/[projects]/CircuitBreaker/src/dk/thoerup/circuitbreaker/web/ViewCircuitBreaker.java
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Contents of /CircuitBreaker/src/dk/thoerup/circuitbreaker/web/ViewCircuitBreaker.java

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Revision 1844 - (show annotations) (download)
Fri Aug 31 06:33:12 2012 UTC (11 years, 9 months ago) by torben
File size: 6359 byte(s) 
report the failure percentage on circuitbreaker web-page
1 package dk.thoerup.circuitbreaker.web;
2
3 import java.util.Date;
4 import java.util.Formatter;
5 import java.util.LinkedList;
6
7 import javax.servlet.http.HttpServletRequest;
8 import javax.servlet.http.HttpServletResponse;
9
10 import dk.thoerup.circuitbreaker.AccountingCircuitBreaker;
11 import dk.thoerup.circuitbreaker.LoggingCircuitBreaker;
12 import dk.thoerup.circuitbreaker.CircuitBreaker;
13 import dk.thoerup.circuitbreaker.CircuitBreakerManager;
14
15 public class ViewCircuitBreaker implements Command {
16
17 private boolean readOnly;
18
19 public ViewCircuitBreaker(boolean readOnly) {
20 this.readOnly = readOnly;
21 }
22
23 private String actionBuilder(String uri, String action, String breaker) {
24 StringBuilder sb = new StringBuilder();
25 sb.append("<form action=\"").append(uri).append("\" method=\"post\">");
26 sb.append("<input type=\"hidden\" name=\"command\" value=\"action\">\n");
27 sb.append("<input type=\"hidden\" name=\"breaker\" value=\"").append(breaker).append("\">\n");
28 sb.append("<input type=\"hidden\" name=\"action\" value=\"").append(action).append("\">\n");
29 sb.append("<input type=\"submit\" value=\"").append(action).append("\">\n");
30 sb.append("</form>");
31
32 return sb.toString();
33 }
34
35 public String getStateBar(CircuitBreaker breaker) {
36 StringBuilder sb = new StringBuilder();
37 sb.append( breaker.getStateName() );
38 sb.append(": <span style=\"background-color: ");
39 if ( breaker.isOpen() ) {
40 sb.append("red");
41 } else if ( breaker.isClosed() ) {
42 sb.append("green");
43 } else {
44 sb.append("yellow");
45 }
46 sb.append("\">&nbsp;&nbsp;&nbsp;<span>");
47
48 return sb.toString();
49 }
50
51 public static String formatDate(long date) {
52 if (date == 0L) {
53 return "-";
54 } else {
55 return new Date(date).toString();
56 }
57 }
58
59 public String execute(HttpServletRequest req, HttpServletResponse resp) {
60 CircuitBreaker breaker = CircuitBreakerManager.getManager().getCircuitBreaker( req.getParameter("breaker"));
61 String uri = req.getRequestURI();
62
63 if (breaker == null)
64 return "<html><body><h2>No breaker named '" + req.getParameter("breaker") + "'</h2></body></html>";
65
66 StringBuilder sb = new StringBuilder();
67
68 sb.append("<html><head><title>View Circuitbreaker</title></head><body>");
69 sb.append("<<== <a href=\"").append(req.getRequestURI()).append("\">Back to overview</a><br><br>");
70 sb.append("<h2>CircuitBreaker</h2>\n");
71
72
73 sb.append("<b>Attributes:</b>\n");
74 sb.append("<table border=\"1\" cellspacing=0>");
75 sb.append("<tr><td>Name </td><td>").append(breaker.getName()).append("</td></tr>\n");
76 sb.append("<tr><td>State </td><td><b>").append( getStateBar(breaker) ).append("</b></td></tr>\n");
77 sb.append("<tr><td>Type </td><td>").append(breaker.getClass().getSimpleName() ).append("</td></tr>\n");
78 sb.append("<tr><td>Notifier </td><td>").append(breaker.getNotifierName()).append("</td></tr>\n");
79 sb.append("<tr><td>Failure count </td><td>").append(breaker.getFailureCount()).append("</td></tr>\n");
