copy UpdateQueue.js from manager to manager5

www/manager5/data/UpdateQueue.js

@@ -0,0 +1,57 @@
+// Serialize load (avoid too many parallel connections)
+Ext.define('PVE.data.UpdateQueue', {
+    singleton: true,
+
+    constructor : function(){
+        var me = this;
+
+	var queue = [];
+	var queue_idx = {};
+
+	var idle = true;
+
+	var start_update = function() {
+	    if (!idle) {
+		return;
+	    }
+
+	    var storeid = queue.shift();
+	    if (!storeid) {
+		return;
+	    }
+	    var info = queue_idx[storeid];
+	    queue_idx[storeid] = null;
+
+	    info.updatestart = new Date();
+
+	    idle = false;
+	    info.store.load({
+		callback: function(records, operation, success) {
+		    idle = true;
+		    if (info.callback) {
+			var runtime = (new Date()).getTime() - info.updatestart.getTime();
+			info.callback(runtime, success);
+		    }
+		    start_update();
+		}
+	    });
+	};
+
+	Ext.apply(me, {
+	    queue: function(store, cb) {
+		var storeid = store.storeid;
+		if (!storeid) {
+		    throw "unable to queue store without storeid";
+		}
+		if (!queue_idx[storeid]) {
+		    queue_idx[storeid] = {
+			store: store,
+			callback: cb
+		    };
+		    queue.push(storeid);
+		}
+		start_update();
+	    }
+	});
+    }
+});