package com.genersoft.iot.vmp.conf;
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import org.springframework.context.annotation.Bean;
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import org.springframework.context.annotation.Configuration;
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import org.springframework.core.annotation.Order;
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import org.springframework.scheduling.annotation.EnableAsync;
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import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
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import java.util.concurrent.ThreadPoolExecutor;
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/**
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* ThreadPoolTask 配置类
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* @author lin
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*/
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@Configuration
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@Order(1)
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@EnableAsync(proxyTargetClass = true)
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public class ThreadPoolTaskConfig {
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public static final int cpuNum = Runtime.getRuntime().availableProcessors();
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/**
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* 默认情况下，在创建了线程池后，线程池中的线程数为0，当有任务来之后，就会创建一个线程去执行任务，
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* 当线程池中的线程数目达到corePoolSize后，就会把到达的任务放到缓存队列当中；
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* 当队列满了，就继续创建线程，当线程数量大于等于maxPoolSize后，开始使用拒绝策略拒绝
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*/
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/**
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* 核心线程数（默认线程数）
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*/
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private static final int corePoolSize = cpuNum;
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/**
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* 最大线程数
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*/
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private static final int maxPoolSize = cpuNum*2;
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/**
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* 允许线程空闲时间（单位：默认为秒）
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*/
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private static final int keepAliveTime = 30;
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/**
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* 缓冲队列大小
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*/
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private static final int queueCapacity = 10000;
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/**
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* 线程池名前缀
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*/
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private static final String threadNamePrefix = "wvp-";
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/**
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*
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* @return
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*/
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@Bean("taskExecutor") // bean的名称，默认为首字母小写的方法名
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public ThreadPoolTaskExecutor taskExecutor() {
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ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
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executor.setCorePoolSize(corePoolSize);
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executor.setMaxPoolSize(maxPoolSize);
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executor.setQueueCapacity(queueCapacity);
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executor.setKeepAliveSeconds(keepAliveTime);
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executor.setThreadNamePrefix(threadNamePrefix);
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// 线程池对拒绝任务的处理策略
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// CallerRunsPolicy：由调用线程（提交任务的线程）处理该任务
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executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
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// 初始化
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executor.initialize();
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return executor;
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}
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}
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