JAVA流控及超流控後的延遲處置實例

JAVA流控及超流控後的延遲處置實例。本站提示廣大學習愛好者：（JAVA流控及超流控後的延遲處置實例）文章只能為提供參考，不一定能成為您想要的結果。以下是JAVA流控及超流控後的延遲處置實例正文

本文實例講述了JAVA流控及超流控後的延遲處置辦法。分享給年夜家供年夜家參考。詳細完成辦法以下：

流控檢討（每半秒累計，是以最小留空閥值只能做到每秒2條）：

import java.text.SimpleDateFormat;
import java.util.Date;
import java.lang.Thread;
 
/**
 * 流量掌握
 *
 * @author chenx
 */
public class OverflowController {
 
    private int maxSendCountPerSecend; // 該條鏈路下流控閥值
    private Date sendTime = new Date();
    private int sendCount = 0; // 該條鏈路上發送的數目
 
    public OverflowController(int maxSendCountPerSecend) {
        if (maxSendCountPerSecend < 2) {
            maxSendCountPerSecend = 2;
        }
 
        this.maxSendCountPerSecend = maxSendCountPerSecend;
    }
 
    public int getMaxSendCountPerSecend() {
        if (getMilliseconds(new Date()) >= 500) {
            return maxSendCountPerSecend / 2;
        }
 
        return maxSendCountPerSecend - (maxSendCountPerSecend / 2);
    }
 
    /**
     * 能否超流控
     */
    public boolean isOverflow(int sendNum) {
        synchronized (this) {
            Date now = new Date();
            if (now.getTime() - sendTime.getTime() >= 500) {
                sendTime = now;
                sendCount = sendNum;
            } else {
                if (sendCount + sendNum > getMaxSendCountPerSecend()) {
                    return true;
                } else {
                    sendCount += sendNum;
                }
            }
 
            return false;
        }
    }
 
    /**
     * 獲得指准時間的毫秒數
     */
    private int getMilliseconds(Date date) {
        SimpleDateFormat df = new SimpleDateFormat("SSS");
        return Integer.valueOf(df.format(date));
    }
 
    public static void main(String[] args) throws InterruptedException {
        OverflowController oc = new OverflowController(50);
        SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss:SSS");
        for (int i = 0; i <= 100; i++) {
            if (oc.isOverflow(1)) {
                System.out.println(i + "-isOverflow-" + df.format(new Date()));
            } else {
                System.out.println(i + "-sendOk-" + df.format(new Date()));
            }
 
            Thread.sleep(10);
        }
    }
}
超流控後的延遲處置，因為java中沒有.net的“延遲拜托”一說：
ThreadPool.RegisterWaitForSingleObject(
 WaitHandle waitObject,
      WaitOrTimerCallback callBack,
      Object state,
     int millisecondsTimeOutInterval,
     bool executeOnlyOnce
)

Java下需完成一個簡略的延遲隊列：

import java.util.concurrent.Delayed;
import java.util.concurrent.TimeUnit;
 
public class DelayEntry implements Delayed {
 
    private int count;
    private long dequeuedTimeMillis; // 出隊列時光
 
    public int getCount() {
        return count;
    }
 
    public void setCount(int count) {
        this.count = count;
    }
 
    public long getDequeuedTimeMillis() {
        return dequeuedTimeMillis;
    }
 
    public DelayEntry(long delayMillis) {
        dequeuedTimeMillis = System.currentTimeMillis() + delayMillis;
    }
 
    @Override
    public int compareTo(Delayed o) {
        DelayEntry de = (DelayEntry) o;
        long timeout = dequeuedTimeMillis - de.dequeuedTimeMillis;
        return timeout > 0 ? 1 : timeout < 0 ? -1 : 0;
    }
 
    @Override
    public long getDelay(TimeUnit unit) {
        return dequeuedTimeMillis - System.currentTimeMillis();
    }
}
 
import java.util.concurrent.DelayQueue;
 
public class DelayService {
 
    public void run() {
        DelayQueue<DelayEntry> queue = new DelayQueue<DelayEntry>();
        DelayConsumer delayConsumer = new DelayConsumer(queue);
        delayConsumer.start();
 
        for (int i = 0; i < 100; i++) {
            DelayEntry de = new DelayEntry(5000);
            de.setCount(i);
            System.out.println(System.currentTimeMillis() + "--------" + de.getCount());
            queue.add(de);
        }
    }
 
    class DelayConsumer extends Thread {
        DelayQueue<DelayEntry> queue;
        public DelayConsumer(DelayQueue<DelayEntry> queue) {
            this.queue = queue;
        }
 
        public void run() {
            while (true) {
                try {
                    DelayEntry de = queue.take();
                    System.out.println("queue size=" + queue.size());
                    System.out.println(de.getCount());
                    System.out.println(System.currentTimeMillis());
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    }
 
    public static void main(String[] args) {
        DelayService ds = new DelayService();
        ds.run();
    }
}

願望本文所述對年夜家的Java法式設計有所贊助。