负载均衡 ribbon

ribbon-loadbalacer.-2.2.2.jar

抽象类：public abstract class AbstractServerPredicate

//随机策略

public Optional<Server> chooseRandomlyAfterFiltering(List<Server> servers) {
    List<Server> eligible = this.getEligibleServers(servers);
    return eligible.size() == 0?Optional.absent():Optional.of(eligible.get(this.random.nextInt(eligible.size())));
}

//重复轮询策略（nextIndex自增后，服务器的个数取模）
public Optional<Server> chooseRoundRobinAfterFiltering(List<Server> servers) {
    List<Server> eligible = this.getEligibleServers(servers);
    return eligible.size() == 0?Optional.absent():Optional.of(eligible.get(this.nextIndex.getAndIncrement() % eligible.size()));
}

//随机策略
public Optional<Server> chooseRandomlyAfterFiltering(List<Server> servers, Object loadBalancerKey) {
    List<Server> eligible = this.getEligibleServers(servers, loadBalancerKey);
    return eligible.size() == 0?Optional.absent():Optional.of(eligible.get(this.random.nextInt(eligible.size())));
}

//重复轮询策略（nextIndex自增后，服务器的个数取模）

public Optional<Server> chooseRoundRobinAfterFiltering(List<Server> servers, Object loadBalancerKey) {
    List<Server> eligible = this.getEligibleServers(servers, loadBalancerKey);
    return eligible.size() == 0?Optional.absent():Optional.of(eligible.get(this.nextIndex.getAndIncrement() % eligible.size()));
}