Custom Predicate Judge

• This paper describes how to customize the extension of org.apache.shenyu.plugin.base.condition.judge.PredicateJudge.

• Create a new class CustomPredicateJudge, implements org.apache.shenyu.plugin.base.condition.judge.PredicateJudge, add annotation org.apache.shenyu.spi.Join.

/**
 * custom predicate judge.
 */
@Join
public class CustomPredicateJudge implements PredicateJudge {

    @Override
    public Boolean judge(final ConditionData conditionData, final String realData) {
        // Custom Predicate Judge
    }
}

• In org.apache.shenyu.plugin.base.condition.judge.PredicateJudge file, add key-value as following:

script

${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:

script

custom=org.apache.shenyu.examples.http.judge.CustomPredicateJudge

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

    /**
     * custom operator enum.
     */
    CUSTOM("custom", true),

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

DictionaryType: operator;

DictionaryCode: OPERATOR;

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 predicate judge: