Spring Aggregator Annotation doesnot have expireGroupUponCompletion and persistenceStore as input

Question

I recently moved to Spring boot and started converting all the XMLs to Java Configs. The @Aggregate annotation does not have expireGroupUponCompletion and persistenceStore as the input. Is there any other way we can specify these things?

Artem Bilan · Accepted Answer · 2014-09-17T12:16:50.533

1

Is there any other way we can specify these things?

Using Spring Integration Java DSL:

.aggregate(a -> a.expireGroupsUponCompletion(true)
                 .sendPartialResultOnExpiry(true)
                 .messageStore(messageStore(), null)

The second null param means that we aren't interested in some endpoint customization and just rely on the defaul state. We left that syntax to avoid the explicit type for Lambda argument:

.aggregate((AggregatorSpec a) -> a.expireGroupsUponCompletion(true)
                 .sendPartialResultOnExpiry(true)
                 .messageStore(messageStore())

edited Sep 17 '14 at 12:16

answered Sep 17 '14 at 10:16

Artem Bilan

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But now if I add .sendPartialResultsOnExpiry(true) to the above chain, the code is not compiling :( And what does null at the end means? – Nikhil Sep 17 '14 at 11:54
Sorry i got it. I have to use .sendPartialResultOnExpiry(true) – Nikhil Sep 17 '14 at 11:58
Added explanation to the answer – Artem Bilan Sep 17 '14 at 12:17

score 1 · Answer 2 · answered Sep 18 '14 at 09:14

Thanks Artem.I am able to solve the problem with the following configuration.

    @Bean
public IntegrationFlow pollingFlow() {
    return IntegrationFlows.from(splitSegment())
                           .aggregate( a -> a
                                     .expireGroupsUponCompletion(true)
                                     .messageStore(persistenceMessageStore())
                                     .sendPartialResultOnExpiry(true)
                                     .discardChannel(aggregateSegments())
                                     .correlationStrategy(m -> m.getPayload())
                                     .releaseStrategy(g ->  g.getMessages().size() > 5)
                                     .outputProcessor(g -> {
                                                               CountDB ag = new CountDB();
                                                               ag.setId((Long) g.getOne().getPayload());
                                                               ag.setActiveUsers((long)g.getMessages().size());
                                                               return ag;
                                                            })
                                    ,
                                     null)
                           .channel(aggregateSegments())
                           .get();

Spring Aggregator Annotation doesnot have expireGroupUponCompletion and persistenceStore as input

2 Answers2