org.apache.camel

Interface BatchConsumer

All Superinterfaces:

Consumer, Service

All Known Implementing Classes:

FileConsumer, GenericFileConsumer, ScheduledBatchPollingConsumer

public interface BatchConsumer
extends Consumer

A consumer of a batch of message exchanges from an Endpoint

Version:

Method Summary

Methods

Modifier and Type	Method and Description
boolean	isBatchAllowed() Whether processing the batch is still allowed.
int	processBatch(Queue<Object> exchanges) Processes the list of Exchange objects in a batch.
void	setMaxMessagesPerPoll(int maxMessagesPerPoll) Sets a maximum number of messages as a limit to poll at each polling.

Methods inherited from interface org.apache.camel.Consumer

getEndpoint

Methods inherited from interface org.apache.camel.Service

start, stop

Method Detail

setMaxMessagesPerPoll

void setMaxMessagesPerPoll(int maxMessagesPerPoll)

Sets a maximum number of messages as a limit to poll at each polling.

Can be used to limit e.g. to 100 to avoid reading thousands or more messages within the first polling at startup.

Is default unlimited, but use 0 or negative number to disable it as unlimited.

Parameters:

maxMessagesPerPoll - maximum messages to poll.

processBatch

int processBatch(Queue<Object> exchanges)
                 throws Exception

Processes the list of Exchange objects in a batch.

Each message exchange will be processed individually but the batch consumer will add properties with the current index and total in the batch. The items in the Queue may actually be Holder objects that store other data alongside the Exchange.

Parameters:

exchanges - list of items in this batch

Returns:

number of messages actually processed

Throws:

Exception - if an internal processing error has occurred.

isBatchAllowed

boolean isBatchAllowed()

Whether processing the batch is still allowed.

This is used during shutdown to indicate whether to complete the pending exchanges or stop after the current exchange has been processed.

Returns:

true to continue processing from the batch, or false to stop.

See Also:

ShutdownRunningTask