+     * @param reader
+     * @param monitor
+     * @return
+     * @throws ContributionReadException
+     * @throws XMLStreamException
+     */
+    <T> T loadXMLElement(XMLStreamReader reader, Monitor monitor) throws ContributionReadException, XMLStreamException;
+
+    /**
+     * Save the model as XML
+     * @param model
+     * @param writer
+     * @param monitor
+     * @throws XMLStreamException
+     * @throws ContributionWriteException
+     */
+    void saveXMLDocument(Object model, Writer writer, Monitor monitor) throws XMLStreamException,
+        ContributionWriteException;
+
+    /**
+     * Save the model as XML
+     * @param model
+     * @param writer
+     * @param monitor
+     * @throws XMLStreamException
+     * @throws ContributionWriteException
+     */
+    void saveXMLElement(Object model, XMLStreamWriter writer, Monitor monitor) throws XMLStreamException,
+        ContributionWriteException;
+
+    /* 
+     * @see org.apache.tuscany.sca.core.LifeCycleListener#start()
+     */
+    void start();
+
+    /* 
+     * @see org.apache.tuscany.sca.core.LifeCycleListener#stop()
+     */
+    void stop();
+    
+    /**
+     * @return
+     */
+    boolean isSchemaValidationEnabled();
+    /**
+     * @param schemaValidationEnabled
+     */
+    void setSchemaValidationEnabled(boolean schemaValidationEnabled);
+}
diff --git a/java/sca/modules/node-impl/src/main/java/org/apache/tuscany/sca/deployment/impl/DeployerImpl.java b/java/sca/modules/node-impl/src/main/java/org/apache/tuscany/sca/deployment/impl/DeployerImpl.java
new file mode 100644
index 0000000000..5449230bc9
--- /dev/null
+++ b/java/sca/modules/node-impl/src/main/java/org/apache/tuscany/sca/deployment/impl/DeployerImpl.java
@@ -0,0 +1,540 @@
+/*
+ * 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.deployment.impl;
+
+import static java.lang.System.currentTimeMillis;
+
+import java.io.Reader;
+import java.io.Writer;
+import java.net.URI;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+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.assembly.AssemblyFactory;
+import org.apache.tuscany.sca.assembly.Base;
+import org.apache.tuscany.sca.assembly.Composite;
+import org.apache.tuscany.sca.assembly.builder.BuilderContext;
+import org.apache.tuscany.sca.assembly.builder.BuilderExtensionPoint;
+import org.apache.tuscany.sca.assembly.builder.CompositeBuilder;
+import org.apache.tuscany.sca.assembly.builder.CompositeBuilderException;
+import org.apache.tuscany.sca.common.xml.stax.StAXHelper;
+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.Export;
+import org.apache.tuscany.sca.contribution.Import;
+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.ExtendedURLArtifactProcessor;
+import org.apache.tuscany.sca.contribution.processor.ExtensibleStAXArtifactProcessor;
+import org.apache.tuscany.sca.contribution.processor.ExtensibleURLArtifactProcessor;
+import org.apache.tuscany.sca.contribution.processor.ProcessorContext;
+import org.apache.tuscany.sca.contribution.processor.URLArtifactProcessorExtensionPoint;
+import org.apache.tuscany.sca.contribution.processor.ValidatingXMLInputFactory;
+import org.apache.tuscany.sca.contribution.processor.ValidationSchemaExtensionPoint;
+import org.apache.tuscany.sca.contribution.resolver.DefaultImportModelResolver;
+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.ExtensionPointRegistry;
+import org.apache.tuscany.sca.core.FactoryExtensionPoint;
+import org.apache.tuscany.sca.core.ModuleActivatorExtensionPoint;
+import org.apache.tuscany.sca.core.UtilityExtensionPoint;
+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.definitions.xml.DefinitionsExtensionPoint;
+import org.apache.tuscany.sca.deployment.Deployer;
+import org.apache.tuscany.sca.monitor.Monitor;
+import org.apache.tuscany.sca.monitor.MonitorFactory;
+import org.apache.tuscany.sca.node.impl.Contributions;
+import org.apache.tuscany.sca.node.impl.NodeImpl;
+
+/**
+ * 
+ */
+public class DeployerImpl implements Deployer {
+    protected static final Logger logger = Logger.getLogger(NodeImpl.class.getName());
+
+    protected boolean inited;
+    protected boolean schemaValidationEnabled;
+    protected StAXHelper staxHelper;
+    protected AssemblyFactory assemblyFactory;
+    protected CompositeBuilder compositeBuilder;
+    protected ContributionFactory contributionFactory;
+    protected ExtendedURLArtifactProcessor<Contribution> contributionProcessor;
+    protected ExtensionPointRegistry registry;
+    protected FactoryExtensionPoint modelFactories;
+    protected ModelResolverExtensionPoint modelResolvers;
+    protected Contribution systemContribution;
+    protected Definitions systemDefinitions;
+    protected ExtensibleURLArtifactProcessor artifactProcessor;
+    protected ExtensibleStAXArtifactProcessor staxProcessor;
+
+    protected MonitorFactory monitorFactory;
+
+    protected static final String NODE_IMPL_VALIDATION_MESSAGES =
+        "org.apache.tuscany.sca.node.impl.node-impl-validation-messages";
+
+    /**
+     * @param registry
+     */
+    public DeployerImpl(ExtensionPointRegistry registry) {
+        super();
+        this.registry = registry;
+    }
+    
+    public synchronized void stop() {
+        if (inited) {
+            staxHelper = null;
+            assemblyFactory = null;
+            compositeBuilder = null;
+            contributionFactory = null;
+            contributionProcessor = null;
+            modelFactories = null;
+            modelResolvers = null;
+            systemContribution = null;
+            systemDefinitions = null;
+            artifactProcessor = null;
+            staxProcessor = null;
+            monitorFactory = null;
+            inited = false;
+        }
+    }
+
+    /**
+     * Analyze a contribution and add its dependencies to the given dependency set.
+     */
+    protected void addContributionDependencies(Contribution contribution,
+                                             List<Contribution> contributions,
+                                             List<Contribution> dependencies,
+                                             Set<Contribution> set,
+                                             Monitor monitor) {
+
+        // Go through the contribution imports
+        for (Import import_ : contribution.getImports()) {
+            boolean resolved = false;
+
+            // Go through all contribution candidates and their exports
+            List<Export> matchingExports = new ArrayList<Export>();
+            for (Contribution dependency : contributions) {
+                if (dependency == contribution) {
+                    // Do not self import
+                    continue;
+                }
+                for (Export export : dependency.getExports()) {
+
+                    // If an export from a contribution matches the import in hand
+                    // add that contribution to the dependency set
+                    if (import_.match(export)) {
+                        resolved = true;
+                        matchingExports.add(export);
+
+                        if (!set.contains(dependency)) {
+                            set.add(dependency);
+                            dependencies.add(dependency);
+
+                            // Now add the dependencies of that contribution
+                            addContributionDependencies(dependency, contributions, dependencies, set, monitor);
+                        } // end if
+                    } // end if 
+                } // end for
+            } // end for
+
+            if (resolved) {
+                // Initialize the import's model resolver with a delegating model
+                // resolver which will delegate to the matching exports
+                import_.setModelResolver(new DefaultImportModelResolver(matchingExports));
+
