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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);
    }

    public PollingClient(String subscribeHost, int subscribePort) throws SocketException {
        super(subscribeHost, subscribePort);
    }

    @Override
    protected boolean doReconnect(Site site) {
        try {
            Thread.sleep(1000);
            BlockingQueue> queue = subscribeInternal(site.host, site.port, site.tableName, site.actionName, null, site.msgId + 1, true, site.filter, site.allowExistTopic);
            System.out.println("Successfully reconnected and subscribed " + site.host + ":" + site.port + ":" + site.tableName);
            topicPoller.setQueue(queue);
            return true;
        } catch (Exception ex) {
            System.out.println("Unable to subscribe table. Will try again after 1 seconds.");
            ex.printStackTrace();
            return false;
        }
    }

    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, false);
        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);
    }
}