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package dk.thoerup.circuitbreaker.web; |
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import java.util.Date; |
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import java.util.Formatter; |
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import java.util.LinkedList; |
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import javax.servlet.http.HttpServletRequest; |
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import javax.servlet.http.HttpServletResponse; |
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import dk.thoerup.circuitbreaker.CircuitBreaker; |
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import dk.thoerup.circuitbreaker.CircuitBreakerManager; |
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import dk.thoerup.circuitbreaker.statistics.AccountingStatistics; |
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import dk.thoerup.circuitbreaker.statistics.LoggingStatistics; |
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import dk.thoerup.circuitbreaker.statistics.Statistics; |
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public class ViewCircuitBreaker implements Command { |
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private boolean readOnly; |
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public ViewCircuitBreaker(boolean readOnly) { |
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this.readOnly = readOnly; |
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} |
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private String actionBuilder(String uri, String action, String breaker) { |
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StringBuilder sb = new StringBuilder(); |
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sb.append("<form action=\"").append(uri).append("\" method=\"post\">"); |
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sb.append("<input type=\"hidden\" name=\"command\" value=\"action\">\n"); |
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sb.append("<input type=\"hidden\" name=\"breaker\" value=\"").append(breaker).append("\">\n"); |
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sb.append("<input type=\"hidden\" name=\"action\" value=\"").append(action).append("\">\n"); |
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sb.append("<input type=\"submit\" value=\"").append(action).append("\">\n"); |
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sb.append("</form>"); |
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return sb.toString(); |
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} |
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public String getStateBar(CircuitBreaker<?> breaker) { |
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StringBuilder sb = new StringBuilder(); |
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sb.append( breaker.getStateName() ); |
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sb.append(": <span style=\"background-color: "); |
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if ( breaker.isOpen() ) { |
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sb.append("red"); |
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} else if ( breaker.isClosed() ) { |
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sb.append("green"); |
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} else { |
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sb.append("yellow"); |
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} |
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sb.append("\"> <span>"); |
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return sb.toString(); |
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} |
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public static String formatDate(long date) { |
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if (date == 0L) { |
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return "-"; |
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} else { |
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return new Date(date).toString(); |
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} |
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} |
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public String execute(HttpServletRequest req, HttpServletResponse resp) { |
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CircuitBreaker<?> breaker = CircuitBreakerManager.getManager().getCircuitBreaker( req.getParameter("breaker")); |
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String uri = req.getRequestURI(); |
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if (breaker == null) |
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return "<html><body><h2>No breaker named '" + req.getParameter("breaker") + "'</h2></body></html>"; |
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|
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Statistics stats = breaker.getStatistics(); |
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StringBuilder sb = new StringBuilder(); |
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sb.append("<html><head><title>View Circuitbreaker</title></head><body>"); |
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sb.append("<<== <a href=\"").append(req.getRequestURI()).append("\">Back to overview</a><br><br>"); |
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sb.append("<h2>CircuitBreaker</h2>\n"); |
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sb.append("<b>Attributes:</b>\n"); |
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sb.append("<table border=\"1\" cellspacing=0>"); |
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sb.append("<tr><td>Name </td><td>").append(breaker.getName()).append("</td></tr>\n"); |
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sb.append("<tr><td>State </td><td><b>").append( getStateBar(breaker) ).append("</b></td></tr>\n"); |
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sb.append("<tr><td>Type </td><td>").append(breaker.getClass().getSimpleName() ).append("</td></tr>\n"); |
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sb.append("<tr><td>Notifier </td><td>").append(breaker.getNotifierName()).append("</td></tr>\n"); |
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sb.append("<tr><td>Statistics </td><td>").append( stats.getClass().getSimpleName() ).append("</td></tr>\n"); |
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sb.append("<tr><td>Failure count </td><td>").append(breaker.getFailureCount()).append("</td></tr>\n"); |
