Can I make a Poller start his cycle with WAIT after start() command?

Question

In my Integration Flow I change from standard flow to an error flow in some error condition, stopping the standardStateEntryPoint and starting the errorStateEntryPoint via sending the start/stop command messages to the Control Channel.

The errorStateEntryPoint is this:

@Bean
public IntegrationFlow errorStateEntryPoint() {
    return IntegrationFlows.from(
            () -> new GenericMessage<String>(""),
                    e -> e.poller(p -> p.fixedDelay(ERROR_STATE_POLLING))
                    .id("errorStateSourcePollingChannelAdapter")
                    .autoStartup(false))
            .channel("httpOutRequest")
            .get();
}

It has a Poller with a fixed delay of 5_000 ms. The recognized lifecycle when started is

send -> wait -> send -> wait etc.

Is it possible to have the inverse lifecycle, starting with the delay?

wait -> send -> wait -> send etc.

JBStonehenge · Accepted Answer · 2021-10-07T14:05:58.950

What I've found out:

You might set the initialDelay of the poller. If your poller has a period of 5.000 milliseconds without an initial delay, it is working this way:

send -> wait -> send -> wait  etc.

If you set the same 5.000 milliseconds as initial delay, it is working exactly as required:

wait -> send -> wait -> send etc.

The initial delay is the second argument setting p.fixedDelay(...). Then the errorStateEntryPoint polling channel adapter should be this:

@Bean
public IntegrationFlow errorStateEntryPoint() {
    return IntegrationFlows.from(
            () -> new GenericMessage<String>(""),
                    e -> e.poller(p -> p.fixedDelay(ERROR_STATE_POLLING, ERROR_STATE_POLLING))
                    .id("errorStateSourcePollingChannelAdapter")
                    .autoStartup(false))
            .channel("httpOutRequest")
            .get();
}

That's it.

Can I make a Poller start his cycle with WAIT after start() command?

1 Answers1