Ribbon 负载均衡的连轴方法,它聚合来IPing,IRule, ServerList, ServerListUpdater, ServerListFilter。
ILoadBalancer
public interface ILoadBalancer { /** * Initial list of servers. * This API also serves to add additional ones at a later time * The same logical server (host:port) could essentially be added multiple times * (helpful in cases where you want to give more "weightage" perhaps ..) * * @param newServers new servers to add */ public void addServers(List<Server> newServers); /** * Choose a server from load balancer. * * @param key An object that the load balancer may use to determine which server to return. null if * the load balancer does not use this parameter. * @return server chosen */ public Server chooseServer(Object key); /** * To be called by the clients of the load balancer to notify that a Server is down * else, the LB will think its still Alive until the next Ping cycle - potentially * (assuming that the LB Impl does a ping) * * @param server Server to mark as down */ public void markServerDown(Server server); /** * @deprecated 2016-01-20 This method is deprecated in favor of the * cleaner {@link #getReachableServers} (equivalent to availableOnly=true) * and {@link #getAllServers} API (equivalent to availableOnly=false). * * Get the current list of servers. * * @param availableOnly if true, only live and available servers should be returned */ @Deprecated public List<Server> getServerList(boolean availableOnly); /** * @return Only the servers that are up and reachable. */ public List<Server> getReachableServers(); /** * @return All known servers, both reachable and unreachable. */ public List<Server> getAllServers(); }
AbstractLoadBalancer
public abstract class AbstractLoadBalancer implements ILoadBalancer { public enum ServerGroup{ ALL, STATUS_UP, STATUS_NOT_UP } /** * delegate to {@link #chooseServer(Object)} with parameter null. */ public Server chooseServer() { return chooseServer(null); } /** * List of servers that this Loadbalancer knows about * * @param serverGroup Servers grouped by status, e.g., {@link ServerGroup#STATUS_UP} */ public abstract List<Server> getServerList(ServerGroup serverGroup); /** * Obtain LoadBalancer related Statistics */ public abstract LoadBalancerStats getLoadBalancerStats(); }
BaseLoadBalancer
基本实现了ILoadBalancer所使用的接口。
DynamicServerListLoadBalancer
在BaseLoadBalancer上,增加额外特性。这里主要是实现动态的服务列表特性。
在DynamicServerListLoadBalancer之上,增加了额外的特性。分zone的形式来配置多个loadBalancer.
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