+            } else {
+                // Record import resolution issue
+                if (!(import_ instanceof DefaultImport)) {
+                    // Add the (empty) matchingExports List and report a warning
+                    import_.setModelResolver(new DefaultImportModelResolver(matchingExports));
+                    Monitor.error(monitor, this, NODE_IMPL_VALIDATION_MESSAGES, "UnresolvedImport", import_);
+                }
+            } // end if
+        }
+    }
+
+    protected void buildDependencies(Contribution contribution, List<Contribution> contributions, Monitor monitor) {
+        contribution.getDependencies().clear();
+
+        List<Contribution> dependencies = new ArrayList<Contribution>();
+        Set<Contribution> set = new HashSet<Contribution>();
+
+        dependencies.add(contribution);
+        set.add(contribution);
+        addContributionDependencies(contribution, contributions, dependencies, set, monitor);
+
+        Collections.reverse(dependencies);
+
+        contribution.getDependencies().addAll(dependencies);
+    }
+
+    /**
+     * Pre-resolve phase for contributions, to set up handling of imports and exports prior to full resolution
+     * @param contributions - the contributions to preresolve
+     * @param resolver - the ModelResolver to use
+     * @throws ContributionResolveException
+     */
+    protected void contributionsPreresolve(List<Contribution> contributions,
+                                         ModelResolver resolver,
+                                         ProcessorContext context) throws ContributionResolveException {
+
+        for (Contribution contribution : contributions) {
+            contributionProcessor.preResolve(contribution, resolver, context);
+        } // end for
+    } // end method contributionsPreresolve
+
+    public ExtensionPointRegistry getExtensionPointRegistry() {
+        return registry;
+    }
+    
+    public synchronized void start() {
+        if (inited) {
+            return;
+        }
+        long start = currentTimeMillis();
+
+        // Enable schema validation only of the logger level is FINE or higher
+        if (isSchemaValidationEnabled()) {
+            ValidationSchemaExtensionPoint schemas =
+                registry.getExtensionPoint(ValidationSchemaExtensionPoint.class);
+            if (schemas != null) {
+                schemas.setEnabled(true);
+            }
+        }
+
+        // Use the runtime-enabled assembly factory
+        modelFactories = registry.getExtensionPoint(FactoryExtensionPoint.class);
+        assemblyFactory = modelFactories.getFactory(AssemblyFactory.class);
+
+        // Create a monitor
+        UtilityExtensionPoint utilities = registry.getExtensionPoint(UtilityExtensionPoint.class);
+        staxHelper = utilities.getUtility(StAXHelper.class);
+
+        monitorFactory = utilities.getUtility(MonitorFactory.class);
+
+        // Initialize the Tuscany module activators
+        // The module activators will be started
+        registry.getExtensionPoint(ModuleActivatorExtensionPoint.class);
+
+        // Get contribution workspace and assembly model factories
+        contributionFactory = modelFactories.getFactory(ContributionFactory.class);
+
+        // Create XML artifact processors
+        staxProcessor = new ExtensibleStAXArtifactProcessor(registry);
+
+        // Create contribution content processor
+        URLArtifactProcessorExtensionPoint docProcessorExtensions =
+            registry.getExtensionPoint(URLArtifactProcessorExtensionPoint.class);
+        artifactProcessor = new ExtensibleURLArtifactProcessor(docProcessorExtensions);
+        
+        contributionProcessor =
+            (ExtendedURLArtifactProcessor<Contribution>)docProcessorExtensions.getProcessor(Contribution.class);
+
+        // Get the model resolvers
+        modelResolvers = registry.getExtensionPoint(ModelResolverExtensionPoint.class);
+
+        // Get composite builders
+        BuilderExtensionPoint compositeBuilders = registry.getExtensionPoint(BuilderExtensionPoint.class);
+        compositeBuilder =
+            compositeBuilders.getCompositeBuilder("org.apache.tuscany.sca.assembly.builder.CompositeBuilder");
+
+        loadSystemContribution(monitorFactory.createMonitor());
+
+        inited = true;
+
+        if (logger.isLoggable(Level.FINE)) {
+            long end = currentTimeMillis();
+            logger.fine("The tuscany runtime started in " + (end - start) + " ms.");
+        }
+    }
+
+    protected void loadSystemContribution(Monitor monitor) {
+        DefinitionsFactory definitionsFactory = modelFactories.getFactory(DefinitionsFactory.class);
+        systemDefinitions = definitionsFactory.createDefinitions();
+
+        DefinitionsExtensionPoint definitionsExtensionPoint =
+            registry.getExtensionPoint(DefinitionsExtensionPoint.class);
+        monitor.pushContext("Extension points definitions");
+        try {
+            for (Definitions defs : definitionsExtensionPoint.getDefinitions()) {
+                DefinitionsUtil.aggregate(defs, systemDefinitions, monitor);
+            }
+        } finally {
+            monitor.popContext();
+        }
+
+        // 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);
+    }
+    
+    protected Contribution cloneSystemContribution(Monitor monitor) {
+        start();
+        Contribution contribution = contributionFactory.createContribution();
+        contribution.setURI(systemContribution.getURI());
+        contribution.setLocation(systemContribution.getLocation());
+        ModelResolver modelResolver = new ExtensibleModelResolver(contribution, modelResolvers, modelFactories);
+        contribution.setModelResolver(modelResolver);
+        contribution.setUnresolved(true);
+
+        DefinitionsFactory definitionsFactory = modelFactories.getFactory(DefinitionsFactory.class);
+        Definitions definitions = definitionsFactory.createDefinitions();
+        DefinitionsUtil.aggregate(systemDefinitions, definitions, monitor);
+        // create an artifact to represent the system defintions and
+        // add it to the contribution
+        List<Artifact> artifacts = contribution.getArtifacts();
+        Artifact artifact = contributionFactory.createArtifact();
+        artifact.setURI("http://tuscany.apache.org/SystemContribution/Definitions");
+        artifact.setLocation("Derived");
+        artifact.setModel(definitions);
+        artifacts.add(artifact);
+        return contribution;
+    }
+
+    public void attachDeploymentComposite(Contribution contribution, Composite composite, boolean appending) {
+        start();
+        // Create an artifact for the deployment composite
+        Artifact artifact = contributionFactory.createArtifact();
+        String uri = composite.getName().getLocalPart() + ".composite";
+        artifact.setURI(uri);
+
+        artifact.setLocation(uri);
+        artifact.setModel(composite);
+        artifact.setUnresolved(false);
+        // Add it to the contribution
+        contribution.getArtifacts().add(artifact);
+
+        // Replace the deployable composites with the deployment composites
+        // Clear the deployable composites if it's the first deployment composite
+        if (!appending) {
+            contribution.getDeployables().clear();
+        }
+        contribution.getDeployables().add(composite);
+    }
+
+    public Composite build(List<Contribution> contributions, Map<QName, List<String>> bindingMap, Monitor monitor) throws ContributionResolveException, CompositeBuilderException {
+        start();
+        Contribution systemContribution = cloneSystemContribution(monitor);
+        Definitions systemDefinitions = systemContribution.getArtifacts().get(0).getModel();
+        // 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
