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Diffstat (limited to 'tags/java/sca/1.5.1-RC3/samples/implementation-pojo-extension/src/main/java/pojo/provider')
3 files changed, 219 insertions, 0 deletions
diff --git a/tags/java/sca/1.5.1-RC3/samples/implementation-pojo-extension/src/main/java/pojo/provider/POJOImplementationInvoker.java b/tags/java/sca/1.5.1-RC3/samples/implementation-pojo-extension/src/main/java/pojo/provider/POJOImplementationInvoker.java new file mode 100644 index 0000000000..87333c61f6 --- /dev/null +++ b/tags/java/sca/1.5.1-RC3/samples/implementation-pojo-extension/src/main/java/pojo/provider/POJOImplementationInvoker.java @@ -0,0 +1,68 @@ +/* + * 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.InvocationTargetException; +import java.lang.reflect.Method; + +import org.apache.tuscany.sca.interfacedef.Operation; +import org.apache.tuscany.sca.invocation.Invoker; +import org.apache.tuscany.sca.invocation.Message; +import org.osoa.sca.ServiceRuntimeException; + +/** + * Implements an invoker for POJO 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 operation invocations to the + * corresponding methods on the POJO implementation class using Java reflection. + * + * Depending on the type of implementation being handled, more sophisticated invokers can + * use other techniques to delegate the invocation to the implementation artifact directly, call a + * runtime engine like a BPEL engine or an XQuery engine (this is what the Tuscany + * implementation-bpel and implementation-xquery extensions do) or just completely handle the + * invocation in the invoker itself if the implementation has a fixed behavior for example. + */ +class POJOImplementationInvoker implements Invoker { + + private Object pojoInstance; + private Method method; + + POJOImplementationInvoker(Object pojoInstance, Operation operation, Method method) { + this.pojoInstance = pojoInstance; + this.method = method; + } + + public Message invoke(Message msg) { + try { + msg.setBody(method.invoke(pojoInstance, (Object[])msg.getBody())); + } catch (InvocationTargetException e) { + msg.setFaultBody(e); + } catch (Exception e) { + throw new ServiceRuntimeException(e); + } + return msg; + } + +} diff --git a/tags/java/sca/1.5.1-RC3/samples/implementation-pojo-extension/src/main/java/pojo/provider/POJOImplementationProvider.java b/tags/java/sca/1.5.1-RC3/samples/implementation-pojo-extension/src/main/java/pojo/provider/POJOImplementationProvider.java new file mode 100644 index 0000000000..73a0d22493 --- /dev/null +++ b/tags/java/sca/1.5.1-RC3/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; + } + +} diff --git a/tags/java/sca/1.5.1-RC3/samples/implementation-pojo-extension/src/main/java/pojo/provider/POJOImplementationProviderFactory.java b/tags/java/sca/1.5.1-RC3/samples/implementation-pojo-extension/src/main/java/pojo/provider/POJOImplementationProviderFactory.java new file mode 100644 index 0000000000..22f2be09e9 --- /dev/null +++ b/tags/java/sca/1.5.1-RC3/samples/implementation-pojo-extension/src/main/java/pojo/provider/POJOImplementationProviderFactory.java @@ -0,0 +1,45 @@ +/* + * 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 org.apache.tuscany.sca.core.ExtensionPointRegistry; +import org.apache.tuscany.sca.provider.ImplementationProvider; +import org.apache.tuscany.sca.provider.ImplementationProviderFactory; +import org.apache.tuscany.sca.runtime.RuntimeComponent; + +import pojo.POJOImplementation; + +/** + * A factory for POJO implementation providers. + */ +public class POJOImplementationProviderFactory implements ImplementationProviderFactory<POJOImplementation> { + + public POJOImplementationProviderFactory(ExtensionPointRegistry registry) { + } + + public Class<POJOImplementation> getModelType() { + // Returns the type of model processed by this processor + return POJOImplementation.class; + } + + public ImplementationProvider createImplementationProvider(RuntimeComponent component, POJOImplementation implementation) { + return new POJOImplementationProvider(component, implementation); + } + +} |