/*
* 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 node;
import java.io.IOException;
import javax.xml.namespace.QName;
import org.apache.tuscany.sca.domain.SCADomain;
import org.apache.tuscany.sca.node.SCANode;
import org.apache.tuscany.sca.node.SCANodeFactory;
import calculator.CalculatorService;
/**
* This client program shows how to run a distributed SCA node. In this case a
* calculator node has been constructed specifically for running the calculator
* composite. Internally it creates a representation of a node and associates a
* distributed domain with the node. This separation is made different implementations
* of the distributed domain can be provided.
*/
public class CalculatorNode {
public static void main(String[] args) throws Exception {
// Check that the correct arguments have been provided
if (null == args || args.length < 2) {
System.err.println("Useage: java CalculatorNode domainname nodename");
System.exit(1);
}
try {
String domainName = args[0];
String nodeName = args[1];
ClassLoader cl = CalculatorNode.class.getClassLoader();
SCANodeFactory nodeFactory = SCANodeFactory.newInstance();
SCANode node = nodeFactory.createSCANode(nodeName, domainName);
node.addContribution(nodeName, cl.getResource(nodeName + "/"));
node.deployComposite(new QName("http://sample", "Calculator"));
node.start();
// nodeA is the head node and runs some tests while all other nodes
// simply listen for incoming messages
if ( nodeName.equals("nodeA") ) {
// do some application stuff
CalculatorService calculatorService =
node.getDomain().getService(CalculatorService.class, "CalculatorServiceComponentA");
// Calculate
System.out.println("3 + 2=" + calculatorService.add(3, 2));
System.out.println("3 - 2=" + calculatorService.subtract(3, 2));
System.out.println("3 * 2=" + calculatorService.multiply(3, 2));
System.out.println("3 / 2=" + calculatorService.divide(3, 2));
// a little hidden loop test to put some load on the nodes
if (args.length > 2){
for (int i=0; i < 1000; i++){
// Calculate
System.out.println("3 + 2=" + calculatorService.add(3, 2));
System.out.println("3 - 2=" + calculatorService.subtract(3, 2));
System.out.println("3 * 2=" + calculatorService.multiply(3, 2));
System.out.println("3 / 2=" + calculatorService.divide(3, 2));
}
}
} else {
// start up and wait for messages
try {
System.out.println("Node started (press enter to shutdown)");
System.in.read();
} catch (IOException e) {
e.printStackTrace();
}
}
// stop the node and all the domains in it
node.stop();
} catch(Exception ex) {
System.err.println("Exception in node - " + ex.getMessage());
ex.printStackTrace(System.err);
}
}
}