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From Mark Robinson <>
Subject Re: Load a java class on start up
Date Sat, 02 Jul 2016 09:52:47 GMT
Thanks much Andrea esp. for the suggestion of SolrCoreAware!


On Thu, Jun 30, 2016 at 10:23 AM, Andrea Gazzarini <> wrote:

> Hi,
> the lifecycle of your Solr extension (i.e. the component) is not something
> that's up to you.
> Before designing the component you should read the framework docs [1], in
> order to understand the context where it will live, once deployed.
> There's nothing, as far as I know, other than the component callbacks
> (e.g. the inform, init methods) that can help you to manage the lifecycle
> of a custom class you're using within the component. Look at the
> SolrCoreAware [2] interface, maybe it could fit your needs.
> From what you write it seems you could need something like a singleton
> (which is often an anti-pattern in distributed environment) , but without
> further details I'm just shooting in the dark
> In addition: you wrote a component so I guess it shouldn't be so hard to
> have a look at one of the existing built-in components. I'm quite sure they
> already met (and solved) a similar issue.
> Best,
> Andrea
> [1]
> [2]
> On 30/06/16 16:00, Mark Robinson wrote:
>> Hi,
>> I have a java OBJECT which I need to load once.
>> I have written a java custom component, which I have added in
>> "last-components" in solrconfig.xml, from which I want to access the above
>> mentioned OBJECT when each search request comes in.
>> Is there a way I can load a java object on server/ instance startup?
>> OR
>> Load it when the first call comes to SOLR?
>> For the time being I created that Java object inside the custom component
>> itself; but it is loaded each time a search request comes in.
>> Could some one pls give some pointers on how my above requirement can be
>> achieved in SOLR?
>> Thanks!
>> Mark

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