traininfoservice/banedk/DepartureServlet.java

package dk.thoerup.traininfoservice.banedk;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.TransformerFactory;

import org.simpleframework.xml.Serializer;
import org.simpleframework.xml.core.Persister;

import dk.thoerup.circuitbreaker.CircuitBreakerException;
import dk.thoerup.traininfoservice.Statistics;

/**
 * Servlet implementation class DepartureServlet
 */
@WebServlet(urlPatterns={"/DepartureServlet"})
public class DepartureServlet extends HttpServlet {
        private static final long serialVersionUID = 1L;
        
        Logger logger = Logger.getLogger( DepartureServlet.class.getName() );

        DepartureFetcher fetcher;
    TransformerFactory transformerFactory = TransformerFactory.newInstance();
        DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
        

        @Override
        public void init() throws ServletException {
                super.init();

                boolean useAzureSite =  Boolean.parseBoolean( getServletContext().getInitParameter("useazuresite") );
                int cacheTimeout =  Integer.parseInt( getServletContext().getInitParameter("cache_timeout") );
                int replyTimeout =  Integer.parseInt( getServletContext().getInitParameter("reply_timeout") ); 
                logger.info( "DepartureServlet, use azure site=" + useAzureSite + ", cache=" + cacheTimeout);
                fetcher = new DepartureFetcher(useAzureSite, cacheTimeout, replyTimeout);
        }

        @Override
        protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {           
                if (req.getParameter("station") == null) {
                        resp.sendError(400, "not enough parameters");
                        return;
                }
                
                boolean arrival = false;
                try {
                        arrival = Integer.parseInt( req.getParameter("arrival")) != 0;
                } catch (Exception e) {}
                
                Statistics.getInstance().incrementDepartureLookups();
                
                int station = Integer.parseInt( req.getParameter("station") );
                String format = req.getParameter("format");

                DepartureBean beans;            

                try {
                        beans = fetcher.cachedLookupDepartures(station, arrival);
                } catch (java.io.IOException ioe) {
                        logger.warning("Read failed, station="+station + ". " + ioe.getMessage() );
                        Statistics.getInstance().incrementDepartureErrors();
                        resp.sendError(500);
                        return;
                } catch (CircuitBreakerException cbe) {
                        logger.warning("Circuitbreaker - failing fast");
                        Statistics.getInstance().incrementDepartureErrors();
                        resp.sendError(500);
                        return;
                } catch (Exception e) {                 
                        logger.log(Level.WARNING, "Unknown exception, station=" +station, e);
                        Statistics.getInstance().incrementDepartureErrors();
                        resp.sendError(500);
                        return;
                }
                
                resp.setDateHeader("Expires", 0);
                resp.setHeader("Cache-Control", "no-cache, must-revalidate");
                
                if (format.equalsIgnoreCase("xml")) {
                        resp.setContentType("text/xml");
                        resp.getWriter().print( formatXml(beans, arrival) );
                } else if (format.equalsIgnoreCase("html")) {
                        
                        String advStr = req.getParameter("advanced");
                        boolean advanced = advStr != null ? Boolean.parseBoolean(advStr) : false;
                        
                        req.setAttribute("advanced", advanced);
                        req.setAttribute("departurebeans", beans);
                        req.setAttribute("stationID", station );
                        getServletContext().getRequestDispatcher("/ViewDepartures.jsp").forward(req,resp);
                } else {
                        resp.sendError(400, "Unknown format");                  
                }

        }

        protected String formatXml(DepartureBean beans, boolean arrival) throws ServletException{
                
                Serializer serializer = new Persister();

