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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 project and introduce the following dependencies:

<dependencies>
    <dependency>
        <groupId>org.apache.shenyu</groupId>
        <artifactId>shenyu-plugin-base</artifactId>
        <version>${project.version}</version>
    </dependency>
</dependencies>

• 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
    }
}

• In the project's META-INF/services directory, create 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=xxx.xxx.xxx.CustomLoadBalancer

• Package the project and copy it to the lib or ext-lib directory of the gateway (bootstrap-bin).

• 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: