這篇文章將為大家詳細(xì)講解有關(guān)ZooKeeper如何配置管理,小編覺(jué)得挺實(shí)用的,因此分享給大家做個(gè)參考,希望大家閱讀完這篇文章后可以有所收獲。
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主要完成的目標(biāo)是:Spring PropertyPlaceholderConfigurer配置文件加載器集成ZooKeeper來(lái)實(shí)現(xiàn)遠(yuǎn)程配置讀取。
配置管理(Configuration Management)。
在集群服務(wù)中,可能都會(huì)遇到一個(gè)問(wèn)題:那就是當(dāng)需要修改配置的時(shí)候,必須要對(duì)每個(gè)實(shí)例都進(jìn)行修改,這是一個(gè)很繁瑣的事情,并且易出錯(cuò)。當(dāng)然可以使用腳本來(lái)解決,但這不是最好的解決辦法。
OK,Let's go!
ZooKeeperPropertyPlaceholderConfigurer.java
繼承org.springframework.beans.factory.config.PropertyPlaceholderConfigurer,重寫(xiě)processProperties(beanFactoryToProcess, props)來(lái)完成遠(yuǎn)端配置加載的實(shí)現(xiàn)
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)) { // 完整的應(yīng)該還需要處理:多條配置、value中包含=、忽略#號(hào)開(kāi)頭 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
配置操作接口
package org.bigmouth.common.zookeeper.config; public interface Config { byte[] getConfig(String path) throws Exception; }
Startup.java
程序啟動(dòng)入口
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"); } }
ZooKeeperConfig.java
配置操作接口ZooKeeper的實(shí)現(xiàn)
package org.bigmouth.common.zookeeper.config; import org.apache.curator.framework.CuratorFramework; import org.apache.zookeeper.data.Stat; public class ZooKeeperConfig implements Config { @Override public byte[] getConfig(String path) throws Exception { CuratorFramework client = ZooKeeperFactory.get(); if (!exists(client, path)) { throw new RuntimeException("Path " + path + " does not exists."); } return client.getData().forPath(path); } private boolean exists(CuratorFramework client, String path) throws Exception { Stat stat = client.checkExists().forPath(path); return !(stat == null); } }
ZooKeeperFactory.java
管理ZooKeeper客戶端連接
package org.bigmouth.common.zookeeper.config; import org.apache.curator.RetryPolicy; import org.apache.curator.framework.CuratorFramework; import org.apache.curator.framework.CuratorFrameworkFactory; import org.apache.curator.retry.ExponentialBackoffRetry; public class ZooKeeperFactory { public static final String CONNECT_STRING = "172.16.3.42:2181,172.16.3.65:2181,172.16.3.24:2181"; public static final int MAX_RETRIES = 3; public static final int BASE_SLEEP_TIMEMS = 3000; public static final String NAME_SPACE = "cfg"; public static CuratorFramework get() { RetryPolicy retryPolicy = new ExponentialBackoffRetry(BASE_SLEEP_TIMEMS, MAX_RETRIES); CuratorFramework client = CuratorFrameworkFactory.builder() .connectString(CONNECT_STRING) .retryPolicy(retryPolicy) .namespace(NAME_SPACE) .build(); client.start(); return client; } }
applicationContext.xml
配置加載器使用我們自己創(chuàng)建的ZooKeeperPropertyPlaceholderConfigurer,因?yàn)樗貙?xiě)了processProperties方法。這個(gè)方法里會(huì)去讀取遠(yuǎn)程配置。
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd"> <beans> <bean class="org.bigmouth.common.zookeeper.config.spring.ZooKeeperPropertyPlaceholderConfigurer"> <property name="systemPropertiesModeName" value="SYSTEM_PROPERTIES_MODE_OVERRIDE" /> <property name="ignoreResourceNotFound" value="true" /> <property name="locations"> <list> <value>classpath:application.properties</value> </list> </property> </bean> </beans>
application.properties
項(xiàng)目配置文件,里面除了配置ZooKeeper服務(wù)器地址和讀取的節(jié)點(diǎn)以外,其他所有的配置都應(yīng)該保存在ZooKeeper中。
zoo.paths=/properties
登錄ZooKeeper中為節(jié)點(diǎn) /cfg/properties 添加一條配置項(xiàng):
如圖所示:我創(chuàng)建了一個(gè)節(jié)點(diǎn) /cfg/properties 并設(shè)置內(nèi)容為:jdbc.driver=org.postgresql.Driver
OK 了,zoo.paths是本地application.properties文件中的,jdbc.driver是遠(yuǎn)程ZooKeeper服務(wù)器中的。
<dependency> <groupId>commons-lang</groupId> <artifactId>commons-lang</artifactId> <version>2.4</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>3.0.3.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>3.0.3.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>3.0.3.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context-support</artifactId> <version>3.0.3.RELEASE</version> </dependency> <!-- ZooKeeper --> <dependency> <groupId>org.apache.zookeeper</groupId> <artifactId>zookeeper</artifactId> <version>3.4.6</version> </dependency> <dependency> <groupId>org.apache.curator</groupId> <artifactId>curator-framework</artifactId> <version>2.4.2</version> </dependency> <dependency> <groupId>org.apache.curator</groupId> <artifactId>curator-recipes</artifactId> <version>2.4.2</version> </dependency>
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