/**
* 监听某个节点下的直接一级节点 孩子节点的创建，删除，更新
*
* @throws Exception
*/
@Test
public void testWatcherPath() throws Exception {
// 2.Register watcher
PathChildrenCache watcher =
new PathChildrenCache(
client, ZK_PATH, true // if cache data
);
watcher
.getListenable()
.addListener(
new PathChildrenCacheListener() {
@Override
public void childEvent(CuratorFramework client, PathChildrenCacheEvent event)
throws Exception {
ChildData data = event.getData();
if (data == null) {
System.out.println("No data in event[" + event + "]");
} else {
System.out.println(
"Receive event: "
+ "type=["
+ event.getType()
+ "]"
+ ", path=["
+ data.getPath()
+ "]"
+ ", data=["
+ new String(data.getData())
+ "]"
+ ", stat=["
+ data.getStat()
+ "]");
}
}
});
watcher.start(PathChildrenCache.StartMode.BUILD_INITIAL_CACHE);
System.out.println("Register zk watcher successfully!");
Thread.sleep(Integer.MAX_VALUE);
}
/** 监测节点的 创建， 更新 */
@Test
public void testWatcherNode() throws Exception {
// 节点事件监听
final NodeCache watcher = new NodeCache(client, ZK_PATH + "/node");
watcher
.getListenable()
.addListener(
new NodeCacheListener() {
@Override
public void nodeChanged() throws Exception {
System.out.println(
"NodeCache changed, data is: "
+ new String(watcher.getCurrentData().getData()));
}
});
watcher.start(false);
Thread.sleep(Integer.MAX_VALUE);
}
/** 监听某个节点以下所有节点的状态 */
@Test
public void testWatcherTree() throws Exception {
final TreeCache watcher = new TreeCache(client, ZK_PATH);
watcher
.getListenable()
.addListener(
new TreeCacheListener() {
@Override
public void childEvent(CuratorFramework client, TreeCacheEvent event)
throws Exception {
ChildData data = event.getData();
if (data == null) {
System.out.println("No data in event[" + event + "]");
} else {
System.out.println(
"Receive event: "
+ "type=["
+ event.getType()
+ "]"
+ ", path=["
+ data.getPath()
+ "]"
+ ", data=["
+ new String(data.getData())
+ "]"
+ ", stat=["
+ data.getStat()
+ "]");
}
}
});
watcher.start();
Thread.sleep(Integer.MAX_VALUE);
}