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.db.protocol.mysql.packet.binlog;
19
20 import lombok.AccessLevel;
21 import lombok.Getter;
22 import lombok.RequiredArgsConstructor;
23 import org.apache.shardingsphere.db.protocol.mysql.packet.MySQLPacket;
24 import org.apache.shardingsphere.db.protocol.mysql.payload.MySQLPacketPayload;
25
26 /**
27 * Abstract MySQL binlog event packet.
28 */
29 @RequiredArgsConstructor(access = AccessLevel.PROTECTED)
30 @Getter
31 public abstract class AbstractMySQLBinlogEventPacket extends MySQLPacket implements MySQLBinlogEventPacket {
32
33 private final MySQLBinlogEventHeader binlogEventHeader;
34
35 @Override
36 protected final void write(final MySQLPacketPayload payload) {
37 binlogEventHeader.write(payload);
38 writeEvent(payload);
39 }
40
41 /**
42 * Write event body packet to byte buffer.
43 *
44 * @param payload packet payload to be written
45 */
46 protected abstract void writeEvent(MySQLPacketPayload payload);
47
48 protected int getRemainBytesLength(final MySQLPacketPayload payload) {
49 // minus checksum bytes, add statusCode 1 byte(not include at event size)
50 int alreadyReadIndex = binlogEventHeader.getEventSize() + 1 - binlogEventHeader.getChecksumLength();
51 if (payload.getByteBuf().readerIndex() > alreadyReadIndex) {
52 return -1;
53 }
54 return alreadyReadIndex - payload.getByteBuf().readerIndex();
55 }
56 }