@ReleaseStrategy - Spring Integration - Custom implementation

Please let me know if there is way to define @ReleaseStrategy with MessageGroup and associate it with @Aggregator.

I have POJO defined as below but not sure how would I associate a @Aggregator to it

public class FooReleaseStrategy {

      @ReleaseStrategy
      public boolean canRelease(MessageGroup group) {
         return group.isComplete();
      }

}

I have @Aggregator and @CorrelationStratgy defined part of configuration.

      @Aggregator(inputChannel="sftpChannel" outputChannel="aggregateChannel")
         public List<Message<?>> aggregateFiles(List<Message<?>> messages) {
         return messages;
      }

@CorrelationStrategy based on filename.

Would be very helpful if someone can shed some light on @ReleaseStrategy association with example if possible.

Based on the comments, I am planning on the create a aggregator factory bean to see if works for my use-case

    @Bean
    @ServiceActivator(inputChannel = "sftpChannel")
    public FactoryBean<MessageHandler> aggregatorFactoryBean( ) {
        AggregatorFactoryBean aggregatorBean = new AggregatorFactoryBean();
        aggregatorBean.setProcessorBean(new CustomAggregator());
        aggregatorBean.setMethodName("aggregate");
        aggregatorBean.setMessageStore(new SimpleMessageStore());
        aggregatorBean.setReleaseStrategy(messageGroup -> {
            return messageGroup.isComplete();
        });
        aggregatorBean.setOutputChannel(aggregatorFileChannel());
        aggregatorBean.setExpireGroupsUponTimeout(true);
        aggregatorBean.setGroupTimeoutExpression(new ValueExpression<>(1000L));
        aggregatorBean.setSendPartialResultOnExpiry(false);
        aggregatorBean.setExpireGroupsUponCompletion(true);
        return aggregatorBean;
    }