Copy modules for event prototype

git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@705212 13f79535-47bb-0310-9956-ffa450edef68

13 files changed, 887 insertions, 0 deletions

diff --git a/sandbox/event/modules/implementation-das/src/main/java/org/apache/tuscany/sca/implementation/das/Constants.java b/sandbox/event/modules/implementation-das/src/main/java/org/apache/tuscany/sca/implementation/das/Constants.java
new file mode 100644
index 0000000000..b0b4b132e6
--- /dev/null
+++ b/sandbox/event/modules/implementation-das/src/main/java/org/apache/tuscany/sca/implementation/das/Constants.java
@@ -0,0 +1,33 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.implementation.das;
+
+/**
+ * Generic constants used in this implementation
+ * 
+ * @version $Rev$ $Date$
+ */
+public interface Constants {
+    /** 
+     * Identify Relation Database data store
+     */
+    String DATA_ACCESS_TYPE_RDB = "rdb";
+
+}
diff --git a/sandbox/event/modules/implementation-das/src/main/java/org/apache/tuscany/sca/implementation/das/DAS.java b/sandbox/event/modules/implementation-das/src/main/java/org/apache/tuscany/sca/implementation/das/DAS.java
new file mode 100644
index 0000000000..1fc46ea710
--- /dev/null
+++ b/sandbox/event/modules/implementation-das/src/main/java/org/apache/tuscany/sca/implementation/das/DAS.java
@@ -0,0 +1,49 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.implementation.das;
+
+import commonj.sdo.DataObject;
+
+
+/**
+ * The service interface of a DAS service provided by DAS components.
+ * 
+ * @version $Rev$ $Date$
+ */
+public interface DAS {
+
+    /**
+     * Execute a DAS Command specified on the DAS config file.
+     * @param commandName The name of the command
+     * @return
+     */
+    DataObject executeCommand(String commandName);
+    
+    /**Execute a DAS Command specified on the DAS config file, 
+     * and narrow the results based on the provided XPath
+     * 
+     * @param commandName The name of the command
+     * @param xPath The xPath filter
+     * @return
+     */
+    DataObject executeCommand(String commandName, String xPath);
+    
+    
+
+}
diff --git a/sandbox/event/modules/implementation-das/src/main/java/org/apache/tuscany/sca/implementation/das/DASImplementation.java b/sandbox/event/modules/implementation-das/src/main/java/org/apache/tuscany/sca/implementation/das/DASImplementation.java
new file mode 100644
index 0000000000..0e0c689b41
--- /dev/null
+++ b/sandbox/event/modules/implementation-das/src/main/java/org/apache/tuscany/sca/implementation/das/DASImplementation.java
@@ -0,0 +1,146 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.implementation.das;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+import org.apache.tuscany.sca.assembly.AssemblyFactory;
+import org.apache.tuscany.sca.assembly.ConstrainingType;
+import org.apache.tuscany.sca.assembly.Implementation;
+import org.apache.tuscany.sca.assembly.Property;
+import org.apache.tuscany.sca.assembly.Reference;
+import org.apache.tuscany.sca.assembly.Service;
+import org.apache.tuscany.sca.data.engine.config.ConnectionInfo;
+import org.apache.tuscany.sca.interfacedef.InvalidInterfaceException;
+import org.apache.tuscany.sca.interfacedef.java.JavaInterface;
+import org.apache.tuscany.sca.interfacedef.java.JavaInterfaceContract;
+import org.apache.tuscany.sca.interfacedef.java.JavaInterfaceFactory;
+
+
+/**
+ * The model representing a sample DAS implementation in an SCA assembly model.
+ * 
+ * @version $Rev$ $Date$
+ */
+public class DASImplementation implements Implementation {
+
+    private String dasConfig;
+    private String dataAccessType;
+    
+    private ConnectionInfo connectionInfo;
+    
+    private boolean unresolved;
+    private List<Service> services = new ArrayList<Service>();
+
+    /**
+     * Constructs a new DAS implementation.
+     */
+    public DASImplementation(AssemblyFactory assemblyFactory,
+                              JavaInterfaceFactory javaFactory) {
+
+        // DAS implementation always provide a single service exposing
+        // the DAS interface, and have no references and properties
+        Service dasService = null;
+        dasService = assemblyFactory.createService();
+        dasService.setName("DAS");
+        JavaInterface javaInterface;
+        try {
+            javaInterface = javaFactory.createJavaInterface(DAS.class);
+        } catch (InvalidInterfaceException e) {
