traininfoservice/banedk/TimetableServlet.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 org.simpleframework.xml.Serializer;
import org.simpleframework.xml.core.Persister;

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

/**
 * Servlet implementation class TimetableServlet
 */
@WebServlet(urlPatterns={"/TimetableServlet"})
public class TimetableServlet extends HttpServlet {
        private static final long serialVersionUID = 1L;
       
        
        Logger logger = Logger.getLogger( TimetableServlet.class.getName() );
        
        TimetableFetcher fetcher;
        
        
        @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( "TimetableServlet, use azure site=" + useAzureSite + ", cache=" + cacheTimeout);
                fetcher = new TimetableFetcher(useAzureSite,cacheTimeout,replyTimeout);
        }
        
        @Override
        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
                if (request.getParameter("train") == null) {
                        response.sendError(400, "not enough parameters (train)");
                        return;
                }
                if (request.getParameter("type") == null) {
                        response.sendError(400, "not enough parameters (type)");
                        return;
                }
                Statistics.getInstance().incrementTimetableLookups();
                
                String train = request.getParameter("train").trim();
                String type = request.getParameter("type").trim();
                                
                try
                {
                        TimetableBean timetable = fetcher.cachedLookupTimetable(train, type);
                
                        String responseXML = formatTimetable(timetable);
                
                        response.setContentType("text/xml");
                        response.getWriter().print(responseXML);
                } catch (java.io.IOException ioe) {
                        logger.warning("(timetable) Read failed, type=" + type + ", train="+train + ". " + ioe.getMessage());
                        Statistics.getInstance().incrementTimetableErrors();
                        response.sendError(500, "Backend timed out");
                } catch (CircuitBreakerException cbe) {
                        logger.warning("Circuitbreaker - failing fast");
                        Statistics.getInstance().incrementTimetableErrors();
                        response.sendError(500);
                }catch (Exception e) {
                        logger.log(Level.WARNING, "failure looking up timetable: type=" + type + ",train=" +train, e);
                        Statistics.getInstance().incrementTimetableErrors();
                        response.sendError(500);
                }
                
        }
        
        String formatTimetable(TimetableBean timetable) throws ServletException {
                Serializer serializer = new Persister();

                ByteArrayOutputStream out = new ByteArrayOutputStream();

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

}
1	torben	350	package dk.thoerup.traininfoservice.banedk;
2
3	torben	1060	import java.io.ByteArrayOutputStream;
4	torben	350	import java.io.IOException;
5	torben	1060
6	torben	378	import java.util.logging.Level;
7	torben	350	import java.util.logging.Logger;
8
9			import javax.servlet.ServletException;
10	torben	958	import javax.servlet.annotation.WebServlet;
11	torben	350	import javax.servlet.http.HttpServlet;
12			import javax.servlet.http.HttpServletRequest;
13			import javax.servlet.http.HttpServletResponse;
14
15	torben	1060	import org.simpleframework.xml.Serializer;
16			import org.simpleframework.xml.core.Persister;
17
18	torben	468	import dk.thoerup.circuitbreaker.CircuitBreakerException;
19	torben	711	import dk.thoerup.traininfoservice.Statistics;
20	torben	421
21	torben	350	/**
22			* Servlet implementation class TimetableServlet
23			*/
24	torben	958	@WebServlet(urlPatterns={"/TimetableServlet"})
25	torben	350	public class TimetableServlet extends HttpServlet {
26			private static final long serialVersionUID = 1L;
27
28
29			Logger logger = Logger.getLogger( TimetableServlet.class.getName() );
30
31	torben	581	TimetableFetcher fetcher;
32	torben	350
33	torben	1026
34	torben	425	@Override
35	torben	581	public void init() throws ServletException {
36			super.init();
37
38	torben	1036	boolean useAzureSite = Boolean.parseBoolean( getServletContext().getInitParameter("useazuresite") );
39	torben	584	int cacheTimeout = Integer.parseInt( getServletContext().getInitParameter("cache_timeout") );
40	torben	1026	int replyTimeout = Integer.parseInt( getServletContext().getInitParameter("reply_timeout") );
41	torben	1036	logger.info( "TimetableServlet, use azure site=" + useAzureSite + ", cache=" + cacheTimeout);
42			fetcher = new TimetableFetcher(useAzureSite,cacheTimeout,replyTimeout);
43	torben	581	}
44
45			@Override
46	torben	350	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
47	torben	458	if (request.getParameter("train") == null) {
48	torben	717	response.sendError(400, "not enough parameters (train)");
49	torben	458	return;
50			}
51	torben	717	if (request.getParameter("type") == null) {
52			response.sendError(400, "not enough parameters (type)");
53			return;
54			}
55	torben	711	Statistics.getInstance().incrementTimetableLookups();
56	torben	458
57	torben	350	String train = request.getParameter("train").trim();
58	torben	717	String type = request.getParameter("type").trim();
59	torben	697
60	torben	350	try
61			{
62	torben	1060	TimetableBean timetable = fetcher.cachedLookupTimetable(train, type);
63	torben	350
64			String responseXML = formatTimetable(timetable);
65
66			response.setContentType("text/xml");
67			response.getWriter().print(responseXML);
68	torben	462	} catch (java.io.IOException ioe) {
69	torben	717	logger.warning("(timetable) Read failed, type=" + type + ", train="+train + ". " + ioe.getMessage());
70	torben	716	Statistics.getInstance().incrementTimetableErrors();
71	torben	378	response.sendError(500, "Backend timed out");
72	torben	421	} catch (CircuitBreakerException cbe) {
73			logger.warning("Circuitbreaker - failing fast");
74	torben	716	Statistics.getInstance().incrementTimetableErrors();
75	torben	421	response.sendError(500);
76	torben	451	}catch (Exception e) {
77	torben	717	logger.log(Level.WARNING, "failure looking up timetable: type=" + type + ",train=" +train, e);
78	torben	716	Statistics.getInstance().incrementTimetableErrors();
79	torben	378	response.sendError(500);
80	torben	350	}
81
82			}
83
84	torben	1060	String formatTimetable(TimetableBean timetable) throws ServletException {
85			Serializer serializer = new Persister();
86
87			ByteArrayOutputStream out = new ByteArrayOutputStream();
88
89			try {
90			serializer.write(timetable, out);
91			} catch (Exception e) {
92			throw new ServletException(e);
93	torben	350	}
94
95	torben	1060	return out.toString();
96	torben	350	}
97
98			}