Attempt to generate random metrics from the service. THIS IS BROKEN.

src/main/scala/stella/StellaServlet.scala

@@ -20,7 +20,10 @@ class StellaServlet extends StellaByStarlightStack with JacksonJsonSupport {
   }
 
   get("/api/metrics") {
-    MetricData.generate
+    // Rewrite this to take the start, stop, step parameters and pass
+    // them to the Scala version of the random number generator?
+    MetricData.generate(params("start").toDouble, params("stop").toDouble,
+      params("step").toDouble)
   }
 
 }
@@ -36,8 +39,23 @@ object MetricData {
     Metric("456", DateTime.now.toString())
   )
 
-  def generate = {
-    1 to 1000 map { i => Metric(i.toString(), DateTime.now.toString()) }
+  def generate(start: Double, stop: Double, step: Double) = {
+    var last: Double = start 
+    var value: Double = 0.0
+    var values: List[Double] = List()
+    var i: Int = 0
+
+    while (last < stop) {
+      last += step
+      i += 2
+      value = Math.max(-10.0,
+        Math.min(10.0, value + 0.8 * Math.random - 0.4 + 0.2 * Math.cos(i)))
+      value :: values
+    }
+
+    values.slice(((start - stop) / step).toInt, values.length).map { v: Double =>
+      Metric(v.toString(), DateTime.now.toString())
+    }
   }
 
 }

src/main/webapp/js/stella.js

@@ -1,5 +1,28 @@
 jQuery(function() {
+
   var stellaMetric = function(name) {
+    host = "http://localhost:8080"
+    return context.metric(function(start, stop, step, callback) {
+      path = "/api/metrics"
+        + "?start=" + d3.time.format.iso(start)
+        + "&stop=" + d3.time.format.iso(stop)
+        + "&step" + step;
+      d3.json(host + path,
+        function(data) {
+          if (!data) {
+            return callback(new Error("whups!"));
+          }
+
+          console.log(data);
+          values = data.map(function(d) { return d.value; });
+          // values = data.map(function(d) { return d.value }).slice((start - stop) / step);
+          callback(null, values);
+          console.log("stella", values);
+        });
+    }, name += "");
+  };
+
+  var randomMetric = function(name) {
     var value  = 0,
         values = [],
         i      = 0,
@@ -24,8 +47,10 @@ jQuery(function() {
       .step(1e3)
       .size(700);
 
-  var foo = stellaMetric("foo"),
-      bar = stellaMetric("bar");
+  // var foo = randomMetric("foo"),
+  //     bar = randomMetric("bar");
+  var foo = randomMetric("random"),
+      bar = stellaMetric("stella");
 
   d3.select("#graph").call(function(div) {
     div.append("div")