+        ProcessorContext context = new ProcessorContext(monitor);
+        for (Contribution contribution : contributions) {
+            monitor.pushContext("Contribution: " + contribution.getURI());
+            try {
+                // aggregate definitions
+                for (Artifact artifact : contribution.getArtifacts()) {
+                    if (!"META-INF/definitions.xml".equals(artifact.getURI())) {
+                        continue;
+                    }
+                    Object model = artifact.getModel();
+                    // FIXME: Should we check the artifact URI is META-INF/definitions.xml?
+                    if (model instanceof Definitions) {
+                        monitor.pushContext("Definitions: " + artifact.getLocation());
+                        DefinitionsUtil.aggregate((Definitions)model, systemDefinitions, monitor);
+                    }
+                }
+
+                // 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);
+            } finally {
+                monitor.popContext();
+            }
+        }
+
+        ExtensibleModelResolver modelResolver =
+            new ExtensibleModelResolver(new Contributions(contributions), modelResolvers, modelFactories);
+
+        // now resolve and add the system contribution
+        contributionProcessor.resolve(systemContribution, modelResolver, context);
+        contributions.add(systemContribution);
+
+        // pre-resolve the contributions
+        contributionsPreresolve(contributions, modelResolver, context);
+
+        // Build the contribution dependencies
+        Set<Contribution> resolved = new HashSet<Contribution>();
+        for (Contribution contribution : contributions) {
+            buildDependencies(contribution, contributions, monitor);
+
+            // Resolve contributions
+            for (Contribution dependency : contribution.getDependencies()) {
+                if (!resolved.contains(dependency)) {
+                    resolved.add(dependency);
+                    contributionProcessor.resolve(dependency, modelResolver, context);
+                }
+            }
+        }
+
+        // Create a top level composite to host our composite
+        // This is temporary to make the activator happy
+        Composite domainComposite = assemblyFactory.createComposite();
+        domainComposite.setName(Composite.DOMAIN_COMPOSITE);
+        domainComposite.setURI(Base.SCA11_NS);
+
+        for (Contribution contribution : contributions) {
+            for (Composite composite : contribution.getDeployables()) {
+                // Include the node composite in the top-level composite
+                domainComposite.getIncludes().add(composite);
+            }
+        }
+
+        // build the top level composite
+        BuilderContext builderContext = new BuilderContext(systemDefinitions, bindingMap, monitor);
+        compositeBuilder.build(domainComposite, builderContext);
+        // analyzeProblems(monitor);
+
+        return domainComposite;
+    }
+
+    public Artifact loadArtifact(URI uri, URL location, Monitor monitor) throws ContributionReadException {
+        start();
+        Artifact artifact = contributionFactory.createArtifact();
+        artifact.setLocation(location.toString());
+        artifact.setURI(uri.toString());
+        URLArtifactProcessorExtensionPoint artifactProcessors =
+            registry.getExtensionPoint(URLArtifactProcessorExtensionPoint.class);
+        ExtensibleURLArtifactProcessor processor = new ExtensibleURLArtifactProcessor(artifactProcessors);
+        Object model = processor.read(null, uri, location, new ProcessorContext(monitor));
+        artifact.setModel(model);
+        return artifact;
+    }
+    
+    @SuppressWarnings("unchecked")
+    public <T> T loadDocument(URI uri, URL location, Monitor monitor) throws ContributionReadException {
+        start();
+        Object model = artifactProcessor.read(null, uri, location, new ProcessorContext(monitor));
+        return (T) model;
+    }
+
+    public <T> T loadXMLDocument(URL document, Monitor monitor) throws XMLStreamException, ContributionReadException {
+        start();
+        XMLStreamReader reader = staxHelper.createXMLStreamReader(document);
+        reader.nextTag();
+        ValidatingXMLInputFactory.setMonitor(reader, monitor);
+        try {
+            return loadXMLElement(reader, monitor);
+        } finally {
+            reader.close();
+        }
+    }
+    
+    public void saveXMLDocument(Object model, Writer writer, Monitor monitor) throws XMLStreamException,
+        ContributionWriteException {
+        start();
+        XMLStreamWriter streamWriter = staxHelper.createXMLStreamWriter(writer);
+        staxProcessor.write(model, streamWriter, new ProcessorContext(monitor));
+    }
+
+    public void saveXMLElement(Object model, XMLStreamWriter writer, Monitor monitor)
+        throws XMLStreamException, ContributionWriteException {
+        start();
+        staxProcessor.write(model, writer, new ProcessorContext(monitor));
+    }
+
+    @SuppressWarnings("unchecked")
+    public <T> T loadXMLElement(XMLStreamReader reader, Monitor monitor) throws ContributionReadException,
+        XMLStreamException {
+        start();
+        return (T)staxProcessor.read(reader, new ProcessorContext(monitor));
+    }
+    
+    public <T> T loadXMLDocument(Reader document, Monitor monitor) throws XMLStreamException, ContributionReadException {
+        start();
+        XMLStreamReader reader = staxHelper.createXMLStreamReader(document);
+        ValidatingXMLInputFactory.setMonitor(reader, monitor);
+        reader.nextTag();
+        try {
+            return loadXMLElement(reader, monitor);
+        } finally {
+            reader.close();
+        }
+    }
+
+    public Contribution loadContribution(URI uri, URL location, Monitor monitor) throws ContributionReadException {
+        start();
+        ProcessorContext context = new ProcessorContext(monitor);
+        // Load the contribution
+        Contribution contribution = contributionProcessor.read(null, uri, location, context);
+        return contribution;
+    }
+    
+    public ProcessorContext createProcessorContext() {
+        start();
+        return new ProcessorContext(monitorFactory.createMonitor());
+    }
+    
+    public BuilderContext createBuilderContext() {
+        start();
+        return new BuilderContext(monitorFactory.createMonitor());
+    }
+
+    public boolean isSchemaValidationEnabled() {
+        return schemaValidationEnabled;
+    }
+
+    public void setSchemaValidationEnabled(boolean schemaValidationEnabled) {
+        this.schemaValidationEnabled = schemaValidationEnabled;
+    }
+
+}
diff --git a/java/sca/modules/node-impl/src/main/java/org/apache/tuscany/sca/node/impl/NodeFactoryImpl.java b/java/sca/modules/node-impl/src/main/java/org/apache/tuscany/sca/node/impl/NodeFactoryImpl.java
index 06ada62a25..1c2ea6b921 100644
--- a/java/sca/modules/node-impl/src/main/java/org/apache/tuscany/sca/node/impl/NodeFactoryImpl.java
+++ b/java/sca/modules/node-impl/src/main/java/org/apache/tuscany/sca/node/impl/NodeFactoryImpl.java
@@ -29,52 +29,28 @@ import java.io.InputStreamReader;
 import java.io.Reader;
 import java.io.StringReader;
 import java.net.URI;
-import java.net.URISyntaxException;
 import java.net.URL;
 import java.security.AccessController;
 import java.security.PrivilegedAction;
 import java.util.ArrayList;
-import java.util.Collections;
 import java.util.HashMap;
-import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
-import java.util.Set;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 
 import javax.xml.namespace.QName;
-import javax.xml.stream.XMLInputFactory;
 import javax.xml.stream.XMLStreamException;
-import javax.xml.stream.XMLStreamReader;
 
