I see. If I wanted to try the second option ("find a place inside solr before
the core is created") then where would that place be in the flow of app waking
up? Currently what I am doing is each core loads its app caches via a
requesthandler (in solrconfig.xml) that initializes the java class that does
the loading. For instance:
<requestHandler name="/cachedResources" class="solr.SearchHandler"
startup="lazy" >
<arr name="last-components">
<str>AppCaches</str>
</arr>
</requestHandler>
<searchComponent name="AppCaches" class="com.name.Project.AppCaches"/>
So each core has its own so specific cachedResources handler. Where in SOLR
would I need to place the AppCaches code to make it visible to all other cores
then?
thank you Roman
On Jun 29, 2013, at 10:58 AM, Roman Chyla <[email protected]> wrote:
> Cores can be reloaded, they are inside solrcore loader /I forgot the exact
> name/, and they will have different classloaders /that's servlet thing/, so
> if you want singletons you must load them outside of the core, using a
> parent classloader - in case of jetty, this means writing your own jetty
> initialization or config to force shared class loaders. or find a place
> inside the solr, before the core is created. Google for montysolr to see
> the example of the first approach.
>
> But, unless you really have no other choice, using singletons is IMHO a bad
> idea in this case
>
> Roman
>
> On 29 Jun 2013 10:18, "Peyman Faratin" <[email protected]> wrote:
>>
>> its the singleton pattern, where in my case i want an object (which is
> RAM expensive) to be a centralized coordinator of application logic.
>>
>> thank you
>>
>> On Jun 29, 2013, at 1:16 AM, Shalin Shekhar Mangar <[email protected]>
> wrote:
>>
>>> There is very little shared between multiple cores (instanceDir paths,
>>> logging config maybe?). Why are you trying to do this?
>>>
>>> On Sat, Jun 29, 2013 at 1:14 AM, Peyman Faratin <[email protected]>
> wrote:
>>>> Hi
>>>>
>>>> I have a multicore setup (in 4.3.0). Is it possible for one core to
> share an instance of its class with other cores at run time? i.e.
>>>>
>>>> At run time core 1 makes an instance of object O_i
>>>>
>>>> core 1 --> object O_i
>>>> core 2
>>>> ---
>>>> core n
>>>>
>>>> then can core K access O_i? I know they can share properties but is it
> possible to share objects?
>>>>
>>>> thank you
>>>>
>>>
>>>
>>>
>>> --
>>> Regards,
>>> Shalin Shekhar Mangar.
>>
