阻塞队列的简易实现

时间:2020-09-16
本文章向大家介绍阻塞队列的简易实现,主要包括阻塞队列的简易实现使用实例、应用技巧、基本知识点总结和需要注意事项,具有一定的参考价值,需要的朋友可以参考一下。
/**
* 业务场景:
* 查看数据库办件的推送情况
* 推送限时为60秒
* 如果60秒内被推送出去,数据库状态为1
* 没被推送过为0
* 超过60秒失效为-1
* (推送过的不考虑,只实现未推送的,和超时的
* 以及服务器重启后从新加入队列的处理)
*=======随便瞎写,欢迎指点======
*/

入口 类:
package com...delayQueue;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;


@Controller
public class DelayQueueController {

    private static final String SUCCESS = "seccess";
    private static final String FAILUER = "failure";

    @Autowired
    private DelayQueueSave pDelayQueueSave;

    /**
     * http://localhost:8080/submit?Number=5
     * 接收5个请求,数据库生成5条办件
     * @param Number
     * @return
     */
    @RequestMapping("/submit")
    @ResponseBody
    public String saveUser(@RequestParam("Number")int Number){
        pDelayQueueSave.insert(Number);
        return SUCCESS;
    }

}

 

数据库处理 类:

package com...delayQueue;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import wfc.service.database.RecordSet;
import wfc.service.database.SQL;
import javax.annotation.PostConstruct;
import java.sql.Timestamp;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Random;

@Service
public class DelayQueueSave {

    @Autowired
    private DelayQueueService delayQueueService;

    public final static String UNPAY = "0";//未推送
    public final static String PAYED = "1";//已推送
    public final static String EXPIRED = "-1";//已过期


    public void insert(int Number) {

        for(int i=0;i<Number;i++) {

                Long time = new Date().getTime();
                Long times = time+60000;
//                Random random = new Random();
//                long expireTime = random.nextInt(20)+5;//超时时长,单位秒5~25
                long expireTime = 60;//超时时长,单位秒60
                //数据库的 保存和过期时间
                Timestamp saveTime=new Timestamp(time);
                Timestamp saveTimes=new Timestamp(times);
                String ST_FJ_ID = time+"_"+expireTime+"_S";//业务编号
                String insertSql = "insert into DANGAN_FJ(ST_FJ_ID,DANGAN_TYPE,TIME,TIMES) values (?,?,?,?)";
                Object[] insertObject = new Object[] {ST_FJ_ID,UNPAY,saveTime,saveTimes};
                SQL.execute(insertSql,insertObject);
                System.out.println("SQL添加标志....");

                /*进行延时处理*/
                delayQueueService.Delay(ST_FJ_ID,expireTime);
        }

    }

    //服务重启的处理
    @PostConstruct
    public void initDelay(){

        System.out.println("开始扫描未推送的办件....");
        String type = "0";
        String insertSql = "select * from DANGAN_FJ where DANGAN_TYPE = ? ";
        Object[] insertObject = new Object[] {type};
        RecordSet rs = SQL.execute(insertSql,insertObject);
        List <String>list0 = new ArrayList<String>();
        List <String>list1 = new ArrayList<String>();
        while (rs.next()){
            String ST_FJ_ID = rs.getString("ST_FJ_ID");
            Timestamp saveTime = rs.getTimestamp("TIME");
            Timestamp saveTime2 = rs.getTimestamp("TIMES");
            list0.add(ST_FJ_ID);
            Long time = new Date().getTime();
            Long times = saveTime2.getTime();
            //未过期的从新放入队列,并计算超时时间
            if(times-time>0){
                list1.add(ST_FJ_ID);
                Long expireTime = (times-time)/1000;
                System.out.println("未过期未推送办件:"+ST_FJ_ID);
                System.out.println("剩余过期时间:"+expireTime);
                //放入延迟队列
                delayQueueService.Delay(ST_FJ_ID,expireTime);
            }else{
                //已过期的直接改
                String updateSql = "update dangan_fj set dangan_type =-1 where st_fj_id = ? ";
                Object[] updateObject = new Object[]{ST_FJ_ID};
                RecordSet updateRs = SQL.execute(updateSql, updateObject);
                int number = updateRs.TOTAL_RECORD_COUNT;
                //影响行数
                System.out.println("已过期的直接改-->办件编号为:"+ST_FJ_ID+"   办件过期更改影响行数:  " + number);
            }
        }
        System.out.println(String.format("总共有 "+list0.size()+" 条未推送办件....."));
        System.out.println(String.format("总共有 "+list1.size()+" 条未过期未推送办件....."));

