New thread freezes UI thread when using Thread.join()

[Mine215]

Hey guys, I have made two classes I want to use to execute a commands. One of the classes (NickScan) is my command class and the other (NickScanRunnable) is my runnable class. I have a HTTP GET request running in my runnable class which is ran in my command class on 'processCommand()'. In my runnable class I edit a public variable to the String I want and then I use the Thread.join() method to connect to the thread and after retrieve my public variable which I then output. The problem is Thread.join() suspends my UI thread too. I was wondering if there was any other way to do this? I will attach code below.

 

NickScan class:

 

 

 

 

Spoiler

 

package com.mine215.nickscanner;

import net.minecraft.client.Minecraft;
import net.minecraft.command.CommandBase;
import net.minecraft.command.CommandException;
import net.minecraft.command.ICommandSender;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.util.ChatComponentText;

public class NickScan extends CommandBase {
    @Override
    public String getCommandName() {
        return "nickscan";
    }

    @Override
    public String getCommandUsage(ICommandSender sender) {
        return "command.searchnickscan.usage";
    }

    @Override
    public void processCommand(ICommandSender sender, String[] args) throws CommandException {
        EntityPlayer player = (EntityPlayer) Minecraft.getMinecraft().thePlayer;
        NickScanRunnable nsRunnable = new NickScanRunnable();
        Thread apiConnectThread = new Thread(nsRunnable);
        apiConnectThread.start();
        try {
            apiConnectThread.join();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        player.addChatMessage(new ChatComponentText(nsRunnable.resultToChat));
    }

    @Override
    public int getRequiredPermissionLevel() {
        return 0;
    }

    @Override
    public boolean isUsernameIndex(String[] args, int index)
    {
        return index == 0;
    }
}

 

 

NickScanRunnable class:

 

 

 

 

Spoiler

package com.mine215.nickscanner;

import net.minecraft.client.Minecraft;
import net.minecraft.client.network.NetworkPlayerInfo;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.scoreboard.ScorePlayerTeam;
import net.minecraft.util.EnumChatFormatting;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.ProtocolException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;

public class NickScanRunnable implements Runnable {
    private String apiKey = "eef99098-f636-42c7-84cf-deff39981377";
    private List<String> playerNames = new ArrayList<String>();
    public String resultToChat = "Bleh bleh bleh";

    @Override
    public void run() {
        Iterable<NetworkPlayerInfo> players = Minecraft.getMinecraft().getNetHandler().getPlayerInfoMap();
        EntityPlayer player = (EntityPlayer) Minecraft.getMinecraft().thePlayer;
        while(players.iterator().hasNext()){
            NetworkPlayerInfo element = players.iterator().next();
            String a = getPlayerName(element);
            playerNames.add(a);
        }

        for(int i = 0; i < playerNames.size(); i++) {
            URL url = null;
            try {
                url = new URL("https://api.hypixel.net/player?key=" + apiKey + "&name=" + playerNames.get(i));
            } catch (MalformedURLException e) {
                e.printStackTrace();
            }
            HttpURLConnection connection = null;
            try {
                connection = (HttpURLConnection) url.openConnection();
            } catch (IOException e) {
                e.printStackTrace();
            }

            try {
                connection.setRequestMethod("GET");
            } catch (ProtocolException e) {
                e.printStackTrace();
            }

            // To store our response
            StringBuilder content = null;

            // Get the input stream of the connection
            BufferedReader input = null;
            try {
                input = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            } catch (IOException e) {
                e.printStackTrace();
            }
            String line;
            content = new StringBuilder();
            try {
                while ((line = input.readLine()) != null) {
                    // Append each line of the response and separate them
                    content.append(line);
                    content.append(System.lineSeparator());
                }
            } catch (IOException e) {
                e.printStackTrace();
            }

            if (content.toString().length() < 33) {
                resultToChat = EnumChatFormatting.GOLD + "[NickScanner] " + EnumChatFormatting.RED + playerNames.get(i) + EnumChatFormatting.GOLD + " is a nick";
            } else {
                resultToChat = EnumChatFormatting.GOLD + "[NickScanner] " + EnumChatFormatting.DARK_GREEN + playerNames.get(i) + EnumChatFormatting.GOLD + " is not a nick";
            }
        }
    }
    public String getPlayerName(NetworkPlayerInfo networkPlayerInfoIn)
    {
        return networkPlayerInfoIn.getDisplayName() != null ? networkPlayerInfoIn.getDisplayName().getFormattedText() : ScorePlayerTeam.formatPlayerName(networkPlayerInfoIn.getPlayerTeam(), networkPlayerInfoIn.getGameProfile().getName());
    }
}

 

 

Edited May 29, 2020 by Mine215
Make it look cleaner

[Zen3515]

It's only normal for the main thread to block. I mean you join the main thread, it will be blocked until the other thread finish.

Edited May 29, 2020 by Zen3515