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INT-4471: PubSubChannel: Add errorHandler warn (#2459)

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* INT-4471: PubSubChannel: Add errorHandler warn

JIRA: https://jira.spring.io/browse/INT-4471

* When an `Executor` is not provided, log warn that the provided
`ErrorHandler` is ignored.

**Cherry-pick to 5.0.x and 4.3.x**

* * Polish warn message
This commit is contained in:
Artem Bilan
2018-05-31 15:25:38 -04:00
committed by Gary Russell
parent 9a88140fb3
commit 17e794d2c8
4 changed files with 45 additions and 51 deletions
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4
src/reference/asciidoc/channel.adoc
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@@ -572,6 +572,10 @@ When using this element, you can also specify the `task-executor` used for publi
<int:publish-subscribe-channel id="pubsubChannel" task-executor="someExecutor"/>
----
Alongside with the `Executor`, an `ErrorHandler` can be configured as well.
By default the `PublishSubscribeChannel` uses a `MessagePublishingErrorHandler` implementation to send error to the `MessageChannel` from the `errorChannel` header or a global `errorChannel` instance.
If an `Executor` is not configured, the `ErrorHandler` is ignored and exceptions are thrown directly to the caller's Thread.
If you are providing a _Resequencer_ or _Aggregator_ downstream from a `PublishSubscribeChannel`, then you can set the 'apply-sequence' property on the channel to `true`.
That will indicate that the channel should set the sequence-size and sequence-number Message headers as well as the correlation id prior to passing the Messages along.
For example, if there are 5 subscribers, the sequence-size would be set to 5, and the Messages would have sequence-number header values ranging from 1 to 5.