davsclaus opened a new pull request, #26626:
URL: https://github.com/apache/camel/pull/26626
## Description
The runtime half of CAMEL-24844, the cheap part. The body's class at each
step existed only in the backlog tracer's dumps (`body.type` in
`MessageHelper.dumpAsJSon`), so it was there for the last completed exchange in
dev mode and nowhere else; the message history proper carried node and elapsed
time only.
`MessageHistory` gets two default methods, `getBodyType()` (the canonical
class of the body as the node was reached, null when not captured) and
`getBodySize()` (bytes, -1 when not captured or unknown).
`DefaultMessageHistoryFactory` fills them when history is on: the type is one
`getClass()`, the size is the `MessageSizeStrategy`'s (lengths of bytes,
strings, stream caches and files, element counts of collections; no reading, no
conversion) and only when that strategy is enabled, which the dev profile does.
No message copy.
The Message History table printed with a failure gains two columns:
```
Source ID
Processor Elapsed (ms) Body type
Size
route1/route1 ...
route1/a ...
java.lang.String
11
route1/b ...
byte[]
11
route1/c ...
java.util.ArrayList
3
```
so a person or a model reading a failure sees where the body turned from
text into a Map or bytes, on every message, without the tracer. A custom
`MESSAGE_HISTORY_HEADER_FORMAT` / `MESSAGE_HISTORY_OUTPUT_FORMAT` with the old
four placeholders keeps working (the extra arguments are ignored by
`String.format`).
Next, as follow-ups: the exception messages name the type reaching the step
from the history ("the body reaching this step is a java.util.LinkedHashMap,
set by unmarshal at line 12"), and the TUI and the camel-jbang-mcp history tool
show the two columns.
## Tests
- `MessageHistoryBodyTypeAndSizeTest`: a route where the body goes from text
to bytes to a list, the type and size per step, and both columns in the table.
- The existing message history and `MessageHelper` tests of camel-core green
(24).
🤖 Generated with [Claude Code](https://claude.com/claude-code)
https://claude.ai/code/session_01Bp3538HRBPMQkb5ta9xRaj
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