Module lettuce.core

Package io.lettuce.core.cluster

Class StatefulRedisClusterConnectionImpl<K,V>

java.lang.Object

io.lettuce.core.RedisChannelHandler<K,V>

io.lettuce.core.cluster.StatefulRedisClusterConnectionImpl<K,V>

All Implemented Interfaces:

StatefulConnection<K,V>, StatefulRedisClusterConnection<K,V>, AsyncCloseable, ConnectionFacade, Closeable, AutoCloseable

public class StatefulRedisClusterConnectionImpl<K,V>
extends RedisChannelHandler<K,V>
implements StatefulRedisClusterConnection<K,V>

A thread-safe connection to a Redis Cluster. Multiple threads may share one StatefulRedisClusterConnectionImpl A ConnectionWatchdog monitors each connection and reconnects automatically until RedisChannelHandler.close() is called. All pending commands will be (re)sent after successful reconnection.

Since:

4.0

Author:

Mark Paluch

Field Summary

Fields

Modifier and Type	Field	Description
protected RedisAdvancedClusterAsyncCommandsImpl<K,V>	async
protected RedisCodec<K,V>	codec
protected RedisAdvancedClusterReactiveCommandsImpl<K,V>	reactive
protected RedisAdvancedClusterCommands<K,V>	sync

Constructor Summary

Constructors

Constructor	Description
StatefulRedisClusterConnectionImpl(RedisChannelWriter writer, ClusterPushHandler pushHandler, RedisCodec<K,V> codec, Duration timeout)	Initialize a new connection.

Method Summary

Modifier and Type	Method	Description
void	activated()	Notification when the connection becomes active (connected).
void	addListener(RedisClusterPushListener listener)	Add a new listener to consume push messages.
RedisAdvancedClusterAsyncCommands<K,V>	async()	Returns the RedisAdvancedClusterAsyncCommands API for the current connection.
<T> RedisCommand<K,V,T>	dispatch(RedisCommand<K,V,T> command)	Dispatch a command.
Collection<RedisCommand<K,V,?>>	dispatch(Collection<? extends RedisCommand<K,V,?>> commands)	Dispatch multiple command in a single write on the channel.
StatefulRedisConnection<K,V>	getConnection(String nodeId)	Retrieve a connection to the specified cluster node using the nodeId.
StatefulRedisConnection<K,V>	getConnection(String host, int port)	Retrieve a connection to the specified cluster node using host and port.
CompletableFuture<StatefulRedisConnection<K,V>>	getConnectionAsync(String nodeId)	Retrieve asynchronously a connection to the specified cluster node using the nodeId.
CompletableFuture<StatefulRedisConnection<K,V>>	getConnectionAsync(String host, int port)	Retrieve asynchronously a connection to the specified cluster node using host and port.
Partitions	getPartitions()
ReadFrom	getReadFrom()	Gets the ReadFrom setting for this connection.
RedisAdvancedClusterReactiveCommands<K,V>	reactive()	Returns the RedisAdvancedClusterReactiveCommands API for the current connection.
void	removeListener(RedisClusterPushListener listener)	Remove an existing listener.
void	setPartitions(Partitions partitions)
void	setReadFrom(ReadFrom readFrom)	Set from which nodes data is read.
RedisAdvancedClusterCommands<K,V>	sync()	Returns the RedisAdvancedClusterCommands API for the current connection.
protected InvocationHandler	syncInvocationHandler()

Methods inherited from class io.lettuce.core.RedisChannelHandler

addListener, close, closeAsync, deactivated, flushCommands, getChannelWriter, getOptions, getResources, getTimeout, isClosed, isOpen, registerCloseables, reset, setAutoFlushCommands, setOptions, setTimeout, syncHandler

Methods inherited from class java.lang.Object

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

Methods inherited from interface io.lettuce.core.api.StatefulConnection

close, closeAsync, flushCommands, getOptions, getResources, getTimeout, isOpen, reset, setAutoFlushCommands, setTimeout

Methods inherited from interface io.lettuce.core.cluster.api.StatefulRedisClusterConnection

getChannelWriter

Field Details

codec

protected final RedisCodec<K,V> codec

sync

protected final RedisAdvancedClusterCommands<K,V> sync

async

protected final RedisAdvancedClusterAsyncCommandsImpl<K,V> async

reactive

protected final RedisAdvancedClusterReactiveCommandsImpl<K,V> reactive

Constructor Details

StatefulRedisClusterConnectionImpl

public StatefulRedisClusterConnectionImpl(RedisChannelWriter writer,
ClusterPushHandler pushHandler,
RedisCodec<K,V> codec,
Duration timeout)

Initialize a new connection.

