package com.bycrm.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

import java.util.concurrent.Executor;
import java.util.concurrent.ThreadPoolExecutor;

/**
 * 异步任务配置：为消息推送等异步操作提供线程池。
 */
@Configuration
@EnableAsync
public class AsyncConfig {

    /**
     * pushplus 推送专用线程池。
     * 满载时降级为调用线程同步执行（CallerRunsPolicy），宁可变慢也不丢弃推送任务。
     */
    @Bean("pushplusExecutor")
    public Executor pushplusExecutor() {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        executor.setCorePoolSize(2);
        executor.setMaxPoolSize(4);
        executor.setQueueCapacity(100);
        executor.setThreadNamePrefix("pushplus-");
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        executor.setWaitForTasksToCompleteOnShutdown(true);
        executor.initialize();
        return executor;
    }
}