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.android.traininfo.common.DepartureBean;
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.android.traininfo.common.DepartureBean;
20	import dk.thoerup.circuitbreaker.CircuitBreakerException;
21	import dk.thoerup.traininfoservice.Statistics;
22
23	/**
24	* Servlet implementation class DepartureServlet
25	*/
26	@WebServlet(urlPatterns={"/DepartureServlet"})
27	public class DepartureServlet extends HttpServlet {
28	private static final long serialVersionUID = 1L;
29
30	Logger logger = Logger.getLogger( DepartureServlet.class.getName() );
31
32	DepartureFetcher fetcher;
33	TransformerFactory transformerFactory = TransformerFactory.newInstance();
34	DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
35
36
37	@Override
38	public void init() throws ServletException {
39	super.init();
40
41	boolean useAzureSite = Boolean.parseBoolean( getServletContext().getInitParameter("useazuresite") );
42	int cacheTimeout = Integer.parseInt( getServletContext().getInitParameter("cache_timeout") );
43	int replyTimeout = Integer.parseInt( getServletContext().getInitParameter("reply_timeout") );
44	logger.info( "DepartureServlet, use azure site=" + useAzureSite + ", cache=" + cacheTimeout);
45	fetcher = new DepartureFetcher(useAzureSite, cacheTimeout, replyTimeout);
46	}
47
48	@Override
49	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
50	if (req.getParameter("station") == null) {
51	resp.sendError(400, "not enough parameters");
52	return;
53	}
54
55	boolean arrival = false;
56	try {
57	arrival = Integer.parseInt( req.getParameter("arrival")) != 0;
58	} catch (Exception e) {}
59
60	Statistics.getInstance().incrementDepartureLookups();
61
62	int station = Integer.parseInt( req.getParameter("station") );
63	String format = req.getParameter("format");
64
65	DepartureBean beans;
66
67	try {
68	beans = fetcher.cachedLookupDepartures(station, arrival);
69	} catch (java.io.IOException ioe) {
70	logger.warning("Read failed, station="+station + ". " + ioe.getMessage() );
71	Statistics.getInstance().incrementDepartureErrors();
72	resp.sendError(500);
73	return;
74	} catch (CircuitBreakerException cbe) {
75	logger.warning("Circuitbreaker - failing fast");
76	Statistics.getInstance().incrementDepartureErrors();
77	resp.sendError(500);
78	return;
79	} catch (Exception e) {
80	logger.log(Level.WARNING, "Unknown exception, station=" +station, e);
81	Statistics.getInstance().incrementDepartureErrors();
82	resp.sendError(500);
83	return;
84	}
85
86	resp.setDateHeader("Expires", 0);
87	resp.setHeader("Cache-Control", "no-cache, must-revalidate");
88
89	if (format.equalsIgnoreCase("xml")) {
90	resp.setContentType("text/xml");
91	resp.getWriter().print( formatXml(beans, arrival) );
92	} else if (format.equalsIgnoreCase("html")) {
93
94	String advStr = req.getParameter("advanced");
95	boolean advanced = advStr != null ? Boolean.parseBoolean(advStr) : false;
96
97	req.setAttribute("advanced", advanced);
98	req.setAttribute("departurebeans", beans);
99	req.setAttribute("stationID", station );
100	getServletContext().getRequestDispatcher("/ViewDepartures.jsp").forward(req,resp);
101	} else {
102	resp.sendError(400, "Unknown format");
103	}
104
105	}
106
107	protected String formatXml(DepartureBean beans, boolean arrival) throws ServletException{
108
109	Serializer serializer = new Persister();
110
111	ByteArrayOutputStream out = new ByteArrayOutputStream();
112
113	try {
114	serializer.write(beans, out);
115	} catch (Exception e) {
116	throw new ServletException(e);
117	}
118
119	return out.toString();
120	}
121
122	}