---

title: Custom Load Balancer keywords: [“LoadBalance”] description: Custom Load Balance

• This paper describes how to customize the extension of org.apache.shenyu.loadbalancer.spi.LoadBalancer.

• Create a new class CustomLoadBalancer, extends org.apache.shenyu.loadbalancer.spi.AbstractLoadBalancer.

public class CustomLoadBalancer extends AbstractLoadBalancer {

    @Override
    public Upstream doSelect(final List<Upstream> upstreamList, final String ip) {
        // custom load balancer
    }
}

• Add key-value as following in org.apache.shenyu.loadbalancer.spi.LoadBalancer file.

${spi name}=${custom class path}

${spi name} represents the name of spi and ${custom class path} represents the fully qualified name of the class. Such as:

custom=org.apache.shenyu.loadbalancer.spi.CustomLoadBalancer

• Add enum in org.apache.shenyu.common.enums.LoadBalanceEnum class:

/**
 * Custom load balance enum.
 */
    CUSTOM(4, "custom", true),

• In the Apache ShenYu gateway management system --> BasicConfig --> Dictionary, find the dictionary code as LOAD_BALANCE, add a new piece of data, pay attention to the dictionary name: ${spi name}.

DictionaryType: loadBalance;

DictionaryCode: LOAD_BALANCE;

DictionaryName: ${spi name}, input your custom spi name;

DictionaryValue: When used, the value of the drop-down box, do not repeat with the existing;

DictionaryDescribe: desc your custom match strategy;

Sort: to sort;

• When adding selectors or rules, you can use custom MatchType: