Monitoring Center Extension

<!-- Define the monitoring center -->
<dubbo:monitor address="xxx://ip:port" />

src
 |-main
    |-java
        |-com
            |-xxx
                |-XxxMonitorFactory.java (implements the MonitorFactory interface)
                |-XxxMonitor.java (implements the Monitor interface)
    |-resources
        |-META-INF
            |-dubbo
                |-org.apache.dubbo.monitor.MonitorFactory (text file, content: xxx=com.xxx.XxxMonitorFactory)

package com.xxx;
 
import org.apache.dubbo.monitor.MonitorFactory;
import org.apache.dubbo.monitor.Monitor;
import org.apache.dubbo.common.URL;
 
public class XxxMonitorFactory implements MonitorFactory {
    public Monitor getMonitor(URL url) {
        return new XxxMonitor(url);
    }
}

package com.xxx;
 
import org.apache.dubbo.monitor.Monitor;
 
public class XxxMonitor implements Monitor {
    public void count(URL statistics) {
        // ...
    }
}

xxx=com.xxx.XxxMonitorFactory