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INT-4538: Fix Splitter for ArrayNode.size()

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JIRA: https://jira.spring.io/browse/INT-4538

* Add support for Jackson `TreeNode.size()` in the `AbstractMessageSplitter`
* Add overloaded `Transformers.toJson(ObjectToJsonTransformer.ResultType)`
* Modify test to verify Jackson `ArrayNode` use-case with the splitter
and aggregator

**Cherry-pick to 5.0.x**
This commit is contained in:
Artem Bilan
2018-10-05 15:25:27 -04:00
committed by Gary Russell
parent 3a7a14140b
commit 7faeee849d
4 changed files with 49 additions and 10 deletions
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8
src/reference/asciidoc/splitter.adoc
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@@ -45,17 +45,17 @@ Since this decouples the code from the Spring Integration API and will typically
*Iterators*
Starting with _version 4.1_, the `AbstractMessageSplitter` supports the `Iterator` type for the `value` to split.
Starting with version 4.1, the `AbstractMessageSplitter` supports the `Iterator` type for the `value` to split.
Note, in the case of an `Iterator` (or `Iterable`), we don't have access to the number of underlying items and the `SEQUENCE_SIZE` header is set to `0`.
This means that the default `SequenceSizeReleaseStrategy` of an `<aggregator>` won't work and the group for the `CORRELATION_ID` from the `splitter` won't be released; it will remain as `incomplete`.
In this case you should use an appropriate custom `ReleaseStrategy` or rely on `send-partial-result-on-expiry` together with `group-timeout` or a `MessageGroupStoreReaper`.
Starting with _version 5.0_, the `AbstractMessageSplitter` provides `protected obtainSizeIfPossible()` methods to allow the determination of the size of the `Iterable` and `Iterator` objects if that is possible.
Starting with version 5.0, the `AbstractMessageSplitter` provides `protected obtainSizeIfPossible()` methods to allow the determination of the size of the `Iterable` and `Iterator` objects if that is possible.
For example `XPathMessageSplitter` can determine the size of the underlying `NodeList` object.
And starting with version 5.0.9, this method also properly returns a size of the `com.fasterxml.jackson.core.TreeNode`.
An `Iterator` object is useful to avoid the need for building an entire collection in the memory before splitting.
For example, when underlying items are populated from some external system (e.g.
DataBase or FTP `MGET`) using iterations or streams.
For example, when underlying items are populated from some external system (e.g. DataBase or FTP `MGET`) using iterations or streams.
*Stream and Flux*