+            throw new IllegalArgumentException(e);
+        }
+        JavaInterfaceContract interfaceContract = javaFactory.createJavaInterfaceContract();
+        interfaceContract.setInterface(javaInterface);
+        dasService.setInterfaceContract(interfaceContract);
+        
+        services.add(dasService);
+    }
+
+    /* DAS Model Information */
+    
+    public String getConfig() {
+        return this.dasConfig;
+    }
+
+    public void setConfig(String config) {
+        this.dasConfig = config;
+    }
+    
+    public String getDataAccessType() {
+        return this.dataAccessType;
+    }
+    
+    public void setDataAccessType (String dataAccessType) {
+        this.dataAccessType = dataAccessType;
+    }
+    
+    public ConnectionInfo getConnectionInfo() {
+        return this.connectionInfo;
+    }
+
+    public void setConnectionInfo(ConnectionInfo connectionInfo) {
+        this.connectionInfo = connectionInfo;
+    }
+
+    /* SCA Model Information */
+
+	public ConstrainingType getConstrainingType() {
+		// DAS implementation does not support constrainingTypes
+		return null;
+	}
+
+	public List<Property> getProperties() {
+		// DAS implementation does not support properties
+        return Collections.emptyList();
+	}
+
+	public List<Reference> getReferences() {
+		// DAS implementation does not support references
+        return Collections.emptyList();
+	}
+
+	public List<Service> getServices() {
+        return services;
+	}
+
+	public String getURI() {
+		// DAS implementation does not have a URI
+        return null;
+	}
+	
+	public boolean isUnresolved() {
+        return unresolved;
+    }
+
+	public void setConstrainingType(ConstrainingType constrainingType) {
+		// DAS implementation does not support constrainingTypes
+	}
+
+	public void setURI(String uri) {
+		// DAS implementation does not have a URI
+		
+	}
+
+	public void setUnresolved(boolean undefined) {
+        this.unresolved = undefined;
+    }
+    
+}
diff --git a/sandbox/event/modules/implementation-das/src/main/java/org/apache/tuscany/sca/implementation/das/DASImplementationFactory.java b/sandbox/event/modules/implementation-das/src/main/java/org/apache/tuscany/sca/implementation/das/DASImplementationFactory.java
new file mode 100644
index 0000000000..93d22d2d5a
--- /dev/null
+++ b/sandbox/event/modules/implementation-das/src/main/java/org/apache/tuscany/sca/implementation/das/DASImplementationFactory.java
@@ -0,0 +1,36 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.implementation.das;
+
+/**
+ * A factory for the sample DAS implementation model.
+ * 
+ * @version $Rev$ $Date$
+ */
+public interface DASImplementationFactory {
+    
+    /**
+     * Creates a new CRUD implementation.
+     * 
+     * @return
+     */
+    DASImplementation createDASImplementation();
+
+}
diff --git a/sandbox/event/modules/implementation-das/src/main/java/org/apache/tuscany/sca/implementation/das/DASImplementationProcessor.java b/sandbox/event/modules/implementation-das/src/main/java/org/apache/tuscany/sca/implementation/das/DASImplementationProcessor.java
new file mode 100644
index 0000000000..0e90c90082
--- /dev/null
+++ b/sandbox/event/modules/implementation-das/src/main/java/org/apache/tuscany/sca/implementation/das/DASImplementationProcessor.java
@@ -0,0 +1,271 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.implementation.das;
+
+import static javax.xml.stream.XMLStreamConstants.START_ELEMENT;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import javax.xml.namespace.QName;
+import javax.xml.stream.XMLStreamConstants;
+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.ComponentType;
+import org.apache.tuscany.sca.assembly.Property;
+import org.apache.tuscany.sca.assembly.Service;
+import org.apache.tuscany.sca.assembly.builder.impl.ProblemImpl;
+import org.apache.tuscany.sca.assembly.xml.Constants;
+import org.apache.tuscany.sca.contribution.ModelFactoryExtensionPoint;
+import org.apache.tuscany.sca.contribution.processor.StAXArtifactProcessor;
+import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
+import org.apache.tuscany.sca.contribution.service.ContributionReadException;
+import org.apache.tuscany.sca.contribution.service.ContributionResolveException;
+import org.apache.tuscany.sca.contribution.service.ContributionWriteException;
+import org.apache.tuscany.sca.data.engine.ConnectionInfoArtifactProcessor;
