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https://issues.apache.org/jira/browse/SOLR-399?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Henri Biestro updated SOLR-399:
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Attachment: solr-399.patch
The patch is not yet functional (tests fail).
> SolrConfig.Initializable: allow configurable class instances to depend on the
> SolrCore instance
> -----------------------------------------------------------------------------------------------
>
> Key: SOLR-399
> URL: https://issues.apache.org/jira/browse/SOLR-399
> Project: Solr
> Issue Type: Improvement
> Reporter: Henri Biestro
> Priority: Minor
> Fix For: 1.3
>
> Attachments: solr-399.patch
>
>
> WHAT:
> This patch introduces initialization behaviors for instances of configurable
> classes.
> WHY:
> Introduced through solr-215, SolrConfig.Initializable allows some classes
> (Tokenizer, Filter) to get access to the SolrConfig at initialization time.
> It would be convenient to extend this so that instances of configurable
> classes could access objects known by the core - and thus the schema .
> see http://www.nabble.com/SolrConfig.Initializable-tf4665036.html
> HOW:
> SolrConfig is extended to declare some new initialization dedicated
> interfaces (Initializable, InitializablePlugin, InitializableBy) that classes
> wishing to benefit from the initialization behaviors need to implement.
> SolrCore.Initializable interface is also introduced for the same purpose. All
> those interfaces require the implementation of some 'init' method.
> It is guaranteed that:
> 1/ SolrConfig.Initializable*.init is called before SolrCore.Initializable.init
> 2/ SolrCore.Initializable.init is guaranteed to be called only once when it
> is successful at core initialization time.
> When the core is being initialized, all instances that go through
> SolrConfig.initInstance that are SolrCore.Initializable are queued into an
> initialization list that guarantees uniqueness (aka they are only queued
> once).
> At the end of core initialization, the solrConfig.init(core) is called; this
> triggers the call to SolrCore.Initializable.init(core) for each queued
> instances. That method must be implemented to return 'true' if the
> initialization has been performed, 'false' if it must be re-evaluated. This
> allows one instance to depend on another initialization (a tokenizer could
> require a fieldType).
> Solrconfig will loop around the queue while it can successfully initialize
> instances or new ones are posted; if the loop can not reduce the number of
> instances expecting initialization, it is considered an error (and this will
> avoid potentially cyclic dependencies).
> After the core has been initialized, the SolrConfig will automatically post
> instance to the SolrCore queue & empty it right away with the same behavior.
> Note that after the core has been initiallized, the SolrConfig is bound to
> that core; reusing such a bound SolrConfig for another core will generate an
> exception.
> USAGE:
> Any class that implements one of SolrConfig.Init* interface implements some
> 'init' method that will be called through SolrConfig.
> The sequence of call is:
> SolrConfig.Initializable instance = solrConfig.newInstance("name.of.class");
> ...
> solrConfig.initInstance(instance, args);
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