traininfoservice/banedk/DepartureServlet.java

package dk.thoerup.traininfoservice.banedk;

import java.io.IOException;
import java.io.StringWriter;
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.transform.Templates;
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;
import dk.thoerup.traininfoservice.TraininfoSettings;
import dk.thoerup.traininfoservice.banedk.DepartureFetcher.FetchTrainType;
import dk.thoerup.traininfoservice.db.StationDAO;

/**
 * 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 xslTransFact;
        Templates xslTemplate;
        

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


                TraininfoSettings settings = (TraininfoSettings) getServletContext().getAttribute("settings");
                fetcher = new DepartureFetcher(settings);
                
                /*
                xslTransFact = TransformerFactory.newInstance();
                
                String xslPath = getServletContext().getRealPath("/departures.xsl");
                Source stylesheet = new StreamSource( new File(xslPath) );
                
                try {
                        xslTemplate = xslTransFact.newTemplates(stylesheet);
                } catch (Exception e) {
                        throw new ServletException(e);
                }*/
        }

        @Override
        protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {           
                if (req.getParameter("station") == null || req.getParameter("station").equals("") ) {
                        resp.sendError(400, "not enough parameters (station)");
                        return;
                }
                if (req.getParameter("format") == null || req.getParameter("format").equals("")) {
                        resp.sendError(400, "not enough parameters (format)");
                        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;
                
                DepartureFetcher.FetchTrainType type = FetchTrainType.BOTH;
                if ( req.getParameter("type") != null) {
                        type = FetchTrainType.valueOf( req.getParameter("type") );
                }

                
                try {
                        beans = fetcher.cachedLookupDepartures(station, arrival, type);
                        beans.arrival = arrival;
                } catch (java.io.IOException ioe) {
                        logger.warning("Read failed, station="+station + ". " + ioe.getMessage() );
                        Statistics.getInstance().incrementDepartureErrors();
                        resp.sendError(500, "backend didnt answer");
                        return;
                } catch (CircuitBreakerException cbe) {
                        logger.warning("Circuitbreaker - failing fast, station=" +station);
                        Statistics.getInstance().incrementDepartureErrors();
                        beans = generateErrorBean(1);
                } catch (StationDAO.NostationException nse) {
                        logger.log(Level.WARNING, "Station not in Database, station=" +station);
                        Statistics.getInstance().incrementDepartureErrors();
                        resp.sendError(400, "invalid station ID");
                        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) );
                } 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);
                        /*resp.setContentType("text/html");
                        resp.getWriter().print(  xmlToHtml(formatXml(beans))  );*/
                } else {
                        resp.sendError(400, "Unknown format");                  
                }
        }
        
        protected DepartureBean generateErrorBean(int code) {
                DepartureBean bean = new DepartureBean();
                bean.stationName="";
                bean.errorCode = code;
                return bean;
        }

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

                StringWriter out = new StringWriter();

                try {
                        serializer.write(beans, out);
                } catch (Exception e) {
                        throw new ServletException(e);
                }
                
                return out.toString();
        }
        /*
        protected String xmlToHtml(String input) throws ServletException {

                try {                                   
                        Transformer trans = xslTemplate.newTransformer();
                        
                
                        Source xml = new StreamSource( new StringReader(input));
                        StringWriter out = new StringWriter();
                        trans.transform(xml, new StreamResult(out));            
                
                        return out.toString();
                } catch (Exception e) {
                        throw new ServletException(e);
                }
        }*/

