1 files changed, 39 insertions, 0 deletions

diff --git a/js/RrdDataFile.js b/js/RrdDataFile.js
index e3e74e6..4ebb220 100644
--- a/js/RrdDataFile.js
+++ b/js/RrdDataFile.js
@@ -34,6 +34,8 @@ RrdDataFile.prototype = {
         init: function()
         {
                 this.rrdfiles = {};
+                this.rrdfiles_fetching = {};
+                this.rrdfiles_wait = {};
         },
         build: function(gdp, ft_step, rrd)
         {
@@ -130,5 +132,42 @@ RrdDataFile.prototype = {
                 }
 
                 return this.build(gdp, ft_step, rrd);
+        },
+        fetch_async_callback: function(bf, args)
+        {
+                var rrd;
+
+                rrd = new RRDFile(bf);
+                args.this.rrdfiles[args.gdp.rrd] = rrd;
+                args.callback(args.callback_arg, args.this.build(args.gdp, args.ft_step, rrd));
+
+                for(var vname in args.this.rrdfiles_wait)
+                {
+                        var o_args = args.this.rrdfiles_wait[vname];
+                        if (args.gdp.rrd == o_args.gdp.rrd)
+                        {
+                                delete args.this.rrdfiles_wait[vname];
+                                o_args.callback(o_args.callback_arg, args.this.build(o_args.gdp, o_args.ft_step, rrd));
+                        }
+                }
+        },
+        fetch_async: function(gdp, ft_step, callback, callback_arg)
+        {
+                var rrd;
+                if (gdp.rrd == null) return -1;
+
+                if (gdp.rrd in this.rrdfiles) {
+                        callback(callback_arg, this.build(gdp, ft_step, this.rrdfiles[gdp.rrd]));
+                } else if (gdp.rrd in this.rrdfiles_fetching) {
+                        this.rrdfiles_wait[gdp.vname] = { this:this, gdp: gdp, ft_step: ft_step, callback: callback, callback_arg: callback_arg };
+                        if (gdp.rrd in this.rrdfiles)
+                        {
+                                delete this.rrdfiles_wait[gdp.vname];
+                                callback(callback_arg, this.build(gdp, ft_step, this.rrdfiles[gdp.rrd]));
+                        }
+                } else {
+                        this.rrdfiles_fetching[gdp.rrd] = FetchBinaryURLAsync(gdp.rrd, this.fetch_async_callback, { this:this, gdp: gdp, ft_step: ft_step, callback: callback, callback_arg: callback_arg });
+                }
+                return 0;
         }
 };