Ribbon 负载均衡的连轴方法，它聚合来IPing，IRule, ServerList, ServerListUpdater, ServerListFilter。
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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 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 getServerList(boolean availableOnly);
/**
* @return Only the servers that are up and reachable.
*/
public List getReachableServers();
/**
* @return All known servers, both reachable and unreachable.
*/
public List 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 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.