KLALB2.3

src/org/kne/cloud/network/klalb/ReceiveSlidingWindow.java

@@ -0,0 +1,45 @@
+package org.kne.cloud.network.klalb;
+
+import java.util.Objects;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.atomic.AtomicLong;
+import java.util.concurrent.atomic.AtomicReferenceArray;
+
+public class ReceiveSlidingWindow<E> {
+	private AtomicReferenceArray<E> array;
+	private AtomicInteger windowSize =new AtomicInteger();
+	private AtomicLong windowPosition=new AtomicLong();
+	
+	public int getWindowSize() {
+		return windowSize.get();
+	}
+
+	public void setWindowSize(int windowSize) {
+		this.windowSize.set(windowSize);
+	}
+	
+	public long getWindowPosition() {
+		return windowPosition.get();
+	}
+
+	public void setWindowPosition(long windowPosition) {
+		this.windowPosition.set(windowPosition);
+	}
+
+	public ReceiveSlidingWindow(int capacity){
+		array=new AtomicReferenceArray<E>(capacity);
+	}
+	
+	public boolean push(E object) {
+		Objects.requireNonNull(object);
+		if(array.get((int) ((windowPosition.get()-windowSize.get())%array.length()))==null ) {
+			array.set((int) (windowPosition.getAndIncrement()%array.length()), object);
+			return true;
+		}
+		return false;
+	}
+
+	public E pull(long number) {
+		return array.getAndSet((int) (number%array.length()), null);
+	}
+}