/[projects]/miscJava/CircuitBreaker/src/main/java/dk/thoerup/circuitbreaker/web/ViewCircuitBreaker.java
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Annotation of /miscJava/CircuitBreaker/src/main/java/dk/thoerup/circuitbreaker/web/ViewCircuitBreaker.java

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Revision 2569 - (hide annotations) (download)
Tue Jun 9 08:55:10 2015 UTC (8 years, 11 months ago) by torben
File size: 6635 byte(s) 
Statistics should be added by composition instead of inheritance
1 torben 467 package dk.thoerup.circuitbreaker.web;
2 torben 416
3 torben 417 import java.util.Date;
4 torben 1844 import java.util.Formatter;
5 torben 1285 import java.util.LinkedList;
6 torben 417
7 torben 416 import javax.servlet.http.HttpServletRequest;
8     import javax.servlet.http.HttpServletResponse;
9    
10 torben 467 import dk.thoerup.circuitbreaker.CircuitBreaker;
11     import dk.thoerup.circuitbreaker.CircuitBreakerManager;
12 torben 2569 import dk.thoerup.circuitbreaker.statistics.AccountingStatistics;
13     import dk.thoerup.circuitbreaker.statistics.LoggingStatistics;
14     import dk.thoerup.circuitbreaker.statistics.Statistics;
15 torben 416
16     public class ViewCircuitBreaker implements Command {
17 torben 417
18     private boolean readOnly;
19    
20     public ViewCircuitBreaker(boolean readOnly) {
21     this.readOnly = readOnly;
22     }
23 torben 416
24 torben 417 private String actionBuilder(String uri, String action, String breaker) {
25     StringBuilder sb = new StringBuilder();
26     sb.append("<form action=\"").append(uri).append("\" method=\"post\">");
27     sb.append("<input type=\"hidden\" name=\"command\" value=\"action\">\n");
28     sb.append("<input type=\"hidden\" name=\"breaker\" value=\"").append(breaker).append("\">\n");
29     sb.append("<input type=\"hidden\" name=\"action\" value=\"").append(action).append("\">\n");
30     sb.append("<input type=\"submit\" value=\"").append(action).append("\">\n");
31     sb.append("</form>");
32    
33     return sb.toString();
34     }
35    
36 torben 448 public String getStateBar(CircuitBreaker breaker) {
37 torben 417 StringBuilder sb = new StringBuilder();
38 torben 448 sb.append( breaker.getStateName() );
39 torben 417 sb.append(": <span style=\"background-color: ");
40 torben 448 if ( breaker.isOpen() ) {
41 torben 417 sb.append("red");
42 torben 448 } else if ( breaker.isClosed() ) {
43 torben 417 sb.append("green");
44     } else {
45     sb.append("yellow");
46     }
47     sb.append("\">&nbsp;&nbsp;&nbsp;<span>");
48    
49     return sb.toString();
50     }
51    
52 torben 1291 public static String formatDate(long date) {
53 torben 628 if (date == 0L) {
54     return "-";
55     } else {
56     return new Date(date).toString();
57     }
58     }
59    
60 torben 416 public String execute(HttpServletRequest req, HttpServletResponse resp) {
61     CircuitBreaker breaker = CircuitBreakerManager.getManager().getCircuitBreaker( req.getParameter("breaker"));
62 torben 417 String uri = req.getRequestURI();
63 torben 416
64     if (breaker == null)
65     return "<html><body><h2>No breaker named '" + req.getParameter("breaker") + "'</h2></body></html>";
66    
67 torben 2569 Statistics stats = breaker.getStatistics();
68    
69 torben 416 StringBuilder sb = new StringBuilder();
70    
71     sb.append("<html><head><title>View Circuitbreaker</title></head><body>");
72     sb.append("<<== <a href=\"").append(req.getRequestURI()).append("\">Back to overview</a><br><br>");
73     sb.append("<h2>CircuitBreaker</h2>\n");
74 torben 2569
75 torben 416
76     sb.append("<b>Attributes:</b>\n");
77     sb.append("<table border=\"1\" cellspacing=0>");
78     sb.append("<tr><td>Name </td><td>").append(breaker.getName()).append("</td></tr>\n");
79 torben 461 sb.append("<tr><td>State </td><td><b>").append( getStateBar(breaker) ).append("</b></td></tr>\n");
80 torben 416 sb.append("<tr><td>Type </td><td>").append(breaker.getClass().getSimpleName() ).append("</td></tr>\n");
81     sb.append("<tr><td>Notifier </td><td>").append(breaker.getNotifierName()).append("</td></tr>\n");
82 torben 2569 sb.append("<tr><td>Statistics </td><td>").append( stats.getClass().getSimpleName() ).append("</td></tr>\n");
