Package com.mysql.cj.protocol.x

Class XProtocol

java.lang.Object

com.mysql.cj.protocol.AbstractProtocol<XMessage>

com.mysql.cj.protocol.x.XProtocol

All Implemented Interfaces:

Protocol<XMessage>

Direct Known Subclasses:

ClientImpl.PooledXProtocol

public class XProtocol
extends AbstractProtocol<XMessage>
implements Protocol<XMessage>

Low-level interface to communications with X Plugin.

Field Summary

Fields

Modifier and Type	Field	Description
static java.util.Map<java.lang.String,java.lang.Integer>	COLLATION_NAME_TO_COLLATION_INDEX
java.lang.String	defaultSchemaName

Fields inherited from class com.mysql.cj.protocol.AbstractProtocol

authProvider, exceptionInterceptor, log, messageBuilder, packetDebugRingBuffer, propertySet, queryTimingUnits, session, socketConnection, transactionManager, useNanosForElapsedTime

Constructor Summary

Constructors

Constructor	Description
XProtocol(HostInfo hostInfo, PropertySet propertySet)
XProtocol(java.lang.String host, int port, java.lang.String defaultSchema, PropertySet propertySet)

Method Summary

Modifier and Type	Method	Description
void	afterHandshake()
void	beforeHandshake()
void	changeDatabase(java.lang.String database)
void	changeUser(java.lang.String user, java.lang.String password, java.lang.String database)	Re-authenticates as the given user and password
XMessage	checkErrorMessage()	Read one message from the MySQL server, checks for errors in it, and if none, returns the message, ready for reading
void	close()
void	configureTimeZone()
void	connect(java.lang.String user, java.lang.String password, java.lang.String database)	Create a new session.
void	drainRows()	Used only in tests
boolean	failedPreparingStatement(int preparedStatementId, XProtocolError e)	Informs this protocol instance that preparing a statement on the connected server failed.
void	freePreparedStatementId(int preparedStatementId)	Frees a prepared statement id so that it can be reused.
ExceptionInterceptor	getExceptionInterceptor()
java.io.InputStream	getLocalInfileInputStream()	Returns the InputStream instance that will be used to send data in response to a "LOAD DATA LOCAL INFILE" statement.
int	getNewPreparedStatementId(PreparableStatement<?> preparableStatement)	Returns an id to be used as a client-managed prepared statement id.
java.lang.String	getPasswordCharacterEncoding()
java.lang.String	getQueryComment()	Returns the comment that will be prepended to all statements sent to the server.
ServerSession	getServerSession()
boolean	hasMoreResults()
boolean	hasResults()	Used only in tests
void	init(Session sess, SocketConnection socketConn, PropertySet propSet, TransactionEventHandler trManager)	Init method takes the place of constructor.
void	initServerSession()
boolean	isOpen()
boolean	isSqlResultPending()
void	negotiateCompression()	Negotiates compression capabilities with the server.
void	negotiateSSLConnection()
protected void	newCommand()	Signal the intent to start processing a new command.
<M extends Message, R extends QueryResult> R	query(M message, ResultBuilder<R> resultBuilder)
<M extends Message, R extends QueryResult> java.util.concurrent.CompletableFuture<R>	queryAsync(M message, ResultBuilder<R> resultBuilder)
<T extends ProtocolEntity> T	read(java.lang.Class<Resultset> requiredClass, int maxRows, boolean streamResults, XMessage resultPacket, boolean isBinaryEncoded, ColumnDefinition metadata, ProtocolEntityFactory<T,XMessage> protocolEntityFactory)	Read protocol entity.
<T extends ProtocolEntity> T	read(java.lang.Class<T> requiredClass, ProtocolEntityFactory<T,XMessage> protocolEntityFactory)
byte[]	readAuthenticateContinue()
void	readAuthenticateOk()
XMessage	readMessage(XMessage reuse)	Read one message from the MySQL server into the reusable buffer if provided or into the new one.
ColumnDefinition	readMetadata()
ColumnDefinition	readMetadata(Field f, java.util.function.Consumer<Notice> noticeConsumer)
<T extends QueryResult> T	readQueryResult(ResultBuilder<T> resultBuilder)	Read messages from server and deliver them to resultBuilder.
XProtocolRow	readRowOrNull(ColumnDefinition metadata, java.util.function.Consumer<Notice> noticeConsumer)
ServerCapabilities	readServerCapabilities()	Get the capabilities from the server.
boolean	readyForPreparingStatements()	Checks if enough statements have been executed in this MySQL server so that another prepare statement attempt should be done.
void	reset()	Return Protocol to its initial state right after successful connect.
void	send(Message message, int packetLen)
void	sendCapabilities(java.util.Map<java.lang.String,java.lang.Object> keyValuePair)	Set client capabilities of current session.
XMessage	sendCommand(Message queryPacket, boolean skipCheck, int timeoutMillis)	Send a command to the MySQL server.
void	setLocalInfileInputStream(java.io.InputStream stream)	Sets an InputStream instance that will be used to send data to the MySQL server for a "LOAD DATA LOCAL INFILE" statement rather than a FileInputStream or URLInputStream that represents the path given as an argument to the statement.
void	setMaxAllowedPacket(int maxAllowedPacket)
void	setQueryComment(java.lang.String comment)	Sets the comment that will be prepended to all statements sent to the server.
boolean	supportsPreparedStatements()	Checks if the MySQL server currently connected supports prepared statements.
boolean	versionMeetsMinimum(int major, int minor, int subminor)

