From e63784b0073a3548432712667fc2a084ceae3f27 Mon Sep 17 00:00:00 2001
From: Pradyumna Kaushik <pkaushi1@binghamton.edu>
Date: Sat, 28 Jan 2017 19:32:54 -0500
Subject: [PATCH] Created utilities/offerUtils that can can hold all the
 utility functions for Offers.

---
 utilities/offerUtils/offerUtils.go | 40 ++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 utilities/offerUtils/offerUtils.go

diff --git a/utilities/offerUtils/offerUtils.go b/utilities/offerUtils/offerUtils.go
new file mode 100644
index 0000000..fc930f9
--- /dev/null
+++ b/utilities/offerUtils/offerUtils.go
@@ -0,0 +1,40 @@
+package offerUtils
+
+import (
+	mesos "github.com/mesos/mesos-go/mesosproto"
+)
+
+func OfferAgg(offer *mesos.Offer) (float64, float64, float64) {
+	var cpus, mem, watts float64
+
+	for _, resource := range offer.Resources {
+		switch resource.GetName() {
+		case "cpus":
+			cpus += *resource.GetScalar().Value
+		case "mem":
+			mem += *resource.GetScalar().Value
+		case "watts":
+			watts += *resource.GetScalar().Value
+		}
+	}
+
+	return cpus, mem, watts
+}
+
+type OffersSorter []*mesos.Offer
+
+func (offersSorter OffersSorter) Len() int {
+	return len(offersSorter)
+}
+
+func (offersSorter OffersSorter) Swap(i, j int) {
+	offersSorter[i], offersSorter[j] = offersSorter[j], offersSorter[i]
+}
+
+func (offersSorter OffersSorter) Less(i, j int) bool {
+	// getting CPU resource availability of offersSorter[i]
+	cpu1, _, _ := OfferAgg(offersSorter[i])
+	// getting CPU resource availability of offersSorter[j]
+	cpu2, _, _ := OfferAgg(offersSorter[j])
+	return cpu1 <= cpu2
+}