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/*
* 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 java.lang.reflect.InvocationTargetException;
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 a target invoker for CRUD component implementations.
*
* The target invoker is responsible for dispatching invocations to the particular
* component implementation logic. In this example we are simply delegating the
* CRUD operation invocations to the corresponding methods on our fake
* resource manager.
*
* @version $Rev$ $Date$
*/
public class CRUDInvoker implements Invoker {
private Operation operation;
private ResourceManager resourceManager;
public CRUDInvoker(Operation operation, ResourceManager resourceManager) {
this.operation = operation;
this.resourceManager = resourceManager;
}
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 {
if (operation.getName().equals("create")) {
return resourceManager.createResource(args[0]);
} else if (operation.getName().equals("retrieve")) {
return resourceManager.retrieveResource((String)args[0]);
} else if (operation.getName().equals("update")) {
return resourceManager.updateResource((String)args[0], args[1]);
} else if (operation.getName().equals("delete")) {
resourceManager.deleteResource((String)args[0]);
return null;
} else {
return null;
}
}
}
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