package dk.thoerup.circuitbreaker.web; import java.util.Date; import java.util.Formatter; import java.util.LinkedList; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import dk.thoerup.circuitbreaker.CircuitBreaker; import dk.thoerup.circuitbreaker.CircuitBreakerManager; import dk.thoerup.circuitbreaker.statistics.AccountingStatistics; import dk.thoerup.circuitbreaker.statistics.LoggingStatistics; import dk.thoerup.circuitbreaker.statistics.Statistics; public class ViewCircuitBreaker implements Command { private boolean readOnly; public ViewCircuitBreaker(boolean readOnly) { this.readOnly = readOnly; } private String actionBuilder(String uri, String action, String breaker) { StringBuilder sb = new StringBuilder(); sb.append("
"); sb.append("\n"); sb.append("\n"); sb.append("\n"); sb.append("\n"); sb.append("
"); return sb.toString(); } public String getStateBar(CircuitBreaker breaker) { StringBuilder sb = new StringBuilder(); sb.append( breaker.getStateName() ); sb.append(":    "); return sb.toString(); } public static String formatDate(long date) { if (date == 0L) { return "-"; } else { return new Date(date).toString(); } } public String execute(HttpServletRequest req, HttpServletResponse resp) { CircuitBreaker breaker = CircuitBreakerManager.getManager().getCircuitBreaker( req.getParameter("breaker")); String uri = req.getRequestURI(); if (breaker == null) return "

No breaker named '" + req.getParameter("breaker") + "'

"; Statistics stats = breaker.getStatistics(); StringBuilder sb = new StringBuilder(); sb.append("View Circuitbreaker"); sb.append("<<== Back to overview

"); sb.append("

CircuitBreaker

\n"); sb.append("Attributes:\n"); sb.append(""); sb.append("\n"); sb.append("\n"); sb.append("\n"); sb.append("\n"); sb.append("\n"); sb.append("\n"); sb.append("\n"); sb.append("\n"); sb.append("\n"); if (stats instanceof AccountingStatistics) { AccountingStatistics ac = (AccountingStatistics) stats; StringBuilder sbf = new StringBuilder(); if (ac.getTotalCallCount() > 0) { double failure_percentage = ((double) ac.getTotalFailureCount()*100) / ((double) ac.getTotalCallCount() ); Formatter formatter = new Formatter(sbf); formatter.format("%.2f", failure_percentage); formatter.close(); } else { sbf.append("0.0"); } sb.append("\n"); sb.append("\n"); sb.append("\n"); sb.append("\n"); sb.append("\n"); sb.append("\n"); sb.append("\n"); sb.append("\n"); sb.append("\n"); sb.append("\n"); sb.append("\n"); sb.append("\n"); } if (stats instanceof LoggingStatistics) { LoggingStatistics ls = (LoggingStatistics) stats; LinkedList list = ls.getLog(); String headerLink = String.format("Logging", req.getRequestURI(), breaker.getName() ); sb.append("\n"); int max = list.size() > 10 ? 10 : list.size(); for (int i=0; i"); } } sb.append("
Name ").append(breaker.getName()).append("
State ").append( getStateBar(breaker) ).append("
Type ").append(breaker.getClass().getSimpleName() ).append("
Notifier ").append(breaker.getNotifierName()).append("
Statistics ").append( stats.getClass().getSimpleName() ).append("
Failure count ").append(breaker.getFailureCount()).append("
Failure threshold ").append(breaker.getThreshold()).append("
Timeout, elapsed").append( breaker.getElapsed() ).append("
Timeout, limit").append( breaker.getTimeout() ).append("
Accounting
Trip count").append( ac.getTripCount() ).append("
Re-trip count").append( ac.getRetripCount() ).append("
Block count").append( ac.getBlockCount() ).append("
Total failure count").append( ac.getTotalFailureCount() ).append("
Total Call count").append( ac.getTotalCallCount() ).append("
Failure Percentage").append( sbf.toString() ).append("%
Last failure").append( formatDate(ac.getLastFailure()) ).append("
Last trip").append( formatDate(ac.getLastTrip()) ).append("
Last re-trip").append( formatDate(ac.getLastRetrip()) ).append("
Last reset").append( formatDate(ac.getLastReset()) ).append("
Last resetCounters").append( formatDate(ac.getLastResetCounters()) ).append("
").append(headerLink).append("
"); sb.append( entry.toString() ); sb.append("
\n"); sb.append("Current time: ").append( new Date().toString() ).append("

\n"); sb.append("Operations:\n"); if ( !readOnly ) { sb.append( actionBuilder(uri, "reset", breaker.getName())).append("
\n"); sb.append( actionBuilder(uri, "tripBreaker", breaker.getName())).append("
\n"); if (stats instanceof AccountingStatistics ) { sb.append( actionBuilder(uri, "resetCounters", breaker.getName())).append("
\n"); } if (stats instanceof LoggingStatistics ) { sb.append( actionBuilder(uri, "clearLog", breaker.getName())).append("
\n"); } } else { sb.append("the CircuitBreakers can only be viewed"); } sb.append(""); return sb.toString(); } }