Package io.debezium.kafka

Class KafkaServer

java.lang.Object

io.debezium.kafka.KafkaServer

@ThreadSafe
public class KafkaServer
extends Object

A small embedded Kafka server.

Author:

Randall Hauch

Field Summary

Fields

Modifier and Type	Field	Description
private kafka.zk.AdminZkClient	adminZkClient
private int	brokerId
private Properties	config
static int	DEFAULT_BROKER_ID
private int	desiredPort
private static org.slf4j.Logger	LOGGER
private File	logsDir
private int	port
private kafka.server.KafkaServer	server
private Supplier<String>	zkConnection

Constructor Summary

Constructors

Constructor	Description
KafkaServer(Supplier<String> zookeeperConnection)	Create a new server instance.
KafkaServer(Supplier<String> zookeeperConnection, int brokerId)	Create a new server instance.
KafkaServer(Supplier<String> zookeeperConnection, int brokerId, int port)	Create a new server instance.

Method Summary

Modifier and Type	Method	Description
protected int	brokerId()
Properties	config()	Get a copy of the complete configuration that is or will be used by the running server.
void	createTopic(String topic, int numPartitions, int replicationFactor)	Create the specified topic.
void	createTopics(int numPartitions, int replicationFactor, String... topics)	Create the specified topics.
void	createTopics(String... topics)	Create the specified topics.
void	deleteData()	Delete all of the data associated with this server.
kafka.zk.AdminZkClient	getAdminZkClient()	Get the Zookeeper admin client used by the running Kafka server.
String	getConnection()	Get the connection string.
File	getStateDirectory()	Get the parent directory where the broker's state will be kept.
(package private) void	onEachDirectory(Consumer<File> consumer)	Perform the supplied function on each directory used by this server.
protected void	populateDefaultConfiguration(Properties props)	Set the initial default configuration properties.
KafkaServer	setPort(int port)	Set the port for the server.
KafkaServer	setProperties(Properties properties)	Set multiple configuration properties.
KafkaServer	setProperty(String name, String value)	Set a configuration property.
void	setStateDirectory(File stateDirectory)	Set the parent directory where the broker's state will be kept.
void	shutdown(boolean deleteLogs)	Shutdown the embedded Kafka server and delete all data.
KafkaServer	startup()	Start the embedded Kafka server.
String	toString()
protected String	zookeeperConnection()

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_BROKER_ID

public static final int DEFAULT_BROKER_ID

See Also:

Constant Field Values

LOGGER

private static final org.slf4j.Logger LOGGER

zkConnection

private final Supplier<String> zkConnection

brokerId

private final int brokerId

logsDir

private volatile File logsDir

config

private final Properties config

desiredPort

private volatile int desiredPort

port

private volatile int port

server

private volatile kafka.server.KafkaServer server

adminZkClient

private volatile kafka.zk.AdminZkClient adminZkClient

Constructor Detail

KafkaServer

public KafkaServer(Supplier<String> zookeeperConnection)

Create a new server instance.

Parameters:

zookeeperConnection - the supplier of the Zookeeper connection string; may not be null

KafkaServer

public KafkaServer(Supplier<String> zookeeperConnection,
                   int brokerId)

Create a new server instance.

Parameters:

zookeeperConnection - the supplier of the Zookeeper connection string; may not be null

brokerId - the unique broker ID

KafkaServer

public KafkaServer(Supplier<String> zookeeperConnection,
                   int brokerId,
                   int port)

Create a new server instance.

Parameters:

zookeeperConnection - the supplier of the Zookeeper connection string; may not be null

brokerId - the unique broker ID

port - the desired port

Method Detail

brokerId

protected int brokerId()

zookeeperConnection

protected String zookeeperConnection()

populateDefaultConfiguration

protected void populateDefaultConfiguration(Properties props)

Set the initial default configuration properties. This method is called from the constructors and can be overridden to customize these properties.

Parameters:

props - the configuration properties; never null

setProperty

public KafkaServer setProperty(String name,
                               String value)

Set a configuration property. Several key properties that deal with Zookeeper, the host name, and the broker ID, may not be set via this method and are ignored since they are controlled elsewhere in this instance.

Parameters:

name - the property name; may not be null

value - the property value; may be null

Returns:

this instance to allow chaining methods; never null

Throws:

IllegalStateException - if the server is running when this method is called

setProperties

public KafkaServer setProperties(Properties properties)

Set multiple configuration properties. Several key properties that deal with Zookeeper, the host name, and the broker ID, may not be set via this method and are ignored since they are controlled elsewhere in this instance.

Parameters:

properties - the configuration properties; may be null or empty

Returns:

this instance to allow chaining methods; never null

Throws:

IllegalStateException - if the server is running when this method is called

setPort

public KafkaServer setPort(int port)

Set the port for the server.

Parameters:

port - the desired port, or -1 if a random available port should be found and used

Returns:

this instance to allow chaining methods; never null

config

public Properties config()

Get a copy of the complete configuration that is or will be used by the running server.

Returns:

the properties for the currently-running server; may be empty if not running

getConnection

public String getConnection()

Get the connection string. If the server is not running and the port is to be dynamically discovered upon startup, then this method returns "localhost:-1".

Returns:

the connection string; never null

startup

public KafkaServer startup()

Start the embedded Kafka server.

Returns:

this instance to allow chaining methods; never null

Throws:

IllegalStateException - if the server is already running

shutdown

public void shutdown(boolean deleteLogs)

Shutdown the embedded Kafka server and delete all data.

Parameters:

deleteLogs - whether or not to remove all the log files after shutting down

deleteData

public void deleteData()

Delete all of the data associated with this server.

getAdminZkClient

public kafka.zk.AdminZkClient getAdminZkClient()

Get the Zookeeper admin client used by the running Kafka server.

Returns:

the Zookeeper admin client, or null if the Kafka server is not running

createTopics

public void createTopics(String... topics)

Create the specified topics.

Parameters:

topics - the names of the topics to create

createTopics

public void createTopics(int numPartitions,
                         int replicationFactor,
                         String... topics)

Create the specified topics.

Parameters:

numPartitions - the number of partitions for each topic

replicationFactor - the replication factor for each topic

topics - the names of the topics to create

createTopic

public void createTopic(String topic,
                        int numPartitions,
                        int replicationFactor)

Create the specified topic.

Parameters:

topic - the name of the topic to create

numPartitions - the number of partitions for the topic

replicationFactor - the replication factor for the topic

onEachDirectory

void onEachDirectory(Consumer<File> consumer)

Perform the supplied function on each directory used by this server.

Parameters:

consumer - the consumer function; may not be null

getStateDirectory

public File getStateDirectory()

Get the parent directory where the broker's state will be kept. The broker will create a subdirectory for itself under this directory.

Returns:

the parent directory for the broker's state; may be null if a temporary directory will be used

setStateDirectory

public void setStateDirectory(File stateDirectory)

Set the parent directory where the broker's state will be kept. The broker will create a subdirectory for itself under this directory.

Parameters:

stateDirectory - the parent directory for the broker's state; may be null if a temporary directory will be used

Throws:

IllegalArgumentException - if the supplied file is not a directory or not writable

toString

public String toString()

Overrides:

toString in class Object