forgot to use commit uniquefifo.go

uniquefifo.go

@@ -0,0 +1,82 @@
+package main
+
+import (
+	"sync"
+)
+
+type UniqueFifo struct {
+    slice []string
+	mu sync.Mutex
+	size int
+}
+
+
+func newUniqueFifo(size int) *UniqueFifo {
+    q := UniqueFifo{}
+    q.slice = make([]string, 0)
+	q.size = size
+    return &q
+}
+
+func (q *UniqueFifo) Add(v string) bool {
+	ret := false
+	if len(q.slice) == 0 {
+		q.slice = append(q.slice, v)
+//logDebug.Print("Condition 1 for ", v)
+		ret = false
+	} else {
+		i := q.Contains(v)
+		if i != -1 {
+			q.Remove(i)
+//logDebug.Print("Condition 2 for ", v)
+			ret = true
+		} else {
+//logDebug.Print("Condition 3 for ", v)
+			ret = false
+		}
+		q.slice = append(q.slice, "")
+		copy(q.slice[1:], q.slice)
+		q.slice[0] = v
+		if len(q.slice) <= q.size {
+			q.slice = q.slice[:len(q.slice)]
+		} else {
+			q.slice = q.slice[:q.size]
+		}
+	}
+
+	return ret
+}
+
+func (q *UniqueFifo) Remove(r int) {
+	f := q.slice[:r]
+	e := q.slice[r+1:]
+	q.slice = f
+	q.slice = append(q.slice, e...)
+}
+
+
+func (q *UniqueFifo) Contains(v string) int {
+	for i, val := range q.slice {
+		if val == v {
+			return i
+		}
+	}
+	return -1
+}
+
+/*
+func main() {
+	u := newUniqueFifo(3)
+	u.Add("First")
+	u.Add("First")
+	fmt.Println(u)
+	u.Add("Second")
+	fmt.Println(u)
+	u.Add("First")
+	fmt.Println(u)
+	u.Add("Third")
+	fmt.Println(u)
+	u.Add("Fourth")
+	fmt.Println(u)
+}
+*/