1 files changed, 106 insertions, 0 deletions
diff --git a/sca-java-1.x/trunk/samples/implementation-pojo-extension/src/main/java/pojo/provider/POJOImplementationProvider.java b/sca-java-1.x/trunk/samples/implementation-pojo-extension/src/main/java/pojo/provider/POJOImplementationProvider.java
new file mode 100644
index 0000000000..73a0d22493
--- /dev/null
+++ b/sca-java-1.x/trunk/samples/implementation-pojo-extension/src/main/java/pojo/provider/POJOImplementationProvider.java
@@ -0,0 +1,106 @@
+/*
+ * 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 pojo.provider;
+
+import java.lang.reflect.Method;
+
+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;
+import org.osoa.sca.ServiceRuntimeException;
+
+import pojo.POJOImplementation;
+
+/**
+ * An implementation provider for sample CRUD implementations.
+ * 
+ * The implementation provider is responsible for handling the lifecycle of a component
+ * implementation and creating operation invokers for the service operations provided
+ * by the implementation.
+ * 
+ * The start() and stop() methods are called when a component is started
+ * and stopped. In this example we are using that opportunity to call init and destroy methods
+ * on the POJO instance if these methods exist.
+ *
+ * The createInvoker method is called for each operation provided by the component
+ * implementation. The implementation provider can create an invoker and initialize it
+ * at that time to minimize the amount of work to be performed on each invocation.
+ * 
+ * For example here we are looking up the Java method corresponding to the service operation
+ * at passing it to the invoker constructor. This way the invoker won't have to lookup the Java
+ * method on each invocation.  
+ */
+class POJOImplementationProvider implements ImplementationProvider {
+    
+    private POJOImplementation implementation;
+    private Object pojoInstance;
+
+    /**
+     * Constructs a new CRUD implementation.
+     */
+    POJOImplementationProvider(RuntimeComponent component, POJOImplementation implementation) {
+        this.implementation = implementation;
+        
+        // Create a new instance of the POJO
+        try {
+            pojoInstance = implementation.getPOJOClass().newInstance();
+        } catch (Exception e) {
+            throw new ServiceRuntimeException(e);
+        }
+    }
+
+    public void start() {
+        try {
+            // Invoke the POJO's init method
+            Method initMethod = implementation.getMethods().get("init");
+            if (initMethod != null) {
+                initMethod.invoke(pojoInstance);
+            }
+        } catch (Exception e) {
+            throw new ServiceRuntimeException(e);
+        }
+    }
+
+    public void stop() {
+        try {
+            // Invoke the POJO's destroy method
+            Method destroyMethod = implementation.getMethods().get("destroy");
+            if (destroyMethod != null) {
+                destroyMethod.invoke(pojoInstance);
+            }
+        } catch (Exception e) {
+            throw new ServiceRuntimeException(e);
+        } finally {
+            pojoInstance = null;
+        }
+    }
+    
+    public Invoker createInvoker(RuntimeComponentService service, Operation operation) {
+        Method method = implementation.getMethods().get(operation.getName()); 
+        POJOImplementationInvoker invoker = new POJOImplementationInvoker(pojoInstance, operation, method);
+        return invoker;
+    }
+    
+    public boolean supportsOneWayInvocation() {
+        return false;
+    }
+
+}