zookeeper【1】配置管理

为什么要用统一配置？

我们做项目时用到的配置比如数据库配置等...我们都是写死在项目里面，如果需要更改，那么也是的修改配置文件然后再投产上去，那么问题来了，如果做集群的呢，有100台机器，这时候做修改那就太不切实际了；那么就需要用到统一配置管理啦。

 

采用方案

1.公共配置抽取存放于zookeeper中并落地数据库

2.对公共配置修改后发布到zookeeper中并落地数据库

3.对应用开启配置实时监听，zookeeper配置文件一旦被修改，应用可实时监听到并获取

 

实现代码：

import java.io.serializable;

public class config implements serializable{

    /**
     *
     */
    private static final long serialversionuid = 1l;
    private string usernm;
    private string userpw;

    public config() {
    }
    public config(string usernm, string userpw) {
        this.usernm = usernm;
        this.userpw = userpw;
    }
    public string getusernm() {
        return usernm;
    }
    public void setusernm(string usernm) {
        this.usernm = usernm;
    }
    public string getuserpw() {
        return userpw;
    }
    public void setuserpw(string userpw) {
        this.userpw = userpw;
    }
    @override
    public string tostring() {
        return "config [usernm=" + usernm + ", userpw=" + userpw + "]";
    }

}

import org.i0itec.zkclient.zkclient;

public class zkconfigmag {

    private config config;
    /**
     * 从数据库加载配置
     */
    public config downloadconfigfromdb(){
        //getdb
        config = new config("nm", "pw");
        return config;
    }

    /**
     * 配置文件上传到数据库
     */
    public void uploadconfigtodb(string nm, string pw){
        if(config==null)config = new config();
        config.setusernm(nm);
        config.setuserpw(pw);
        //updatedb
    }

    /**
     * 配置文件同步到zookeeper
     */
    public void syncconfigtozk(){
        zkclient zk = new zkclient("localhost:2181");
        if(!zk.exists("/zkconfig")){
            zk.createpersistent("/zkconfig",true);
        }
        zk.writedata("/zkconfig", config);
        zk.close();
    }
}

public class zkconfigtest {

    public static void main(string[] args) {
        zkconfigmag mag = new zkconfigmag();
        config config = mag.downloadconfigfromdb();
        system.out.println("....加载数据库配置...."+config.tostring());
        mag.syncconfigtozk();
        system.out.println("....同步配置文件到zookeeper....");

        //歇会，这样看比较清晰
        try {
            thread.sleep(10000);
        } catch (interruptedexception e) {
            // todo auto-generated catch block
            e.printstacktrace();
        }

        mag.uploadconfigtodb("ccccc", "ppppp");
        system.out.println("....修改配置文件...."+config.tostring());
        mag.syncconfigtozk();
        system.out.println("....同步配置文件到zookeeper....");


    }

}

import org.i0itec.zkclient.izkdatalistener;
import org.i0itec.zkclient.zkclient;

public class zkgetconfigclient {

    private config config;

    public config getconfig() {
        zkclient zk = new zkclient("localhost:2181");
        config = (config)zk.readdata("/zkconfig");
        system.out.println("加载到配置："+config.tostring());

        //监听配置文件修改
        zk.subscribedatachanges("/zkconfig", new izkdatalistener(){
            @override
            public void handledatachange(string arg0, object arg1)
                    throws exception {
                config = (config) arg1;
                system.out.println("监听到配置文件被修改："+config.tostring());
            }

            @override
            public void handledatadeleted(string arg0) throws exception {
                config = null;
                system.out.println("监听到配置文件被删除");
            }

        });
        return config;
    }
    public static void main(string[] args) {
        zkgetconfigclient client = new zkgetconfigclient();
        client.getconfig();
        system.out.println(client.config.tostring());
        for(int i = 0;i<100;i++){
            system.out.println(client.config.tostring());
            try {
                thread.sleep(1000);
            } catch (interruptedexception e) {
                // todo auto-generated catch block
                e.printstacktrace();
            }
        }

    }


}