                ByteArrayOutputStream out = new ByteArrayOutputStream();

                try {
                        serializer.write(beans, out);
                } catch (Exception e) {
                        throw new ServletException(e);
                }
                
                return out.toString();
        }

}
1	package dk.thoerup.traininfoservice.banedk;
2
3	import java.io.ByteArrayOutputStream;
4	import java.io.IOException;
5	import java.util.logging.Level;
6	import java.util.logging.Logger;
7
8	import javax.servlet.ServletException;
9	import javax.servlet.annotation.WebServlet;
10	import javax.servlet.http.HttpServlet;
11	import javax.servlet.http.HttpServletRequest;
12	import javax.servlet.http.HttpServletResponse;
13	import javax.xml.parsers.DocumentBuilderFactory;
14	import javax.xml.transform.TransformerFactory;
15
16	import org.simpleframework.xml.Serializer;
17	import org.simpleframework.xml.core.Persister;
18
19	import dk.thoerup.circuitbreaker.CircuitBreakerException;
20	import dk.thoerup.traininfoservice.Statistics;
21
22	/**
23	* Servlet implementation class DepartureServlet
24	*/
25	@WebServlet(urlPatterns={"/DepartureServlet"})
26	public class DepartureServlet extends HttpServlet {
27	private static final long serialVersionUID = 1L;
28
29	Logger logger = Logger.getLogger( DepartureServlet.class.getName() );
30
31	DepartureFetcher fetcher;
32	TransformerFactory transformerFactory = TransformerFactory.newInstance();
33	DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
34
35
36	@Override
37	public void init() throws ServletException {
38	super.init();
39
40	boolean useAzureSite = Boolean.parseBoolean( getServletContext().getInitParameter("useazuresite") );
41	int cacheTimeout = Integer.parseInt( getServletContext().getInitParameter("cache_timeout") );
42	int replyTimeout = Integer.parseInt( getServletContext().getInitParameter("reply_timeout") );
43	logger.info( "DepartureServlet, use azure site=" + useAzureSite + ", cache=" + cacheTimeout);
44	fetcher = new DepartureFetcher(useAzureSite, cacheTimeout, replyTimeout);
45	}
46
47	@Override
48	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
49	if (req.getParameter("station") == null) {
50	resp.sendError(400, "not enough parameters");
51	return;
52	}
53
54	boolean arrival = false;
55	try {
56	arrival = Integer.parseInt( req.getParameter("arrival")) != 0;
57	} catch (Exception e) {}
58
59	Statistics.getInstance().incrementDepartureLookups();
60
61	int station = Integer.parseInt( req.getParameter("station") );
62	String format = req.getParameter("format");
63
64	DepartureBean beans;
65
66	try {
67	beans = fetcher.cachedLookupDepartures(station, arrival);
68	} catch (java.io.IOException ioe) {
69	logger.warning("Read failed, station="+station + ". " + ioe.getMessage() );
70	Statistics.getInstance().incrementDepartureErrors();
71	resp.sendError(500);
72	return;
73	} catch (CircuitBreakerException cbe) {
74	logger.warning("Circuitbreaker - failing fast");
75	Statistics.getInstance().incrementDepartureErrors();
76	resp.sendError(500);
77	return;
78	} catch (Exception e) {
79	logger.log(Level.WARNING, "Unknown exception, station=" +station, e);
80	Statistics.getInstance().incrementDepartureErrors();
81	resp.sendError(500);
82	return;
83	}
84
85	resp.setDateHeader("Expires", 0);
86	resp.setHeader("Cache-Control", "no-cache, must-revalidate");
87
88	if (format.equalsIgnoreCase("xml")) {
89	resp.setContentType("text/xml");
90	resp.getWriter().print( formatXml(beans, arrival) );
91	} else if (format.equalsIgnoreCase("html")) {
92
93	String advStr = req.getParameter("advanced");
94	boolean advanced = advStr != null ? Boolean.parseBoolean(advStr) : false;
95
96	req.setAttribute("advanced", advanced);
97	req.setAttribute("departurebeans", beans);
98	req.setAttribute("stationID", station );
99	getServletContext().getRequestDispatcher("/ViewDepartures.jsp").forward(req,resp);
100	} else {
101	resp.sendError(400, "Unknown format");
102	}
103
104	}
105
106	protected String formatXml(DepartureBean beans, boolean arrival) throws ServletException{
107
108	Serializer serializer = new Persister();
109
110	ByteArrayOutputStream out = new ByteArrayOutputStream();
111
112	try {
113	serializer.write(beans, out);
114	} catch (Exception e) {
115	throw new ServletException(e);
116	}
117
118	return out.toString();
119	}
120
121	}