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package io.joshworks.snappy.extensions.dashboard;
import java.util.Collection;
import java.util.concurrent.ConcurrentLinkedQueue;
/**
* Created by Josh Gontijo on 5/14/17.
*/
public class RingBuffer extends ConcurrentLinkedQueue {
private int pos = 0;
private final int size;
private RingBuffer(int size) {
if (size <= 0) {
throw new IllegalArgumentException("Size must be greater than greater than zero");
}
this.size = size;
}
public static RingBuffer ofSize(int size) {
return new RingBuffer<>(size);
}
private void checkPosInsert() {
if (pos++ >= size) {
poll();
pos = size;
}
}
private void checkPosRemove() {
if (pos > 0) {
pos--;
}
}
@Override
public boolean offer(T t) {
checkPosInsert();
return super.offer(t);
}
@Override
public T poll() {
T poll = super.poll();
checkPosRemove();
return poll;
}
@Override
public T peek() {
T peek = super.peek();
checkPosRemove();
return peek;
}
@Override
public void clear() {
pos = 0;
super.clear();
}
@Override
public boolean remove(Object o) {
boolean remove = super.remove(o);
checkPosRemove();
return remove;
}
@Override
public T remove() {
T remove = super.remove();
checkPosRemove();
return remove;
}
@Override
public boolean containsAll(Collection c) {
throw new UnsupportedOperationException("Not supported");
}
@Override
public boolean removeAll(Collection c) {
throw new UnsupportedOperationException("Not supported");
}
@Override
public boolean retainAll(Collection c) {
throw new UnsupportedOperationException("Not supported");
}
}