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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.demo.app;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.URI;
import java.net.URISyntaxException;
import javax.servlet.Servlet;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.tuscany.core.component.SimpleWorkContext;
import org.apache.tuscany.core.implementation.PojoWorkContextTunnel;
import org.apache.tuscany.core.implementation.java.JavaComponent;
import org.apache.tuscany.spi.component.ComponentManager;
import org.apache.tuscany.spi.component.InstanceWrapper;
import org.apache.tuscany.spi.component.ScopeContainer;
import org.apache.tuscany.spi.component.TargetResolutionException;
import org.apache.tuscany.spi.host.ServletHost;
import org.osoa.sca.annotations.EagerInit;
import org.osoa.sca.annotations.Reference;
import org.osoa.sca.annotations.Service;
import calculator.CalculatorService;
/**
* @version $Revision$ $Date$
*/
@SuppressWarnings("serial")
@EagerInit
@Service(Servlet.class)
public class CalculatorHandler extends HttpServlet {
// Calculator service
private ComponentManager componentManager;
/**
* Injects the servlet host.
*
* @param servletHost Servlet host to use.
*/
@Reference
public void setServletHost(ServletHost servletHost) {
servletHost.registerMapping("/calculate", this);
}
/**
* Injects the calculator.
*
* @param componentManager Component manager.
*/
@Reference
public void setComponentManager(ComponentManager componentManager) {
this.componentManager = componentManager;
}
/**
* Processes the request.
*
* @param req Servlet request.
* @param res Servlet response.
* @throws ServletException Servlet exception.
* @throws IOException IO Exception.
*/
protected void process(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
try {
PojoWorkContextTunnel.setThreadWorkContext(new SimpleWorkContext());
URI calculatorServiceUri = new URI("tuscany://./domain/CalculatorServiceComponent");
JavaComponent javaComponent = (JavaComponent) componentManager.getComponent(calculatorServiceUri);
ScopeContainer scopeContainer = javaComponent.getScopeContainer();
InstanceWrapper wrapper = scopeContainer.getWrapper(javaComponent, new URI("tuscany://./domain"));
CalculatorService calculatorService = (CalculatorService) wrapper.getInstance();
double op1 = Double.parseDouble(req.getParameter("op1"));
double op2 = Double.parseDouble(req.getParameter("op2"));
double result = calculatorService.add(op1, op2);
PrintWriter writer = res.getWriter();
writer.println("Result: " + result);
writer.flush();
writer.close();
} catch (URISyntaxException ex) {
throw new ServletException(ex);
} catch (TargetResolutionException ex) {
throw new ServletException(ex);
}
}
/**
* Handles get requests.
*/
@Override
protected final void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
process(req, res);
}
/**
* Handles post request.
*/
@Override
protected final void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
process(req, res);
}
}
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