Parameters:

writer - the channel writer

pushHandler - the Cluster push handler

codec - Codec used to encode/decode keys and values.

timeout - Maximum time to wait for a response.

Method Details

sync

public RedisAdvancedClusterCommands<K,V> sync()

Description copied from interface: StatefulRedisClusterConnection

Returns the RedisAdvancedClusterCommands API for the current connection. Does not create a new connection.

Specified by:

sync in interface StatefulRedisClusterConnection<K,V>

Returns:

the synchronous API for the underlying connection.

syncInvocationHandler

protected InvocationHandler syncInvocationHandler()

async

public RedisAdvancedClusterAsyncCommands<K,V> async()

Description copied from interface: StatefulRedisClusterConnection

Returns the RedisAdvancedClusterAsyncCommands API for the current connection. Does not create a new connection.

Specified by:

async in interface StatefulRedisClusterConnection<K,V>

Returns:

the asynchronous API for the underlying connection.

reactive

public RedisAdvancedClusterReactiveCommands<K,V> reactive()

Description copied from interface: StatefulRedisClusterConnection

Returns the RedisAdvancedClusterReactiveCommands API for the current connection. Does not create a new connection.

Specified by:

reactive in interface StatefulRedisClusterConnection<K,V>

Returns:

the reactive API for the underlying connection.

addListener

public void addListener(RedisClusterPushListener listener)

Description copied from interface: StatefulRedisClusterConnection

Add a new listener to consume push messages.

Specified by:

addListener in interface StatefulRedisClusterConnection<K,V>

Parameters:

listener - the listener, must not be null.

removeListener

public void removeListener(RedisClusterPushListener listener)

Description copied from interface: StatefulRedisClusterConnection

Remove an existing listener.

Specified by:

removeListener in interface StatefulRedisClusterConnection<K,V>

Parameters:

listener - the listener, must not be null.

getConnection

public StatefulRedisConnection<K,V> getConnection(String nodeId)

Description copied from interface: StatefulRedisClusterConnection

Retrieve a connection to the specified cluster node using the nodeId. Host and port are looked up in the node list. This connection is bound to the node id. Once the cluster topology view is updated, the connection will try to reconnect the to the node with the specified nodeId, that behavior can also lead to a closed connection once the node with the specified nodeId is no longer part of the cluster. Do not close the connections. Otherwise, unpredictable behavior will occur. The nodeId must be part of the cluster and is validated against the current topology view in Partitions. In contrast to the StatefulRedisClusterConnection, node-connections do not route commands to other cluster nodes.

Specified by:

getConnection in interface StatefulRedisClusterConnection<K,V>

Parameters:

nodeId - the node Id

Returns:

a connection to the requested cluster node

getConnectionAsync

public CompletableFuture<StatefulRedisConnection<K,V>> getConnectionAsync(String nodeId)

Description copied from interface: StatefulRedisClusterConnection

Retrieve asynchronously a connection to the specified cluster node using the nodeId. Host and port are looked up in the node list. This connection is bound to the node id. Once the cluster topology view is updated, the connection will try to reconnect the to the node with the specified nodeId, that behavior can also lead to a closed connection once the node with the specified nodeId is no longer part of the cluster. Do not close the connections. Otherwise, unpredictable behavior will occur. The nodeId must be part of the cluster and is validated against the current topology view in Partitions. In contrast to the StatefulRedisClusterConnection, node-connections do not route commands to other cluster nodes.

