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GameServer/Contents/Room/DbQuery/DBQRoomReadTarget.cs

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+using ServerCommon;
+using ServerCore; using ServerBase;
+
+namespace GameServer.Contents.Room.DbQuery;
+
+public class DBQRoomReadTarget : QueryExecutorBase
+{
+
+    private string m_pk { get; set; } = string.Empty;
+    private string m_sk { get; set; }
+    private readonly string m_combination_key_for_pk;
+    private RoomDoc m_to_read_room_doc = new();
+
+    public DBQRoomReadTarget(string combinationKeyForPk, int room_id) : base(nameof(DBQRoomReadTarget))
+    {
+        m_combination_key_for_pk = combinationKeyForPk;
+        m_sk = room_id.ToString();
+    }
+    
+    //=====================================================================================
+    // DB 쿼리 직전에 준비해야 할 로직들을 작성한다.
+    //=====================================================================================
+    public override async Task<Result> onPrepareQuery()
+    {
+        var result = new Result();
+
+        var doc = new RoomDoc();
+        doc.setCombinationKeyForPK(m_combination_key_for_pk);
+
+        var error_code = doc.onApplyPKSK();
+        if (error_code.isFail())
+        {
+            var err_msg = $"Failed to onApplyPKSK() !!! : {error_code.toBasicString()} - {toBasicString()}";
+            result.setFail(error_code, err_msg);
+            Log.getLogger().error(result.toBasicString());
+            return result;
+        }
+
+        m_pk = doc.getPK();
+        
+        return await Task.FromResult(result);
+    }
+    
+    //=====================================================================================
+    // onPrepareQuery()를 성공할 경우 호출된다.
+    //=====================================================================================
+    public override async Task<Result> onQuery()
+    {
+        var result = new Result();
+        var err_msg = string.Empty;
+
+        var query_batch = getQueryBatch();
+        NullReferenceCheckHelper.throwIfNull(query_batch, () => $"query_batch is null !!!");
+
+        var db_connector = query_batch.getDynamoDbConnector();
+        var query_config = db_connector.makeQueryConfigForReadByPKSK(m_pk, m_sk);
+
+        (result, var read_doc) = await db_connector.simpleQueryDocTypeWithQueryOperationConfig<RoomDoc>(query_config, eventTid: query_batch.getTransId());
+        if (result.isFail()) return result;
+        
+        // todo (sangyeob.kim): DBQReadTarget에서 획득한 doc을 필요로 하는 action 으로 보내야 한다. 
+        // ....
+        
+        m_to_read_room_doc = read_doc!;
+        return await Task.FromResult(new Result());
+    }
+    
+    //=====================================================================================
+    // DB 쿼리를 성공하고, doFnCommit()가 QueryResultType.NotCalledQueryFunc를 반환할 경우 호출된다.
+    //=====================================================================================
+    public override async Task onQueryResponseCommit() => await Task.CompletedTask;
+    
+    //=====================================================================================
+    // DB 쿼리를 실패하고, doFnRollback()가 QueryResultType.NotCalledQueryFunc를 반환할 경우 호출된다.
+    //=====================================================================================
+    public override async Task onQueryResponseRollback(Result errorResult) => await Task.CompletedTask;
+}