    }


}

 

队列处理 类:

package com...delayQueue;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import java.util.concurrent.DelayQueue;

@Service
public class DelayQueueService {

    @Autowired
    private ProcessToId processToId;
    /*负责保存限时推送办件的队列*/
    private static DelayQueue<DelayQueues<String>> delay
            = new DelayQueue<DelayQueues<String>>();


    /*任务放入延迟队列*/
    public void Delay(String ST_FJ_ID,Long expireTime){
        DelayQueues<String> delayQueues = new DelayQueues<String>(expireTime,ST_FJ_ID);
        delay.put(delayQueues);
        System.out.println("[办件超时时长:"+expireTime+"秒]被推入本地检查队列,办件编号:" +ST_FJ_ID);
    }

    private class TaskSend implements Runnable{

        private ProcessToId processToId;

        public TaskSend(ProcessToId processToId){
            super();
            this.processToId = processToId;
        }

        @Override
        public void run() {

            System.out.println("启动 处理未推送数据线程......");
            while (!Thread.currentThread().isInterrupted()){
                try {
                    DelayQueues<String> delayQueues = delay.take();
                    if(delayQueues!=null){
                        processToId.doProcess(delayQueues.getData());
                    }
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
            System.out.println("关闭 处理未推送数据线程......");
        }
    }

    /*处理到期办件的线程*/
    private Thread thread;

    @PostConstruct
    public void init(){
        thread = new Thread(new TaskSend(processToId));
        thread.start();
    }

    @PreDestroy
    public void close(){
        thread.interrupt();
    }


}

 

队列实现类:

package com...delayQueue;

import java.util.concurrent.Delayed;
import java.util.concurrent.TimeUnit;

public class DelayQueues<T> implements Delayed {

    /*到期时刻  */
    private long activeTime;
    /*业务数据,泛型*/
    private T data;

    public long getActiveTime() {
        return activeTime;
    }

    public T getData() {
        return data;
    }


    public DelayQueues(Long activeTime, T data){
        super();
        this.activeTime = activeTime*1000+System.currentTimeMillis();
        this.data = data;
    }


    /**
     * 返回元素到激活时刻的剩余时长
     */
    public long getDelay(TimeUnit unit) {
        long d = unit.convert(this.activeTime
                - System.currentTimeMillis(),unit);
        return d;
    }

    /**按剩余时间排序*/
    public int compareTo(Delayed o) {
        long d = (getDelay(TimeUnit.MILLISECONDS)
                -o.getDelay(TimeUnit.MILLISECONDS));
        if (d==0){
            return 0;
        }else{
            if (d<0){
                return -1;
            }else{
                return  1;
            }
        }
    }


}

 

 

改数据库 操作:

package com...delayQueue;


import org.springframework.stereotype.Service;
import wfc.service.database.RecordSet;
import wfc.service.database.SQL;

@Service
public class ProcessToId {


    public void doProcess(String ST_FJ_ID){

        String insertSql = "select * from DANGAN_FJ where ST_FJ_ID = ? ";
        Object[] insertObject = new Object[] {ST_FJ_ID};
        RecordSet rs = SQL.execute(insertSql,insertObject);

        String type="";
        while (rs.next()){
            type = rs.getString("DANGAN_TYPE");
        }
        if(type.equals(DelayQueueSave.UNPAY)){

            System.out.println("办件【"+ST_FJ_ID+"】已过期,需要更改为过期办件!");

            String updateSql = "update dangan_fj set dangan_type =-1 where st_fj_id = ? ";
            Object[] updateObject = new Object[]{ST_FJ_ID};
            RecordSet updateRs = SQL.execute(updateSql, updateObject);
            int number = updateRs.TOTAL_RECORD_COUNT;
            //影响行数
            System.out.println("办件过期更改影响行数:  " + number+"   办件编号为:"+ST_FJ_ID);
        }

    }





}

 

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