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The messaging and data conversion protocol between Java and DolphinDB server

There is a newer version: 1.0.27

package com.xxdb.streaming.client;

import java.util.*;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;

import com.xxdb.streaming.client.IMessage;

class QueueManager {
    private HashMap>> queueMap = new HashMap>>();

    public synchronized BlockingQueue> addQueue(String topic) {
        if (!queueMap.containsKey(topic)) {
            BlockingQueue> q = new ArrayBlockingQueue<>(4096);
            queueMap.put(topic, q);
            return q;
        }
        throw new RuntimeException("Topic " + topic + " already subscribed");
    }

    public synchronized BlockingQueue> getQueue(String topic) {
        BlockingQueue> q = queueMap.get(topic);
        return q;
    }

    public synchronized List getAllTopic() {
        java.util.Iterator its = queueMap.keySet().iterator();
        List re = new ArrayList<>();
        while (its.hasNext()) {
            re.add(its.next());
        }
        return re;
    }

    public synchronized void removeQueue(String topic) {
        queueMap.remove(topic);
    }
}