Specified by:

getConnectionAsync in interface StatefulRedisClusterConnection<K,V>

Parameters:

nodeId - the node Id

Returns:

CompletableFuture to indicate success or failure to connect to the requested cluster node.

getConnection

public StatefulRedisConnection<K,V> getConnection(String host,
int port)

Description copied from interface: StatefulRedisClusterConnection

Retrieve a connection to the specified cluster node using host and port. This connection is bound to a host and port. Updates to the cluster topology view can close the connection once the host, identified by host and port, are no longer part of the cluster.

Do not close the connections. Otherwise, unpredictable behavior will occur. Host and port connections are verified by default for cluster membership, see ClusterClientOptions.isValidateClusterNodeMembership().

In contrast to the StatefulRedisClusterConnection, node-connections do not route commands to other cluster nodes.

Specified by:

getConnection in interface StatefulRedisClusterConnection<K,V>

Parameters:

host - the host

port - the port

Returns:

a connection to the requested cluster node

getConnectionAsync

public CompletableFuture<StatefulRedisConnection<K,V>> getConnectionAsync(String host,
int port)

Description copied from interface: StatefulRedisClusterConnection

Retrieve asynchronously a connection to the specified cluster node using host and port. This connection is bound to a host and port. Updates to the cluster topology view can close the connection once the host, identified by host and port, are no longer part of the cluster.

Do not close the connections. Otherwise, unpredictable behavior will occur. Host and port connections are verified by default for cluster membership, see ClusterClientOptions.isValidateClusterNodeMembership().

In contrast to the StatefulRedisClusterConnection, node-connections do not route commands to other cluster nodes.

Specified by:

getConnectionAsync in interface StatefulRedisClusterConnection<K,V>

Parameters:

host - the host

port - the port

Returns:

CompletableFuture to indicate success or failure to connect to the requested cluster node.

activated

public void activated()

Description copied from class: RedisChannelHandler

Notification when the connection becomes active (connected).

Specified by:

activated in interface ConnectionFacade

Overrides:

activated in class RedisChannelHandler<K,V>

dispatch

public <T> RedisCommand<K,V,T> dispatch(RedisCommand<K,V,T> command)

Description copied from interface: StatefulConnection

Dispatch a command. Write a command on the channel. The command may be changed/wrapped during write and the written instance is returned after the call. This command does not wait until the command completes and does not guarantee whether the command is executed successfully.

Specified by:

dispatch in interface StatefulConnection<K,V>

Overrides:

dispatch in class RedisChannelHandler<K,V>

Type Parameters:

T - result type

Parameters:

command - the Redis command.

Returns:

the written Redis command.

dispatch

public Collection<RedisCommand<K,V,?>> dispatch(Collection<? extends RedisCommand<K,V,?>> commands)

Description copied from interface: StatefulConnection

Dispatch multiple command in a single write on the channel. The commands may be changed/wrapped during write and the written instance is returned after the call. This command does not wait until the command completes and does not guarantee whether the command is executed successfully.

Specified by:

dispatch in interface StatefulConnection<K,V>

Overrides:

dispatch in class RedisChannelHandler<K,V>

Parameters:

commands - the Redis commands.

Returns:

the written Redis commands.

setPartitions

public void setPartitions(Partitions partitions)

getPartitions

public Partitions getPartitions()

Specified by:

getPartitions in interface StatefulRedisClusterConnection<K,V>

Returns:

Known partitions for this connection.

setReadFrom

public void setReadFrom(ReadFrom readFrom)

Description copied from interface: StatefulRedisClusterConnection

Set from which nodes data is read. The setting is used as default for read operations on this connection. See the documentation for ReadFrom for more information.

Specified by:

setReadFrom in interface StatefulRedisClusterConnection<K,V>

Parameters:

readFrom - the read from setting, must not be null

getReadFrom

public ReadFrom getReadFrom()

Description copied from interface: StatefulRedisClusterConnection

Gets the ReadFrom setting for this connection. Defaults to ReadFrom.UPSTREAM if not set.

Specified by:

getReadFrom in interface StatefulRedisClusterConnection<K,V>

Returns:

the read from setting