Extracts a ServerHandler from the Server class to reduce complexity

src/main/java/net/knarcraft/minecraftserverlauncher/server/ServerHandler.java

@@ -0,0 +1,140 @@
+package net.knarcraft.minecraftserverlauncher.server;
+
+import net.knarcraft.minecraftserverlauncher.Main;
+import net.knarcraft.minecraftserverlauncher.profile.Collection;
+import net.knarcraft.minecraftserverlauncher.profile.ServerLauncherController;
+import net.knarcraft.minecraftserverlauncher.userinterface.ServerLauncherGUI;
+
+import javax.naming.ConfigurationException;
+import java.io.BufferedWriter;
+import java.io.IOException;
+import java.util.concurrent.TimeUnit;
+
+public class ServerHandler {
+
+    /**
+     * Available ram sizes. For ServerLauncherGUI combo
+     */
+    private static final String[] ramList = {"512M", "1G", "2G", "3G", "4G", "5G", "6G", "7G", "8G", "9G", "10G",
+            "11G", "12G", "13G", "14G", "15G", "16G"};
+
+    private static boolean stoppingServers = false;
+    private static final ServerLauncherGUI gui = Main.getController().getGUI();
+
+    /**
+     * Gets the list of available RAM choices allowed
+     *
+     * @return <p>All available RAM choices</p>
+     */
+    public static String[] getRamList() {
+        return ramList;
+    }
+
+    /**
+     * Gets whether the servers are currently in the process of stopping
+     *
+     * @return <p>True if the servers are in the process of stopping.</p>
+     */
+    public static boolean stoppingServers() {
+        return stoppingServers;
+    }
+
+    /**
+     * Marks the servers as finished stopping when a stop is confirmed
+     */
+    public static void serversStopped() {
+        if (stoppingServers) {
+            stoppingServers = false;
+        }
+    }
+
+    /**
+     * Tries to stop all enabled servers
+     *
+     * @throws IOException <p>If a writer's process is already closed but not null</p>
+     */
+    public static void stop() throws IOException, InterruptedException {
+        if (stoppingServers) {
+            killServers();
+            return;
+        }
+
+        stoppingServers = true;
+        for (Collection collection : Main.getController().getCurrentProfile().getCollections()) {
+            Server server = collection.getServer();
+            BufferedWriter writer = server.getWriter();
+            if (writer != null) {
+                if (server.isProxy()) {
+                    writer.write("end\n");
+                } else {
+                    writer.write("stop\n");
+                }
+                writer.flush();
+                server.setWriter(null);
+                server.setStopped();
+            }
+        }
+        //TODO: Set stoppingServers to false if no servers are actually running
+    }
+
+    /**
+     * Kills all server processes
+     *
+     * @throws InterruptedException <p>If interrupted waiting for any of the servers to stop</p>
+     */
+    private static void killServers() throws InterruptedException {
+        for (Collection collection : Main.getController().getCurrentProfile().getCollections()) {
+            Server server = collection.getServer();
+            killServer(server);
+        }
+    }
+
+    /**
+     * Kills the given server after waiting 30 seconds for it to terminate normally
+     *
+     * @param server <p>The server to kill</p>
+     * @throws InterruptedException <p>If interrupted waiting for the server to stop</p>
+     */
+    private static void killServer(Server server) throws InterruptedException {
+        Process serverProcess = server.getProcess();
+        if (serverProcess != null) {
+            if (!serverProcess.waitFor(30, TimeUnit.SECONDS)) {
+                serverProcess.destroyForcibly();
+                serverProcess.waitFor();
+            }
+        }
+    }
+
+    /**
+     * Runs all enabled servers with their settings
+     */
+    public static void startServers() {
+        ServerLauncherController controller = Main.getController();
+        gui.setStatus("Starting servers");
+        int serverNum = 0;
+        for (Collection collection : controller.getCurrentProfile().getCollections()) {
+            if (!collection.getServer().runServer(serverNum++ == 0)) {
+                gui.showError("An error occurred. Start aborted. Please check relevant log files.");
+                try {
+                    stop();
+                } catch (IOException | InterruptedException e) {
+                    e.printStackTrace();
+                }
+                gui.updateGUIElementsWhenServersStartOrStop(false);
+                return;
+            }
+        }
+    }
+
+    /**
+     * Gets a server object from a server save string
+     *
+     * @param saveString <p>The string containing necessary data regarding the server</p>
+     * @return <p>A server in the same state it was saved in</p>
+     */
+    public static Server fromString(String saveString) throws ConfigurationException {
+        String[] data = saveString.split(";");
+        return new Server(data[0], data[1], Boolean.parseBoolean(data[2]), data[3], data[4], data[5]);
+    }
+
+}