+import org.apache.tuscany.sca.data.engine.config.ConnectionInfo;
+import org.apache.tuscany.sca.interfacedef.java.JavaInterfaceFactory;
+import org.apache.tuscany.sca.monitor.Monitor;
+import org.apache.tuscany.sca.monitor.Problem;
+import org.apache.tuscany.sca.monitor.Problem.Severity;
+
+
+/**
+ * Implements a StAX artifact processor for DAS implementations.
+ * 
+ * The artifact processor is responsible for processing <implementation.das>
+ * elements in SCA assembly XML composite files and populating the DAS
+ * implementation model, resolving its references to other artifacts in the SCA
+ * contribution, and optionally write the model back to SCA assembly XML.
+ * 
+ * @version $Rev$ $Date$
+ */
+public class DASImplementationProcessor implements StAXArtifactProcessor<DASImplementation> {
+    private static final QName IMPLEMENTATION_DAS = new QName(Constants.SCA10_TUSCANY_NS, "implementation.das");
+    
+    private DASImplementationFactory dasFactory;
+    
+    private final AssemblyFactory assemblyFactory;
+    private final JavaInterfaceFactory javaFactory;
+    private Monitor monitor;
+    private StAXArtifactProcessor<ConnectionInfo> connectionInfoProcessor;
+    
+    public DASImplementationProcessor(ModelFactoryExtensionPoint modelFactories, Monitor monitor) {
+        assemblyFactory = modelFactories.getFactory(AssemblyFactory.class);
+        javaFactory = modelFactories.getFactory(JavaInterfaceFactory.class);
+        this.monitor = monitor;
+        this.dasFactory = new DefaultDASImplementationFactory(assemblyFactory, javaFactory);        
+        this.connectionInfoProcessor = new ConnectionInfoArtifactProcessor(modelFactories, this.monitor);
+    }
+
+    public QName getArtifactType() {
+        // Returns the QName of the XML element processed by this processor
+        return IMPLEMENTATION_DAS;
+    }
+
+    public Class<DASImplementation> getModelType() {
+        // Returns the type of model processed by this processor
+        return DASImplementation.class;
+    }
+    
+    /**
+     * Report a error.
+     *
+     * @param problems
+     * @param message
+     * @param model
+     */
+    private void error(String message, Object model, Object... messageParameters) {
+        if (monitor != null) {
+            Problem problem = new ProblemImpl(this.getClass().getName(), "impl-das-validation-messages", Severity.ERROR, model, message, (Object[])messageParameters);
+            monitor.problem(problem);
+        }
+    }
+
+    /*
+     * <component name="CompanyDataComponent">
+     *   <implementation.das config="/CompanyConfig.xml" dataAccessType="rdb">
+     *      <connectionInfo>
+     *         <connectionProperties 
+     *          driverClass="org.apache.derby.jdbc.EmbeddedDriver" 
+     *          databaseURL="jdbc:derby:target/test-classes/dastest; create = true" 
+     *          loginTimeout="600000"/>
+     *      </connectionInfo>
+     *   </implementation.data>
+     * </component>
+     */
+    public DASImplementation read(XMLStreamReader reader) throws ContributionReadException, XMLStreamException {
+        assert IMPLEMENTATION_DAS.equals(reader.getName());
+
+        // Read an <implementation.das> element
+        
+        // Create an initialize the DAS implementation model
+        DASImplementation implementation = null;
+
+        // Read the das config file attribute.
+        // This is das configuration side file to use
+        String config = reader.getAttributeValue(null, "config");        
+
+        // Read the data access type attribute
+        // This is the type of data store in use (e.g RDB, XML, etc)
+        String dataAccessType = reader.getAttributeValue(null, "dataAccessType");        
+        
+        // Both config and dataAccessType are required attributes, hence validating.
+        if (config == null || dataAccessType == null) {
+            if (config == null) 
+                error("ConfigAttributeMissing", reader);
+            if (dataAccessType == null) 
+                error("DataAccessTypeAttributeMissing", reader);
+            return implementation;
+        }
+
+        // Create an initialize the DAS implementation model
+        implementation = dasFactory.createDASImplementation();
+        implementation.setConfig(config);
+        implementation.setDataAccessType(dataAccessType);
+        implementation.setUnresolved(true);
