[
https://issues.apache.org/jira/browse/JENA-1249?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Andy Seaborne updated JENA-1249:
--------------------------------
Attachment: ReportPerf.java
A test program showing the costs of getPrefixes for TDB.
> ModelCom constuction triggers prefix reading in TDB
> ---------------------------------------------------
>
> Key: JENA-1249
> URL: https://issues.apache.org/jira/browse/JENA-1249
> Project: Apache Jena
> Issue Type: Bug
> Reporter: Andy Seaborne
> Attachments: ReportPerf.java
>
>
> For TDB, the Dataset-level wrapper is {{DatasetImpl}}. The model-level
> operations {{Dataset.getDefaultModel}} and {{Dataset.getNamedModel}} use a
> {{ModelCom}} to wrap the graph.
> The {{ModelCom}} construct also calls {{ModelCom.getPrefixMapping}} which in
> turn triggers the TDB graph level prefix mapping to be created.
> Due to JENA-81, the prefix map is read to the cache when the graph starts.
> Overall result - creating the model causes the prefix mappings to be read.
> We should avoid calling {{getPrefixMapping}} inside the {{ModelCom}}
> constructor.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