 import org.apache.tuscany.sca.assembly.AssemblyFactory;
-import org.apache.tuscany.sca.assembly.Base;
 import org.apache.tuscany.sca.assembly.Composite;
-import org.apache.tuscany.sca.assembly.builder.BuilderContext;
-import org.apache.tuscany.sca.assembly.builder.BuilderExtensionPoint;
-import org.apache.tuscany.sca.assembly.builder.CompositeBuilder;
 import org.apache.tuscany.sca.common.java.io.IOHelper;
-import org.apache.tuscany.sca.common.xml.stax.StAXHelper;
 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.Export;
-import org.apache.tuscany.sca.contribution.Import;
 import org.apache.tuscany.sca.contribution.processor.ContributionReadException;
-import org.apache.tuscany.sca.contribution.processor.ContributionResolveException;
-import org.apache.tuscany.sca.contribution.processor.ExtendedURLArtifactProcessor;
 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.contribution.processor.URLArtifactProcessorExtensionPoint;
 import org.apache.tuscany.sca.contribution.processor.ValidationSchemaExtensionPoint;
-import org.apache.tuscany.sca.contribution.resolver.DefaultImportModelResolver;
-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;
@@ -84,12 +60,8 @@ 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.definitions.xml.DefinitionsExtensionPoint;
-import org.apache.tuscany.sca.extensibility.ServiceDeclaration;
-import org.apache.tuscany.sca.extensibility.ServiceDiscovery;
+import org.apache.tuscany.sca.deployment.Deployer;
+import org.apache.tuscany.sca.deployment.impl.DeployerImpl;
 import org.apache.tuscany.sca.monitor.Monitor;
 import org.apache.tuscany.sca.monitor.MonitorFactory;
 import org.apache.tuscany.sca.monitor.Problem;
@@ -113,20 +85,9 @@ public class NodeFactoryImpl extends NodeFactory {
     protected boolean inited;
     protected Map<Object, Node> nodes = new ConcurrentHashMap<Object, Node>();
 