+
+        while (true) {
+            int event = reader.next();
+            switch (event) {
+
+            case START_ELEMENT:
+                if (ConnectionInfoArtifactProcessor.CONNECTION_INFO.equals(reader.getName())) {
+
+                    // Read connection info
+                    ConnectionInfo connectionInfo = (ConnectionInfo) connectionInfoProcessor.read(reader);
+                    implementation.setConnectionInfo(connectionInfo);
+                }
+                break;
+            case XMLStreamConstants.END_ELEMENT:
+                if (IMPLEMENTATION_DAS.equals(reader.getName())) {
+                    return implementation;
+                }
+                break;
+            }
+        }
+    }
+
+    public void resolve(DASImplementation impl, ModelResolver resolver) throws ContributionResolveException {
+        if( impl != null && impl.isUnresolved()) {
+            //resolve component type
+            mergeComponentType(resolver, impl);
+                        
+            //set current implementation resolved 
+            impl.setUnresolved(false);
+        }
+    }
+
+    public void write(DASImplementation implementation, XMLStreamWriter writer) throws ContributionWriteException, XMLStreamException {
+        
+        writer.writeStartElement(IMPLEMENTATION_DAS.getNamespaceURI(), IMPLEMENTATION_DAS.getLocalPart());
+        
+        if (implementation.getConfig() != null) {
+            writer.writeAttribute("config", implementation.getConfig());
+        }
+        if (implementation.getDataAccessType() != null) {
+            writer.writeAttribute("dataAccessType", implementation.getDataAccessType());
+        }
+        
+        if (implementation.getConnectionInfo() != null) { 
+            connectionInfoProcessor.write(implementation.getConnectionInfo(), writer);
+        }
+        
+        writer.writeEndElement();
+    }
+    
+    /**
+     * Merge the componentType from introspection and external file
+     * @param resolver
+     * @param impl
+     */
+    private void mergeComponentType(ModelResolver resolver, DASImplementation impl) {
+        // FIXME: Need to clarify how to merge
+        ComponentType componentType = getComponentType(resolver, impl);
+        if (componentType != null && !componentType.isUnresolved()) {
+            /*
+            Map<String, Reference> refMap = new HashMap<String, Reference>();
+            for (Reference ref : impl.getReferences()) {
+                refMap.put(ref.getName(), ref);
+            }
+            for (Reference reference : componentType.getReferences()) {
+                refMap.put(reference.getName(), reference);
+            }
+            impl.getReferences().clear();
+            impl.getReferences().addAll(refMap.values());
+
+            // Try to match references by type
+            Map<String, JavaElementImpl> refMembers = impl.getReferenceMembers();
+            for (Reference ref : impl.getReferences()) {
+                if (ref.getInterfaceContract() != null) {
+                    Interface i = ref.getInterfaceContract().getInterface();
+                    if (i instanceof JavaInterface) {
+                        Class<?> type = ((JavaInterface)i).getJavaClass();
+                        if (!refMembers.containsKey(ref.getName())) {
+                            JavaElementImpl e = getMemeber(impl, ref.getName(), type);
+                            if (e != null) {
+                                refMembers.put(ref.getName(), e);
+                            }
+                        }
+                    }
+                }
+            }*/
+
+            Map<String, Service> serviceMap = new HashMap<String, Service>();
+            for (Service svc : impl.getServices()) {
+                if(svc != null) {
+                    serviceMap.put(svc.getName(), svc);    
+                }
+            }
+            for (Service service : componentType.getServices()) {                
+                serviceMap.put(service.getName(), service);
+            }
+            impl.getServices().clear();
+            impl.getServices().addAll(serviceMap.values());
+
+            Map<String, Property> propMap = new HashMap<String, Property>();
+            for (Property prop : impl.getProperties()) {
+                propMap.put(prop.getName(), prop);
+            }
+        }
+    }
+
