????????????У??????????????????????????????????????????????????ZooKeeper??
????????????ZooKeeper?????????????????ZooKeeper????????????????????Щ??????????????????????????????????У?????????ZooKeeper???Щ???????????????????????????????????????????????????Щ?·??
??????????ZooKeeper?????????ZK?????????Curator Framework????Apache????????????????????ZK????????????????????????Curator Framework??????????curator-recipes??????????????????磺????????Leader?????????????????С?Counter???????????Curator??????????????????
???????ZK Client??Server????????????
???????????Fluent???????API??
??????ZK??????ó????????????
?????????????????????Spring PropertyPlaceholderConfigurer?????????????????ZooKeeper????????????????
???????ù????Configuration Management????
?????????????У??????????????????????????????????????????????????????????????????????????????飬???????????????????y???????????????????????
????OK??Let's go??
??????????????????

????ZooKeeperPropertyPlaceholderConfigurer.java
???????org.springframework.beans.factory.config.PropertyPlaceholderConfigurer????дprocessProperties(beanFactoryToProcess?? props)???????????ü???????
package org.bigmouth.common.zookeeper.config.spring;
import java.io.UnsupportedEncodingException;
import java.util.Properties;
import org.apache.commons.lang.StringUtils;
import org.bigmouth.common.zookeeper.config.Config;
import org.bigmouth.common.zookeeper.config.ZooKeeperConfig;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.config.PropertyPlaceholderConfigurer;
public class ZooKeeperPropertyPlaceholderConfigurer extends PropertyPlaceholderConfigurer {
public static final String PATH = "zoo.paths";
@Override
protected void processProperties(ConfigurableListableBeanFactory beanFactoryToProcess?? Properties props)
throws BeansException {
super.processProperties(beanFactoryToProcess?? props);
try {
fillCustomProperties(props);
System.out.println(props);
}
catch (Exception e) {
// Ignore
e.printStackTrace();
}
}
private void fillCustomProperties(Properties props) throws Exception {
byte[] data = getData(props);
fillProperties(props?? data);
}
private void fillProperties(Properties props?? byte[] data) throws UnsupportedEncodingException {
String cfg = new String(data?? "UTF-8");
if (StringUtils.isNotBlank(cfg)) {
// ?????????????????????????á?value?а???=??????#????
String[] cfgItem = StringUtils.split(cfg?? "=");
props.put(cfgItem[0]?? cfgItem[1]);
}
}
private byte[] getData(Properties props) throws Exception {
String path = props.getProperty(PATH);
Config config = new ZooKeeperConfig();
return config.getConfig(path);
}
}
????Config.java
???????ò??????
????package org.bigmouth.common.zookeeper.config;
????public interface Config {
????byte[] getConfig(String path) throws Exception;
????}
????Startup.java
??????????????
????package org.bigmouth.common.zookeeper.config;
????import org.springframework.context.support.ClassPathXmlApplicationContext;
????public class Startup {
????public static void main(String[] args) {
????new ClassPathXmlApplicationContext("classpath:/config/applicationContext.xml");
????}
????}