}
1	package dk.thoerup.traininfoservice.banedk;
2
3	import java.io.IOException;
4	import java.io.StringWriter;
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.transform.Templates;
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	import dk.thoerup.traininfoservice.TraininfoSettings;
23	import dk.thoerup.traininfoservice.banedk.DepartureFetcher.FetchTrainType;
24	import dk.thoerup.traininfoservice.db.StationDAO;
25
26	/**
27	* Servlet implementation class DepartureServlet
28	*/
29	@WebServlet(urlPatterns={"/DepartureServlet"})
30	public class DepartureServlet extends HttpServlet {
31	private static final long serialVersionUID = 1L;
32
33	Logger logger = Logger.getLogger( DepartureServlet.class.getName() );
34
35	DepartureFetcher fetcher;
36
37
38
39	TransformerFactory xslTransFact;
40	Templates xslTemplate;
41
42
43	@Override
44	public void init() throws ServletException {
45	super.init();
46
47
48	TraininfoSettings settings = (TraininfoSettings) getServletContext().getAttribute("settings");
49	fetcher = new DepartureFetcher(settings);
50
51	/*
52	xslTransFact = TransformerFactory.newInstance();
53
54	String xslPath = getServletContext().getRealPath("/departures.xsl");
55	Source stylesheet = new StreamSource( new File(xslPath) );
56
57	try {
58	xslTemplate = xslTransFact.newTemplates(stylesheet);
59	} catch (Exception e) {
60	throw new ServletException(e);
61	}*/
62	}
63
64	@Override
65	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
66	if (req.getParameter("station") == null \|\| req.getParameter("station").equals("") ) {
67	resp.sendError(400, "not enough parameters (station)");
68	return;
69	}
70	if (req.getParameter("format") == null \|\| req.getParameter("format").equals("")) {
71	resp.sendError(400, "not enough parameters (format)");
72	return;
73	}
74
75	boolean arrival = false;
76	try {
77	arrival = Integer.parseInt( req.getParameter("arrival")) != 0;
78	} catch (Exception e) {}
79
80	Statistics.getInstance().incrementDepartureLookups();
81
82	int station = Integer.parseInt( req.getParameter("station") );
83	String format = req.getParameter("format");
84
85	DepartureBean beans;
86
87	DepartureFetcher.FetchTrainType type = FetchTrainType.BOTH;
88	if ( req.getParameter("type") != null) {
89	type = FetchTrainType.valueOf( req.getParameter("type") );
90	}
91
92
93	try {
94	beans = fetcher.cachedLookupDepartures(station, arrival, type);
95	beans.arrival = arrival;
96	} catch (java.io.IOException ioe) {
97	logger.warning("Read failed, station="+station + ". " + ioe.getMessage() );
98	Statistics.getInstance().incrementDepartureErrors();
99	resp.sendError(500, "backend didnt answer");
100	return;
101	} catch (CircuitBreakerException cbe) {
102	logger.warning("Circuitbreaker - failing fast, station=" +station);
103	Statistics.getInstance().incrementDepartureErrors();
104	beans = generateErrorBean(1);
105	} catch (StationDAO.NostationException nse) {
106	logger.log(Level.WARNING, "Station not in Database, station=" +station);
107	Statistics.getInstance().incrementDepartureErrors();
108	resp.sendError(400, "invalid station ID");
109	return;
110	} catch (Exception e) {
111	logger.log(Level.WARNING, "Unknown exception, station=" +station, e);
112	Statistics.getInstance().incrementDepartureErrors();
113	resp.sendError(500);
114	return;
115	}
116
117	resp.setDateHeader("Expires", 0);
118	resp.setHeader("Cache-Control", "no-cache, must-revalidate");
119
120	if (format.equalsIgnoreCase("xml")) {
121	resp.setContentType("text/xml");
122	resp.getWriter().print( formatXml(beans) );
123	} else if (format.equalsIgnoreCase("html")) {
124
125	String advStr = req.getParameter("advanced");
126	boolean advanced = advStr != null ? Boolean.parseBoolean(advStr) : false;
127
128	req.setAttribute("advanced", advanced);
129	req.setAttribute("departurebeans", beans);
130	req.setAttribute("stationID", station );
131	getServletContext().getRequestDispatcher("/ViewDepartures.jsp").forward(req,resp);
132	/*resp.setContentType("text/html");
133	resp.getWriter().print( xmlToHtml(formatXml(beans)) );*/
134	} else {
135	resp.sendError(400, "Unknown format");
136	}
137	}
138
139	protected DepartureBean generateErrorBean(int code) {
140	DepartureBean bean = new DepartureBean();
141	bean.stationName="";
142	bean.errorCode = code;
143	return bean;
144	}
145
146	protected String formatXml(DepartureBean beans) throws ServletException{
147
148	Serializer serializer = new Persister();
149
150	StringWriter out = new StringWriter();
151
152	try {
153	serializer.write(beans, out);
154	} catch (Exception e) {
155	throw new ServletException(e);
156	}
157
158	return out.toString();
159	}
160	/*
161	protected String xmlToHtml(String input) throws ServletException {
162
163	try {
164	Transformer trans = xslTemplate.newTransformer();
165
166
167	Source xml = new StreamSource( new StringReader(input));
168	StringWriter out = new StringWriter();
169	trans.transform(xml, new StreamResult(out));
170
171	return out.toString();
172	} catch (Exception e) {
173	throw new ServletException(e);
174	}
175	}*/
176
177	}