redis多级hash redis多级优先级队列

普通队列

说明

利用list 的push 和pop命令

代码

public class Charpter06_3 {
    public static void main(String[] args)
            throws Exception {
        Jedis conn = new Jedis("127.0.0.1", 6379);
        conn.flushDB();
        //消费消息
        new Thread(new Runnable() {
            @Override
            public void run() {
                Jedis conn = new Jedis("127.0.0.1", 6379);
                watch_work_queue(conn);
            }
        }).start();
        //模拟发送10个消息
        for(int i=0;i<10;i++){
            addWork(conn,"{\"id\":"+i+"}");
        }
    }

    /**
     * 入队
     * @param conn
     * @param json
     */
    public static void  addWork(Jedis conn,String json){
       conn.rpush("work:queue",json);
    }

    /**
     * 消费
     * @param conn
     */
    public static void  watch_work_queue(Jedis conn){
        while (true){
            //当没有任务阻塞3秒
            List<String> jsons= conn.blpop(3,"work:queue");
            if(jsons==null||jsons.size()<=0){
                //让出cpu
                Thread.yield();
                continue;
            }
            System.out.println(jsons.get(1));
        }
    }
}

优先级队列

说明

不同优先级 加入到不同的list,消费的时候优先消费优先级高的

代码

public class Charpter06_4 {
    public static void main(String[] args)
            throws Exception {
        Jedis conn = new Jedis("127.0.0.1", 6379);
        conn.flushDB();
       //假定有10个优先级
        for (int i = 0; i < 10; i++) {
            prioritizations.add(i);
        }
        //倒序
        prioritizations = (TreeSet) prioritizations.descendingSet();
        for (int i = 0; i < 10; i++) {
            addWork(conn, "{\"id\":" + i + "}", i);
        }

        /**
         * 消费消息
         */
        new Thread(new Runnable() {
            @Override
            public void run() {
                Jedis conn = new Jedis("127.0.0.1", 6379);
                watch_work_queue(conn);
            }
        }).start();


    }

    private static TreeSet<Integer> prioritizations = new TreeSet();


    /**
     *
     * @param conn
     * @param json
     * @param prioritization 优先级
     */
    public static void addWork(Jedis conn, String json, Integer prioritization) {
        //不同的优先级放到不同队列
        conn.rpush("work:queue" + prioritization, json);
    }

    public static void watch_work_queue(Jedis conn) {
        while (true) {
            //格局优先级 优先消费优先级高的
            for (Integer p :
                    prioritizations) {
                //当没有任务阻塞3秒
                String json = conn.rpop("work:queue" + p);
                if (json == null) {
                    continue;
                }
                System.out.println(json);
                break;
            }

        }
    }
}

延迟队列

说明

如果入队设置了延迟时间，则计算消费时间并放入zset，

1.开启一个线程根据zset的 zrangeByScore方法获得到了消费时间的消息，并放入 push到list

2.开启一个线程消费list

代码

public class Charpter06_5 {

    public static void main(String[] args)
            throws Exception {
        Jedis conn = new Jedis("127.0.0.1", 6379);
        conn.flushDB();
        //模拟数据
        for (int i = 0; i < 10; i++) {
            addWork(conn, "{\"id\":" + i + "}", i);
        }
        //开启线程pop数据
        new Thread(new Runnable() {
            @Override
            public void run() {
                Jedis conn = new Jedis("127.0.0.1", 6379);
                watch_work_queue(conn);
            }
        }).start();
        //开启线程 将zset到了时间的放入list
        Thread th = new Thread(new Runnable() {
            @Override
            public void run() {
                Jedis conn2 = new Jedis("127.0.0.1", 6379);
                try {
                    watch_delayed_work_push_queue(conn2);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        });
        th.start();
        th.join();
        System.out.println("exit");


    }

    /**
     * @param conn
     * @param json
     * @param time 延迟时间  秒
     */
    public static void addWork(Jedis conn, String json, Integer time) {
        if (time > 0) {
            conn.zadd("work:queue:delayed", System.currentTimeMillis() + time * 1000, json);
        } else {
            conn.rpush("work:queue", json);
        }
    }

    public static void watch_work_queue(Jedis conn) {
        while (true) {

            //当没有任务阻塞3秒
            List<String> jsons = conn.brpop(3,"work:queue");
            if (jsons == null||jsons.size()<=0) {
                continue;
            }
            System.out.println(jsons.get(1));
        }

    }

    public static void watch_delayed_work_push_queue(Jedis conn) throws InterruptedException {
        while (true) {
            //当没有任务阻塞3秒 每次取一个
            Set<String> jsons = conn.zrangeByScore("work:queue:delayed", 0, System.currentTimeMillis(), 0, 1);
            if (jsons == null || jsons.size() <= 0) {
                Thread.sleep(1000);
                continue;
            }
            String item = jsons.iterator().next();
            conn.rpush("work:queue", item);
            conn.zrem("work:queue:delayed", item);
        }

    }
}