有界缓存兑现基类

有界缓存实现基类
public abstract class BaseBoundedBuffer<V>
{
    private final V[] buf;
   
    private int tail;
   
    private int head;
   
    private int count;
   
    @SuppressWarnings("unchecked")
    protected BaseBoundedBuffer(int capacity)
    {
        this.buf = (V[])new Object[capacity];
    }
   
    protected synchronized final void doPut(V v)
    {
        buf[tail] = v;
       
        if (++tail == buf.length)
        {
            tail = 0;
        }
       
        ++count;
    }
   
    protected synchronized final V doTake()
    {
        V v = buf[head];
       
        buf[head] = null;
       
        if (++head == buf.length)
        {
            head = 0;
        }
       
        --count;
       
        return v;
    }
   
    public synchronized final boolean isFull()
    {
        return count == buf.length;
    }
   
    public synchronized final boolean isEmpty()
    {
        return count == 0;
    }
}