我们可以通过RabbitMQ将Spring Cloud Config服务器的发布配置设置用于MicroServices节点。这个解决方案的缺点：

Spring Cloud Config仅支持GIT repo以保存配置

当配置服务器上的数据发生更改时，您需要手动将事件发送到所有MicroServices节点

让我们考虑另一个解决方案，如何删除Spring Config Server并将配置数据的分发替换为具有HazelCast数据网格的节点。

配置Hazelcast

首先你需要为Hazelcast添加maven依赖:( hazelcast-spring，因为我们将使用Spring缓存API和Hazelcast作为CACHE提供者)

com.hazelcast

hazelcast-spring

然后你需要配置Hazelcast，你有以下选择：

配置com.hazelcast.config.Config 或

将hazelcast.xml配置放到classpath中。请参阅此文档 或

如果您对hazelcast.xml名称不满意，请在文件中设置-Dhazelcast.config变量

我的配置看起来：

@Bean

public Config config() {

Config config = new Config();

config.setInstanceName("HazelcastService");

config.setProperty("hazelcast.wait.seconds.before.join","10");

config.getGroupConfig().setName("mygroup");

config.getGroupConfig().setPassword("mypassword");

config.getNetworkConfig().setPortAutoIncrement(true);

config.getNetworkConfig().setPort(10555);

config.getNetworkConfig().getJoin().getMulticastConfig().setEnabled(true);

SSLConfig sslConfig = new SSLConfig();

sslConfig.setEnabled(false);

config.getNetworkConfig().setSSLConfig(sslConfig);

return config;

}

始终使用Hazelcast群组。不要干涉他人。检查GroupConfig。

始终使用端口增量。有时某些环境中的端口可能会被占用。

如果您计划将Hazelcast用作分布式缓存，那么您需要使用Hazelcast实现覆盖cacheManager bean：

@Bean

HazelcastInstance hazelcastInstance(){

return Hazelcast.newHazelcastInstance(config());

}

@Bean

public CacheManager cacheManager(){

return new HazelcastCacheManager(hazelcastInstance());

}

带有HazelCast缓存的MicroServices

有以下Util服务：

package com.example.hazelcast;

import org.springframework.cache.annotation.Cacheable;

/**

* Created by tomas.kloucek on 18.1.2017.

*/public interface IHazelCastUtilService {

@Cacheable("batchSize")

int getBatchSize();

}

实现：

public class HazelCastUtilService implements IHazelCastUtilService {

@Override

public int getBatchSize() {

try {

System.out.println("Getting batch size from DAO...");

TimeUnit.SECONDS.sleep(5);// (1)} catch (InterruptedException e) {

e.printStackTrace();

}

return 3;

}

}

让我们在以下的上下文MicroServices之间共享此服务：

Cities MicroService:

@RestController

public class CitiesController {

final City[] cities = {

new City("Brno","Czech republic"),

new City("Bern","Switzeland"),

new City("Berlin","Germany"),

new City("London","England")

};

@Autowired

private IHazelCastUtilService hazelCastUtilService;

@RequestMapping("/cities")

public Cities getCities() {

final Cities result = new Cities();

System.out.println("...Getting city from controller!!...");

for (int i=0; i < hazelCastUtilService.getBatchSize();i++) {

result.getCities().add(cities[i]);

}

return result;

}

}

Persons MicroService:

@RestController

public class PersonsController {

@Autowired

private IHazelCastUtilService hazelCastUtilService;

final Person[] persons = {

new Person("Tomas","Kloucek","Programmer"),

new Person("Linus","Torvalds","Linux"),

new Person("Heinz","Kabutz","Java"),

new Person("Jonathan","Locke","Wicket")

};

@RequestMapping("/persons")

public Persons getPersons() {

final Persons result = new Persons();

System.out.println("...Getting person from controller!!...");

for (int i=0; i < hazelCastUtilService.getBatchSize();i++) {

result.getPersons().add(persons[i]);

}

return result;

}

}

测试演示:

git clone https://bitbucket.org/tomask79/microservice-spring-hazelcast-caching.gitmvn clean install (in the root folder with pom.xml)

cd spring-microservice-registry

java -jar target/registry-0.0.1-SNAPSHOT.war

verify that NetFlix Eureka is running at http://localhost:9761cd ..

cd spring-microservice-service1

java -jar target/service1-0.0.1-SNAPSHOT.war

verify at http://localhost:9761 that citiesService has been registeredcd ..

cd spring-microservice-service2

java -jar target/service2-0.0.1-SNAPSHOT.war

verify at http://localhost:9761 that personsService has been registered

为了确保两个 MicroServices形成Hazelcast集群，你需要看到类似的东西：

Members [2] {

Member [10.130.48.104]:10555 this

Member [10.130.48.104]:10556

}

看到下面输出：

...Getting city from controller!!...

Getting batch size from DAO...

...Getting person from controller!!...

因为之前已经由城市MicroService缓存了“batchSize”设置。太可爱了！