Methods inherited from class com.mysql.cj.protocol.AbstractProtocol

getAuthenticationProvider, getMessageBuilder, getPacketReceivedTimeHolder, getPacketSentTimeHolder, getPropertySet, getQueryTimingUnits, getSocketConnection, setPacketReceivedTimeHolder, setPacketSentTimeHolder, setPropertySet

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.mysql.cj.protocol.Protocol

getAuthenticationProvider, getMessageBuilder, getPacketReceivedTimeHolder, getPacketSentTimeHolder, getPropertySet, getQueryTimingUnits, getSocketConnection, setPacketReceivedTimeHolder, setPacketSentTimeHolder, setPropertySet

Field Details

defaultSchemaName

public java.lang.String defaultSchemaName

COLLATION_NAME_TO_COLLATION_INDEX

public static java.util.Map<java.lang.String,java.lang.Integer> COLLATION_NAME_TO_COLLATION_INDEX

Constructor Details

XProtocol

public XProtocol(java.lang.String host, int port, java.lang.String defaultSchema, PropertySet propertySet)

XProtocol

public XProtocol(HostInfo hostInfo, PropertySet propertySet)

Method Details

init

public void init(Session sess, SocketConnection socketConn, PropertySet propSet, TransactionEventHandler trManager)

Description copied from interface: Protocol

Init method takes the place of constructor. A constructor should be used unless the encapsulation of ProtocolFactory is necessary.

Specified by:

init in interface Protocol<XMessage>

Overrides:

init in class AbstractProtocol<XMessage>

Parameters:

sess - Session

socketConn - SocketConnection

propSet - PropertySet

trManager - TransactionEventHandler

getServerSession

public ServerSession getServerSession()

Specified by:

getServerSession in interface Protocol<XMessage>

sendCapabilities

public void sendCapabilities(java.util.Map<java.lang.String,java.lang.Object> keyValuePair)

Set client capabilities of current session. Must be done before authentication (changeUser(String, String, String)).

Parameters:

keyValuePair - capabilities name/value map

negotiateSSLConnection

public void negotiateSSLConnection()

Specified by:

negotiateSSLConnection in interface Protocol<XMessage>

negotiateCompression

public void negotiateCompression()

Negotiates compression capabilities with the server.

beforeHandshake

public void beforeHandshake()

Specified by:

beforeHandshake in interface Protocol<XMessage>

connect

public void connect(java.lang.String user, java.lang.String password, java.lang.String database)

Description copied from interface: Protocol

Create a new session. This generally happens once at the beginning of a connection.

Specified by:

connect in interface Protocol<XMessage>

Parameters:

user - DB user name

password - DB user password

database - database name

changeUser

public void changeUser(java.lang.String user, java.lang.String password, java.lang.String database)

Description copied from interface: Protocol

Re-authenticates as the given user and password

Specified by:

changeUser in interface Protocol<XMessage>

Parameters:

user - DB user name

password - DB user password

database - database name

afterHandshake

public void afterHandshake()

Specified by:

afterHandshake in interface Protocol<XMessage>

configureTimeZone

public void configureTimeZone()

Specified by:

configureTimeZone in interface Protocol<XMessage>

initServerSession

public void initServerSession()

Specified by:

initServerSession in interface Protocol<XMessage>

readAuthenticateOk

public void readAuthenticateOk()

readAuthenticateContinue

public byte[] readAuthenticateContinue()

hasMoreResults

public boolean hasMoreResults()

readQueryResult

public <T extends QueryResult> T readQueryResult(ResultBuilder<T> resultBuilder)

Description copied from interface: Protocol

Read messages from server and deliver them to resultBuilder.

