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https://jira.duraspace.org/browse/DSCR-22?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robin Taylor resolved DSCR-22.
------------------------------
Resolution: Fixed
To be released as part of the wider DSpace 1.8 release.
> Discovery module back end rewrite to support discovery without solr.
> --------------------------------------------------------------------
>
> Key: DSCR-22
> URL: https://jira.duraspace.org/browse/DSCR-22
> Project: DSpace Discovery Module
> Issue Type: Improvement
> Reporter: Kevin Van de Velde
> Assignee: Mark Diggory
> Priority: Major
> Attachments: Discovery_implementation_independent_of_solr v0.1.patch
>
>
> The goal of this task was twofold.
> 1) Ensure that discovery doesn't have to use solr as a backend, in other
> words ensure that user can plug in their own backend implementation.
> 2) Rewrite some of the code to make it more logical (example: the sidebar
> filters for a community page where rendered because the
> CommunityRecentSubmissionsTransformer extended the
> AbstractsFiltersTransformer => logically these are 2 completely different
> things).
> This task focuses completely on these 2 point. Please bear mind that almost
> nothing in the UI has been changed. While programming this task I also had a
> minor feature request which I implemented namely the following:
> The autocomplete filters can be configured to not split words on a space,
> this is particularly useful for authors. The changes are briefly described
> below.
> a) A new discovery sub module has been created named "dspace-discovery-solr"
> this module is the only module that contains any solr dependencies and
> contains the old " SolrServiceImpl" class and the
> spring-dspace-addon-discovery-services.xml spring file. This module is used
> by default and ensures that a discovery out of the box will still work. None
> of the other discovery modules have dependencies on this module so it can be
> replaced very easily.
> b) The "dspace-discovery-provider" module has lost the all the solr
> dependencies as explained and the "SearchService" interface has undergone
> some changes, the search methods don't require a solrQuery anymore and do not
> return a solrResult.
> Instead 2 new objects have been created
> * DiscoverQuery: will hold all query information
> * DiscoverResult: will contain the resulting dspace objects and/or the facets
> By doing things this way any programmer can implement the search service and
> write their own backend.
> c) All the user interface classes have been rewritten to support these new
> objects.
> d) One logical change was also made namely the following:
> The abstractFilters class has been transformed into the
> "SidebarFacetsTransformer". The facets will still appear on the same places,
> but unlike earlier where the only reason the community had sidebar facets was
> that the "CommunityRecentSubmissions" class extended the filters class the
> SidebarFacetsTransformer is now called on each community page. I did this
> because it just makes more sense that way.
> e) I also added an extra method to indexing implementation of solr, named "
> indexItemFieldCustom" should it ever be required to adjust some simple
> indexing task the entire " SolrServiceImpl" does not need to be overwritten.
> One simply extends the class and implement that method (a boolean is returned
> which can prevent further indexing of the metadata field).
> There is one thing that remains unfinished and that is the related items, I'm
> still thinking on the best way to implement that with the
> DiscoveryQuery/DiscoveryResult objects, if anybody has some suggestion I'm
> always willing to listen.
> Please bear in mind when testing with this patch that solr schema has been
> altered and a complete forced re-index of discovery is required.
> Once this patch (after some changes & small improvements) gets committed I
> will start work to ensure that discovery will use the configurationService
> instead of its own configuration methods.
> Ps: this patch also includes a bugfix for the following JIRA task:
> https://jira.duraspace.org/browse/DS-868
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