public Integer peek() {
	    int i = peekInt();
        if(i == Integer.MIN_VALUE) {
            return null;
        }
        return i;
    }
This is to be used for an IPC queue with the direct buffer used being a memory
mapped file.

@param buff
@param capacity
@param viewMask
jctools-experimental/src/main/java/org/jctools/queues/SpscOffHeapIntQueue.java