Package org.springframework.amqp.rabbit.batch

Class SimpleBatchingStrategy

java.lang.Object

org.springframework.amqp.rabbit.batch.SimpleBatchingStrategy

All Implemented Interfaces:

BatchingStrategy

public class SimpleBatchingStrategy
extends Object
implements BatchingStrategy

A simple batching strategy that supports only one exchange/routingKey; includes a batch size, a batched message size limit and a timeout. The message properties from the first message in the batch is used in the batch message. Each message is preceded by a 4 byte length field.

Since:

1.4.1

Author:

Gary Russell, Ngoc Nhan

Constructor Summary

Constructors

Constructor	Description
SimpleBatchingStrategy(int batchSize, int bufferLimit, long timeout)

Method Summary

Modifier and Type	Method	Description
MessageBatch	addToBatch(String exch, String routKey, Message message)	Add a message to the batch and optionally release the batch.
boolean	canDebatch(MessageProperties properties)	Return true if this strategy can decode a batch of messages from a message body.
void	deBatch(Message message, Consumer<Message> fragmentConsumer)	Debatch a message that has a header with MessageProperties.SPRING_BATCH_FORMAT set to MessageProperties.BATCH_FORMAT_LENGTH_HEADER4.
Date	nextRelease()
Collection<MessageBatch>	releaseBatches()	Release batch(es), perhaps due to a timeout.

Methods inherited from class java.lang.Object

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

Constructor Details

SimpleBatchingStrategy

public SimpleBatchingStrategy(int batchSize,
 int bufferLimit,
 long timeout)

Parameters:

batchSize - the batch size.

bufferLimit - the max buffer size; could trigger a short batch. Does not apply to a single message.

timeout - the batch timeout.

Method Details

addToBatch

public MessageBatch addToBatch(String exch,
 String routKey,
 Message message)

Description copied from interface: BatchingStrategy

Add a message to the batch and optionally release the batch.

Specified by:

addToBatch in interface BatchingStrategy

Parameters:

exch - The exchange.

routKey - The routing key.

message - The message.

Returns:

The batched message (MessageBatch), or null if not ready to release.

nextRelease

public Date nextRelease()

Specified by:

nextRelease in interface BatchingStrategy

Returns:

the date the next scheduled release should run, or null if no data to release.

releaseBatches

public Collection<MessageBatch> releaseBatches()

Description copied from interface: BatchingStrategy

Release batch(es), perhaps due to a timeout.

Specified by:

releaseBatches in interface BatchingStrategy

Returns:

The batched message(s).

canDebatch

public boolean canDebatch(MessageProperties properties)

Description copied from interface: BatchingStrategy

Return true if this strategy can decode a batch of messages from a message body. Returning true means you must override BatchingStrategy.deBatch(Message, Consumer).

Specified by:

canDebatch in interface BatchingStrategy

Parameters:

properties - the message properties.

Returns:

true if we can decode the message.

See Also:

• BatchingStrategy.deBatch(Message, Consumer)

deBatch

public void deBatch(Message message,
 Consumer<Message> fragmentConsumer)

Debatch a message that has a header with MessageProperties.SPRING_BATCH_FORMAT set to MessageProperties.BATCH_FORMAT_LENGTH_HEADER4.

Specified by:

deBatch in interface BatchingStrategy

Parameters:

message - the batched message.

fragmentConsumer - a consumer for each fragment.

Since:

2.2

See Also:

• BatchingStrategy.canDebatch(MessageProperties)