traininfoservice/banedk/DepartureServlet.java

package dk.thoerup.traininfoservice.banedk;

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

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;

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
 */

public class DepartureServlet extends HttpServlet {
        private static final long serialVersionUID = 1L;
        
        Logger logger = Logger.getLogger( DepartureServlet.class.getName() );

        DepartureFetcher fetcher;


        String xslPath;
        

        @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);
                
                xslPath = getServletContext().getRealPath("/departures.xsl");
        }

        @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);
                        beans.arrival = 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) );
                } 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 String formatXml(DepartureBean beans) 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();
        }
        
        protected String xmlToHtml(String input)  {

                try {
                        Source stylesheet = new StreamSource( new File(xslPath) );
                
                
                        TransformerFactory transFact = TransformerFactory.newInstance();
                
                        Transformer trans = transFact.newTransformer(stylesheet);
                
                        Source xml = new StreamSource( new ByteArrayInputStream(input.getBytes() ));
                        ByteArrayOutputStream out = new ByteArrayOutputStream();
                        trans.transform(xml, new StreamResult(out));            
                
                        return out.toString();
                } catch (Exception e) {
                        return e.toString();
                }
        }

}
1	torben	307	package dk.thoerup.traininfoservice.banedk;
2
3	torben	1075	import java.io.ByteArrayInputStream;
4	torben	1060	import java.io.ByteArrayOutputStream;
5	torben	1075	import java.io.File;
6	torben	307	import java.io.IOException;
7	torben	348	import java.util.logging.Level;
8			import java.util.logging.Logger;
9	torben	307
10			import javax.servlet.ServletException;
11			import javax.servlet.http.HttpServlet;
12			import javax.servlet.http.HttpServletRequest;
13			import javax.servlet.http.HttpServletResponse;
14	torben	1075
15			import javax.xml.transform.Source;
16			import javax.xml.transform.Transformer;
17	torben	307	import javax.xml.transform.TransformerFactory;
18	torben	1075	import javax.xml.transform.stream.StreamResult;
19			import javax.xml.transform.stream.StreamSource;
20	torben	307
21	torben	1060	import org.simpleframework.xml.Serializer;
22			import org.simpleframework.xml.core.Persister;
23	torben	307
24	torben	1061	import dk.thoerup.android.traininfo.common.DepartureBean;
25	torben	468	import dk.thoerup.circuitbreaker.CircuitBreakerException;
26	torben	711	import dk.thoerup.traininfoservice.Statistics;
27	torben	307
28			/**
29			* Servlet implementation class DepartureServlet
30			*/
31	torben	1080
32	torben	307	public class DepartureServlet extends HttpServlet {
33			private static final long serialVersionUID = 1L;
34	torben	348
35			Logger logger = Logger.getLogger( DepartureServlet.class.getName() );
36	torben	307
37	torben	580	DepartureFetcher fetcher;
38	torben	1075
39
40	torben	307
41	torben	1075	String xslPath;
42
43	torben	307
44	torben	425	@Override
45	torben	580	public void init() throws ServletException {
46			super.init();
47	torben	584
48	torben	1034	boolean useAzureSite = Boolean.parseBoolean( getServletContext().getInitParameter("useazuresite") );
49	torben	584	int cacheTimeout = Integer.parseInt( getServletContext().getInitParameter("cache_timeout") );
50	torben	1026	int replyTimeout = Integer.parseInt( getServletContext().getInitParameter("reply_timeout") );
51	torben	1036	logger.info( "DepartureServlet, use azure site=" + useAzureSite + ", cache=" + cacheTimeout);
52	torben	1034	fetcher = new DepartureFetcher(useAzureSite, cacheTimeout, replyTimeout);
53	torben	1075
54			xslPath = getServletContext().getRealPath("/departures.xsl");
55	torben	580	}
56
57			@Override
58	torben	711	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
59	torben	458	if (req.getParameter("station") == null) {
60			resp.sendError(400, "not enough parameters");
61			return;
62			}
63	torben	829
64			boolean arrival = false;
65			try {
66			arrival = Integer.parseInt( req.getParameter("arrival")) != 0;
67			} catch (Exception e) {}
68
69	torben	711	Statistics.getInstance().incrementDepartureLookups();
70	torben	458
71	torben	307	int station = Integer.parseInt( req.getParameter("station") );
72			String format = req.getParameter("format");
73
74	torben	1021	DepartureBean beans;
75	torben	307
76			try {
77	torben	829	beans = fetcher.cachedLookupDepartures(station, arrival);
78	torben	1074	beans.arrival = arrival;
79	torben	462	} catch (java.io.IOException ioe) {
80			logger.warning("Read failed, station="+station + ". " + ioe.getMessage() );
81	torben	716	Statistics.getInstance().incrementDepartureErrors();
82	torben	348	resp.sendError(500);
83			return;
84	torben	421	} catch (CircuitBreakerException cbe) {
85			logger.warning("Circuitbreaker - failing fast");
86	torben	716	Statistics.getInstance().incrementDepartureErrors();
87	torben	421	resp.sendError(500);
88			return;
89	torben	451	} catch (Exception e) {
90	torben	348	logger.log(Level.WARNING, "Unknown exception, station=" +station, e);
91	torben	716	Statistics.getInstance().incrementDepartureErrors();
92	torben	348	resp.sendError(500);
93			return;
94	torben	307	}
95
96			resp.setDateHeader("Expires", 0);
97			resp.setHeader("Cache-Control", "no-cache, must-revalidate");
98
99			if (format.equalsIgnoreCase("xml")) {
100			resp.setContentType("text/xml");
101	torben	1074	resp.getWriter().print( formatXml(beans) );
102	torben	307	} else if (format.equalsIgnoreCase("html")) {
103	torben	1075	/*
104	torben	585	String advStr = req.getParameter("advanced");
105			boolean advanced = advStr != null ? Boolean.parseBoolean(advStr) : false;
106
107			req.setAttribute("advanced", advanced);
108	torben	307	req.setAttribute("departurebeans", beans);
109			req.setAttribute("stationID", station );
110	torben	1075	getServletContext().getRequestDispatcher("/ViewDepartures.jsp").forward(req,resp);*/
111			resp.setContentType("text/html");
112			resp.getWriter().print( xmlToHtml(formatXml(beans)) );
113	torben	307	} else {
114	torben	862	resp.sendError(400, "Unknown format");
115	torben	307	}
116
117			}
118
119	torben	1074	protected String formatXml(DepartureBean beans) throws ServletException{
120	torben	1060
121			Serializer serializer = new Persister();
122	torben	307
123	torben	1060	ByteArrayOutputStream out = new ByteArrayOutputStream();
124	torben	307
125	torben	1060	try {
126			serializer.write(beans, out);
127	torben	307	} catch (Exception e) {
128			throw new ServletException(e);
129			}
130	torben	1060
131			return out.toString();
132	torben	307	}
133	torben	1075
134			protected String xmlToHtml(String input) {
135	torben	307
136	torben	1075	try {
137			Source stylesheet = new StreamSource( new File(xslPath) );
138
139
140			TransformerFactory transFact = TransformerFactory.newInstance();
141
142			Transformer trans = transFact.newTransformer(stylesheet);
143
144			Source xml = new StreamSource( new ByteArrayInputStream(input.getBytes() ));
145			ByteArrayOutputStream out = new ByteArrayOutputStream();
146			trans.transform(xml, new StreamResult(out));
147
148			return out.toString();
149			} catch (Exception e) {
150			return e.toString();
151			}
152			}
153
154	torben	307	}