first commit

batch/scheduler/capacity/http-load.js

@@ -0,0 +1,32 @@
+'use strict';
+
+var util = require('util');
+var debug = require('../../util/debug')('capacity-http-load');
+var HttpSimpleCapacity = require('./http-simple');
+
+function HttpLoadCapacity(host, capacityEndpoint) {
+    HttpSimpleCapacity.call(this, host, capacityEndpoint);
+}
+util.inherits(HttpLoadCapacity, HttpSimpleCapacity);
+
+module.exports = HttpLoadCapacity;
+
+HttpLoadCapacity.prototype.getCapacity = function(callback) {
+    this.getResponse(function(err, values) {
+        var capacity = 1;
+
+        if (err) {
+            return callback(null, capacity);
+        }
+
+        var cores = parseInt(values.cores, 10);
+        var relativeLoad = parseFloat(values.relative_load);
+
+        capacity = Math.max(1, Math.floor(((1 - relativeLoad) * cores) - 1));
+
+        capacity = Number.isFinite(capacity) ? capacity : 1;
+
+        debug('host=%s, capacity=%s', this.host, capacity);
+        return callback(null, capacity);
+    }.bind(this));
+};