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sb.append("<tr><td>Failure threshold </td><td>").append(breaker.getThreshold()).append("</td></tr>\n"); |
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sb.append("<tr><td>Timeout, elapsed</td><td>").append( breaker.getElapsed() ).append("</td></tr>\n"); |
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sb.append("<tr><td>Timeout, limit</td><td>").append( breaker.getTimeout() ).append("</td></tr>\n"); |
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if (stats instanceof AccountingStatistics) { |
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AccountingStatistics ac = (AccountingStatistics) stats; |
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StringBuilder sbf = new StringBuilder(); |
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if (ac.getTotalCallCount() > 0) { |
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double failure_percentage = ((double) ac.getTotalFailureCount()*100) / ((double) ac.getTotalCallCount() ); |
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Formatter formatter = new Formatter(sbf); |
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formatter.format("%.2f", failure_percentage); |
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formatter.close(); |
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} else { |
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sbf.append("0.0"); |
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} |
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sb.append("<tr><th colspan=\"2\">Accounting</th></tr>\n"); |
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sb.append("<tr><td>Trip count</td><td>").append( ac.getTripCount() ).append("</td></tr>\n"); |
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sb.append("<tr><td>Re-trip count</td><td>").append( ac.getRetripCount() ).append("</td></tr>\n"); |
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sb.append("<tr><td>Block count</td><td>").append( ac.getBlockCount() ).append("</td></tr>\n"); |
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sb.append("<tr><td>Total failure count</td><td>").append( ac.getTotalFailureCount() ).append("</td></tr>\n"); |
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sb.append("<tr><td>Total Call count</td><td>").append( ac.getTotalCallCount() ).append("</td></tr>\n"); |
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sb.append("<tr><td>Failure Percentage</td><td>").append( sbf.toString() ).append("%</td></tr>\n"); |
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sb.append("<tr><td>Last failure</td><td>").append( formatDate(ac.getLastFailure()) ).append("</td></tr>\n"); |
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sb.append("<tr><td>Last trip</td><td>").append( formatDate(ac.getLastTrip()) ).append("</td></tr>\n"); |
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sb.append("<tr><td>Last re-trip</td><td>").append( formatDate(ac.getLastRetrip()) ).append("</td></tr>\n"); |
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sb.append("<tr><td>Last reset</td><td>").append( formatDate(ac.getLastReset()) ).append("</td></tr>\n"); |
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sb.append("<tr><td>Last resetCounters</td><td>").append( formatDate(ac.getLastResetCounters()) ).append("</td></tr>\n"); |
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} |
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if (stats instanceof LoggingStatistics) { |
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LoggingStatistics ls = (LoggingStatistics) stats; |
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LinkedList<LoggingStatistics.LogEntry> list = ls.getLog(); |
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String headerLink = String.format("<a href=\"%s?command=log&breaker=%s\">Logging</a>", req.getRequestURI(), breaker.getName() ); |
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sb.append("<tr><th colspan=\"2\">").append(headerLink).append("</th></tr>\n"); |
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int max = list.size() > 10 ? 10 : list.size(); |
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for (int i=0; i<max; i++) { |
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LoggingStatistics.LogEntry entry = list.get(i); |
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sb.append("<tr><td colspan=\"2\">"); |
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sb.append( entry.toString() ); |
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sb.append("</td></tr>"); |
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} |
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} |
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sb.append("</table>\n"); |
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sb.append("Current time: ").append( new Date().toString() ).append("<br><br>\n"); |
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sb.append("<b>Operations:</b>\n"); |
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if ( !readOnly ) { |
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sb.append( actionBuilder(uri, "reset", breaker.getName())).append("<br>\n"); |
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sb.append( actionBuilder(uri, "tripBreaker", breaker.getName())).append("<br>\n"); |
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if (stats instanceof AccountingStatistics ) { |
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sb.append( actionBuilder(uri, "resetCounters", breaker.getName())).append("<br>\n"); |
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} |
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if (stats instanceof LoggingStatistics ) { |
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sb.append( actionBuilder(uri, "clearLog", breaker.getName())).append("<br>\n"); |
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} |
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} else { |
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sb.append("<i>the CircuitBreakers can only be viewed</i>"); |
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} |
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sb.append("</body></html>"); |
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return sb.toString(); |
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} |
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} |
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