Feature - plugin watcher, detect file changes & reload

Common/src/main/java/net/frankheijden/serverutils/common/tasks/PluginWatcherTask.java

@@ -0,0 +1,97 @@
+package net.frankheijden.serverutils.common.tasks;
+
+import com.sun.nio.file.SensitivityWatchEventModifier;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.FileSystems;
+import java.nio.file.StandardWatchEventKinds;
+import java.nio.file.WatchEvent;
+import java.nio.file.WatchKey;
+import java.nio.file.WatchService;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+import net.frankheijden.serverutils.common.ServerUtilsApp;
+import net.frankheijden.serverutils.common.entities.AbstractTask;
+import net.frankheijden.serverutils.common.entities.ServerCommandSender;
+import net.frankheijden.serverutils.common.entities.ServerUtilsPlugin;
+import net.frankheijden.serverutils.common.entities.WatchResult;
+import net.frankheijden.serverutils.common.managers.AbstractPluginManager;
+import net.frankheijden.serverutils.common.managers.AbstractTaskManager;
+import net.frankheijden.serverutils.common.providers.ChatProvider;
+
+public class PluginWatcherTask extends AbstractTask {
+
+    private static final WatchEvent.Kind<?>[] EVENTS = new WatchEvent.Kind[] {
+        StandardWatchEventKinds.ENTRY_CREATE,
+        StandardWatchEventKinds.ENTRY_MODIFY,
+        StandardWatchEventKinds.ENTRY_DELETE
+    };
+
+    private final ServerUtilsPlugin plugin = ServerUtilsApp.getPlugin();
+
+    @SuppressWarnings("rawtypes")
+    private final AbstractPluginManager pluginManager = plugin.getPluginManager();
+    private final ChatProvider chatProvider = plugin.getChatProvider();
+    @SuppressWarnings("rawtypes")
+    private final AbstractTaskManager taskManager = plugin.getTaskManager();
+
+    private final ServerCommandSender sender;
+    private final String pluginName;
+    private File file;
+    private final AtomicBoolean run;
+
+    /**
+     * Constructs a new PluginWatcherTask for the specified plugin.
+     * @param pluginName The name of the plugin.
+     */
+    public PluginWatcherTask(ServerCommandSender sender, String pluginName) {
+        this.sender = sender;
+        this.pluginName = pluginName;
+        this.file = pluginManager.getPluginFile(pluginName);
+        this.run = new AtomicBoolean(true);
+    }
+
+    @Override
+    public void run() {
+        try (WatchService watchService = FileSystems.getDefault().newWatchService()) {
+            File folder = pluginManager.getPluginsFolder();
+            folder.toPath().register(watchService, EVENTS, SensitivityWatchEventModifier.HIGH);
+
+            while (run.get()) {
+                WatchKey key = watchService.take();
+                for (WatchEvent<?> event : key.pollEvents()) {
+                    if (file.getName().equals(event.context().toString())) {
+                        send(WatchResult.CHANGE);
+
+                        taskManager.runTask(() -> {
+                            pluginManager.reloadPlugin(pluginName);
+                            file = pluginManager.getPluginFile(pluginName);
+                        });
+                    }
+                }
+
+                if (file == null || !key.reset()) {
+                    send(WatchResult.STOPPED);
+                    break;
+                }
+            }
+        } catch (IOException ex) {
+            ex.printStackTrace();
+        } catch (InterruptedException ignored) {
+            //
+        }
+    }
+
+    private void send(WatchResult result) {
+        result.sendTo(sender, null, pluginName);
+        if (sender.isPlayer()) {
+            result.sendTo(chatProvider.getConsoleSender(), null, pluginName);
+        }
+    }
+
+    @Override
+    public void cancel() {
+        run.set(false);
+    }
+}