GitHub user afs opened a pull request:
https://github.com/apache/jena/pull/109
Introduce interface TransactionalComponent.
Mantis has a more general concept of transaction. As part of that, it
differentiates between `Transactional` (the view from users of a transaction
system) and `TransactionalComponent` (units of code that participate in
providing transactionality).
See [the code for
TransactionalComponent](https://github.com/afs/mantis/blob/master/dboe-transaction/src/main/java/org/seaborne/dboe/transaction/txn/TransactionalComponent.java)
-- for example, that has a explicit `Transaction` object and only the upper
layers manage the `Transaction` by thread.
For the in-memory dataset, the difference is currently small but
introducing this now prepares for more complex setups, without disturbing
`Transactional`. It also removes the need for components to know whether they
are in a transaction or not; that is a concept of the coordinator function
currently in `DatasetGraphInMemory`. During times of state change, some
components may be in different states to others, making the idea of a component
being "in a transaction" imprecise. It also removes 11 ThreadLocals that were
not used except in testing. The testing is adapted.
To use individual components on their own (if ever needed) then a simple
wrapper that provides `Transactional` over a single component is a better
design as it separates the roles of collection and component. Included is
`TransactionalOfOne` but that is just illustrative and not for inclusion.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/afs/jena txnmem
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/jena/pull/109.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #109
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commit 39cf986fee9347c1920354b3fbddfed298bee8be
Author: Andy Seaborne <[email protected]>
Date: 2015-12-14T12:47:24Z
Use counting inside and outside a transaction to see what's happened.
commit a086675b27d0875126493bdd9f1e4247b87a2bb2
Author: Andy Seaborne <[email protected]>
Date: 2015-12-14T12:48:18Z
Introduce interface TransactionalComponent.
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