/[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 2449 - (hide annotations) (download)
Fri Mar 20 08:58:46 2015 UTC (9 years, 2 months ago) by torben
File size: 6465 byte(s) 
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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.AccountingCircuitBreaker;
11 torben 1285 import dk.thoerup.circuitbreaker.LoggingCircuitBreaker;
12 torben 467 import dk.thoerup.circuitbreaker.CircuitBreaker;
13     import dk.thoerup.circuitbreaker.CircuitBreakerManager;
14 torben 416
15     public class ViewCircuitBreaker implements Command {
16 torben 417
17     private boolean readOnly;
18    
19     public ViewCircuitBreaker(boolean readOnly) {
20     this.readOnly = readOnly;
21     }
22 torben 416
23 torben 417 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 torben 448 public String getStateBar(CircuitBreaker breaker) {
36 torben 417 StringBuilder sb = new StringBuilder();
37 torben 448 sb.append( breaker.getStateName() );
38 torben 417 sb.append(": <span style=\"background-color: ");
39 torben 448 if ( breaker.isOpen() ) {
40 torben 417 sb.append("red");
41 torben 448 } else if ( breaker.isClosed() ) {
42 torben 417 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 torben 1291 public static String formatDate(long date) {
52 torben 628 if (date == 0L) {
53     return "-";
54     } else {
55     return new Date(date).toString();
56     }
57     }
58    
59 torben 416 public String execute(HttpServletRequest req, HttpServletResponse resp) {
60     CircuitBreaker breaker = CircuitBreakerManager.getManager().getCircuitBreaker( req.getParameter("breaker"));
61 torben 417 String uri = req.getRequestURI();
62 torben 416
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 torben 461 sb.append("<tr><td>State </td><td><b>").append( getStateBar(breaker) ).append("</b></td></tr>\n");
77 torben 416 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 torben 417
84 torben 416 if (breaker instanceof AccountingCircuitBreaker) {
85     AccountingCircuitBreaker acb = (AccountingCircuitBreaker) breaker;
86 torben 1844
87     StringBuilder sbf = new StringBuilder();
88 torben 1846 if (acb.getTotalCallCount() > 0) {
89     double failure_percentage = ((double) acb.getTotalFailureCount()*100) / ((double) acb.getTotalCallCount() );
90     Formatter formatter = new Formatter(sbf);
91     formatter.format("%.2f", failure_percentage);
92 torben 2075 formatter.close();
93 torben 1846 } else {
94     sbf.append("0.0");
95     }
96 torben 1844
97    
98 torben 417 sb.append("<tr><th colspan=\"2\">Accounting</th></tr>\n");
99     sb.append("<tr><td>Trip count</td><td>").append( acb.getTripCount() ).append("</td></tr>\n");
100 torben 864 sb.append("<tr><td>Re-trip count</td><td>").append( acb.getRetripCount() ).append("</td></tr>\n");
101 torben 417 sb.append("<tr><td>Block count</td><td>").append( acb.getBlockCount() ).append("</td></tr>\n");
102     sb.append("<tr><td>Total failure count</td><td>").append( acb.getTotalFailureCount() ).append("</td></tr>\n");
103     sb.append("<tr><td>Total Call count</td><td>").append( acb.getTotalCallCount() ).append("</td></tr>\n");
104 torben 1845 sb.append("<tr><td>Failure Percentage</td><td>").append( sbf.toString() ).append("%</td></tr>\n");
105 torben 628 sb.append("<tr><td>Last failure</td><td>").append( formatDate(acb.getLastFailure()) ).append("</td></tr>\n");
106     sb.append("<tr><td>Last trip</td><td>").append( formatDate(acb.getLastTrip()) ).append("</td></tr>\n");
107 torben 864 sb.append("<tr><td>Last re-trip</td><td>").append( formatDate(acb.getLastRetrip()) ).append("</td></tr>\n");
108 torben 628 sb.append("<tr><td>Last reset</td><td>").append( formatDate(acb.getLastReset()) ).append("</td></tr>\n");
109 torben 624
110 torben 628 sb.append("<tr><td>Last resetCounters</td><td>").append( formatDate(acb.getLastResetCounters()) ).append("</td></tr>\n");
111 torben 416 }
112 torben 1285
113     if (breaker instanceof LoggingCircuitBreaker) {
114     LoggingCircuitBreaker lcb = (LoggingCircuitBreaker) breaker;
115    
116     LinkedList<LoggingCircuitBreaker.LogEntry> list = lcb.getLog();
117 torben 1291 String headerLink = String.format("<a href=\"%s?command=log&breaker=%s\">Logging</a>", req.getRequestURI(), breaker.getName() );
118 torben 1285
119 torben 1291 sb.append("<tr><th colspan=\"2\">").append(headerLink).append("</th></tr>\n");
120    
121     int max = list.size() > 10 ? 10 : list.size();
122     for (int i=0; i<max; i++) {
123     LoggingCircuitBreaker.LogEntry entry = list.get(i);
124 torben 1287 sb.append("<tr><td colspan=\"2\">");
125 torben 1293 sb.append( entry.toString() );
126 torben 1285 sb.append("</td></tr>");
127     }
128     }
129 torben 416
130 torben 698 sb.append("</table>\n");
131     sb.append("Current time: ").append( new Date().toString() ).append("<br><br>\n");
132 torben 416
133 torben 417 sb.append("<b>Operations:</b>\n");
134     if ( !readOnly ) {
135     sb.append( actionBuilder(uri, "reset", breaker.getName())).append("<br>\n");
136     sb.append( actionBuilder(uri, "tripBreaker", breaker.getName())).append("<br>\n");
137     if (breaker instanceof AccountingCircuitBreaker ) {
138     sb.append( actionBuilder(uri, "resetCounters", breaker.getName())).append("<br>\n");
139     }
140 torben 1292 if (breaker instanceof LoggingCircuitBreaker ) {
141     sb.append( actionBuilder(uri, "clearLog", breaker.getName())).append("<br>\n");
142     }
143 torben 417 } else {
144     sb.append("<i>the CircuitBreakers can only be viewed</i>");
145     }
146 torben 416
147     sb.append("</body></html>");
148    
149     return sb.toString();
150     }
151    
152     }
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