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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 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;
}
}
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