-    private AssemblyFactory assemblyFactory;
-    private CompositeBuilder compositeBuilder;
-    private StAXArtifactProcessor<Composite> compositeProcessor;
-    private ContributionFactory contributionFactory;
-    private ExtendedURLArtifactProcessor<Contribution> contributionProcessor;
-    protected ExtensionPointRegistry extensionPoints;
-    private XMLInputFactory inputFactory;
-    protected FactoryExtensionPoint modelFactories;
-    private ModelResolverExtensionPoint modelResolvers;
+    protected Deployer deployer;
+    protected ExtensionPointRegistry registry;
     protected ProxyFactory proxyFactory;
-    private Contribution systemContribution;
-    private Definitions systemDefinitions;
-    private StAXArtifactProcessorExtensionPoint xmlProcessors;
-    
     protected MonitorFactory monitorFactory;
 
 
@@ -153,33 +114,13 @@ public class NodeFactoryImpl extends NodeFactory {
         nodes.put(getNodeKey(configuration), node);
     }
 
-    /**
-     * @param <T>
-     * @param factory
-     * @return
-     * @throws Exception
-     */
-    private <T> T getFactory(Class<T> factory) throws Exception {
-        ServiceDeclaration sd = ServiceDiscovery.getInstance().getServiceDeclaration(factory.getName());
-        if (sd != null) {
-            return factory.cast(sd.loadClass().newInstance());
-        } else {
-            return factory.cast(factory.getMethod("newInstance").invoke(null));
-        }
-    }
-
     @Override
     public NodeConfiguration loadConfiguration(InputStream xml, URL base) {
         try {
             init();
-            StAXHelper helper = StAXHelper.getInstance(extensionPoints);
-            XMLStreamReader reader = helper.createXMLStreamReader(xml);
-            StAXArtifactProcessorExtensionPoint processors =
-                extensionPoints.getExtensionPoint(StAXArtifactProcessorExtensionPoint.class);
-            StAXArtifactProcessor processor = processors.getProcessor(NodeConfiguration.class);
-            reader.nextTag();
-            NodeConfiguration config = (NodeConfiguration)processor.read(reader, new ProcessorContext(extensionPoints));
-            xml.close();
+            InputStreamReader reader = new InputStreamReader(xml, "UTF-8");
+            ProcessorContext context = deployer.createProcessorContext();
+            NodeConfiguration config = deployer.loadXMLDocument(reader, context.getMonitor());
             if (base != null && config != null) {
                 // Resolve the contribution location against the node.xml
                 for (ContributionConfiguration c : config.getContributions()) {
@@ -197,20 +138,6 @@ public class NodeFactoryImpl extends NodeFactory {
         }
     }
     
-    private File toFile(URL url) {
-        if("file".equalsIgnoreCase(url.getProtocol())) {
-            try {
-                return new File(url.toURI());
-            } catch(URISyntaxException e) {
-                return new File(url.getPath());
-            } catch(IllegalArgumentException e) {
-                // Hack for file:./a.txt or file:../a/c.wsdl
-                return new File(url.getPath());
-            }
-        }
-        return null;
-    }
-
     public Map<Object, Node> getNodes() {
         return nodes;
     }
@@ -226,81 +153,12 @@ public class NodeFactoryImpl extends NodeFactory {
                 node.destroy();
             }
             nodes.clear();
-            extensionPoints.stop();
+            deployer.stop();
+            registry.stop();
             inited = false;
         }
     }
 
