package com.yihu.wlyy.statistics.config;

import java.util.concurrent.Executor;
import org.apache.tomcat.util.threads.ThreadPoolExecutor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

/**
 * Created by Administrator on 2016.10.18.
 * 启用多綫程
 */
@Configuration
@EnableAsync
public class AsyncConfig  {
    /** 如果池中的实际线程数小于corePoolSize,无论是否其中有空闲的线程，都会给新的任务产生新的线程 */
    private int corePoolSize = 5;
    /** 如果池中的线程数＝maximumPoolSize，则有空闲线程使用空闲线程，否则新任务放入queueCapacity. */
    private int maxPoolSize = 20;
    /** 缓冲队列. */
    private int queueCapacity = 10;
    @Bean
    public Executor dbExtractExecutor() {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        executor.setCorePoolSize(corePoolSize);
        executor.setMaxPoolSize(maxPoolSize);
        executor.setQueueCapacity(queueCapacity);
        // rejection-policy：当pool已经达到max size的时候，如何处理新任务
        // CALLER_RUNS：不在新线程中执行任务，而是有调用者所在的线程来执行
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        executor.initialize();
        return executor;
    }

    @Bean
    public Executor dbStorageExecutor() {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        executor.setCorePoolSize(corePoolSize);
        executor.setMaxPoolSize(maxPoolSize);
        executor.setQueueCapacity(queueCapacity);

        // rejection-policy：当pool已经达到max size的时候，如何处理新任务
        // CALLER_RUNS：不在新线程中执行任务，而是有调用者所在的线程来执行
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        executor.initialize();
        return executor;
    }
}
