1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 package org.apache.shardingsphere.proxy.frontend.command.executor;
19
20 import org.apache.shardingsphere.db.protocol.packet.DatabasePacket;
21
22 import java.sql.SQLException;
23 import java.util.Collection;
24
25 /**
26 * Command executor.
27 */
28 public interface CommandExecutor {
29
30 /**
31 * Execute command.
32 *
33 * @return database packets to be sent
34 * @throws SQLException SQL exception
35 */
36 Collection<DatabasePacket> execute() throws SQLException;
37
38 /**
39 * Close command executor.
40 *
41 * @throws SQLException SQL exception
42 */
43 default void close() throws SQLException {
44 }
45 }