-    protected static String getSystemProperty(final String name) {
-        return AccessController.doPrivileged(new PrivilegedAction<String>() {
-            public String run() {
-                return System.getProperty(name);
-            }
-        });
-    }
-
-    private static void warning(Monitor monitor, String message, Object model, Object... messageParameters) {
-        if (monitor != null) {
-            Problem problem = monitor.createProblem(NodeImpl.class.getName(), "node-impl-validation-messages", Severity.WARNING, model, message, (Object[])messageParameters);
-            monitor.problem(problem);
-        }
-    }
-
-    /**
-     * Analyze a contribution and add its dependencies to the given dependency set.
-     */
-    private void addContributionDependencies(Contribution contribution, List<Contribution> contributions, List<Contribution> dependencies, Set<Contribution> set, Monitor monitor) {
-
-        // Go through the contribution imports
-        for (Import import_: contribution.getImports()) {
-            boolean resolved = false;
-
-            // Go through all contribution candidates and their exports
-            List<Export> matchingExports = new ArrayList<Export>();
-            for (Contribution dependency: contributions) {
-                if (dependency == contribution) {
-                    // Do not self import
-                    continue;
-                }
-                for (Export export: dependency.getExports()) {
-
-                    // If an export from a contribution matches the import in hand
-                    // add that contribution to the dependency set
-                    if (import_.match(export)) {
-                        resolved = true;
-                        matchingExports.add(export);
-
-                        if (!set.contains(dependency)) {
-                            set.add(dependency);
-                            dependencies.add(dependency);
-
-                            // Now add the dependencies of that contribution
-                            addContributionDependencies(dependency, contributions, dependencies, set, monitor);
-                        } // end if
-                    } // end if 
-                } // end for
-            } // end for
-
-            if (resolved) {
-                // Initialize the import's model resolver with a delegating model
-                // resolver which will delegate to the matching exports
-                import_.setModelResolver(new DefaultImportModelResolver(matchingExports));
-
-            } else {
-                // Record import resolution issue
-                if (!(import_ instanceof DefaultImport)) {
-                	// Add the (empty) matchingExports List and report a warning
-                	import_.setModelResolver(new DefaultImportModelResolver(matchingExports));
-                	Monitor.error(monitor, 
-                	              this, 
-                	              "node-impl-validation-messages", 
-                	              "UnresolvedImport", 
-                	              import_);
-                }
-            } // end if
-        }
-    }
-
     /**
      * Analyze problems reported by the artifact processors and builders.
      *
@@ -325,78 +183,21 @@ public class NodeFactoryImpl extends NodeFactory {
 
     private boolean attachDeploymentComposite(Contribution contribution, Reader xml, String location, boolean attached, ProcessorContext context)
         throws XMLStreamException, ContributionReadException {
-        XMLStreamReader reader = inputFactory.createXMLStreamReader(xml);
-        reader.nextTag();
 
         // Read the composite model
-        Composite composite = (Composite)compositeProcessor.read(reader, context);
-        reader.close();
-
-        // Create an artifact for the deployment composite
-        Artifact artifact = contributionFactory.createArtifact();
-        String uri = composite.getName().getLocalPart() + ".composite";
-        artifact.setURI(uri);
-        // Set the location to avoid NPE
-        if (location == null) {
-            location = uri;
-        }
-        artifact.setLocation(location);
-        artifact.setModel(composite);
-        artifact.setUnresolved(false);
-        // Add it to the contribution
-        contribution.getArtifacts().add(artifact);
+        Composite composite = deployer.loadXMLDocument(xml, context.getMonitor());
 
         // Replace the deployable composites with the deployment composites
         // Clear the deployable composites if it's the first deployment composite
+        deployer.attachDeploymentComposite(contribution, composite, attached);
         if (!attached) {
-            contribution.getDeployables().clear();
             attached = true;
-        }
-        contribution.getDeployables().add(composite);
-
+        } 
         return attached;
     }
 
-    private void buildDependencies(Contribution contribution, List<Contribution> contributions, Monitor monitor) {
-        contribution.getDependencies().clear();
-
-        List<Contribution> dependencies = new ArrayList<Contribution>();
-        Set<Contribution> set = new HashSet<Contribution>();
-
-        dependencies.add(contribution);
-        set.add(contribution);
-        addContributionDependencies(contribution, contributions, dependencies, set, monitor);
-
-        Collections.reverse(dependencies);
-
-        contribution.getDependencies().addAll(dependencies);
-    }
-
-    /**
-     * Pre-resolve phase for contributions, to set up handling of imports and exports prior to full resolution
-     * @param contributions - the contributions to preresolve
-     * @param resolver - the ModelResolver to use
-     * @throws ContributionResolveException
-     */
-    private void contributionsPreresolve( List<Contribution> contributions, ModelResolver resolver, ProcessorContext context)
-        throws ContributionResolveException {
-
-        for( Contribution contribution : contributions ) {
-                contributionProcessor.preResolve(contribution, resolver, context);
-        } // end for
-    } // end method contributionsPreresolve
-
     public ExtensionPointRegistry getExtensionPoints() {
-        return extensionPoints;
-    }
-
-    protected boolean isSchemaValidationEnabled() {
-        String enabled = getSystemProperty(ValidationSchemaExtensionPoint.class.getName() + ".enabled");
-        if (enabled == null) {
-            enabled = "true";
-        }
-        boolean debug = logger.isLoggable(Level.FINE);
-        return "true".equals(enabled) || debug;
+        return registry;
     }
 
     public synchronized void init() {
@@ -406,93 +207,37 @@ public class NodeFactoryImpl extends NodeFactory {
         long start = currentTimeMillis();
 
         // Create extension point registry
-        extensionPoints = createExtensionPointRegistry();
-        extensionPoints.start();
-
-        // Enable schema validation only of the logger level is FINE or higher
-        if (isSchemaValidationEnabled()) {
-            ValidationSchemaExtensionPoint schemas =
-                extensionPoints.getExtensionPoint(ValidationSchemaExtensionPoint.class);
-            if (schemas != null) {
-                schemas.setEnabled(true);
-            }
-        }
-
+        registry = createExtensionPointRegistry();
+        registry.start();
+        
         // Use the runtime-enabled assembly factory
-        modelFactories = extensionPoints.getExtensionPoint(FactoryExtensionPoint.class);
-        assemblyFactory = new RuntimeAssemblyFactory(extensionPoints);
+        FactoryExtensionPoint modelFactories = registry.getExtensionPoint(FactoryExtensionPoint.class);
+        AssemblyFactory assemblyFactory = new RuntimeAssemblyFactory(registry);
         modelFactories.addFactory(assemblyFactory);
 
