zookeeper分布式锁(十一)-优快云博客

本文链接：https://blog.youkuaiyun.com/u014783753/article/details/42874903

本文介绍了一个名为ZNodeName的类，该类用于处理ZooKeeper中节点名称的比较和解析工作。ZNodeName实现了Comparable接口，允许通过前缀和序列号对节点名进行排序。此外，还详细介绍了类中的各种方法，包括构造函数、compareTo方法以及获取节点名称、前缀和序列号的方法。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

ZNodeName：

class ZNodeName implements Comparable<ZNodeName> {
    private final String name;
    private String prefix;
    private int sequence = -1;
    private static final Logger LOG = LoggerFactory.getLogger(ZNodeName.class);
    
    public ZNodeName(String name) {
        if (name == null) {
            throw new NullPointerException("id cannot be null");
        }
        this.name = name;
        this.prefix = name;
        int idx = name.lastIndexOf('-');
        if (idx >= 0) {
            this.prefix = name.substring(0, idx);
            try {
                this.sequence = Integer.parseInt(name.substring(idx + 1));
                // If an exception occurred we misdetected a sequence suffix,
                // so return -1.
            } catch (NumberFormatException e) {
                LOG.info("Number format exception for " + idx, e);
            } catch (ArrayIndexOutOfBoundsException e) {
               LOG.info("Array out of bounds for " + idx, e);
            }
        }
    }

    @Override
    public String toString() {
        return name.toString();
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        ZNodeName sequence = (ZNodeName) o;

        if (!name.equals(sequence.name)) return false;

        return true;
    }

    @Override
    public int hashCode() {
        return name.hashCode() + 37;
    }

    public int compareTo(ZNodeName that) {
        int answer = this.prefix.compareTo(that.prefix);
        if (answer == 0) {
            int s1 = this.sequence;
            int s2 = that.sequence;
            if (s1 == -1 && s2 == -1) {
                return this.name.compareTo(that.name);
            }
            answer = s1 == -1 ? 1 : s2 == -1 ? -1 : s1 - s2;
        }
        return answer;
    }

    /**
     * Returns the name of the znode
     */
    public String getName() {
        return name;
    }

    /**
     * Returns the sequence number
     */
    public int getZNodeName() {
        return sequence;
    }

    /**
     * Returns the text prefix before the sequence number
     */
    public String getPrefix() {
        return prefix;
    }
}