rabbion相关类（LoadBalancerStats、ServerListUpdater）介绍：

 负载均衡数据记录LoadBalancerStats

public class LoadBalancerStats {

    String name;

    //zone相关信息，默认用不到

    volatile Map<String, ZoneStats> zoneStatsMap = new ConcurrentHashMap<String, ZoneStats>();

    volatile Map<String, List<? extends Server>> upServerListZoneMap = new ConcurrentHashMap<String, List<? extends Server>>();

 

    //动态配置，连接失败上限

    private volatile DynamicIntProperty connectionFailureThreshold;

    //动态配置，熔断时间因子

    private volatile DynamicIntProperty circuitTrippedTimeoutFactor;

    //动态配置，最大熔断时间

    private volatile DynamicIntProperty maxCircuitTrippedTimeout;

    //动态配置，每个Server负载均衡统计数据过期时间配置

    private static final DynamicIntProperty SERVERSTATS_EXPIRE_MINUTES =

        DynamicPropertyFactory.getInstance().getIntProperty("niws.loadbalancer.serverStats.expire.minutes", 30);

 

    //每个Server的负载均衡统计数据

    private final LoadingCache<Server, ServerStats> serverStatsCache =

        CacheBuilder.newBuilder()

            .expireAfterAccess(SERVERSTATS_EXPIRE_MINUTES.get(), TimeUnit.MINUTES)

            .removalListener(new RemovalListener<Server, ServerStats>() {

                @Override

                public void onRemoval(RemovalNotification<Server, ServerStats> notification) {

                    notification.getValue().close();

                }

            })

            .build(

                new CacheLoader<Server, ServerStats>() {

                    public ServerStats load(Server server) {

                        return createServerStats(server);

                    }

                });

}

 

服务实例列表更新机制实现的接口ServerListUpdater

public interface ServerListUpdater {

 

    //定义了更新服务实例列表的操作doUpdate

    public interface UpdateAction {

        void doUpdate();

    }

 

    //开始调度更新服务实例列表，可以看到这里以UpdateAction为传参

    void start(UpdateAction updateAction);

 

    //停止更新服务实例列表

    void stop();

 

    //上次服务实例列表更新时间

    String getLastUpdate();

 

    //上次服务实例列表更新时间间隔

    long getDurationSinceLastUpdateMs();

 

    //已经错过几轮更新

    int getNumberMissedCycles();

 

    //使用线程池大小

    int getCoreThreads();

}