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; } }