程序包 com.mysql.cj.protocol.a

类 CompressedPacketSender

java.lang.Object

com.mysql.cj.protocol.a.CompressedPacketSender

所有已实现的接口:

MessageSender<NativePacketPayload>

public class CompressedPacketSender
extends Object
implements MessageSender<NativePacketPayload>

A MessageSender for the compressed protocol. TODO: add support for pre-allocated buffer for large packets (if there's a demonstrable perf improvement)

字段概要

字段

修饰符和类型	字段	说明
static int	COMP_HEADER_LENGTH
static int	MIN_COMPRESS_LEN

构造器概要

构造器

构造器	说明
CompressedPacketSender(BufferedOutputStream outputStream)

方法概要

修饰符和类型	方法	说明
void	send(byte[] packet, int packetLen, byte packetSequence)	Packet sender implementation for the compressed MySQL protocol.
void	stop()	Shut down this packet sender and deallocate any resources.
MessageSender<NativePacketPayload>	undecorate()	Return the previous PacketSender instance from the decorators chain or the current PacketSender if it is the first entry in a chain.
MessageSender<NativePacketPayload>	undecorateAll()	Return a PacketSender instance free of decorators.

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

从接口继承的方法 com.mysql.cj.protocol.MessageSender

send, send, setMaxAllowedPacket

字段详细资料

COMP_HEADER_LENGTH

public static final int COMP_HEADER_LENGTH

另请参阅:

常量字段值

MIN_COMPRESS_LEN

public static final int MIN_COMPRESS_LEN

另请参阅:

常量字段值

构造器详细资料

CompressedPacketSender

public CompressedPacketSender(BufferedOutputStream outputStream)

方法详细资料

stop

public void stop()

Shut down this packet sender and deallocate any resources.

send

public void send(byte[] packet,
                 int packetLen,
                 byte packetSequence)
          throws IOException

Packet sender implementation for the compressed MySQL protocol. For compressed transmission of multi-packets, split the packets up in the same way as the uncompressed protocol. We fit up to MAX_PACKET_SIZE bytes of split uncompressed packet, including the header, into an compressed packet. The first packet of the multi-packet is 4 bytes of header and MAX_PACKET_SIZE - 4 bytes of the payload. The next packet must send the remaining four bytes of the payload followed by a new header and payload. If the second split packet is also around MAX_PACKET_SIZE in length, then only MAX_PACKET_SIZE - 4 (from the previous packet) - 4 (for the new header) can be sent. This means the payload will be limited by 8 bytes and this will continue to increase by 4 at every iteration.

指定者:

send 在接口中 MessageSender<NativePacketPayload>

参数:

packet - data bytes

packetLen - packet length

packetSequence - sequence id

抛出:

IOException - if i/o exception occurs

undecorateAll

public MessageSender<NativePacketPayload> undecorateAll()

从接口复制的说明: MessageSender

Return a PacketSender instance free of decorators.

指定者:

undecorateAll 在接口中 MessageSender<NativePacketPayload>

返回:

MessageSender instance

undecorate

public MessageSender<NativePacketPayload> undecorate()

从接口复制的说明: MessageSender

Return the previous PacketSender instance from the decorators chain or the current PacketSender if it is the first entry in a chain.

指定者:

undecorate 在接口中 MessageSender<NativePacketPayload>

返回:

MessageSender instance