使得Curator注册的MySQL连接节点中存储的是实际的连接对象或连接状态,curator版本为curator-recipes5.0.0,Java版本为18,MySQL版本为8.0.21.给出完整实现代码。
时间: 2023-06-27 09:07:18 浏览: 42
以下是使用Curator注册MySQL连接节点的完整实现代码:
```java
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.recipes.cache.NodeCache;
import org.apache.curator.framework.recipes.cache.NodeCacheListener;
import org.apache.curator.framework.recipes.nodes.PersistentNode;
import org.apache.curator.framework.recipes.nodes.PersistentNode.Mode;
import org.apache.curator.retry.RetryNTimes;
import org.apache.zookeeper.CreateMode;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class MySQLConnectionNode {
private static final String ZK_CONNECTION_STRING = "localhost:2181";
private static final String ZK_PATH = "/mysql/connection";
private CuratorFramework curatorFramework;
private PersistentNode persistentNode;
private NodeCache nodeCache;
private Connection connection;
public MySQLConnectionNode() throws Exception {
curatorFramework = CuratorFrameworkFactory.newClient(ZK_CONNECTION_STRING, new RetryNTimes(5, 1000));
curatorFramework.start();
persistentNode = new PersistentNode(curatorFramework, CreateMode.EPHEMERAL, false, ZK_PATH, getConnectionBytes());
persistentNode.start();
nodeCache = new NodeCache(curatorFramework, ZK_PATH);
nodeCache.getListenable().addListener(new NodeCacheListener() {
@Override
public void nodeChanged() throws Exception {
byte[] data = nodeCache.getCurrentData().getData();
connection = getConnectionFromBytes(data);
}
});
nodeCache.start();
}
public Connection getConnection() {
return connection;
}
private byte[] getConnectionBytes() throws SQLException {
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost/test", "user", "password");
return conn.toString().getBytes();
}
private Connection getConnectionFromBytes(byte[] data) throws SQLException {
String connStr = new String(data);
return DriverManager.getConnection(connStr);
}
public void close() {
nodeCache.close();
persistentNode.close();
curatorFramework.close();
}
}
```
这里我们使用了Curator提供的`PersistentNode`和`NodeCache`来实现注册MySQL连接节点,并监听节点变化。在`getConnectionBytes`方法中,我们创建一个MySQL连接,并将它转换为字节数组存储到ZooKeeper节点中。在`getConnectionFromBytes`方法中,我们从字节数组中解析出MySQL连接对象。通过监听节点变化,我们能够实时获取到MySQL连接对象的变化。