Implement Finale Echoing (Permanent)

- Sweeps and quests this game mode are not implemented yet

src/main/java/emu/nebula/server/handlers/HandlerJointDrillRankReq.java

@@ -0,0 +1,54 @@
+package emu.nebula.server.handlers;
+
+import emu.nebula.net.NetHandler;
+import emu.nebula.net.NetMsgId;
+import emu.nebula.proto.JointDrillRank.JointDrillRankInfo;
+import emu.nebula.net.HandlerId;
+import emu.nebula.Nebula;
+import emu.nebula.game.activity.type.JointDrillActivity;
+import emu.nebula.net.GameSession;
+
+@HandlerId(NetMsgId.joint_drill_rank_req)
+public class HandlerJointDrillRankReq extends NetHandler {
+
+    @Override
+    public byte[] handle(GameSession session, byte[] message) throws Exception {
+        // Get joint drill activity
+        var activity = session.getPlayer().getActivityManager().getFirstActivity(JointDrillActivity.class);
+        
+        if (activity == null) {
+            return session.encodeMsg(NetMsgId.joint_drill_rank_failed_ack);
+        }
+        
+        // Build response
+        var rsp = JointDrillRankInfo.newInstance()
+                .setLastRefreshTime(Nebula.getCurrentServerTime());
+        
+        // Get self
+        var self = activity.getRankEntry();
+        
+        if (self != null) {
+            rsp.setSelf(self.toProto());
+        }
+        
+        // Get ranking
+        var ranking = Nebula.getGameContext().getJointDrillModule().getRanking(activity.getId());
+        
+        for (var entry : ranking) {
+            // Check self
+            if (self != null && self.getPlayerUid() == entry.getId()) {
+                rsp.getMutableSelf().setRank(entry.getRank());
+            }
+            
+            // Add to ranking
+            rsp.addRank(entry);
+        }
+        
+        // Set total
+        rsp.setTotal(ranking.size());
+        
+        // Encode and send
+        return session.encodeMsg(NetMsgId.joint_drill_rank_succeed_ack, rsp);
+    }
+
+}