AsyncConfig.java

package com.semosan.api.common.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;

@Configuration
@EnableAsync
public class AsyncConfig {

    @Bean(name = "notificationTaskExecutor")
    public Executor notificationTaskExecutor() {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        executor.setCorePoolSize(5);
        executor.setMaxPoolSize(20);
        executor.setQueueCapacity(500);
        executor.setThreadNamePrefix("notif-async-");
        // 큐 가득 차면 호출 스레드가 직접 실행 → 메시지 유실 방지
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        // executor.initialize() 호출 안 함 → Spring이 afterPropertiesSet()에서 자동 호출
        return executor;
    }

    @Bean(name = "discordAlertExecutor")
    public Executor discordAlertExecutor() {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        executor.setCorePoolSize(1);
        executor.setMaxPoolSize(2);
        executor.setQueueCapacity(50);
        executor.setThreadNamePrefix("discord-alert-");
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.DiscardPolicy());
        return executor;
    }

    @Bean(name = "authCleanupTaskExecutor")
    public Executor authCleanupTaskExecutor() {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        executor.setCorePoolSize(2);
        executor.setMaxPoolSize(8);
        executor.setQueueCapacity(200);
        executor.setThreadNamePrefix("auth-cleanup-");
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        return executor;
    }
}