import com.netflix.loadbalancer.RandomRule; //导入依赖的package包/类
@Test
public void ruleOverridesToRandom() throws Exception {
	RandomRule.class.cast(getLoadBalancer("foo").getRule());
	RoundRobinRule.class.cast(getLoadBalancer("bar").getRule());
}
 

import com.netflix.loadbalancer.RandomRule; //导入依赖的package包/类
@Override
public IRule createLoadBalancerRule(String ruleName) {
  if (RULE_RoundRobin.equals(ruleName)) {
    return new RoundRobinRule();
  } else if (RULE_Random.equals(ruleName)) {
    return new RandomRule();
  } else if (RULE_WeightedResponse.equals(ruleName)) {
    return new WeightedResponseTimeRule();
  } else if (RULE_SessionStickiness.equals(ruleName)) {
    return new SessionStickinessRule();
  } else {
    throw new IllegalStateException("unexpected code to reach here, value is " + ruleName);
  }
}
 

import com.netflix.loadbalancer.RandomRule; //导入依赖的package包/类
@Test
public void testRuleName() {
  System.setProperty("cse.loadbalance.mytest1.strategy.name", "RoundRobin");
  System.setProperty("cse.loadbalance.mytest2.strategy.name", "Random");
  System.setProperty("cse.loadbalance.mytest3.strategy.name", "WeightedResponse");
  System.setProperty("cse.loadbalance.mytest4.strategy.name", "SessionStickiness");

  BeansHolder holder = new BeansHolder();
  List<ExtensionsFactory> extensionsFactories = new ArrayList<>();
  extensionsFactories.add(new RuleClassNameExtentionsFactory());
  extensionsFactories.add(new RuleNameExtentionsFactory());
  extensionsFactories.add(new DefaultRetryExtensionsFactory());
  Deencapsulation.setField(holder, "extentionsFactories", extensionsFactories);
  holder.init();

  Assert.assertEquals(RoundRobinRule.class.getName(),
      ExtensionsManager.createLoadBalancerRule("mytest1").getClass().getName());
  Assert.assertEquals(RandomRule.class.getName(),
      ExtensionsManager.createLoadBalancerRule("mytest2").getClass().getName());
  Assert.assertEquals(WeightedResponseTimeRule.class.getName(),
      ExtensionsManager.createLoadBalancerRule("mytest3").getClass().getName());
  Assert.assertEquals(SessionStickinessRule.class.getName(),
      ExtensionsManager.createLoadBalancerRule("mytest4").getClass().getName());

  System.getProperties().remove("cse.loadbalance.mytest1.strategy.name");
  System.getProperties().remove("cse.loadbalance.mytest2.strategy.name");
  System.getProperties().remove("cse.loadbalance.mytest3.strategy.name");
  System.getProperties().remove("cse.loadbalance.mytest4.strategy.name");
}
 

import com.netflix.loadbalancer.RandomRule; //导入依赖的package包/类
@Test
public void testRuleClassName() {
  System.setProperty("cse.loadbalance.mytest1.NFLoadBalancerRuleClassName",
      "com.netflix.loadbalancer.RoundRobinRule");
  System.setProperty("cse.loadbalance.mytest2.NFLoadBalancerRuleClassName",
      "com.netflix.loadbalancer.WeightedResponseTimeRule");
  System.setProperty("cse.loadbalance.mytest3.NFLoadBalancerRuleClassName", "com.netflix.loadbalancer.RandomRule");
  System.setProperty("cse.loadbalance.mytest4.NFLoadBalancerRuleClassName",
      "org.apache.servicecomb.loadbalance.SessionStickinessRule");

  BeansHolder holder = new BeansHolder();
  List<ExtensionsFactory> extensionsFactories = new ArrayList<>();
  extensionsFactories.add(new RuleClassNameExtentionsFactory());
  extensionsFactories.add(new RuleNameExtentionsFactory());
  extensionsFactories.add(new DefaultRetryExtensionsFactory());
  Deencapsulation.setField(holder, "extentionsFactories", extensionsFactories);
  holder.init();

  Assert.assertEquals(RoundRobinRule.class.getName(),
      ExtensionsManager.createLoadBalancerRule("mytest1").getClass().getName());
  Assert.assertEquals(WeightedResponseTimeRule.class.getName(),
      ExtensionsManager.createLoadBalancerRule("mytest2").getClass().getName());
  Assert.assertEquals(RandomRule.class.getName(),
      ExtensionsManager.createLoadBalancerRule("mytest3").getClass().getName());
  Assert.assertEquals(SessionStickinessRule.class.getName(),
      ExtensionsManager.createLoadBalancerRule("mytest4").getClass().getName());

  System.getProperties().remove("cse.loadbalance.mytest1.NFLoadBalancerRuleClassName");
  System.getProperties().remove("cse.loadbalance.mytest2.NFLoadBalancerRuleClassName");
  System.getProperties().remove("cse.loadbalance.mytest3.NFLoadBalancerRuleClassName");
  System.getProperties().remove("cse.loadbalance.mytest4.NFLoadBalancerRuleClassName");

  Assert.assertEquals(DefaultLoadBalancerRetryHandler.class.getName(),
      ExtensionsManager.createRetryHandler("mytest1").getClass().getName());
}
 

import com.netflix.loadbalancer.RandomRule; //导入依赖的package包/类
/**
     * 负载均衡策略
     * @return
     */
    @Bean
    public IRule ribbonRule() {
//        return new BestAvailableRule(); //选择一个最小的并发请求的server
//        return new WeightedResponseTimeRule(); //根据相应时间分配一个weight，相应时间越长，weight越小，被选中的可能性越低。
//        return new RetryRule(); //对选定的负载均衡策略机上重试机制。
//        return new RoundRobinRule(); //roundRobin方式轮询选择server
        return new RandomRule(); //随机选择一个server
//        return new ZoneAvoidanceRule(); //复合判断server所在区域的性能和server的可用性选择server
//        return new AvailabilityFilteringRule();
    }
 

import com.netflix.loadbalancer.RandomRule; //导入依赖的package包/类
@Bean
public IRule ribbonRule() {
  // 负载均衡规则，改为随机
  return new RandomRule();
}
 

import com.netflix.loadbalancer.RandomRule; //导入依赖的package包/类
@Bean
public IRule ribbonRule() {
    return new RandomRule();
}
 

import com.netflix.loadbalancer.RandomRule; //导入依赖的package包/类
private IRule getRandomRule() {
	RandomRule randomRule = new RandomRule();
	randomRule.setLoadBalancer(this);
	return randomRule;
}
 

import com.netflix.loadbalancer.RandomRule; //导入依赖的package包/类
@Test
public void ruleOverridesToRandom() throws Exception {
	assumeNotTravis();
	RandomRule.class.cast(getLoadBalancer("foo2").getRule());
	ZoneAvoidanceRule.class.cast(getLoadBalancer("bar").getRule());
}
 

import com.netflix.loadbalancer.RandomRule; //导入依赖的package包/类
@Bean
public IRule ribbonRule() {
	return new RandomRule();
}