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.annotation.WebServlet;
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
 */
@WebServlet(urlPatterns={"/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	torben	958	import javax.servlet.annotation.WebServlet;
12	torben	307	import javax.servlet.http.HttpServlet;
13			import javax.servlet.http.HttpServletRequest;
14			import javax.servlet.http.HttpServletResponse;
15	torben	1075
16			import javax.xml.transform.Source;
17			import javax.xml.transform.Transformer;
18	torben	307	import javax.xml.transform.TransformerFactory;
19	torben	1075	import javax.xml.transform.stream.StreamResult;
20			import javax.xml.transform.stream.StreamSource;
21	torben	307
22	torben	1060	import org.simpleframework.xml.Serializer;
23			import org.simpleframework.xml.core.Persister;
24	torben	307
25	torben	1061	import dk.thoerup.android.traininfo.common.DepartureBean;
26	torben	468	import dk.thoerup.circuitbreaker.CircuitBreakerException;
27	torben	711	import dk.thoerup.traininfoservice.Statistics;
28	torben	307
29			/**
30			* Servlet implementation class DepartureServlet
31			*/
32	torben	958	@WebServlet(urlPatterns={"/DepartureServlet"})
33	torben	307	public class DepartureServlet extends HttpServlet {
34			private static final long serialVersionUID = 1L;
35	torben	348
36			Logger logger = Logger.getLogger( DepartureServlet.class.getName() );
37	torben	307
38	torben	580	DepartureFetcher fetcher;
39	torben	1075
40
41	torben	307
42	torben	1075	String xslPath;
43
44	torben	307
45	torben	425	@Override
46	torben	580	public void init() throws ServletException {
47			super.init();
48	torben	584
49	torben	1034	boolean useAzureSite = Boolean.parseBoolean( getServletContext().getInitParameter("useazuresite") );
50	torben	584	int cacheTimeout = Integer.parseInt( getServletContext().getInitParameter("cache_timeout") );
51	torben	1026	int replyTimeout = Integer.parseInt( getServletContext().getInitParameter("reply_timeout") );
52	torben	1036	logger.info( "DepartureServlet, use azure site=" + useAzureSite + ", cache=" + cacheTimeout);
53	torben	1034	fetcher = new DepartureFetcher(useAzureSite, cacheTimeout, replyTimeout);
54	torben	1075
55			xslPath = getServletContext().getRealPath("/departures.xsl");
56	torben	580	}
57
58			@Override
59	torben	711	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
60	torben	458	if (req.getParameter("station") == null) {
61			resp.sendError(400, "not enough parameters");
62			return;
63			}
64	torben	829
65			boolean arrival = false;
66			try {
67			arrival = Integer.parseInt( req.getParameter("arrival")) != 0;
68			} catch (Exception e) {}
69
70	torben	711	Statistics.getInstance().incrementDepartureLookups();
71	torben	458
72	torben	307	int station = Integer.parseInt( req.getParameter("station") );
73			String format = req.getParameter("format");
74
75	torben	1021	DepartureBean beans;
76	torben	307
77			try {
78	torben	829	beans = fetcher.cachedLookupDepartures(station, arrival);
79	torben	1074	beans.arrival = arrival;
80	torben	462	} catch (java.io.IOException ioe) {
81			logger.warning("Read failed, station="+station + ". " + ioe.getMessage() );
82	torben	716	Statistics.getInstance().incrementDepartureErrors();
83	torben	348	resp.sendError(500);
84			return;
85	torben	421	} catch (CircuitBreakerException cbe) {
86			logger.warning("Circuitbreaker - failing fast");
87	torben	716	Statistics.getInstance().incrementDepartureErrors();
88	torben	421	resp.sendError(500);
89			return;
90	torben	451	} catch (Exception e) {
91	torben	348	logger.log(Level.WARNING, "Unknown exception, station=" +station, e);
92	torben	716	Statistics.getInstance().incrementDepartureErrors();
93	torben	348	resp.sendError(500);
94			return;
95	torben	307	}
96
97			resp.setDateHeader("Expires", 0);
98			resp.setHeader("Cache-Control", "no-cache, must-revalidate");
99
100			if (format.equalsIgnoreCase("xml")) {
101			resp.setContentType("text/xml");
102	torben	1074	resp.getWriter().print( formatXml(beans) );
103	torben	307	} else if (format.equalsIgnoreCase("html")) {
104	torben	1075	/*
105	torben	585	String advStr = req.getParameter("advanced");
106			boolean advanced = advStr != null ? Boolean.parseBoolean(advStr) : false;
107
108			req.setAttribute("advanced", advanced);
109	torben	307	req.setAttribute("departurebeans", beans);
110			req.setAttribute("stationID", station );
111	torben	1075	getServletContext().getRequestDispatcher("/ViewDepartures.jsp").forward(req,resp);*/
112			resp.setContentType("text/html");
113			resp.getWriter().print( xmlToHtml(formatXml(beans)) );
114	torben	307	} else {
115	torben	862	resp.sendError(400, "Unknown format");
116	torben	307	}
117
118			}
119
120	torben	1074	protected String formatXml(DepartureBean beans) throws ServletException{
121	torben	1060
122			Serializer serializer = new Persister();
123	torben	307
124	torben	1060	ByteArrayOutputStream out = new ByteArrayOutputStream();
125	torben	307
126	torben	1060	try {
127			serializer.write(beans, out);
128	torben	307	} catch (Exception e) {
129			throw new ServletException(e);
130			}
131	torben	1060
132			return out.toString();
133	torben	307	}
134	torben	1075
135			protected String xmlToHtml(String input) {
136	torben	307
137	torben	1075	try {
138			Source stylesheet = new StreamSource( new File(xslPath) );
139
140
141			TransformerFactory transFact = TransformerFactory.newInstance();
142
143			Transformer trans = transFact.newTransformer(stylesheet);
144
145			Source xml = new StreamSource( new ByteArrayInputStream(input.getBytes() ));
146			ByteArrayOutputStream out = new ByteArrayOutputStream();
147			trans.transform(xml, new StreamResult(out));
148
149			return out.toString();
150			} catch (Exception e) {
151			return e.toString();
152			}
153			}
154
155	torben	307	}