shz.core.queue.l.ConcurrentLinkedQueue Maven / Gradle / Ivy

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There is a newer version: 2024.0.2

package shz.core.queue.l;

import shz.core.lock.ReadWriteLockHolder;
import shz.core.node.SNode;

import java.io.Serializable;
import java.util.NoSuchElementException;

/**
 * 基于链表的队列
 */
public abstract class ConcurrentLinkedQueue> extends ReadWriteLockHolder implements Serializable {
    private static final long serialVersionUID = 4223481645384749598L;
    protected T tail, head;
    protected int size;

    public final int size() {
        readLock.lock();
        try {
            return size;
        } finally {
            readLock.unlock();
        }
    }

    public final boolean isEmpty() {
        readLock.lock();
        try {
            return head == null;
        } finally {
            readLock.unlock();
        }
    }

    public final void clear() {
        writeLock.lock();
        try {
            tail = head = null;
            size = 0;
        } finally {
            writeLock.unlock();
        }
    }

    protected final void checkEmpty() {
        if (head == null) throw new NoSuchElementException();
    }
}