Package io.lettuce.core.protocol

Class RedisStateMachine

java.lang.Object

io.lettuce.core.protocol.RedisStateMachine

public class RedisStateMachine
extends Object

State machine that decodes redis server responses encoded according to the Unified Request Protocol (RESP). Supports RESP2 and RESP3. Initialized with protocol discovery.

Author:

Will Glozer, Mark Paluch, Helly Guo, shikharid

Constructor Summary

Constructors

Constructor	Description
RedisStateMachine()	Initialize a new instance.
RedisStateMachine(ByteBufAllocator alloc)	Deprecated. since 6.3, no longer required.

Method Summary

Modifier and Type	Method	Description
void	close()	Close the state machine to free resources.
boolean	decode(ByteBuf buffer, CommandOutput<?,?,?> output)	Decode a command using the input buffer.
boolean	decode(ByteBuf buffer, CommandOutput<?,?,?> output, Consumer<Exception> errorHandler)	Attempt to decode a redis response and return a flag indicating whether a complete response was read.
ProtocolVersion	getProtocolVersion()
boolean	isDiscoverProtocol()
void	reset()	Reset the state machine.
protected void	safeMultiArray(CommandOutput<?,?,?> output, int count, Consumer<Exception> errorHandler)	Safely sets CommandOutput.multiArray(int).
protected void	safeMultiMap(CommandOutput<?,?,?> output, int count, Consumer<Exception> errorHandler)	Safely sets CommandOutput.multiMap(int).
protected void	safeMultiPush(CommandOutput<?,?,?> output, int count, Consumer<Exception> errorHandler)	Safely sets CommandOutput.multiPush(int).
protected void	safeMultiSet(CommandOutput<?,?,?> output, int count, Consumer<Exception> errorHandler)	Safely sets CommandOutput.multiSet(int).
protected void	safeSet(CommandOutput<?,?,?> output, boolean value, Consumer<Exception> errorHandler)	Safely sets CommandOutput.set(boolean).
protected void	safeSet(CommandOutput<?,?,?> output, double number, Consumer<Exception> errorHandler)	Safely sets CommandOutput.set(double).
protected void	safeSet(CommandOutput<?,?,?> output, long number, Consumer<Exception> errorHandler)	Safely sets CommandOutput.set(long).
protected void	safeSet(CommandOutput<?,?,?> output, ByteBuffer bytes, Consumer<Exception> errorHandler)	Safely sets CommandOutput.set(ByteBuffer).
protected void	safeSetBigNumber(CommandOutput<?,?,?> output, ByteBuffer bytes, Consumer<Exception> errorHandler)	Safely sets CommandOutput.set(ByteBuffer).
protected void	safeSetError(CommandOutput<?,?,?> output, ByteBuffer bytes, Consumer<Exception> errorHandler)	Safely sets CommandOutput.setError(ByteBuffer).
protected void	safeSetSingle(CommandOutput<?,?,?> output, ByteBuffer bytes, Consumer<Exception> errorHandler)	Safely sets CommandOutput.set(ByteBuffer).
void	setProtocolVersion(ProtocolVersion protocolVersion)

Methods inherited from class java.lang.Object

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

Constructor Detail

RedisStateMachine

@Deprecated
public RedisStateMachine(ByteBufAllocator alloc)

Deprecated.

since 6.3, no longer required.

Initialize a new instance.

RedisStateMachine

public RedisStateMachine()

Initialize a new instance.

Method Detail

isDiscoverProtocol

public boolean isDiscoverProtocol()

getProtocolVersion

public ProtocolVersion getProtocolVersion()

setProtocolVersion

public void setProtocolVersion(ProtocolVersion protocolVersion)

decode

public boolean decode(ByteBuf buffer,
                      CommandOutput<?,?,?> output)

Decode a command using the input buffer.

Parameters:

buffer - Buffer containing data from the server.

output - Current command output.

Returns:

true if a complete response was read.

decode

public boolean decode(ByteBuf buffer,
                      CommandOutput<?,?,?> output,
                      Consumer<Exception> errorHandler)

Attempt to decode a redis response and return a flag indicating whether a complete response was read.

Parameters:

buffer - Buffer containing data from the server.

output - Current command output.

errorHandler - the error handler

Returns:

true if a complete response was read.

reset

public void reset()

Reset the state machine.

close

public void close()

Close the state machine to free resources.

safeSet

protected void safeSet(CommandOutput<?,?,?> output,
                       boolean value,
                       Consumer<Exception> errorHandler)

Safely sets CommandOutput.set(boolean). Completes a errorHandler exceptionally in case an exception occurs.

Parameters:

output -

value -

errorHandler -

safeSet

protected void safeSet(CommandOutput<?,?,?> output,
                       long number,
                       Consumer<Exception> errorHandler)

Safely sets CommandOutput.set(long). Notifies the errorHandler if an exception occurs.

Parameters:

output -

number -

errorHandler -

safeSet

protected void safeSet(CommandOutput<?,?,?> output,
                       double number,
                       Consumer<Exception> errorHandler)

Safely sets CommandOutput.set(double). Notifies the errorHandler if an exception occurs.

Parameters:

output -

number -

errorHandler -

safeSet

protected void safeSet(CommandOutput<?,?,?> output,
                       ByteBuffer bytes,
                       Consumer<Exception> errorHandler)

Safely sets CommandOutput.set(ByteBuffer). Notifies the errorHandler if an exception occurs.

Parameters:

output -

bytes -

errorHandler -

safeSetSingle

protected void safeSetSingle(CommandOutput<?,?,?> output,
                             ByteBuffer bytes,
                             Consumer<Exception> errorHandler)

Safely sets CommandOutput.set(ByteBuffer). Notifies the errorHandler if an exception occurs.

Parameters:

output -

bytes -

errorHandler -

safeSetBigNumber

protected void safeSetBigNumber(CommandOutput<?,?,?> output,
                                ByteBuffer bytes,
                                Consumer<Exception> errorHandler)

Safely sets CommandOutput.set(ByteBuffer). Notifies the errorHandler if an exception occurs.

Parameters:

output -

bytes -

errorHandler -

safeMultiArray

protected void safeMultiArray(CommandOutput<?,?,?> output,
                              int count,
                              Consumer<Exception> errorHandler)

Safely sets CommandOutput.multiArray(int). Notifies the errorHandler if an exception occurs.

Parameters:

output -

count -

errorHandler -

safeMultiPush

protected void safeMultiPush(CommandOutput<?,?,?> output,
                             int count,
                             Consumer<Exception> errorHandler)

Safely sets CommandOutput.multiPush(int). Notifies the errorHandler if an exception occurs.

Parameters:

output -

count -

errorHandler -

safeMultiSet

protected void safeMultiSet(CommandOutput<?,?,?> output,
                            int count,
                            Consumer<Exception> errorHandler)

Safely sets CommandOutput.multiSet(int). Notifies the errorHandler if an exception occurs.

Parameters:

output -

count -

errorHandler -

safeMultiMap

protected void safeMultiMap(CommandOutput<?,?,?> output,
                            int count,
                            Consumer<Exception> errorHandler)

Safely sets CommandOutput.multiMap(int). Notifies the errorHandler if an exception occurs.

Parameters:

output -

count -

errorHandler -

safeSetError

protected void safeSetError(CommandOutput<?,?,?> output,
                            ByteBuffer bytes,
                            Consumer<Exception> errorHandler)

Safely sets CommandOutput.setError(ByteBuffer). Notifies the errorHandler if an exception occurs.

Parameters:

output -

bytes -

errorHandler -