[activemq58] Proper prefix on service check

I hacked the StatsDReporter to send the status of activemq.can_connect
instead of activemq_58.can_connect.

It's a bit better than a simple Hack. We decided that the prefix name
shouldn't contain any number, underscore or capital letter (should we
add the dash to this list ?). This way we can have version dependant
configuration in the .yaml config files for JMXFetch without having
multiple and dirty metrics and service check names in the HQ.

src/main/java/org/datadog/jmxfetch/reporter/StatsdReporter.java

@@ -28,7 +28,7 @@ protected void sendMetricPoint(String metricName, double value, String[] tags) {
             this.statsDClient.stop();
             init();
         }
-        statsDClient.gauge(metricName, value, tags);
+        statsDClient.gauge(StatsdReporter.formatDataName(metricName), value, tags);
     }
 
     private int statusToInt(String status) {
@@ -50,11 +50,29 @@ public void sendServiceCheck(String checkName, String status, String message,
             init();
         }
 
-        ServiceCheck sc = new ServiceCheck(String.format("%s.can_connect", checkName),
-            this.statusToInt(status), message, hostname, tags);
+        //ActiveMQ > 5.8 hack
+        String dataName = StatsdReporter.formatDataName(String.format("%s.can_connect", checkName));
+        ServiceCheck sc = new ServiceCheck(dataName, this.statusToInt(status), message, hostname, tags);
+
         statsDClient.serviceCheck(sc);
     }
 
+    public static String formatDataName(String name){
+        String[] chunks = name.split("\\.");
+
+        // Escaping the prefix name 
+        chunks[0] = chunks[0].replaceAll("[_A-Z0-9:-]", "");
+
+        // Putting the chunks together (there's nothing in the standard library to do that :o )
+        String res = "";
+        for(int i = 0; i < chunks.length; ++i){
+            if(i > 0)
+                res += ".";
+            res += chunks[i];
+        }
+        return res;
+    }
+
     public void displayMetricReached() {
         throw new UnsupportedOperationException();
     }