org.fabric3.binding.zeromq.runtime.message

Class NonReliableSubscriber

java.lang.Object

org.fabric3.binding.zeromq.runtime.message.NonReliableSubscriber

All Implemented Interfaces:

Subscriber, org.fabric3.spi.federation.addressing.AddressListener

public class NonReliableSubscriber
extends java.lang.Object
implements Subscriber, org.fabric3.spi.federation.addressing.AddressListener

Implements a basic SUB server with no qualities of service.

Since ZeroMQ requires the creating socket thread to receive messages, a polling thread is used for connecting to one or more publishers and receiving messages. The subscriber listens for address updates (e.g. a publisher coming online or going away). Since ZeroMQ does not implement disconnect semantics on a socket, if an update is received the original socket will be closed and a new one created to connect to the update set of addresses.

Constructor Summary

Constructors

Constructor and Description
NonReliableSubscriber(java.lang.String id, ContextManager manager, java.util.List<org.fabric3.spi.federation.addressing.SocketAddress> addresses, org.fabric3.spi.container.channel.EventStreamHandler head, org.fabric3.api.binding.zeromq.model.ZeroMQMetadata metadata, java.util.concurrent.ExecutorService executorService) Constructor

Method Summary

Methods

Modifier and Type	Method and Description
void	decrementConnectionCount() Decrements the connection count.
java.util.List<java.lang.String>	getAddresses()
java.lang.String	getId()
boolean	hasConnections() True if this subscriber has active consumer connections.
void	incrementConnectionCount() Increments the connection count.
void	onUpdate(java.util.List<org.fabric3.spi.federation.addressing.SocketAddress> addresses)
void	start() Initializes the server and its underlying socket.
void	stop() Disposes the server and any open resources.

Methods inherited from class java.lang.Object

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

Constructor Detail

NonReliableSubscriber

public NonReliableSubscriber(java.lang.String id,
                     ContextManager manager,
                     java.util.List<org.fabric3.spi.federation.addressing.SocketAddress> addresses,
                     org.fabric3.spi.container.channel.EventStreamHandler head,
                     org.fabric3.api.binding.zeromq.model.ZeroMQMetadata metadata,
                     java.util.concurrent.ExecutorService executorService)

Constructor

Parameters:

id - the unique subscriber id, typically the consumer URI.

manager - the ZeroMQ context manager

addresses - the publisher addresses the subscriber must connect to

head - the head handler for dispatching events

metadata - subscriber metadata

executorService - the executor for scheduling work

Method Detail

start

public void start()

Description copied from interface: Subscriber

Initializes the server and its underlying socket.

Specified by:

start in interface Subscriber

stop

public void stop()

Description copied from interface: Subscriber

Disposes the server and any open resources.

Specified by:

stop in interface Subscriber

getAddresses

public java.util.List<java.lang.String> getAddresses()

incrementConnectionCount

public void incrementConnectionCount()

Description copied from interface: Subscriber

Increments the connection count.

Specified by:

incrementConnectionCount in interface Subscriber

decrementConnectionCount

public void decrementConnectionCount()

Description copied from interface: Subscriber

Decrements the connection count.

Specified by:

decrementConnectionCount in interface Subscriber

hasConnections

public boolean hasConnections()

Description copied from interface: Subscriber

True if this subscriber has active consumer connections.

Specified by:

hasConnections in interface Subscriber

Returns:

true if this subscriber has active consumer connections

getId

public java.lang.String getId()

Specified by:

getId in interface org.fabric3.spi.federation.addressing.AddressListener

onUpdate

public void onUpdate(java.util.List<org.fabric3.spi.federation.addressing.SocketAddress> addresses)

Specified by:

onUpdate in interface org.fabric3.spi.federation.addressing.AddressListener