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https://issues.apache.org/jira/browse/OLINGO-124?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Bolz closed OLINGO-124.
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> Caching of metadata document
> ----------------------------
>
> Key: OLINGO-124
> URL: https://issues.apache.org/jira/browse/OLINGO-124
> Project: Olingo
> Issue Type: Question
> Components: odata2-core
> Affects Versions: V2 1.0.0
> Reporter: M Carissimi
> Assignee: Michael Bolz
> Priority: Minor
>
> We generate the metadata at runtime using custom database queries and in
> odata4j we can cache the metadata document to avoid having to rebuild it
> every time a request is received. How can metadata be cached between requests
> in olingo? Following the simple read example on the olingo website, we use an
> ODataServiceFactory to create a service using method
> createODataSingleProcessorService(), but these methods are invoked during
> each request.
> Hello Michael,
> the only remaining question I have is about caching of the schemas. I have
> already attempted to cache the schema list in my custom EdmProvider in the
> getSchemas() method, but this has had no effect.
> {code}
> private List<Schema> schemas = new ArrayList<Schema>();
> ...
> public List<Schema> getSchemas() throws ODataException
> {
> if (schemas.size() == 0)
> {
> Schema schema = new Schema();
> ...
> schemas.add(schema);
> }
> return schemas;
> }
> {code}
> Running the code in debugging mode, I can see that method createService() of
> the service factory class configured as initi-parameter of the
> CXFNonSpringJaxrsServlet servlet is invoked during each invocation and this
> forces the creation of a new EdmProvider class on each invocation
> {code}
> private ODataService theODataService = null;
> ...
> @Override
> public ODataService createService(ODataContext ctx) throws ODataException
> {
> if (theODataService == null)
> {
> EdmProvider edmProvider = new ResourceNoLinksProvider();
> ODataSingleProcessor singleProcessor = new ResourceSingleProcessor();
> theODataService = createODataSingleProcessorService(edmProvider,
> singleProcessor);
> }
> return theODataService;
> }
> {code}
> Do you have any other suggestion about caching the schemas or metadata? In
> odata4j, we were able to cache the metadata represented by EdmDataServices
> using a similar approach to the one above. The main difference is that the
> factory class was invoked by Jesey rather than CXF.
> Regards
> Miki
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