Specified by:

readQueryResult in interface Protocol<XMessage>

Type Parameters:

T - result type

Parameters:

resultBuilder - ResultBuilder instance

Returns:

QueryResult

hasResults

public boolean hasResults()

Used only in tests

Returns:

true if there are result rows

drainRows

public void drainRows()

Used only in tests

readMetadata

public ColumnDefinition readMetadata()

Specified by:

readMetadata in interface Protocol<XMessage>

readMetadata

public ColumnDefinition readMetadata(Field f, java.util.function.Consumer<Notice> noticeConsumer)

readRowOrNull

public XProtocolRow readRowOrNull(ColumnDefinition metadata, java.util.function.Consumer<Notice> noticeConsumer)

supportsPreparedStatements

public boolean supportsPreparedStatements()

Checks if the MySQL server currently connected supports prepared statements.

Returns:

true if the MySQL server currently connected supports prepared statements.

readyForPreparingStatements

public boolean readyForPreparingStatements()

Checks if enough statements have been executed in this MySQL server so that another prepare statement attempt should be done.

Returns:

true if enough executions have been done since last time a prepared statement failed to prepare

getNewPreparedStatementId

public int getNewPreparedStatementId(PreparableStatement<?> preparableStatement)

Returns an id to be used as a client-managed prepared statement id. The method freePreparedStatementId(int) must be called when the prepared statement is deallocated so that the same id can be re-used.

Parameters:

preparableStatement - PreparableStatement

Returns:

a new identifier to be used as prepared statement id

freePreparedStatementId

public void freePreparedStatementId(int preparedStatementId)

Frees a prepared statement id so that it can be reused. Note that freeing an id from an active prepared statement will result in a statement prepare conflict next time one gets prepared with the same released id.

Parameters:

preparedStatementId - the prepared statement id to release

failedPreparingStatement

public boolean failedPreparingStatement(int preparedStatementId, XProtocolError e)

Informs this protocol instance that preparing a statement on the connected server failed.

Parameters:

preparedStatementId - the id of the prepared statement that failed to prepare

e - XProtocolError

Returns:

true if the exception was properly handled

newCommand

protected void newCommand()

Signal the intent to start processing a new command. A session supports processing a single command at a time. Results are read lazily from the wire. It is necessary to flush any pending result before starting a new command. This method performs the flush if necessary.

query

public <M extends Message, R extends QueryResult> R query(M message, ResultBuilder<R> resultBuilder)

queryAsync

public <M extends Message, R extends QueryResult> java.util.concurrent.CompletableFuture<R> queryAsync(M message, ResultBuilder<R> resultBuilder)

isOpen

public boolean isOpen()

close

public void close() throws java.io.IOException

Specified by:

close in interface Protocol<XMessage>

Throws:

java.io.IOException

isSqlResultPending

public boolean isSqlResultPending()

setMaxAllowedPacket

public void setMaxAllowedPacket(int maxAllowedPacket)

send

public void send(Message message, int packetLen)

Specified by:

send in interface Protocol<XMessage>

Parameters:

message - Message instance

packetLen - length of header + payload

readServerCapabilities

public ServerCapabilities readServerCapabilities()

Get the capabilities from the server.

NOTE: This must be called before authentication.

Specified by:

readServerCapabilities in interface Protocol<XMessage>

Returns:

capabilities mapped by name

reset

public void reset()

Description copied from interface: Protocol

Return Protocol to its initial state right after successful connect.

Specified by:

reset in interface Protocol<XMessage>

Overrides:

reset in class AbstractProtocol<XMessage>

getExceptionInterceptor

public ExceptionInterceptor getExceptionInterceptor()

Specified by:

getExceptionInterceptor in interface Protocol<XMessage>

Overrides:

getExceptionInterceptor in class AbstractProtocol<XMessage>

changeDatabase

public void changeDatabase(java.lang.String database)

Specified by:

changeDatabase in interface Protocol<XMessage>

getPasswordCharacterEncoding

public java.lang.String getPasswordCharacterEncoding()

Specified by:

getPasswordCharacterEncoding in interface Protocol<XMessage>

versionMeetsMinimum

public boolean versionMeetsMinimum(int major, int minor, int subminor)

Specified by:

versionMeetsMinimum in interface Protocol<XMessage>

readMessage

public XMessage readMessage(XMessage reuse)

Description copied from interface: Protocol

Read one message from the MySQL server into the reusable buffer if provided or into the new one.

