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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 com.xxdb.data.Vector;
import com.xxdb.streaming.client.IMessage;

import java.io.IOException;
import java.net.SocketException;
import java.util.List;
import java.util.concurrent.BlockingQueue;

public class PollingClient extends AbstractClient{
	TopicPoller topicPoller = null;

    public PollingClient(int subscribePort) throws SocketException {
        super(subscribePort);
    }
    
    @Override
    protected void doReconnect(Site site) {
    	while (true) {
    		try {
				Thread.sleep(5000);
    			BlockingQueue> queue = subscribeInternal(site.host, site.port, site.tableName, site.actionName, null, site.msgId + 1, true, site.filter);
				System.out.println("Successfully reconnected and subscribed " + site.host + ":" + site.port + ":" + site.tableName);
    			topicPoller.setQueue(queue);
    			return;
    		} catch (Exception ex) {
				System.out.println("Unable to subscribe table. Will try again after 5 seconds.");
				ex.printStackTrace();
    		}
    	}
    }
    
    public TopicPoller subscribe(String host,int port,String tableName,String actionName,long offset,boolean reconnect,Vector filter) throws IOException{
    	BlockingQueue> queue = subscribeInternal(host,port,tableName,actionName,null,offset,reconnect,filter);
    	topicPoller = new TopicPoller(queue);
    	return topicPoller;
	}
    
    public TopicPoller subscribe(String host,int port,String tableName,String actionName,long offset,boolean reconnect) throws IOException{
    	return subscribe(host,port,tableName,actionName,offset,reconnect,null);
	}
    
    public TopicPoller subscribe(String host,int port,String tableName,String actionName,long offset,Vector filter) throws IOException{
        return subscribe(host,port,tableName,actionName,offset,false,filter);
    }

    public TopicPoller subscribe(String host,int port,String tableName,String actionName,long offset) throws IOException{
        return subscribe(host,port,tableName,actionName,offset,false);
    }

    public TopicPoller subscribe(String host,int port,String tableName,long offset) throws IOException{
        return subscribe(host,port,tableName,DEFAULT_ACTION_NAME,offset);
    }
    
    public TopicPoller subscribe(String host,int port,String tableName,long offset,boolean reconnect) throws IOException{
        return subscribe(host,port,tableName,DEFAULT_ACTION_NAME,offset,reconnect);
    }

	public TopicPoller subscribe(String host,int port,String tableName) throws IOException{
        return subscribe(host, port, tableName, -1);
    }
    
    public TopicPoller subscribe(String host,int port,String tableName,boolean reconnect) throws IOException{
        return subscribe(host, port, tableName, -1, reconnect);
    }

    public TopicPoller subscribe(String host,int port,String tableName,String actionName) throws IOException{
        return subscribe(host, port, tableName,actionName, -1);
    }
    
    public TopicPoller subscribe(String host,int port,String tableName,String actionName,boolean reconnect) throws IOException{
        return subscribe(host, port, tableName,actionName, -1, reconnect);
    }
    
    public void unsubscribe(String host,int port,String tableName,String actionName) throws IOException {
        unsubscribeInternal(host, port, tableName,actionName);
    }
    
    public void unsubscribe(String host,int port ,String tableName) throws IOException {
        unsubscribeInternal(host, port, tableName,DEFAULT_ACTION_NAME);
    }
}