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hippo4j/docs/versioned_docs/version-1.4.2/user_docs/dev_manual/rejected-policy-custom.md

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拒绝策略自定义

Hippo4j 通过 SPI 的方式对拒绝策略进行扩展,可以让用户在 Hippo4j 中完成自定义拒绝策略实现。

Hippo4j Server 拒绝策略扩展

自定义拒绝策略,实现 CustomRejectedExecutionHandler 接口,示例如下:

public class ErrorLogRejectedExecutionHandler implements CustomRejectedExecutionHandler {

    @Override
    public Integer getType() {
        return 12;
    }

    @Override
    public RejectedExecutionHandler generateRejected() {
        return new CustomErrorLogRejectedExecutionHandler();
    }

    public static class CustomErrorLogRejectedExecutionHandler implements RejectedExecutionHandler {

        @Override
        public void rejectedExecution(Runnable r, ThreadPoolExecutor executor) {
            Logger logger = LoggerFactory.getLogger(this.getClass());
            logger.error("线程池抛出拒绝策略");
        }
    }
}

创建 src/main/resources/META-INF/services 目录,创建 SPI 自定义拒绝策略文件 cn.hippo4j.common.executor.support.CustomRejectedExecutionHandler

cn.hippo4j.common.executor.support.CustomRejectedExecutionHandler 文件内仅放一行自定义拒绝策略全限定名即可,示例:

cn.hippo4j.example.core.handler.ErrorLogRejectedExecutionHandler

创建、修改线程池页面选择 CustomRejectedPolicy自定义 SPI 策略)

拒绝策略触发时,完成上述代码效果,仅打印异常日志提示。

2022-08-01 21:27:49.515 ERROR 48928 --- [ateHandler.test] r$CustomErrorLogRejectedExecutionHandler : 线程池抛出拒绝策略

:::note 具体参考 hippo4j-example/hippo4j-spring-boot-starter-example 模块。 :::