traininfoservice/banedk/TimetableServlet.java

package dk.thoerup.traininfoservice.banedk;

import java.io.IOException;
import java.util.List;
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 dk.thoerup.circuitbreaker.CircuitBreakerException;
import dk.thoerup.traininfoservice.Statistics;

/**
 * Servlet implementation class 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 useTempSite =  Boolean.parseBoolean( getServletContext().getInitParameter("usetempsite") );
                int cacheTimeout =  Integer.parseInt( getServletContext().getInitParameter("cache_timeout") );
                logger.info( "TimetableServlet, use temp site=" + useTempSite + ", cache=" + cacheTimeout);
                fetcher = new TimetableFetcher(useTempSite,cacheTimeout);
        }
        
        @Override
        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
                if (request.getParameter("train") == null) {
                        response.sendError(400, "not enough parameters");
                        return;
                }
                Statistics.getInstance().incrementTimetableLookups();
                
                String train = request.getParameter("train").trim();
                String trainID;
                String type = request.getParameter("type");
                
                if (type != null) {
                         trainID = train;
                } else { //remove this failover sometime after release of client 0.6.4 
                        String sections[] = train.split(" ");
                        if (sections.length != 2) {
                                response.sendError(400, "Invalid parameter");
                                return;
                        }
                                
                        type = lookupType(sections[0]);
                        trainID = sections[1];
                }
                
                try
                {
                        List<TimetableBean> timetable = fetcher.cachedLookupTimetable(trainID, type);
                
                        String responseXML = formatTimetable(timetable);
                
                        response.setContentType("text/xml");
                        response.getWriter().print(responseXML);
                } catch (java.io.IOException ioe) {
                        logger.warning("(timetable) Read failed, 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: train=" +train, e);
                        Statistics.getInstance().incrementTimetableErrors();
                        response.sendError(500);
                }
                
        }
        /*remove /outcomment/deprecate after 0.6.4 release */
        String lookupType(String trainCode) {
                trainCode = trainCode.toLowerCase();
                
                if (trainCode.equals("a") || trainCode.equals("b") || trainCode.equals("bx") || trainCode.equals("c") || 
                                trainCode.equals("e") || trainCode.equals("f") || trainCode.equals("h")) {
                        return "S2";
                } else {
                        return "FJRN";
                }
        }
        
        String formatTimetable(List<TimetableBean> timetable) {
                StringBuffer sb = new StringBuffer();
                
                sb.append("<timetable>");
                
                for (TimetableBean bean : timetable) {
                        sb.append("<entry");
                        if (bean.isCurrent())
                                sb.append(" current=\"true\"");
                        sb.append(">");
                        
                        sb.append("<station>").append( bean.getStation() ).append("</station>");
                        sb.append("<arrival>").append( bean.getArrival() ).append("</arrival>");
                        sb.append("<departure>").append( bean.getDeparture() ).append("</departure>");
                        
                        sb.append("</entry>");
                }
                
                sb.append("</timetable>");
                
                return sb.toString();
        }

}
1	package dk.thoerup.traininfoservice.banedk;
2
3	import java.io.IOException;
4	import java.util.List;
5	import java.util.logging.Level;
6	import java.util.logging.Logger;
7
8	import javax.servlet.ServletException;
9	import javax.servlet.http.HttpServlet;
10	import javax.servlet.http.HttpServletRequest;
11	import javax.servlet.http.HttpServletResponse;
12
13	import dk.thoerup.circuitbreaker.CircuitBreakerException;
14	import dk.thoerup.traininfoservice.Statistics;
15
16	/**
17	* Servlet implementation class TimetableServlet
18	*/
19	public class TimetableServlet extends HttpServlet {
20	private static final long serialVersionUID = 1L;
21
22
23	Logger logger = Logger.getLogger( TimetableServlet.class.getName() );
24
25	TimetableFetcher fetcher;
26
27	@Override
28	public void init() throws ServletException {
29	super.init();
30
31	boolean useTempSite = Boolean.parseBoolean( getServletContext().getInitParameter("usetempsite") );
32	int cacheTimeout = Integer.parseInt( getServletContext().getInitParameter("cache_timeout") );
33	logger.info( "TimetableServlet, use temp site=" + useTempSite + ", cache=" + cacheTimeout);
34	fetcher = new TimetableFetcher(useTempSite,cacheTimeout);
35	}
36
37	@Override
38	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
39	if (request.getParameter("train") == null) {
40	response.sendError(400, "not enough parameters");
41	return;
42	}
43	Statistics.getInstance().incrementTimetableLookups();
44
45	String train = request.getParameter("train").trim();
46	String trainID;
47	String type = request.getParameter("type");
48
49	if (type != null) {
50	trainID = train;
51	} else { //remove this failover sometime after release of client 0.6.4
52	String sections[] = train.split(" ");
53	if (sections.length != 2) {
54	response.sendError(400, "Invalid parameter");
55	return;
56	}
57
58	type = lookupType(sections[0]);
59	trainID = sections[1];
60	}
61
62	try
63	{
64	List<TimetableBean> timetable = fetcher.cachedLookupTimetable(trainID, type);
65
66	String responseXML = formatTimetable(timetable);
67
68	response.setContentType("text/xml");
69	response.getWriter().print(responseXML);
70	} catch (java.io.IOException ioe) {
71	logger.warning("(timetable) Read failed, train="+train + ". " + ioe.getMessage());
72	Statistics.getInstance().incrementTimetableErrors();
73	response.sendError(500, "Backend timed out");
74	} catch (CircuitBreakerException cbe) {
75	logger.warning("Circuitbreaker - failing fast");
76	Statistics.getInstance().incrementTimetableErrors();
77	response.sendError(500);
78	}catch (Exception e) {
79	logger.log(Level.WARNING, "failure looking up timetable: train=" +train, e);
80	Statistics.getInstance().incrementTimetableErrors();
81	response.sendError(500);
82	}
83
84	}
85	/remove /outcomment/deprecate after 0.6.4 release /
86	String lookupType(String trainCode) {
87	trainCode = trainCode.toLowerCase();
88
89	if (trainCode.equals("a") \|\| trainCode.equals("b") \|\| trainCode.equals("bx") \|\| trainCode.equals("c") \|\|
90	trainCode.equals("e") \|\| trainCode.equals("f") \|\| trainCode.equals("h")) {
91	return "S2";
92	} else {
93	return "FJRN";
94	}
95	}
96
97	String formatTimetable(List<TimetableBean> timetable) {
98	StringBuffer sb = new StringBuffer();
99
100	sb.append("<timetable>");
101
102	for (TimetableBean bean : timetable) {
103	sb.append("<entry");
104	if (bean.isCurrent())
105	sb.append(" current=\"true\"");
106	sb.append(">");
107
108	sb.append("<station>").append( bean.getStation() ).append("</station>");
109	sb.append("<arrival>").append( bean.getArrival() ).append("</arrival>");
110	sb.append("<departure>").append( bean.getDeparture() ).append("</departure>");
111
112	sb.append("</entry>");
113	}
114
115	sb.append("</timetable>");
116
117	return sb.toString();
118	}
119
120	}