+        deployer = new DeployerImpl(registry);
+
+        // Enable schema validation only of the logger level is FINE or higher
+        deployer.setSchemaValidationEnabled(isSchemaValidationEnabled());
+        deployer.start();
+
         // Create a monitor
-        UtilityExtensionPoint utilities = extensionPoints.getExtensionPoint(UtilityExtensionPoint.class);
+        UtilityExtensionPoint utilities = registry.getExtensionPoint(UtilityExtensionPoint.class);
 
         monitorFactory = utilities.getUtility(MonitorFactory.class);
 
         // Initialize the Tuscany module activators
         // The module activators will be started
-        extensionPoints.getExtensionPoint(ModuleActivatorExtensionPoint.class);
-
-        // Get XML input/output factories
-        inputFactory = modelFactories.getFactory(XMLInputFactory.class);
-
-        // Get contribution workspace and assembly model factories
-        contributionFactory = modelFactories.getFactory(ContributionFactory.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 = (ExtendedURLArtifactProcessor<Contribution>) docProcessorExtensions.getProcessor(Contribution.class);
-
-        // Get the model resolvers
-        modelResolvers = extensionPoints.getExtensionPoint(ModelResolverExtensionPoint.class);
-
-        // Get composite builders
-        BuilderExtensionPoint compositeBuilders = extensionPoints.getExtensionPoint(BuilderExtensionPoint.class);
-        compositeBuilder = compositeBuilders.getCompositeBuilder("org.apache.tuscany.sca.assembly.builder.CompositeBuilder");
+        registry.getExtensionPoint(ModuleActivatorExtensionPoint.class);
 
         // Initialize runtime
 
         // Get proxy factory
-        ProxyFactoryExtensionPoint proxyFactories = extensionPoints.getExtensionPoint(ProxyFactoryExtensionPoint.class);
+        ProxyFactoryExtensionPoint proxyFactories = registry.getExtensionPoint(ProxyFactoryExtensionPoint.class);
         proxyFactory = new ExtensibleProxyFactory(proxyFactories);
 
         utilities.getUtility(WorkScheduler.class);
 
-        DefinitionsFactory definitionsFactory = modelFactories.getFactory(DefinitionsFactory.class);
-        systemDefinitions = definitionsFactory.createDefinitions();
-
-        DefinitionsExtensionPoint definitionsExtensionPoint = extensionPoints.getExtensionPoint(DefinitionsExtensionPoint.class);
-        Monitor monitor = monitorFactory.createMonitor();
-        monitor.pushContext("Extension points definitions");
-        try {
-            for (Definitions defs : definitionsExtensionPoint.getDefinitions()) {
-                DefinitionsUtil.aggregate(defs, systemDefinitions, monitor);
-            }
-        } finally {
-            monitor.popContext();
-        }
-
-        // 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);
-
         inited = true;
 
         if (logger.isLoggable(Level.FINE)) {
@@ -504,6 +249,15 @@ public class NodeFactoryImpl extends NodeFactory {
     protected ExtensionPointRegistry createExtensionPointRegistry() {
         return new DefaultExtensionPointRegistry();
     }
+    
+    protected boolean isSchemaValidationEnabled() {
+        String enabled = getSystemProperty(ValidationSchemaExtensionPoint.class.getName() + ".enabled");
+        if (enabled == null) {
+            enabled = "true";
+        }
+        boolean debug = logger.isLoggable(Level.FINE);
+        return "true".equals(enabled) || debug;
+    }    
 
     protected Composite configureNode(NodeConfiguration configuration, List<Contribution> contributions, ProcessorContext context)
         throws Throwable {
@@ -511,87 +265,13 @@ public class NodeFactoryImpl extends NodeFactory {
             // Load contributions
             contributions = loadContributions(configuration, context);
         }
-        // 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
+        
         Monitor monitor = context.getMonitor();
-        for (Contribution contribution: contributions) {
-            monitor.pushContext("Contribution: " + contribution.getURI());
-            // aggregate definitions
-            for (Artifact artifact : contribution.getArtifacts()) {
-                Object model = artifact.getModel();
-                // FIXME: Should we check the artifact URI is META-INF/definitions.xml?
-                if (model instanceof Definitions) {
-                    monitor.pushContext("Definitions: " + artifact.getLocation());
-                    DefinitionsUtil.aggregate((Definitions)model, systemDefinitions, monitor);
-                    monitor.popContext();
-                }
-            }
-
-            // 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);
-            monitor.popContext();
-        }
-
-        ExtensibleModelResolver modelResolver = new ExtensibleModelResolver(new Contributions(contributions), modelResolvers, modelFactories);
-
-        // now resolve and add the system contribution
-        contributionProcessor.resolve(systemContribution, modelResolver, context);
-        contributions.add(systemContribution);
-
-        // TODO - Now we can calculate applicable policy sets for each composite
-
-        // pre-resolve the contributions
-        contributionsPreresolve(contributions, modelResolver, context);
-
-        // Build the contribution dependencies
-        Set<Contribution> resolved = new HashSet<Contribution>();
-        for (Contribution contribution: contributions) {
-            buildDependencies(contribution, contributions, monitor);
-
-            // Resolve contributions
-            for (Contribution dependency: contribution.getDependencies()) {
-                if (!resolved.contains(dependency)) {
-                    resolved.add(dependency);
-                    contributionProcessor.resolve(dependency, modelResolver, context);
-                }
-            }
-        }
-
-        // Create a top level composite to host our composite
-        // This is temporary to make the activator happy
-        Composite domainComposite = assemblyFactory.createComposite();
-        domainComposite.setName(Composite.DOMAIN_COMPOSITE);
-        domainComposite.setURI(Base.SCA11_NS);
-
-        for (Contribution contribution : contributions) {
-            for (Composite composite : contribution.getDeployables()) {
-                // Include the node composite in the top-level composite
-                domainComposite.getIncludes().add(composite);
-                logger.log(Level.INFO, "Adding composite: " + composite.getName() + " to domain " + getDomainURI());
-            }
-        }
-
-        // TODO - EPR - create a binding map to pass down into the builders
-        //              for use during URI calculation.
-        Map<QName, List<String>> bindingMap = new HashMap<QName, List<String>>();
+        Map<QName, List<String>> bindingBaseURIs = new HashMap<QName, List<String>>();
         for (BindingConfiguration config : configuration.getBindings()) {
-            bindingMap.put(config.getBindingType(), config.getBaseURIs());
+            bindingBaseURIs.put(config.getBindingType(), config.getBaseURIs());
         }
-
-        // build the top level composite
-        BuilderContext builderContext = new BuilderContext(systemDefinitions, bindingMap, monitor);
-        compositeBuilder.build(domainComposite, builderContext);
+        Composite domainComposite = deployer.build(contributions, bindingBaseURIs, monitor);
         analyzeProblems(monitor);
 
