【Curator NodeCache 源码解析】

NodeCache

1. NodeCache在new对象时候会调用client.newWatcherRemoveCuratorFramework去新建一个监听客户端。

  /**
     * @param client curztor client
     * @param path the full path to the node to cache
     * @param dataIsCompressed if true, data in the path is compressed
     */
    public NodeCache(CuratorFramework client, String path, boolean dataIsCompressed)
    {
   
        this.client = client.newWatcherRemoveCuratorFramework();
        this.path = PathUtils.validatePath(path);
        this.dataIsCompressed = dataIsCompressed;
    }

2. start() 启动缓存服务

 public void     start(boolean buildInitial) throws Exception
    {
   
      //设值启动状态
       Preconditions.checkState(state.compareAndSet(State.LATENT,              State.STARTED), "Cannot be started more than once");

      //增加连接状态监听 client.getConnectionStateListenable().addListener(connectionStateListener);
    // 进行初始化操作
        if ( buildInitial )
        {
   
            client.checkExists().creatingParentContainersIfNeeded().forPath(path);
            internalRebuild();
        }
        reset();
    }

    // 判断是否是启动连接状态，判断节点是否存在
   private void     reset() throws Exception
    {
   
        if ( (state.get