Specified by:

readMessage in interface Protocol<XMessage>

Parameters:

reuse - Message instance to read into, may be null

Returns:

the message from the server.

checkErrorMessage

public XMessage checkErrorMessage()

Description copied from interface: Protocol

Read one message from the MySQL server, checks for errors in it, and if none, returns the message, ready for reading

Specified by:

checkErrorMessage in interface Protocol<XMessage>

Returns:

a message ready for reading.

sendCommand

public XMessage sendCommand(Message queryPacket, boolean skipCheck, int timeoutMillis)

Description copied from interface: Protocol

Send a command to the MySQL server.

Specified by:

sendCommand in interface Protocol<XMessage>

Parameters:

queryPacket - a packet pre-loaded with data for the protocol (eg. from a client-side prepared statement). The first byte of this packet is the MySQL protocol 'command' from MysqlDefs

skipCheck - do not call checkErrorPacket() if true

timeoutMillis - timeout

Returns:

the response packet from the server

read

public <T extends ProtocolEntity> T read(java.lang.Class<T> requiredClass, ProtocolEntityFactory<T,XMessage> protocolEntityFactory) throws java.io.IOException

Specified by:

read in interface Protocol<XMessage>

Throws:

java.io.IOException

read

public <T extends ProtocolEntity> T read(java.lang.Class<Resultset> requiredClass, int maxRows, boolean streamResults, XMessage resultPacket, boolean isBinaryEncoded, ColumnDefinition metadata, ProtocolEntityFactory<T,XMessage> protocolEntityFactory) throws java.io.IOException

Description copied from interface: Protocol

Read protocol entity.

Specified by:

read in interface Protocol<XMessage>

Type Parameters:

T - object extending the ProtocolEntity

Parameters:

requiredClass - required Resultset class

maxRows - the maximum number of rows to read (-1 means all rows)

streamResults - should the driver leave the results on the wire, and read them only when needed?

resultPacket - the first packet of information in the result set

isBinaryEncoded - true if the binary protocol is used (for server prepared statements)

metadata - use this metadata instead of the one provided on wire

protocolEntityFactory - ProtocolEntityFactory instance

Returns:

ProtocolEntity instance

Throws:

java.io.IOException - if an error occurs

setLocalInfileInputStream

public void setLocalInfileInputStream(java.io.InputStream stream)

Description copied from interface: Protocol

Sets an InputStream instance that will be used to send data to the MySQL server for a "LOAD DATA LOCAL INFILE" statement rather than a FileInputStream or URLInputStream that represents the path given as an argument to the statement. This stream will be read to completion upon execution of a "LOAD DATA LOCAL INFILE" statement, and will automatically be closed by the driver, so it needs to be reset before each call to execute*() that would cause the MySQL server to request data to fulfill the request for "LOAD DATA LOCAL INFILE". If this value is set to NULL, the driver will revert to using a FileInputStream or URLInputStream as required.

Specified by:

setLocalInfileInputStream in interface Protocol<XMessage>

Parameters:

stream - input stream

getLocalInfileInputStream

public java.io.InputStream getLocalInfileInputStream()

Description copied from interface: Protocol

Returns the InputStream instance that will be used to send data in response to a "LOAD DATA LOCAL INFILE" statement. This method returns NULL if no such stream has been set via setLocalInfileInputStream().

Specified by:

getLocalInfileInputStream in interface Protocol<XMessage>

Returns:

input stream

getQueryComment

public java.lang.String getQueryComment()

Description copied from interface: Protocol

Returns the comment that will be prepended to all statements sent to the server.

Specified by:

getQueryComment in interface Protocol<XMessage>

Returns:

query comment string

setQueryComment

public void setQueryComment(java.lang.String comment)

Description copied from interface: Protocol

Sets the comment that will be prepended to all statements sent to the server. Do not use slash-star or star-slash tokens in the comment as these will be added by the driver itself.

Specified by:

setQueryComment in interface Protocol<XMessage>

Parameters:

comment - query comment string