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                ![](https://img.kancloud.cn/dc/b7/dcb7cbdac9d6ba0f8944a2868484cab1_1136x444.png) 1. 監聽原理詳解: (1)首先要有一個 main()線程。 (2)在 main 線程中創建 Zookeeper 客戶端,這時就會創建兩個線程,一個負責網絡連接通信(connet),一個負責監聽(listener)。 (3)通過 connect 線程將注冊的監聽事件發送給 Zookeeper。 (4)在 Zookeeper 的注冊監聽器列表中將注冊的監聽事件添加到列表中。 (5)Zookeeper 監聽到有數據或路徑變化,就會將這個消息發送給 listener線程。 (6)listener 線程內部調用了 process()方法。 2. 常見的監聽 (1)監聽節點數據的變化: ``` get path [watch] ``` (2)監聽子節點增減的變化 ``` ls path [watch] ```
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