+    private String getFileName(String filePath) {
+        int pos = filePath.lastIndexOf(".");
+        
+        return filePath.substring(0, pos);
+        
+    }
+    
+    private ComponentType getComponentType(ModelResolver resolver, DASImplementation impl) {
+        String dasConfig = this.getFileName(impl.getConfig());
+        String componentTypeURI = dasConfig.replace('.', '/') + ".componentType";
+        ComponentType componentType = assemblyFactory.createComponentType();
+        componentType.setUnresolved(true);
+        componentType.setURI(componentTypeURI);
+        componentType = resolver.resolveModel(ComponentType.class, componentType);
+        if (!componentType.isUnresolved()) {
+            return componentType;
+        }
+        return null;
+    }
+}
diff --git a/sandbox/event/modules/implementation-das/src/main/java/org/apache/tuscany/sca/implementation/das/DefaultDASImplementationFactory.java b/sandbox/event/modules/implementation-das/src/main/java/org/apache/tuscany/sca/implementation/das/DefaultDASImplementationFactory.java
new file mode 100644
index 0000000000..2e18541b3b
--- /dev/null
+++ b/sandbox/event/modules/implementation-das/src/main/java/org/apache/tuscany/sca/implementation/das/DefaultDASImplementationFactory.java
@@ -0,0 +1,46 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.implementation.das;
+
+import org.apache.tuscany.sca.assembly.AssemblyFactory;
+import org.apache.tuscany.sca.interfacedef.java.JavaInterfaceFactory;
+
+
+/**
+ * A default factory for the DAS implementation model.
+ * 
+ * @version $Rev$ $Date$
+ */
+public class DefaultDASImplementationFactory implements DASImplementationFactory {
+    
+    private AssemblyFactory assemblyFactory;
+    private JavaInterfaceFactory javaFactory;
+    
+    public DefaultDASImplementationFactory(AssemblyFactory assemblyFactory,
+                                            JavaInterfaceFactory javaFactory) {
+        this.assemblyFactory = assemblyFactory;
+        this.javaFactory = javaFactory;
+    }
+
+    public DASImplementation createDASImplementation() {
+        return new DASImplementation(assemblyFactory, javaFactory);
+    }
+
+}
diff --git a/sandbox/event/modules/implementation-das/src/main/java/org/apache/tuscany/sca/implementation/das/annotations/Command.java b/sandbox/event/modules/implementation-das/src/main/java/org/apache/tuscany/sca/implementation/das/annotations/Command.java
new file mode 100644
index 0000000000..c8c3fd75e6
--- /dev/null
+++ b/sandbox/event/modules/implementation-das/src/main/java/org/apache/tuscany/sca/implementation/das/annotations/Command.java
@@ -0,0 +1,36 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.implementation.das.annotations;
+
+/**
+ *
+ * @version $Rev$ $Date$
+ */
+public @interface Command {
+    enum TYPE {SELECT, INSERT, DELETE, UPDATE}
+    
+    /**
+     * Defines an Ad hoc command query
+     * @return
+     */
+    String query() default ""; 
+    
+    TYPE type() default TYPE.SELECT;
+}
diff --git a/sandbox/event/modules/implementation-das/src/main/java/org/apache/tuscany/sca/implementation/das/provider/DASImplementationProvider.java b/sandbox/event/modules/implementation-das/src/main/java/org/apache/tuscany/sca/implementation/das/provider/DASImplementationProvider.java
new file mode 100644
index 0000000000..40f414b7ef
--- /dev/null
+++ b/sandbox/event/modules/implementation-das/src/main/java/org/apache/tuscany/sca/implementation/das/provider/DASImplementationProvider.java
@@ -0,0 +1,75 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.implementation.das.provider;
+
+import org.apache.tuscany.das.rdb.DAS;
+import org.apache.tuscany.sca.data.engine.DataAccessEngine;
+import org.apache.tuscany.sca.data.engine.DataAccessEngineManager;
+import org.apache.tuscany.sca.implementation.das.DASImplementation;
+import org.apache.tuscany.sca.interfacedef.Operation;
+import org.apache.tuscany.sca.invocation.Invoker;
+import org.apache.tuscany.sca.provider.ImplementationProvider;
+import org.apache.tuscany.sca.runtime.RuntimeComponent;
+import org.apache.tuscany.sca.runtime.RuntimeComponentService;
+
+/**
+ * DAS Implementation provider
+ * 
+ * @version $Rev$ $Date$
+ */
+public class DASImplementationProvider implements ImplementationProvider {
+    
+    private RuntimeComponent component;
+    private DASImplementation implementation;
