Package com.rabbitmq.stream

Interface ConsumerBuilder

public interface ConsumerBuilder

API to configure and create a Consumer.

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static interface	ConsumerBuilder.AutoTrackingStrategy	Auto-tracking strategy.
static interface	ConsumerBuilder.FilterConfiguration	Filter configuration.
static interface	ConsumerBuilder.FlowConfiguration	Message flow configuration.
static interface	ConsumerBuilder.ManualTrackingStrategy	Manual tracking strategy.

Method Summary

Modifier and Type	Method	Description
ConsumerBuilder.AutoTrackingStrategy	autoTrackingStrategy()	Enable ConsumerBuilder.AutoTrackingStrategy.
Consumer	build()	Create the configured Consumer
ConsumerBuilder	consumerUpdateListener(ConsumerUpdateListener consumerUpdateListener)	Set the listener for single active consumer updates.
ConsumerBuilder.FilterConfiguration	filter()	Configure the filtering.
ConsumerBuilder.FlowConfiguration	flow()	Configure flow of messages.
ConsumerBuilder.ManualTrackingStrategy	manualTrackingStrategy()	Enable ConsumerBuilder.ManualTrackingStrategy.
ConsumerBuilder	messageHandler(MessageHandler messageHandler)	The callback for inbound messages.
ConsumerBuilder	name(String name)	The logical name of the Consumer.
ConsumerBuilder	noTrackingStrategy()	Disable server-side offset tracking.
ConsumerBuilder	offset(OffsetSpecification offsetSpecification)	The offset to start consuming from.
ConsumerBuilder	singleActiveConsumer()	Declare the consumer as a single active consumer.
ConsumerBuilder	stream(String stream)	The stream to consume from.
ConsumerBuilder	subscriptionListener(SubscriptionListener subscriptionListener)	Callback on subscription.
ConsumerBuilder	superStream(String superStream)	Set the consumer to consume from a super stream (partitioned stream).

Method Detail

stream

ConsumerBuilder stream(String stream)

The stream to consume from.

Parameters:

stream -

Returns:

this builder instance

superStream

ConsumerBuilder superStream(String superStream)

Set the consumer to consume from a super stream (partitioned stream).

This is meant to be used with singleActiveConsumer().

This is an experimental API, subject to change.

RabbitMQ 3.11 or more is required.

Parameters:

superStream -

Returns:

this builder instance

See Also:

singleActiveConsumer()

offset

ConsumerBuilder offset(OffsetSpecification offsetSpecification)

The offset to start consuming from.

The default is OffsetSpecification.next() (the end of the stream).

Parameters:

offsetSpecification -

Returns:

this builder instance

messageHandler

ConsumerBuilder messageHandler(MessageHandler messageHandler)

The callback for inbound messages.

Parameters:

messageHandler -

Returns:

this builder instance

name

ConsumerBuilder name(String name)

The logical name of the Consumer.

Set a logical name to enable offset tracking.

Parameters:

name -

Returns:

this builder instance

singleActiveConsumer

ConsumerBuilder singleActiveConsumer()

Declare the consumer as a single active consumer.

A single active consumer must set up a name with name(String).

Instances of the same application can declare several single active consumer instances with the same name and only one will be active at a time, meaning it will be the only one to get messages from the broker.

If the active consumer instance stops or crashes, the broker will choose a new active instance among the remaining ones.

This is an experimental API, subject to change.

RabbitMQ 3.11 or more is required.

Returns:

this builder instance

Since:

0.6.0

See Also:

name(String)

consumerUpdateListener

ConsumerBuilder consumerUpdateListener(ConsumerUpdateListener consumerUpdateListener)

Set the listener for single active consumer updates.

This listener is usually set when manual offset tracking is used, either server-side or with an external datastore.

This is an experimental API, subject to change.

RabbitMQ 3.11 or more is required.

Parameters:

consumerUpdateListener -

Returns:

this builder instance

Since:

0.6.0

See Also:

singleActiveConsumer(), ConsumerUpdateListener, manualTrackingStrategy()

subscriptionListener

ConsumerBuilder subscriptionListener(SubscriptionListener subscriptionListener)

Callback on subscription.

Can be used to set the offset specification before subscribing to the stream.

This is an experimental API, subject to change.

Parameters:

subscriptionListener - the listener

Returns:

this builder instance

Since:

0.5.0

See Also:

SubscriptionListener

manualTrackingStrategy

ConsumerBuilder.ManualTrackingStrategy manualTrackingStrategy()

Enable ConsumerBuilder.ManualTrackingStrategy.

Returns:

the manual tracking strategy

autoTrackingStrategy

ConsumerBuilder.AutoTrackingStrategy autoTrackingStrategy()

Enable ConsumerBuilder.AutoTrackingStrategy.

This is the default tracking strategy.

Returns:

the auto-tracking strategy

noTrackingStrategy

ConsumerBuilder noTrackingStrategy()

Disable server-side offset tracking.

Useful when singleActiveConsumer() is enabled and an external store is used for offset tracking. This avoids automatic server-side offset tracking to kick in.

Returns:

this builder instance

Since:

0.6.0

filter

ConsumerBuilder.FilterConfiguration filter()

Configure the filtering.

RabbitMQ 3.13 or more is required.

Returns:

the filtering configuration

flow

ConsumerBuilder.FlowConfiguration flow()

Configure flow of messages.

Returns:

the flow configuration

Since:

0.11.0

See Also:

ConsumerFlowStrategy.creditOnChunkArrival(), MessageHandler.Context.processed()

build

Consumer build()

Create the configured Consumer

Returns:

the configured consumer