sequential segment requests (Async.js queue) instead of firing all at once,

fixes terminated requests when number of segments > maxthreads

.gitignore

@@ -3,5 +3,9 @@ bower_components/leaflet-routing/examples/
 bower_components/Leaflet.Elevation/*
 !bower_components/Leaflet.Elevation/dist/
 !bower_components/Leaflet.Elevation/src/
+bower_components/async/*
+!bower_components/async/lib/
+!bower_components/async/README.md
+!bower_components/async/LICENSE
 nbproject/
 .idea/

README.md

@@ -59,3 +59,5 @@ Copyright (c) 2013 Stefano Cudini; [MIT License](https://github.com/stefanocudin
 Copyright (c) 2011-2012, Pavel Shramov; [2-clause BSD License](https://github.com/shramov/leaflet-plugins/blob/master/LICENSE)
 * [normalize.css](https://github.com/necolas/normalize.css)  
 Copyright (c) Nicolas Gallagher and Jonathan Neal; [MIT License](https://github.com/necolas/normalize.css/blob/master/LICENSE.md)
+* [Async.js](https://github.com/caolan/async)  
+Copyright (c) 2010-2014 Caolan McMahon; [MIT License](https://github.com/caolan/async/blob/master/LICENSE)

bower.json

@@ -12,6 +12,7 @@
     "leaflet-search": "*",
     "leaflet-plugins": "*",
     "leaflet-routing": "Turistforeningen/leaflet-routing#gh-pages",
-    "Leaflet.Elevation": "MrMufflon/Leaflet.Elevation#master"
+    "Leaflet.Elevation": "MrMufflon/Leaflet.Elevation#master",
+    "async": "*"
   }
 }

bower_components/async/LICENSE

@@ -0,0 +1,19 @@
+Copyright (c) 2010-2014 Caolan McMahon
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

index.html

@@ -79,6 +79,7 @@
     <!--<script src="http://d3js.org/d3.v3.min.js"></script>-->
     <script src="http://cdnjs.cloudflare.com/ajax/libs/d3/3.4.1/d3.min.js"></script>
     <script src="bower_components/Leaflet.Elevation/src/L.Control.Elevation.js"></script>
+    <script src="bower_components/async/lib/async.js"></script>
 
     <script>
         // global package prefix for BRouter web application

js/router/BRouter.js

@@ -14,6 +14,10 @@ L.BRouter = L.Class.extend({
 
     initialize: function (options) {
         L.setOptions(this, options);
+
+        this.queue = async.queue(L.bind(function (task, callback) {
+            this.getRoute(task.segment, callback);
+        }, this), 1);
     },
 
     setOptions: function(options) {
@@ -108,7 +112,7 @@ L.BRouter = L.Class.extend({
     },
 
     getRouteSegment: function(l1, l2, cb) {
-        return this.getRoute([l1, l2], cb);
+        this.queue.push({ segment: [l1, l2] }, cb);
     },
 
     uploadProfile: function(profileId, profileText, cb) {