org.apache.nifi.cluster.protocol.impl

Class ClusterServiceDiscovery

java.lang.Object

org.apache.nifi.cluster.protocol.impl.ClusterServiceDiscovery

All Implemented Interfaces:

ProtocolListener, MulticastServiceDiscovery, ServiceDiscovery

public class ClusterServiceDiscovery
extends Object
implements MulticastServiceDiscovery, ProtocolListener

An implementation for discovering services by way of "service broadcast" type protocol messages over multicast. The client caller is responsible for starting and stopping the service discovery. The instance must be stopped before termination of the JVM to ensure proper resource clean-up.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
private class	ClusterServiceDiscovery.ClusterManagerServiceBroadcastHandler

Field Summary

Fields

Modifier and Type	Field and Description
private BulletinRepository	bulletinRepository
private MulticastProtocolListener	listener
private static org.slf4j.Logger	logger
private MulticastConfiguration	multicastConfiguration
private DiscoverableService	service
private String	serviceName

Constructor Summary

Constructors

Constructor and Description
ClusterServiceDiscovery(String serviceName, InetSocketAddress multicastAddress, MulticastConfiguration multicastConfiguration, ProtocolContext<ProtocolMessage> protocolContext)

Method Summary

Methods

Modifier and Type	Method and Description
void	addHandler(ProtocolHandler handler) Registers a handler with the listener.
Collection<ProtocolHandler>	getHandlers()
InetSocketAddress	getMulticastAddress()
MulticastConfiguration	getMulticastConfiguration()
DiscoverableService	getService()
String	getServiceName()
boolean	isRunning()
private String	prettyPrint(InetSocketAddress address)
boolean	removeHandler(ProtocolHandler handler) Unregisters the handler with the listener.
void	setBulletinRepository(BulletinRepository bulletinRepository) Sets the BulletinRepository that can be used to report bulletins
void	start() Starts the instance for listening for messages.
void	stop() Stops the instance from listening for messages.

Methods inherited from class java.lang.Object

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

Field Detail

logger

private static final org.slf4j.Logger logger

serviceName

private final String serviceName

multicastConfiguration

private final MulticastConfiguration multicastConfiguration

listener

private final MulticastProtocolListener listener

bulletinRepository

private volatile BulletinRepository bulletinRepository

service

private DiscoverableService service

Constructor Detail

ClusterServiceDiscovery

public ClusterServiceDiscovery(String serviceName,
                       InetSocketAddress multicastAddress,
                       MulticastConfiguration multicastConfiguration,
                       ProtocolContext<ProtocolMessage> protocolContext)

Method Detail

setBulletinRepository

public void setBulletinRepository(BulletinRepository bulletinRepository)

Description copied from interface: ProtocolListener

Sets the BulletinRepository that can be used to report bulletins

Specified by:

setBulletinRepository in interface ProtocolListener

Parameters:

bulletinRepository - repo

getService

public DiscoverableService getService()

Specified by:

getService in interface ServiceDiscovery

getMulticastAddress

public InetSocketAddress getMulticastAddress()

Specified by:

getMulticastAddress in interface MulticastServiceDiscovery

getHandlers

public Collection<ProtocolHandler> getHandlers()

Specified by:

getHandlers in interface ProtocolListener

Returns:

the handlers registered with the listener

addHandler

public void addHandler(ProtocolHandler handler)

Description copied from interface: ProtocolListener

Registers a handler with the listener.

Specified by:

addHandler in interface ProtocolListener

Parameters:

handler - a handler

removeHandler

public boolean removeHandler(ProtocolHandler handler)

Description copied from interface: ProtocolListener

Unregisters the handler with the listener.

Specified by:

removeHandler in interface ProtocolListener

Parameters:

handler - a handler

Returns:

true if the handler was removed; false otherwise

isRunning

public boolean isRunning()

Specified by:

isRunning in interface ProtocolListener

Returns:

true if the instance is started; false otherwise.

start

public void start()
           throws IOException

Description copied from interface: ProtocolListener

Starts the instance for listening for messages. Start may only be called if the instance is not running.

Specified by:

start in interface ProtocolListener

Throws:

IOException - ex

stop

public void stop()
          throws IOException

Description copied from interface: ProtocolListener

Stops the instance from listening for messages. Stop may only be called if the instance is running.

Specified by:

stop in interface ProtocolListener

Throws:

IOException - ex

getServiceName

public String getServiceName()

getMulticastConfiguration

public MulticastConfiguration getMulticastConfiguration()

prettyPrint

private String prettyPrint(InetSocketAddress address)