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package com.cnabc.base.threadpool.config;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;


@Configuration
public class ThreadPoolTaskExecutorConfig {
    /**
     * 参数初始化
     */
    private static final int CPU_COUNT = Runtime.getRuntime().availableProcessors();
    /**
     * 核心线程数量大小
     */
    private static final int CORE_POOL_SIZE = Math.max(2, Math.min(CPU_COUNT - 1, 4));

    @Value("${spring.application.name:cnabc}")
    private String threadGroupName;
    @Value("${thread.pool.namePrefix}")
    private String threadNamePrefix;
    /**
     * 线程池最大容纳线程数
     */
    @Value("${thread.pool.maxSize:0}")
    private int maxSize;
    /**
     * 线程空闲后的存活时长
     */
    @Value("${thread.pool.keepAliveTime:30}")
    private int keepAliveTime;

    @Bean
    public ThreadPoolTaskExecutor initExecutor() {
        ThreadPoolTaskExecutor taskExecutor = new ThreadPoolTaskExecutor();
        taskExecutor.setCorePoolSize(CORE_POOL_SIZE);
        taskExecutor.setMaxPoolSize(getMaximumPoolSize());
        taskExecutor.setQueueCapacity(1000);
        taskExecutor.setKeepAliveSeconds(keepAliveTime);
        taskExecutor.setWaitForTasksToCompleteOnShutdown(true);
        taskExecutor.initialize();
        taskExecutor.setThreadGroupName(threadGroupName);
        taskExecutor.setThreadNamePrefix(threadNamePrefix);
        return taskExecutor;
    }

    private int getMaximumPoolSize() {
        return this.maxSize == 0 ? (CPU_COUNT * 2 + 1) : maxSize;
    }
}