chainer for MSP requests

js/msp/MSPchainer.js

@@ -0,0 +1,35 @@
+/*global $*/
+'use strict';
+
+var MSPChainerClass = function () {
+
+    var self = {};
+
+    self.chain = [];
+    self.exitPoint = null;
+    self.chainIndex = 0;
+
+    self.setChain = function(chain) {
+        self.chain = chain;
+    };
+
+    self.setExitPoint = function (exitPoint) {
+        self.exitPoint = exitPoint;
+    };
+
+    self.returnCallback = function () {
+        self.chainIndex++;
+        if (self.chain[self.chainIndex]) {
+            self.chain[self.chainIndex](self.returnCallback);
+        } else {
+            self.exitPoint();
+        }
+    };
+
+    self.execute = function() {
+        self.chainIndex = 0;
+        self.chain[self.chainIndex](self.returnCallback);
+    };
+
+    return self;
+};