Aklakan commented on PR #3511:
URL: https://github.com/apache/jena/pull/3511#issuecomment-3633553744
I think there are three meaningful policies for how to pass on transactions
when doing
```java
DatasetGraphOverRDFLink dsg = new DatasetGraphOverRDFLink(linkCreator);
RDFLink frontLink = RDFLink.connect(dsg);
RDFLink backingLink = dsg.newLink(); // Calls linkCreator.create()
```
* Link-per-execution: Every query exec obtained from the front facing link,
such as via `QueryExec qe = frontLink.query(...)`, is backed by a fresh backing
link (`dsg.newLink()`) that is closed when `qe` is closed.
* Pass through: `RDFLink.connect(dsg)` returns the same link returned by
`dsg.newLink()`. This is currently unsupported because it would require
adapting `RDFLink.connect`.
* Thread-local-links: `dsg.begin()` will open a link via `dsg.newLink()` and
place it into a ThreadLocal. All further API calls will go to that backing link
until `dsg.end()` is called.
The behavior should be the same as pass-through. The only difference is,
that the link returned by `RDFLink.connect` is a wrapper that delegates to the
backing link in dsg's thread local.
I updated the code of `DatasetGraphOverRDFLink` with an internal
`TransactionalOverRDFLink` class for the thread-local-links policy.
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