package com.webmanage.config;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.aop.interceptor.AsyncUncaughtExceptionHandler;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.AsyncConfigurer;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

import javax.annotation.Resource;
import java.lang.reflect.Method;
import java.util.concurrent.Executor;
import java.util.concurrent.ThreadPoolExecutor;

@Configuration
public class AsyncConfig implements AsyncConfigurer {

    private static final Logger log = LoggerFactory.getLogger(AsyncConfig.class);

    @Resource
    private AsyncExecutorProperties properties;

    @Override
    @Bean("asyncExecutor")
    public Executor getAsyncExecutor() {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        executor.setCorePoolSize(properties.getCorePoolSize());
        executor.setMaxPoolSize(properties.getMaxPoolSize());
        executor.setQueueCapacity(properties.getQueueCapacity());
        executor.setKeepAliveSeconds(properties.getKeepAliveSeconds());
        executor.setThreadNamePrefix(properties.getThreadNamePrefix());
        executor.setWaitForTasksToCompleteOnShutdown(properties.isWaitForTasksToCompleteOnShutdown());
        executor.setAwaitTerminationSeconds(properties.getAwaitTerminationSeconds());
        // 饱和策略：调用方线程执行，避免任务被丢弃
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        executor.initialize();
        return executor;
    }

    @Override
    public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {
        return new AsyncUncaughtExceptionHandler() {
            @Override
            public void handleUncaughtException(Throwable ex, Method method, Object... params) {
                log.error("异步任务执行异常, method={}, params={}", method, params, ex);
            }
        };
    }
}