package com.lagou.threadpool;
import org.apache.dubbo.common.URL;
import org.apache.dubbo.common.threadpool.support.fixed.FixedThreadPool;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Map;
import java.util.concurrent.*;
public class WachingThreadPool extends FixedThreadPool implements Runnable {
    private static final Logger LOGGER = LoggerFactory.getLogger(WachingThreadPool.class);
    // 定義線程池使用的閥值
    private static final double ALARM_PERCENT = 0.90;
    private final Map<URL, ThreadPoolExecutor> THREAD_POOLS = new ConcurrentHashMap<>();
    public WachingThreadPool() {
        // 每隔3秒打印線程使用情況
        Executors.newSingleThreadScheduledExecutor().scheduleWithFixedDelay(this, 1, 3, TimeUnit.SECONDS);
    }
    // 通過(guò)父類(lèi)創(chuàng)建線程池
    @Override
    public Executor getExecutor(URL url) {
        final Executor executor = super.getExecutor(url);
        if (executor instanceof ThreadPoolExecutor) {
            THREAD_POOLS.put(url, (ThreadPoolExecutor) executor);
        }
        return executor;
    }
    @Override
    public void run() {
        // 遍歷線程池
        for (Map.Entry<URL, ThreadPoolExecutor> entry : THREAD_POOLS.entrySet()) {
            final URL url = entry.getKey();
            final ThreadPoolExecutor executor = entry.getValue();
            // 計(jì)算相關(guān)指標(biāo)
            final int activeCount = executor.getActiveCount();
            final int poolSize = executor.getCorePoolSize();
            double usedPercent = activeCount / (poolSize * 1.0);
            LOGGER.info("線程池執(zhí)行狀態(tài):[{}/{}:{}%]", activeCount, poolSize, usedPercent * 100);
            if (usedPercent > ALARM_PERCENT) {
                LOGGER.error("超出警戒線! host:{} 當(dāng)前使用率是:{},URL:{}", url.getIp(), usedPercent * 100, url);
            }
        }
    }
}

package com.lagou;
import com.lagou.bean.ConsumerComponent;
import org.apache.dubbo.config.spring.context.annotation.EnableDubbo;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import java.io.IOException;
public class AnnotationConsumerMain {
    public static void main(String[] args) throws IOException, InterruptedException {
        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(ConsumerConfiguration.class);
        context.start();
        ConsumerComponent service = context.getBean(ConsumerComponent.class);
        while (true) {
            for (int i = 0; i < 1000; i++) {
                Thread.sleep(5);
                new Thread(new Runnable() {
                    @Override
                    public void run() {
                        String msg = service.sayHello("world", 0);
                        System.out.println(msg);
                    }
                }).start();
            }
        }
    }
    @Configuration
    @PropertySource("classpath:/dubbo-consumer.properties")
    //@EnableDubbo(scanBasePackages = "com.lagou.bean")
    @ComponentScan("com.lagou.bean")
    @EnableDubbo
    static class ConsumerConfiguration {
    }
}