#704 Implement reloading via injector

- Create interfaces Reloadable and SettingsDependent to recognize reloadable classes
- Iterate through instances in injector to reload

src/main/java/fr/xephi/authme/initialization/AuthMeServiceInitializer.java

@@ -2,6 +2,7 @@ package fr.xephi.authme.initialization;
 
 import com.google.common.base.Preconditions;
 import com.google.common.collect.ImmutableSet;
+import fr.xephi.authme.settings.NewSetting;
 
 import javax.annotation.PostConstruct;
 import javax.inject.Provider;
@@ -122,6 +123,26 @@ public class AuthMeServiceInitializer {
         return object;
     }
 
+    /**
+     * Performs a reload on all applicable instances which are registered.
+     * Requires that the {@link NewSetting settings} instance be registered.
+     * <p>
+     * Note that the order in which these classes are reloaded is not guaranteed.
+     */
+    public void performReloadOnServices() {
+        NewSetting settings = (NewSetting) objects.get(NewSetting.class);
+        if (settings == null) {
+            throw new IllegalStateException("Settings instance is null");
+        }
+        for (Object object : objects.values()) {
+            if (object instanceof Reloadable) {
+                ((Reloadable) object).reload();
+            } else if (object instanceof SettingsDependent) {
+                ((SettingsDependent) object).loadSettings(settings);
+            }
+        }
+    }
+
     /**
      * Instantiates the given class by locating an @Inject constructor and retrieving
      * or instantiating its parameters.

src/main/java/fr/xephi/authme/initialization/Reloadable.java

@@ -0,0 +1,13 @@
+package fr.xephi.authme.initialization;
+
+/**
+ * Interface for reloadable entities.
+ */
+public interface Reloadable {
+
+    /**
+     * Performs the reload action.
+     */
+    void reload();
+
+}

src/main/java/fr/xephi/authme/initialization/SettingsDependent.java

@@ -0,0 +1,16 @@
+package fr.xephi.authme.initialization;
+
+import fr.xephi.authme.settings.NewSetting;
+
+/**
+ * Interface for classes that keep a local copy of certain settings.
+ */
+public interface SettingsDependent {
+
+    /**
+     * Loads the needed settings.
+     *
+     * @param settings the settings instance
+     */
+    void loadSettings(NewSetting settings);
+}