内存资源很宝贵,线程池资源不宜过多的创建,同一个应用,尽量使用统一的线程池,并且相关参数需要设置适当,不造成资源的浪费,也不影响性能的提升。
import java.util.concurrent.ThreadPoolExecutor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Primary;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor; /**
* @author
* @date 2019/5/21
*/
@Configuration
public class ThreadPoolConfig {
@Value("thread.pool.core.pool.size:10")
private int threadPoolCorePoolSize;
@Value("thread.pool.max.pool.size:50")
private int threadPoolMaxPoolSize;
@Value("thread.pool.queue.capacity:50")
private int threadPoolQueueCapacity;
@Value("thread.pool.keep.alive.seconds:300")
private int threadPoolKeepAliveSeconds; @Primary
@Bean
public ThreadPoolTaskExecutor threadPoolTaskExecutor() {
ThreadPoolTaskExecutor threadPoolTaskExecutor = new ThreadPoolTaskExecutor();
/** 核心线程数,默认为1 **/
threadPoolTaskExecutor.setCorePoolSize(threadPoolCorePoolSize);
/** 最大线程数,默认为Integer.MAX_VALUE **/
threadPoolTaskExecutor.setMaxPoolSize(threadPoolMaxPoolSize);
/** 队列最大长度,一般需要设置值: 大于等于notifyScheduledMainExecutor.maxNum;默认为Integer.MAX_VALUE **/
threadPoolTaskExecutor.setQueueCapacity(threadPoolQueueCapacity);
/** 线程池维护线程所允许的空闲时间,默认为60s **/
threadPoolTaskExecutor.setKeepAliveSeconds(threadPoolKeepAliveSeconds);
/**
* 线程池对拒绝任务(无线程可用)的处理策略,目前只支持AbortPolicy、CallerRunsPolicy;默认为后者
*
* AbortPolicy:直接抛出java.util.concurrent.RejectedExecutionException异常
* CallerRunsPolicy:主线程直接执行该任务,执行完之后尝试添加下一个任务到线程池中,可以有效降低向线程池内添加任务的速度
* DiscardOldestPolicy:抛弃旧的任务、暂不支持;会导致被丢弃的任务无法再次被执行
* DiscardPolicy:抛弃当前任务、暂不支持;会导致被丢弃的任务无法再次被执行
*/
threadPoolTaskExecutor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy()); return threadPoolTaskExecutor;
}
}