+ added metrics

src/de/Linus122/customoregen/Main.java

@@ -51,6 +51,7 @@ public class Main extends JavaPlugin {
 
 			clogger.sendMessage("§6[CustomOreGen] §aUsing uSkyBlock as SkyBlock-Plugin");
 		}
+		new Metrics(this);
 	}
 
 	public void onDisable() {

src/de/Linus122/customoregen/Metrics.java

@@ -0,0 +1,82 @@
+package de.Linus122.customoregen;
+
+import java.io.DataOutputStream;
+import java.net.HttpURLConnection;
+import java.util.HashMap;
+
+import javax.net.ssl.HttpsURLConnection;
+
+import org.bukkit.plugin.Plugin;
+
+import com.google.gson.Gson;
+
+public class Metrics {
+	private Plugin pl;
+	private final Gson gson = new Gson();
+	
+	private String URL = "https://spaceio.de/update/%s";
+	
+	public Metrics(Plugin pl){
+		this.pl = pl;
+		URL = String.format(URL, pl.getName());
+		pl.getServer().getScheduler().runTaskTimerAsynchronously(pl, () -> {
+			String dataJson = collectData();
+			try{
+				sendData(dataJson);
+			}catch(Exception e){
+				// skip
+				//e.printStackTrace();
+			}
+		}, 20L * 5, 20L * 60 * 10);
+	}
+	private String collectData() {
+		Data data = new Data();
+
+		// collect plugin list
+		for(Plugin plug : pl.getServer().getPluginManager().getPlugins()) data.plugs.put(plug.getName(), plug.getDescription().getVersion());
+		
+		// fetch online players
+		data.onlinePlayers = pl.getServer().getOnlinePlayers().size();
+		
+		// server version
+		data.serverVersion = getVersion();
+		
+		// core count
+		data.coreCnt = Runtime.getRuntime().availableProcessors();
+		
+		// java version
+		data.javaRuntime = System.getProperty("java.runtime.version");
+		
+		// online mode
+		data.onlineMode = pl.getServer().getOnlineMode();
+
+		return gson.toJson(data);
+	}
+	private void sendData(String dataJson) throws Exception{
+		java.net.URL obj = new java.net.URL(URL);
+		HttpsURLConnection con = (HttpsURLConnection) obj.openConnection();
+
+		con.setRequestMethod("POST");
+		con.setRequestProperty("User-Agent", "Java/Bukkit");
+
+		con.setDoOutput(true);
+		DataOutputStream wr = new DataOutputStream(con.getOutputStream());
+		wr.writeBytes(dataJson);
+		wr.flush();
+		wr.close();
+		con.getResponseCode();
+	}
+	private String getVersion(){
+        String packageName = pl.getServer().getClass().getPackage().getName();
+        return  packageName.substring(packageName.lastIndexOf('.') + 1);
+	}
+	
+}
+class Data {
+	HashMap<String, String> plugs = new HashMap<String, String>();
+	int onlinePlayers;
+	String serverVersion;
+	int coreCnt;
+	String javaRuntime;
+	boolean onlineMode;
+}