Hook impl

ringbuffer/ringbuffer.go

@@ -0,0 +1,70 @@
+package ringbuffer
+
+import (
+	"sync"
+)
+
+
+type RingBuffer struct {
+	buffer []string
+	size   int
+	head   int
+	tail   int
+	mu     sync.Mutex
+}
+
+
+func NewRingBuffer(size int) *RingBuffer {
+	return &RingBuffer{
+		buffer: make([]string, size),
+		size:   size,
+		head:   -1,
+		tail:   -1,
+	}
+}
+
+
+func (rb *RingBuffer) Add(item string) {
+	rb.mu.Lock()
+	defer rb.mu.Unlock()
+
+	if (rb.tail+1)%rb.size == rb.head {
+		rb.head = (rb.head + 1) % rb.size
+	}
+
+	rb.tail = (rb.tail + 1) % rb.size
+	rb.buffer[rb.tail] = item
+
+	if rb.head == -1 {
+		rb.head = rb.tail
+	}
+}
+
+
+func (rb *RingBuffer) GetLast() (string, int) {
+	rb.mu.Lock()
+	defer rb.mu.Unlock()
+
+	if rb.head == -1 {
+		return "", -1
+	}
+
+	return rb.buffer[rb.tail], rb.tail
+}
+
+
+func (rb *RingBuffer) WaitForNewItem() string {
+	var newItem string
+
+	for {
+		rb.mu.Lock()
+		if rb.head != -1 && rb.tail != -1 && rb.buffer[rb.tail] != newItem {
+			newItem = rb.buffer[rb.tail]
+			rb.mu.Unlock()
+			break
+		}
+		rb.mu.Unlock()
+	}
+	return newItem
+}
+