+    private final DataAccessEngineManager dataAccessEngineManager;
+
+    /**
+     * Constructs a new DAS implementation.
+     */
+    public DASImplementationProvider(RuntimeComponent component, DASImplementation implementation) {
+        this.component = component;
+        this.implementation = implementation;
+        this.dataAccessEngineManager = new DataAccessEngineManager();
+    }
+
+    public Invoker createInvoker(RuntimeComponentService service, Operation operation) {
+        DAS das = null;
+        try {
+            das = dataAccessEngineManager.getDAS(implementation.getConfig(), implementation.getConnectionInfo());
+        } catch(Exception e) {
+            e.printStackTrace();
+            //what now ?
+        }
+        DASInvoker invoker = new DASInvoker(operation, new DataAccessEngine(das) );
+        return invoker;
+    }
+
+    public boolean supportsOneWayInvocation() {
+        return false;
+    }
+
+    public void start() {
+        System.out.println("Starting " + component.getName());
+    }
+
+    public void stop() {
+        System.out.println("Stopping " + component.getName());
+    }
+
+}
diff --git a/sandbox/event/modules/implementation-das/src/main/java/org/apache/tuscany/sca/implementation/das/provider/DASImplementationProviderFactory.java b/sandbox/event/modules/implementation-das/src/main/java/org/apache/tuscany/sca/implementation/das/provider/DASImplementationProviderFactory.java
new file mode 100644
index 0000000000..3ce182347c
--- /dev/null
+++ b/sandbox/event/modules/implementation-das/src/main/java/org/apache/tuscany/sca/implementation/das/provider/DASImplementationProviderFactory.java
@@ -0,0 +1,47 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.implementation.das.provider;
+
+import org.apache.tuscany.sca.core.ExtensionPointRegistry;
+import org.apache.tuscany.sca.implementation.das.DASImplementation;
+import org.apache.tuscany.sca.provider.ImplementationProvider;
+import org.apache.tuscany.sca.provider.ImplementationProviderFactory;
+import org.apache.tuscany.sca.runtime.RuntimeComponent;
+
+/**
+ * Factory for DAS Implementation Provider
+ * 
+ * @version $Rev$ $Date$
+ */
+public class DASImplementationProviderFactory implements ImplementationProviderFactory<DASImplementation> {
+
+    /**
+     * Constructs a new DAS implementation.
+     */
+    public DASImplementationProviderFactory(ExtensionPointRegistry extensionPoints) {
+    }
+
+    public ImplementationProvider createImplementationProvider(RuntimeComponent component, DASImplementation implementation) {
+        return new DASImplementationProvider(component, implementation);
+    }
+    
+    public Class<DASImplementation> getModelType() {
+        return DASImplementation.class;
+    }
+}
diff --git a/sandbox/event/modules/implementation-das/src/main/java/org/apache/tuscany/sca/implementation/das/provider/DASInvoker.java b/sandbox/event/modules/implementation-das/src/main/java/org/apache/tuscany/sca/implementation/das/provider/DASInvoker.java
new file mode 100644
index 0000000000..4cd227717c
--- /dev/null
+++ b/sandbox/event/modules/implementation-das/src/main/java/org/apache/tuscany/sca/implementation/das/provider/DASInvoker.java
@@ -0,0 +1,87 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.implementation.das.provider;
+
+import java.lang.reflect.InvocationTargetException;
+
+import org.apache.tuscany.sca.data.engine.DataAccessEngine;
+import org.apache.tuscany.sca.interfacedef.Operation;
+import org.apache.tuscany.sca.invocation.Invoker;
+import org.apache.tuscany.sca.invocation.Message;
+
+
+/**
+ * Implements a target invoker for DAS component implementations.
+ * 
+ * The target invoker is responsible for dispatching invocations to the particular
+ * component implementation logic. The current component implementation will
+ * dispatch calls to the DAS APIs to retrieve the requested data from the back-end store
+ * 
+ * @version $Rev$ $Date$
+ */
+public class DASInvoker implements Invoker {
+    private final Operation operation;
+    private final DataAccessEngine dataAccessEngine;
+    
+    public DASInvoker(Operation operation, DataAccessEngine dataAccessEngine) {
+        this.operation = operation;
+        this.dataAccessEngine = dataAccessEngine;
+    }
+    
+    public Message invoke(Message msg) {
+        try {
+            Object[] args = msg.getBody();
+            Object resp = doTheWork(args);