80 sb.append("<tr><td>Failure threshold </td><td>").append(breaker.getThreshold()).append("</td></tr>\n");
81 sb.append("<tr><td>Timeout, elapsed</td><td>").append( breaker.getElapsed() ).append("</td></tr>\n");
82 sb.append("<tr><td>Timeout, limit</td><td>").append( breaker.getTimeout() ).append("</td></tr>\n");
83
84 if (breaker instanceof AccountingCircuitBreaker) {
85 AccountingCircuitBreaker acb = (AccountingCircuitBreaker) breaker;
86
87 double failure_percentage = ((double) acb.getTotalFailureCount()*100) / ((double) acb.getTotalCallCount() );
88 StringBuilder sbf = new StringBuilder();
89 Formatter formatter = new Formatter(sb);
90 formatter.format("%.2f", failure_percentage);
91
92
93 sb.append("<tr><th colspan=\"2\">Accounting</th></tr>\n");
94 sb.append("<tr><td>Trip count</td><td>").append( acb.getTripCount() ).append("</td></tr>\n");
95 sb.append("<tr><td>Re-trip count</td><td>").append( acb.getRetripCount() ).append("</td></tr>\n");
96 sb.append("<tr><td>Block count</td><td>").append( acb.getBlockCount() ).append("</td></tr>\n");
97 sb.append("<tr><td>Total failure count</td><td>").append( acb.getTotalFailureCount() ).append("</td></tr>\n");
98 sb.append("<tr><td>Total Call count</td><td>").append( acb.getTotalCallCount() ).append("</td></tr>\n");
99 sb.append("<tr><td>Failure Percentage</td><td>").append( sb.toString() ).append("%</td></tr>\n");
100 sb.append("<tr><td>Last failure</td><td>").append( formatDate(acb.getLastFailure()) ).append("</td></tr>\n");
101 sb.append("<tr><td>Last trip</td><td>").append( formatDate(acb.getLastTrip()) ).append("</td></tr>\n");
102 sb.append("<tr><td>Last re-trip</td><td>").append( formatDate(acb.getLastRetrip()) ).append("</td></tr>\n");
103 sb.append("<tr><td>Last reset</td><td>").append( formatDate(acb.getLastReset()) ).append("</td></tr>\n");
104
105 sb.append("<tr><td>Last resetCounters</td><td>").append( formatDate(acb.getLastResetCounters()) ).append("</td></tr>\n");
106 }
107
108 if (breaker instanceof LoggingCircuitBreaker) {
109 LoggingCircuitBreaker lcb = (LoggingCircuitBreaker) breaker;
110
111 LinkedList<LoggingCircuitBreaker.LogEntry> list = lcb.getLog();
112 String headerLink = String.format("<a href=\"%s?command=log&breaker=%s\">Logging</a>", req.getRequestURI(), breaker.getName() );
113
114 sb.append("<tr><th colspan=\"2\">").append(headerLink).append("</th></tr>\n");
115
116 int max = list.size() > 10 ? 10 : list.size();
117 for (int i=0; i<max; i++) {
118 LoggingCircuitBreaker.LogEntry entry = list.get(i);
119 sb.append("<tr><td colspan=\"2\">");
120 sb.append( entry.toString() );
121 sb.append("</td></tr>");
122 }
123 }
124
125 sb.append("</table>\n");
126 sb.append("Current time: ").append( new Date().toString() ).append("<br><br>\n");
127
128 sb.append("<b>Operations:</b>\n");
129 if ( !readOnly ) {
130 sb.append( actionBuilder(uri, "reset", breaker.getName())).append("<br>\n");
131 sb.append( actionBuilder(uri, "tripBreaker", breaker.getName())).append("<br>\n");
132 if (breaker instanceof AccountingCircuitBreaker ) {
133 sb.append( actionBuilder(uri, "resetCounters", breaker.getName())).append("<br>\n");
134 }
135 if (breaker instanceof LoggingCircuitBreaker ) {
136 sb.append( actionBuilder(uri, "clearLog", breaker.getName())).append("<br>\n");
137 }
138 } else {
139 sb.append("<i>the CircuitBreakers can only be viewed</i>");
140 }
141
142 sb.append("</body></html>");
143
144 return sb.toString();
145 }
146
147 }
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