83 torben 416 sb.append("<tr><td>Failure count </td><td>").append(breaker.getFailureCount()).append("</td></tr>\n");
84     sb.append("<tr><td>Failure threshold </td><td>").append(breaker.getThreshold()).append("</td></tr>\n");
85     sb.append("<tr><td>Timeout, elapsed</td><td>").append( breaker.getElapsed() ).append("</td></tr>\n");
86     sb.append("<tr><td>Timeout, limit</td><td>").append( breaker.getTimeout() ).append("</td></tr>\n");
87 torben 417
88 torben 2569
89    
90     if (stats instanceof AccountingStatistics) {
91     AccountingStatistics ac = (AccountingStatistics) stats;
92 torben 1844
93     StringBuilder sbf = new StringBuilder();
94 torben 2569 if (ac.getTotalCallCount() > 0) {
95     double failure_percentage = ((double) ac.getTotalFailureCount()*100) / ((double) ac.getTotalCallCount() );
96 torben 1846 Formatter formatter = new Formatter(sbf);
97     formatter.format("%.2f", failure_percentage);
98 torben 2075 formatter.close();
99 torben 1846 } else {
100     sbf.append("0.0");
101     }
102 torben 1844
103    
104 torben 417 sb.append("<tr><th colspan=\"2\">Accounting</th></tr>\n");
105 torben 2569 sb.append("<tr><td>Trip count</td><td>").append( ac.getTripCount() ).append("</td></tr>\n");
106     sb.append("<tr><td>Re-trip count</td><td>").append( ac.getRetripCount() ).append("</td></tr>\n");
107     sb.append("<tr><td>Block count</td><td>").append( ac.getBlockCount() ).append("</td></tr>\n");
108     sb.append("<tr><td>Total failure count</td><td>").append( ac.getTotalFailureCount() ).append("</td></tr>\n");
109     sb.append("<tr><td>Total Call count</td><td>").append( ac.getTotalCallCount() ).append("</td></tr>\n");
110 torben 1845 sb.append("<tr><td>Failure Percentage</td><td>").append( sbf.toString() ).append("%</td></tr>\n");
111 torben 2569 sb.append("<tr><td>Last failure</td><td>").append( formatDate(ac.getLastFailure()) ).append("</td></tr>\n");
112     sb.append("<tr><td>Last trip</td><td>").append( formatDate(ac.getLastTrip()) ).append("</td></tr>\n");
113     sb.append("<tr><td>Last re-trip</td><td>").append( formatDate(ac.getLastRetrip()) ).append("</td></tr>\n");
114     sb.append("<tr><td>Last reset</td><td>").append( formatDate(ac.getLastReset()) ).append("</td></tr>\n");
115 torben 624
116 torben 2569 sb.append("<tr><td>Last resetCounters</td><td>").append( formatDate(ac.getLastResetCounters()) ).append("</td></tr>\n");
117 torben 416 }
118 torben 1285
119 torben 2569 if (stats instanceof LoggingStatistics) {
120     LoggingStatistics ls = (LoggingStatistics) stats;
121 torben 1285
122 torben 2569 LinkedList<LoggingStatistics.LogEntry> list = ls.getLog();
123 torben 1291 String headerLink = String.format("<a href=\"%s?command=log&breaker=%s\">Logging</a>", req.getRequestURI(), breaker.getName() );
124 torben 1285
125 torben 1291 sb.append("<tr><th colspan=\"2\">").append(headerLink).append("</th></tr>\n");
126    
127     int max = list.size() > 10 ? 10 : list.size();
128     for (int i=0; i<max; i++) {
129 torben 2569 LoggingStatistics.LogEntry entry = list.get(i);
130 torben 1287 sb.append("<tr><td colspan=\"2\">");
131 torben 1293 sb.append( entry.toString() );
132 torben 1285 sb.append("</td></tr>");
133     }
134     }
135 torben 416
136 torben 698 sb.append("</table>\n");
137     sb.append("Current time: ").append( new Date().toString() ).append("<br><br>\n");
138 torben 416
139 torben 417 sb.append("<b>Operations:</b>\n");
140     if ( !readOnly ) {
141     sb.append( actionBuilder(uri, "reset", breaker.getName())).append("<br>\n");
142     sb.append( actionBuilder(uri, "tripBreaker", breaker.getName())).append("<br>\n");
143 torben 2569 if (stats instanceof AccountingStatistics ) {
144 torben 417 sb.append( actionBuilder(uri, "resetCounters", breaker.getName())).append("<br>\n");
145     }
146 torben 2569 if (stats instanceof LoggingStatistics ) {
147 torben 1292 sb.append( actionBuilder(uri, "clearLog", breaker.getName())).append("<br>\n");
148     }
149 torben 417 } else {
150     sb.append("<i>the CircuitBreakers can only be viewed</i>");
151     }
152 torben 416
153     sb.append("</body></html>");
154    
155     return sb.toString();
156     }
157    
158     }
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