         return domainComposite;
@@ -612,7 +292,7 @@ public class NodeFactoryImpl extends NodeFactory {
 
             // Load the contribution
             logger.log(Level.INFO, "Loading contribution: " + contributionURL);
-            Contribution contribution = contributionProcessor.read(null, contributionURI, contributionURL, context);
+            Contribution contribution = deployer.loadContribution(contributionURI, contributionURL, context.getMonitor());
             contributions.add(contribution);
 
             boolean attached = false;
@@ -655,6 +335,14 @@ public class NodeFactoryImpl extends NodeFactory {
         return contributions;
     }
 
+    protected static String getSystemProperty(final String name) {
+        return AccessController.doPrivileged(new PrivilegedAction<String>() {
+            public String run() {
+                return System.getProperty(name);
+            }
+        });
+    }
+
     protected static class NodeKey {
         private String domainURI;
         private String nodeURI;
diff --git a/java/sca/modules/node-impl/src/main/java/org/apache/tuscany/sca/node/impl/NodeImpl.java b/java/sca/modules/node-impl/src/main/java/org/apache/tuscany/sca/node/impl/NodeImpl.java
index 4de400db11..f3172926f1 100644
--- a/java/sca/modules/node-impl/src/main/java/org/apache/tuscany/sca/node/impl/NodeImpl.java
+++ b/java/sca/modules/node-impl/src/main/java/org/apache/tuscany/sca/node/impl/NodeImpl.java
@@ -114,7 +114,7 @@ public class NodeImpl implements Node, Client {
         manager.init();
         manager.addNode(configuration, this);
         this.proxyFactory = manager.proxyFactory;
-        UtilityExtensionPoint utilities = manager.extensionPoints.getExtensionPoint(UtilityExtensionPoint.class);
+        UtilityExtensionPoint utilities = manager.registry.getExtensionPoint(UtilityExtensionPoint.class);
         
         DomainRegistryFactory domainRegistryFactory = utilities.getUtility(DomainRegistryFactory.class);
         EndpointRegistry endpointRegistry =
@@ -135,7 +135,7 @@ public class NodeImpl implements Node, Client {
                 domainComposite = manager.configureNode(configuration, contributions, context);
 
                 this.compositeContext =
-                    new CompositeContextImpl(manager.extensionPoints, endpointRegistry, domainComposite);
+                    new CompositeContextImpl(manager.registry, endpointRegistry, domainComposite);
             } finally {
                 // Reset the thread context monitor
                 manager.monitorFactory.setContextMonitor(tcm);
@@ -207,7 +207,7 @@ public class NodeImpl implements Node, Client {
             } // end if
 
             manager.removeNode(configuration);
-            manager.extensionPoints.getExtensionPoint(UtilityExtensionPoint.class).removeUtility(compositeActivator);
+            manager.registry.getExtensionPoint(UtilityExtensionPoint.class).removeUtility(compositeActivator);
             this.compositeActivator = null;
             this.proxyFactory = null;
             this.domainComposite = null;
@@ -343,7 +343,7 @@ public class NodeImpl implements Node, Client {
                 .getFactory(XMLOutputFactory.class);
         
         try {
-            compositeProcessor.write(composite, outputFactory.createXMLStreamWriter(bos), new ProcessorContext(manager.extensionPoints));
+            compositeProcessor.write(composite, outputFactory.createXMLStreamWriter(bos), new ProcessorContext(manager.registry));
         } catch(Exception ex) {
             return ex.toString();
         }
diff --git a/java/sca/modules/node-impl/src/main/resources/node-impl-validation-messages.properties b/java/sca/modules/node-impl/src/main/resources/org/apache/tuscany/sca/node/impl/node-impl-validation-messages.properties
index 0c07a3a30f..0c07a3a30f 100644
--- a/java/sca/modules/node-impl/src/main/resources/node-impl-validation-messages.properties
+++ b/java/sca/modules/node-impl/src/main/resources/org/apache/tuscany/sca/node/impl/node-impl-validation-messages.properties