Add plugin loading.

api/src/main/java/net/md_5/bungee/api/ProxyServer.java

@@ -5,12 +5,21 @@ import com.google.common.base.Preconditions;
 import java.util.Collection;
 import java.util.logging.Logger;
 import lombok.Getter;
+import org.yaml.snakeyaml.Yaml;
 
 public abstract class ProxyServer
 {
 
     @Getter
     private static ProxyServer instance;
+    private ThreadLocal<Yaml> yaml = new ThreadLocal<Yaml>()
+    {
+        @Override
+        protected Yaml initialValue()
+        {
+            return new Yaml();
+        }
+    };
 
     /**
      * Sets the proxy instance. This method may only be called once per an
@@ -25,6 +34,16 @@ public abstract class ProxyServer
         ProxyServer.instance = instance;
     }
 
+    /**
+     * Gets a reusable, thread safe {@link Yaml} instance.
+     *
+     * @return an {@link Yaml} instance
+     */
+    public Yaml getYaml()
+    {
+        return yaml.get();
+    }
+
     /**
      * Gets the name of the currently running proxy software.
      *
@@ -39,14 +58,6 @@ public abstract class ProxyServer
      */
     public abstract String getVersion();
 
-    /**
-     * The current number of players connected to this proxy. This total should
-     * include virtual players that may be connected from other servers.
-     *
-     * @return current player count
-     */
-    public abstract int playerCount();
-
     /**
      * Gets the main logger which can be used as a suitable replacement for
      * {@link System#out} and {@link System#err}.

api/src/main/java/net/md_5/bungee/api/plugin/Plugin.java

@@ -1,7 +1,6 @@
 package net.md_5.bungee.api.plugin;
 
-import java.util.logging.Logger;
+import lombok.Getter;
-import net.md_5.bungee.api.ProxyServer;
 
 /**
  * Represents any Plugin that may be loaded at runtime to enhance existing
@@ -10,12 +9,8 @@ import net.md_5.bungee.api.ProxyServer;
 public class Plugin
 {
 
-    /**
+    @Getter
-     * Called when this plugin is loaded.
+    private PluginDescription description;
-     */
-    public void onLoad()
-    {
-    }
 
     /**
      * Called when this plugin is enabled.
@@ -30,4 +25,14 @@ public class Plugin
     public void onDisable()
     {
     }
+
+    /**
+     * Called by the loader to initialize the fields in this plugin.
+     *
+     * @param description the description that describes this plugin
+     */
+    final void init(PluginDescription description)
+    {
+        this.description = description;
+    }
 }

api/src/main/java/net/md_5/bungee/api/plugin/PluginDescription.java

@@ -10,5 +10,4 @@ public class PluginDescription
     private final String main;
     private final String version;
     private final String author;
-    private final String id;
 }

api/src/main/java/net/md_5/bungee/api/plugin/PluginManager.java

@@ -4,9 +4,16 @@ import com.google.common.base.Preconditions;
 import com.google.common.eventbus.EventBus;
 import com.google.common.eventbus.Subscribe;
 import java.io.File;
+import java.io.InputStream;
+import java.net.URL;
+import java.net.URLClassLoader;
 import java.util.Collection;
 import java.util.HashMap;
 import java.util.Map;
+import java.util.jar.JarEntry;
+import java.util.jar.JarFile;
+import java.util.logging.Level;
+import net.md_5.bungee.api.ProxyServer;
 
 /**
  * Class to manage bridging between plugin duties and implementation duties, for
@@ -40,15 +47,35 @@ public class PluginManager
     }
 
     /**
-     * Load a plugin from the specified file. This file must be in jar or zip
+     * Load a plugin from the specified file. This file must be in jar format.
-     * format.
      *
      * @param file the file to load from
+     * @throws Exception Any exceptions encountered when loading a plugin from
+     * this file.
      */
-    public void load(File file)
+    public void load(File file) throws Exception
     {
         Preconditions.checkNotNull(file, "file");
         Preconditions.checkArgument(file.isFile(), "Must load from file");
+
+        try (JarFile jar = new JarFile(file))
+        {
+            JarEntry pdf = jar.getJarEntry("plugin.yml");
+            try (InputStream in = jar.getInputStream(pdf))
+            {
+                PluginDescription desc = ProxyServer.getInstance().getYaml().loadAs(in, PluginDescription.class);
+                URLClassLoader loader = new URLClassLoader(new URL[]
+                        {
+                            file.toURI().toURL()
+                        });
+                Class<?> main = loader.loadClass(desc.getMain());
+                Plugin plugin = (Plugin) main.getDeclaredConstructor().newInstance();
+
+                plugin.init(desc);
+                plugins.put(pdf.getName(), plugin);
+                plugin.onEnable();
+            }
+        }
     }
 
     /**
@@ -64,8 +91,14 @@ public class PluginManager
         for (File file : folder.listFiles())
         {
             if (file.getName().endsWith(".jar"))
+            {
+                try
                 {
                     load(file);
+                } catch (Exception ex)
+                {
+                    ProxyServer.getInstance().getLogger().log(Level.WARNING, "Could not load plugin from file " + file, ex);
+                }
             }
         }
     }