heapmemory_alert.groovy

import net.bull.javamelody.*;
import net.bull.javamelody.internal.model.*;

url = "http://myserver:8080/mywebapp/monitoring";
double cpu = new RemoteCall(url).collectGraphLastValue("cpu");
println "cpu = " + cpu;
double gc = new RemoteCall(url).collectGraphLastValue("gc");
println "gc = " + gc;

java = new RemoteCall(url).collectJavaInformations();
memory = java.memoryInformations;
println "used memory = " + Math.round(memory.usedMemory / 1024 / 1024) + " Mb";
println "active HTTP threads count = " + java.activeThreadCount;
println "system load average = " + java.systemLoadAverage;

threads = java.getThreadInformationsList();
deadlocked = new java.util.ArrayList();
for (thread in threads) {
  if (thread.deadlocked)
    deadlocked.add(thread);
}
println deadlocked.size() + " deadlocked threads / " + threads.size() + " threads";
for (thread in deadlocked) {
  println "";
  println thread;
  for (s in thread.getStackTrace())
    println "    " + s;
}

if (gc > 20) throw new Exception("Alert for mywebapp: gc is " + gc);
if (java.systemLoadAverage > 50) throw new Exception("Alert for mywebapp: systemLoadAverage is " + java.systemLoadAverage);
if (java.activeThreadCount > 100) throw new Exception("Alert for mywebapp: activeThreadCount is " + java.activeThreadCount);
if (deadlocked.size() > 0) throw new Exception("Alert for mywebapp: " + deadlocked.size() + " deadlocked threads");