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Diffstat (limited to 'docs/tutorials/wiki/basiclayout.rst')
| -rw-r--r-- | docs/tutorials/wiki/basiclayout.rst | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/docs/tutorials/wiki/basiclayout.rst b/docs/tutorials/wiki/basiclayout.rst index 884f17840..7fe7daac8 100644 --- a/docs/tutorials/wiki/basiclayout.rst +++ b/docs/tutorials/wiki/basiclayout.rst @@ -187,6 +187,11 @@ The ``egg:repoze.zodbconn#closer`` middleware is in the middle of the pipeline. This is a piece of middleware which closes the ZODB connection opened by the ``PersistentApplicationFinder`` at the end of the request. +The ``egg:repoze.retry#retry`` middleware catches ``ConflictError`` +exceptions from ZODB and retries the request up to three times (ZODB is an +optimistic concurrency database that relies on application-level transaction +retries when a conflict occurs). + The ``tm`` middleware is the last piece of middleware in the pipeline. This commits a transaction near the end of the request unless there's an exception raised or the HTTP response code is an error code. The ``tm`` refers to the |