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title: Custom Parameter Data keywords: [“ParameterData”] description: Custom Parameter Data

This paper describes how to customize the extension of org.apache.shenyu.plugin.base.condition.data.ParameterData.

• 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 CustomParameterData, implements org.apache.shenyu.plugin.base.condition.data.ParameterData, add annotation org.apache.shenyu.spi.Join.

/**
 * This is custom parameter data.
 */
@Join
public class CustomParameterData implements ParameterData {
    
    @Override
    public String builder(final String paramName, final ServerWebExchange exchange) {
        // custom parameter data
    }
}

• In the project's META-INF/services directory, create org.apache.shenyu.plugin.base.condition.data.ParameterData file, add key-value as following:

${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.CustomParameterData

• 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 PARAM_TYPE, add a new piece of data, pay attention to the dictionary name: ${spi name}.

DictionaryType: paramType;

DictionaryCode: PARAM_TYPE;

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;

Status: open or close.

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