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Posted to users@tapestry.apache.org by Jamie Orchard-Hays <ja...@dang.com> on 2004/10/27 18:39:41 UTC
clearing cache from application extension
I've got an application extension that loads a bunch of properties on
startup. It has listeners that reset items when a message is sent. However,
I need a way to reset the cache in Tapestry once this is done so its cached
resources are cleared. AbstractEngine has clearCachedData(), which should
work, but I don't see a way to access the engine from the extension.
Thanks,
Jamie
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Re: referencing the engine from an extension
Posted by Jamie Orchard-Hays <ja...@dang.com>.
you're right on both counts.
Haven't gotten the answer to the last question yet.
On Oct 27, 2004, at 9:11 PM, Erik Hatcher wrote:
> On Oct 27, 2004, at 5:18 PM, Jamie Orchard-Hays wrote:
>> 1. An extension is defined in the .application file, but where in the
>> code is it attached to the engine?
>
> It is attached to the ApplicationSpecification (via
> LibrarySpecification), not the engine. Extensions are
> application-centric. Engines are not.
>
>> 2. Is there a way to insert a reference to the engine into the
>> extension?
>
> That doesn't really make sense. Engines either come from a pool or
> are attached to a session if one has been started. The lifecycles are
> not the same between extensions and engines.
>
> You're on the wrong path here with your search for why (custom)
> message resources are not being cleared. I'm interested to learn what
> the issue is, though, as I'm the one that created that custom
> implementation :)
>
> Erik
>
>
>>
>> Thanks,
>>
>> Jamie
>> ----- Original Message ----- From: "Bryan Lewis" <br...@maine.rr.com>
>> To: "Tapestry users" <ta...@jakarta.apache.org>
>> Sent: Wednesday, October 27, 2004 2:54 PM
>> Subject: Re: clearing cache from application extension
>>
>>
>>> I had a similar desire. I worked around it by keeping a static list
>>> of all
>>> the engine instances in my custom Engine class.
>>>
>>> private static transient List allEngines;
>>>
>>> protected Object createVisit(IRequestCycle cycle)
>>> {
>>> // Remember this engine in the allEngines list.
>>> if (allEngines == null) {
>>> allEngines = new ArrayList();
>>> }
>>> allEngines.add(this);
>>> }
>>>
>>> public static void clearCaches()
>>> {
>>> if (allEngines == null) return;
>>> for (Iterator it = allEngines.iterator(); it.hasNext(); ) {
>>> Engine engine = (Engine) it.next();
>>> engine.clearCachedData();
>>> }
>>> }
>>>
>>>
>>>
>>>
>>> ----- Original Message ----- From: "Jamie Orchard-Hays"
>>> <ja...@dang.com>
>>> To: "Tapestry users" <ta...@jakarta.apache.org>
>>> Sent: Wednesday, October 27, 2004 12:39 PM
>>> Subject: clearing cache from application extension
>>>
>>>
>>>> I've got an application extension that loads a bunch of properties
>>>> on
>>>> startup. It has listeners that reset items when a message is sent.
>>> However,
>>>> I need a way to reset the cache in Tapestry once this is done so its
>>> cached
>>>> resources are cleared. AbstractEngine has clearCachedData(), which
>>>> should
>>>> work, but I don't see a way to access the engine from the extension.
>>>>
>>>> Thanks,
>>>>
>>>> Jamie
>>>>
>>>>
>>>> --------------------------------------------------------------------
>>>> -
>>>> To unsubscribe, e-mail: tapestry-user-unsubscribe@jakarta.apache.org
>>>> For additional commands, e-mail:
>>>> tapestry-user-help@jakarta.apache.org
>>>>
>>>
>>>
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>>> To unsubscribe, e-mail: tapestry-user-unsubscribe@jakarta.apache.org
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>>> tapestry-user-help@jakarta.apache.org
>>
>>
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>
>
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Re: referencing the engine from an extension
Posted by Erik Hatcher <er...@ehatchersolutions.com>.
On Oct 27, 2004, at 5:18 PM, Jamie Orchard-Hays wrote:
> 1. An extension is defined in the .application file, but where in the
> code is it attached to the engine?
It is attached to the ApplicationSpecification (via
LibrarySpecification), not the engine. Extensions are
application-centric. Engines are not.
> 2. Is there a way to insert a reference to the engine into the
> extension?
That doesn't really make sense. Engines either come from a pool or are
attached to a session if one has been started. The lifecycles are not
the same between extensions and engines.
You're on the wrong path here with your search for why (custom) message
resources are not being cleared. I'm interested to learn what the
issue is, though, as I'm the one that created that custom
implementation :)
Erik
>
> Thanks,
>
> Jamie
> ----- Original Message ----- From: "Bryan Lewis" <br...@maine.rr.com>
> To: "Tapestry users" <ta...@jakarta.apache.org>
> Sent: Wednesday, October 27, 2004 2:54 PM
> Subject: Re: clearing cache from application extension
>
>
>> I had a similar desire. I worked around it by keeping a static list
>> of all
>> the engine instances in my custom Engine class.