+            msg.setBody(resp);
+        } catch (InvocationTargetException e) {
+            msg.setFaultBody(e.getCause());
+        }
+        return msg;
+    }
+
+    public Object doTheWork(Object[] args) throws InvocationTargetException {
+        //check annotation
+//        try {
+//            Method methodDeclaration = this.getClass().getMethod(operation.getName(), null);
+//            methodDeclaration.getAnnotation(org.apache.tuscany.sca.implementation.das.annotations.Command.class);
+//        } catch (Exception e) {
+//            //ignore
+//        }
+        
+        //check if static way
+        if (operation.getName().equals("executeCommand")) {
+            String commandName, xPath;
+            
+            //simple execute command by name
+            if( args.length == 1){
+                commandName = (String) args[0];
+                return this.dataAccessEngine.executeCommand(commandName);
+            } else {
+                commandName = (String) args[0];
+                xPath = (String) args[1];
+                
+                return this.dataAccessEngine.executeCommand(commandName, xPath);
+            }
+        } else { // dynamic mapping to command
+            
+            return this.dataAccessEngine.executeCommand(operation.getName());
+        }
+    }
+}
diff --git a/sandbox/event/modules/implementation-das/src/main/resources/META-INF/services/org.apache.tuscany.sca.contribution.processor.StAXArtifactProcessor b/sandbox/event/modules/implementation-das/src/main/resources/META-INF/services/org.apache.tuscany.sca.contribution.processor.StAXArtifactProcessor
new file mode 100644
index 0000000000..417195c684
--- /dev/null
+++ b/sandbox/event/modules/implementation-das/src/main/resources/META-INF/services/org.apache.tuscany.sca.contribution.processor.StAXArtifactProcessor
@@ -0,0 +1,19 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+# 
+#   http://www.apache.org/licenses/LICENSE-2.0
+# 
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License. 
+
+# Implementation class for the artifact processor extension
+org.apache.tuscany.sca.implementation.das.DASImplementationProcessor;qname=http://tuscany.apache.org/xmlns/sca/1.0#implementation.das,model=org.apache.tuscany.sca.implementation.das.DASImplementation
diff --git a/sandbox/event/modules/implementation-das/src/main/resources/META-INF/services/org.apache.tuscany.sca.provider.ImplementationProviderFactory b/sandbox/event/modules/implementation-das/src/main/resources/META-INF/services/org.apache.tuscany.sca.provider.ImplementationProviderFactory
new file mode 100644
index 0000000000..290f05d03e
--- /dev/null
+++ b/sandbox/event/modules/implementation-das/src/main/resources/META-INF/services/org.apache.tuscany.sca.provider.ImplementationProviderFactory
@@ -0,0 +1,19 @@
+# Licensed to the Apache Software Foundation (ASF) under one

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

+# distributed with this work for additional information

+# regarding copyright ownership.  The ASF licenses this file

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

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

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

+# 

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

+# 

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

+# software distributed under the License is distributed on an

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

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

+# specific language governing permissions and limitations

+# under the License. 

+

+# Implementation class for the implementation extension

+org.apache.tuscany.sca.implementation.das.provider.DASImplementationProviderFactory;model=org.apache.tuscany.sca.implementation.das.DASImplementation

diff --git a/sandbox/event/modules/implementation-das/src/main/resources/impl-das-validation-messages.properties b/sandbox/event/modules/implementation-das/src/main/resources/impl-das-validation-messages.properties
new file mode 100644
index 0000000000..a002d3cef0
--- /dev/null
+++ b/sandbox/event/modules/implementation-das/src/main/resources/impl-das-validation-messages.properties
@@ -0,0 +1,23 @@
+#
+#
+#    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.
+#
+#
+ConfigAttributeMissing = Attribute 'config' is missing.
+DataAccessTypeAttributeMissing = Attribute 'dataAccessType' is missing.
+