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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 org.apache.tuscany.sca.implementation.das;
import org.apache.tuscany.sca.interfacedef.Operation;
import org.apache.tuscany.sca.invocation.Invoker;
import org.apache.tuscany.sca.invocation.Message;
/**
* Implements a target invoker for DAS component implementations.
*
* The target invoker is responsible for dispatching invocations to the particular
* component implementation logic. The current component implementation will
* dispatch calls to the DAS apis to retrieve the requested data from the backend store
*
*/
public class DASInvoker implements Invoker {
private final Operation operation;
private final DataAccessEngine dataAccessEngine;
public DASInvoker(Operation operation, DataAccessEngine dataAccessEngine) {
this.operation = operation;
this.dataAccessEngine = dataAccessEngine;
}
public Message invoke(Message msg) {
Object[] args = msg.getBody();
Object resp = doTheWork(args);
msg.setBody(resp);
return msg;
}
public Object doTheWork(Object[] args) {
//simple execute command by name
if(args==null || args.length < 1){
return this.dataAccessEngine.executeCommand(operation.getName());
} else {
String xPath = (String) args[0];
return this.dataAccessEngine.executeCommand(operation.getName(), xPath);
}
}
}
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