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diff --git a/tags/java/sca/1.5.1-RC1/samples/implementation-crud-extension/src/main/java/crud/provider/CRUDImplementationInvoker.java b/tags/java/sca/1.5.1-RC1/samples/implementation-crud-extension/src/main/java/crud/provider/CRUDImplementationInvoker.java
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+++ b/tags/java/sca/1.5.1-RC1/samples/implementation-crud-extension/src/main/java/crud/provider/CRUDImplementationInvoker.java
@@ -0,0 +1,79 @@
+/*
+ * 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 crud.provider;
+
+import org.apache.tuscany.sca.interfacedef.Operation;
+import org.apache.tuscany.sca.invocation.Invoker;
+import org.apache.tuscany.sca.invocation.Message;
+
+import crud.backend.ResourceManager;
+
+
+/**
+ * Implements an invoker for CRUD component implementations.
+ * 
+ * The invoker is responsible for handling invocations of a business operation.
+ * Input business data is passed to the invoke method in a Message object.
+ * The invoke method is responsible for handling the invocation and returning a Message with
+ * the output business data. 
+ * 
+ * In this example we are simply delegating the CRUD operation invocations to the
+ * corresponding methods on our fake resource manager class.
+ * 
+ * More sophisticated invokers can delegate the invocation to an implementation artifact directly
+ * (for example a Java class using reflection as in the implementation-pojo sample) or call a runtime
+ * engine like a BPEL engine or an XQuery engine for example (this is what the Tuscany
+ * implementation-bpel and implementation-xquery extensions do).
+ */
+class CRUDImplementationInvoker implements Invoker {
+    private Operation operation;
+    private ResourceManager resourceManager;
+    
+    CRUDImplementationInvoker(Operation operation, ResourceManager resourceManager) {
+        this.operation = operation;
+        this.resourceManager = resourceManager;
+    }
+    
+    public Message invoke(Message msg) {
+        try {
+            Object[] args = msg.getBody();
+            Object resp = null;
+            
+            if (operation.getName().equals("create")) {
+                resp = resourceManager.createResource(args[0]);
+                
+            } else if (operation.getName().equals("retrieve")) {
+                resp = resourceManager.retrieveResource((String)args[0]);
+                
+            } else if (operation.getName().equals("update")) {
+                resp = resourceManager.updateResource((String)args[0], args[1]);
+                
+            } else if (operation.getName().equals("delete")) {
+                resourceManager.deleteResource((String)args[0]);
+            }
+            
+            msg.setBody(resp);
+        } catch (Exception e) {
+            msg.setFaultBody(e.getCause());
+        }
+        return msg;
+    }
+
+}