Package de.otto.synapse.consumer

Class MessageDispatcher

java.lang.Object

de.otto.synapse.consumer.MessageDispatcher

All Implemented Interfaces:

Consumer<TextMessage>

public class MessageDispatcher
extends Object
implements Consumer<TextMessage>

A MessageConsumer that is acting as a Message Dispatcher for multiple message consumers.

As it is implementing the MessageConsumer interface, the MessageDispatcher is an implementation of the GoF Composite Pattern.

Messages are translated by the dispatcher using to the format expected by the registered consumers.

See Also:

• EIP: Message Dispatcher
• Composite Pattern

Constructor Summary

Constructors

Constructor	Description
MessageDispatcher()
MessageDispatcher(List<MessageConsumer<?>> messageConsumers)

Method Summary

Modifier and Type	Method	Description
void	accept(TextMessage message)	Accepts a message with JSON String payload, dispatches this method to the different registered consumers if their MessageConsumer.keyPattern() matches, and translates the JSON payload into the expected MessageConsumer.payloadType() of the receiving MessageConsumer.
void	add(MessageConsumer<?> messageConsumer)
List<MessageConsumer<?>>	getAll()
Pattern	keyPattern()	Returns the pattern of event keys accepted by this consumer.
Class<String>	payloadType()	Returns the expected payload type of events consumed by this EventConsumer.

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.function.Consumer

andThen

Constructor Details

MessageDispatcher

public MessageDispatcher()

MessageDispatcher

public MessageDispatcher(List<MessageConsumer<?>> messageConsumers)

Method Details

add

public void add(MessageConsumer<?> messageConsumer)

getAll

public List<MessageConsumer<?>> getAll()

payloadType

@Nonnull
public Class<String> payloadType()

Returns the expected payload type of events consumed by this EventConsumer.

Returns:

payload type

keyPattern

@Nonnull
public Pattern keyPattern()

Returns the pattern of event keys accepted by this consumer.

Returns:

Pattern

accept

public void accept(TextMessage message)

Accepts a message with JSON String payload, dispatches this method to the different registered consumers if their MessageConsumer.keyPattern() matches, and translates the JSON payload into the expected MessageConsumer.payloadType() of the receiving MessageConsumer.

Specified by:

accept in interface Consumer<TextMessage>

Parameters:

message - the input argument