Iso2Servlet.java

/*
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 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
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package com.oracle.hk2.devtest.isolation.web.iso2;

import java.io.IOException;
import java.io.PrintWriter;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.glassfish.hk2.api.ServiceLocator;

/**
 * Simple returns the name of the HABITAT property
 * 
 * @author jwells
 */
public class Iso2Servlet extends HttpServlet {
    /**
     * For serialization
     */
    private static final long serialVersionUID = -9177540431267005946L;
    
    private static final String HABITAT_ATTRIBUTE = "org.glassfish.servlet.habitat";
    private static final String JNDI_APP_LOOKUP = "java:app/hk2/ServiceLocator";
    
    private static final String SERVLET_CONTEXT_LOCATOR = "ServletContextLocator=";
    private static final String JNDI_APP_LOCATOR = "JndiAppLocator=";
    
    private String getJndiAppLocatorName() {
        
        try {
          Context context = new InitialContext();
          
          ServiceLocator retVal = (ServiceLocator) context.lookup(JNDI_APP_LOOKUP);
          
          return retVal.getName();
        }
        catch (NamingException ne) {
            return null;
        }
    }

    /**
     * Just prints out the value of the ServiceLocator getName
     */
    @Override
    public void doGet(HttpServletRequest request,
            HttpServletResponse response)
        throws IOException, ServletException {
        ServletContext context = getServletContext();
        
        ServiceLocator locator = (ServiceLocator) context.getAttribute(HABITAT_ATTRIBUTE);
        
        String reply1 = SERVLET_CONTEXT_LOCATOR + ((locator == null) ? "null" : locator.getName());
        
        String jndiAppLocatorName = getJndiAppLocatorName();
        String reply2 = JNDI_APP_LOCATOR + ((jndiAppLocatorName == null) ? "null" : jndiAppLocatorName);

        response.setContentType("text/html");
        PrintWriter writer = response.getWriter();
        
        writer.println("<html>");
        writer.println("<head>");
        writer.println("<title>Iso2 WebApp</title>");
        writer.println("</head>");
        writer.println("<body>");

        writer.println(reply1);
        writer.println(reply2);

        writer.println("</body>");
        writer.println("</html>");
    }
}