---

title: Custom Rate Limiter keywords: [“RateLimiter”] description: Custom Rate Limiter

Explanation

• Before custom development, please customize and build the gateway environment first, please refer to: custom deployment.

• This article describes how to customize the extension of org.apache.shenyu.plugin.ratelimiter.algorithm.RateLimiterAlgorithm .

Extension

• 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 ${you class}, implements org.apache.shenyu.plugin.ratelimiter.algorithm.RateLimiterAlgorithm

public class ${you class} implements RateLimiterAlgorithm<T> {
   
    /**
     * Gets script.
     *
     * @return the script
     */
    public RedisScript<T> getScript() {
        //coding and return
    }   
    
    /**
     * Gets keys.
     *
     * @param id the id
     * @return the keys
     */
    public List<String> getKeys(String id) {
        //coding and return
    }
    
    /**
     * Callback string.
     *
     * @param script the script
     * @param keys the keys
     * @param scriptArgs the script args
     */
    public void callback(final RedisScript<?> script, final List<String> keys, final List<String> scriptArgs) {
        //coding and return
    }
}

• In the project resources directory，Create a new META-INF/shenyu directory， and the new file name is : org.apache.shenyu.plugin.ratelimiter.algorithm.RateLimiterAlgorithm. add ${you spi name} = ${you class path}:

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

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

• In the Admin service ---> BasicConfig ---> Dictionary , Find the dictionary code as ALGORITHM_*, add a new piece of data, pay attention to the dictionary name: ${you spi name}.

• Or execute the following custom SQL statement：

INSERT IGNORE INTO `shenyu_dict` (
        `id`,
        `type`,
        `dict_code`,
        `dict_name`,
        `dict_value`,
        `desc`,
        `sort`,
        `enabled`,
        `date_created`,
        `date_updated`
    )
VALUES (
        'you id',
        'matchMode',
        'MATCH_MODE',
        'you spi name',
        'you value',
        'you spi name',
        0,
        1,
        '2021-08-30 19:29:10',
        '2021-08-30 20:15:23'
    );