package kr.wisestone.owl.config;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.aop.interceptor.AsyncUncaughtExceptionHandler;
import org.springframework.aop.interceptor.SimpleAsyncUncaughtExceptionHandler;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.Ordered;
import org.springframework.scheduling.TaskScheduler;
import org.springframework.scheduling.annotation.AsyncConfigurer;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.annotation.SchedulingConfigurer;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
import org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler;
import org.springframework.scheduling.config.ScheduledTaskRegistrar;
import org.springframework.util.ErrorHandler;
import java.util.concurrent.RejectedExecutionHandler;
import java.util.concurrent.ThreadPoolExecutor;

/**
 * Created by jeong on 2017-07-26.
 */
@Configuration
@EnableScheduling
@EnableAsync(order= Ordered.HIGHEST_PRECEDENCE)
public class AsyncConfiguration implements AsyncConfigurer, SchedulingConfigurer {

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

    private static final String CORE_POOL_SIZE = "10";

    private static final String MAX_POOL_SIZE = "100";

    private static final String QUEUE_CAPACITY = "100000";

    @Override
    @Bean(name = "taskExecutor")
    public ThreadPoolTaskExecutor getAsyncExecutor() {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        executor.setCorePoolSize(Integer.parseInt(CORE_POOL_SIZE));
        executor.setMaxPoolSize(Integer.parseInt(MAX_POOL_SIZE));
        executor.setQueueCapacity(Integer.parseInt(QUEUE_CAPACITY));
        executor.setThreadNamePrefix("owl-Executor-");
        return executor;
    }

    @Bean
    public ThreadPoolTaskScheduler taskScheduler() {
        ThreadPoolTaskScheduler scheduler = new ThreadPoolTaskScheduler();
        scheduler.setPoolSize(20);
        scheduler.setThreadNamePrefix("task-");
        scheduler.setAwaitTerminationSeconds(60);
        scheduler.setWaitForTasksToCompleteOnShutdown(true);
        scheduler.setErrorHandler(new ErrorHandler() {
            @Override
            public void handleError(Throwable t) {
                log.error("task 실행시 알 수 없는 에러가 발생했습니다.", t);
            }
        });
        scheduler.setRejectedExecutionHandler(new RejectedExecutionHandler() {
            @Override
            public void rejectedExecution(Runnable r, ThreadPoolExecutor executor) {
                log.error("알 수 없는 이유로 task 실행이 거절되었습니다.", r);
            }
        });

        return scheduler;
    }

    @Override
    public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {
        return new SimpleAsyncUncaughtExceptionHandler();
    }

    @Override
    public void configureTasks(ScheduledTaskRegistrar taskRegistrar) {
        TaskScheduler taskScheduler = this.taskScheduler();
        taskRegistrar.setTaskScheduler(taskScheduler);
    }
}