>>
>> private static transient List allEngines;
>>
>> protected Object createVisit(IRequestCycle cycle)
>> {
>> // Remember this engine in the allEngines list.
>> if (allEngines == null) {
>> allEngines = new ArrayList();
>> }
>> allEngines.add(this);
>> }
>>
>> public static void clearCaches()
>> {
>> if (allEngines == null) return;
>> for (Iterator it = allEngines.iterator(); it.hasNext(); ) {
>> Engine engine = (Engine) it.next();
>> engine.clearCachedData();
>> }
>> }
>>
>>
>>
>>
>> ----- Original Message ----- From: "Jamie Orchard-Hays"
>> <ja...@dang.com>
>> To: "Tapestry users" <ta...@jakarta.apache.org>
>> Sent: Wednesday, October 27, 2004 12:39 PM
>> Subject: clearing cache from application extension
>>
>>
>>> I've got an application extension that loads a bunch of properties on
>>> startup. It has listeners that reset items when a message is sent.
>> However,
>>> I need a way to reset the cache in Tapestry once this is done so its
>> cached
>>> resources are cleared. AbstractEngine has clearCachedData(), which
>>> should
>>> work, but I don't see a way to access the engine from the extension.
>>>
>>> Thanks,
>>>
>>> Jamie
>>>
>>>
>>> ---------------------------------------------------------------------
>>> To unsubscribe, e-mail: tapestry-user-unsubscribe@jakarta.apache.org
>>> For additional commands, e-mail:
>>> tapestry-user-help@jakarta.apache.org
>>>
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: tapestry-user-unsubscribe@jakarta.apache.org
>> For additional commands, e-mail: tapestry-user-help@jakarta.apache.org
>
>
> ---------------------------------------------------------------------
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referencing the engine from an extension
Posted by Jamie Orchard-Hays <ja...@dang.com>.
Let me ask my question in a different way:
1. An extension is defined in the .application file, but where in the code
is it attached to the engine?
2. Is there a way to insert a reference to the engine into the extension?
Thanks,
Jamie
----- Original Message -----
From: "Bryan Lewis" <br...@maine.rr.com>
To: "Tapestry users" <ta...@jakarta.apache.org>
Sent: Wednesday, October 27, 2004 2:54 PM
Subject: Re: clearing cache from application extension
>I had a similar desire. I worked around it by keeping a static list of all
> the engine instances in my custom Engine class.
>
> private static transient List allEngines;
>
> protected Object createVisit(IRequestCycle cycle)
> {
> // Remember this engine in the allEngines list.
> if (allEngines == null) {
> allEngines = new ArrayList();
> }
> allEngines.add(this);
> }
>
> public static void clearCaches()
> {
> if (allEngines == null) return;
> for (Iterator it = allEngines.iterator(); it.hasNext(); ) {
> Engine engine = (Engine) it.next();
> engine.clearCachedData();
> }
> }
>
>
>
>
> ----- Original Message -----
> From: "Jamie Orchard-Hays" <ja...@dang.com>
> To: "Tapestry users" <ta...@jakarta.apache.org>
> Sent: Wednesday, October 27, 2004 12:39 PM
> Subject: clearing cache from application extension
>
>
>> I've got an application extension that loads a bunch of properties on
>> startup. It has listeners that reset items when a message is sent.
> However,
>> I need a way to reset the cache in Tapestry once this is done so its
> cached
>> resources are cleared. AbstractEngine has clearCachedData(), which should
>> work, but I don't see a way to access the engine from the extension.
>>
>> Thanks,
>>
>> Jamie
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: tapestry-user-unsubscribe@jakarta.apache.org
>> For additional commands, e-mail: tapestry-user-help@jakarta.apache.org
>>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: tapestry-user-unsubscribe@jakarta.apache.org
> For additional commands, e-mail: tapestry-user-help@jakarta.apache.org
>
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Re: clearing cache from application extension
Posted by Bryan Lewis <br...@maine.rr.com>.
I had a similar desire. I worked around it by keeping a static list of all
the engine instances in my custom Engine class.
private static transient List allEngines;
protected Object createVisit(IRequestCycle cycle)
{
// Remember this engine in the allEngines list.
if (allEngines == null) {
allEngines = new ArrayList();
}
allEngines.add(this);
}
public static void clearCaches()
{
if (allEngines == null) return;
for (Iterator it = allEngines.iterator(); it.hasNext(); ) {
Engine engine = (Engine) it.next();
engine.clearCachedData();
}
}
----- Original Message -----
From: "Jamie Orchard-Hays" <ja...@dang.com>
To: "Tapestry users" <ta...@jakarta.apache.org>
Sent: Wednesday, October 27, 2004 12:39 PM
Subject: clearing cache from application extension
> I've got an application extension that loads a bunch of properties on
> startup. It has listeners that reset items when a message is sent.
However,
> I need a way to reset the cache in Tapestry once this is done so its
cached
> resources are cleared. AbstractEngine has clearCachedData(), which should
> work, but I don't see a way to access the engine from the extension.
>
> Thanks,
>
> Jamie
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: tapestry-user-unsubscribe@jakarta.apache.org
> For additional commands, e-mail: tapestry-user-help@jakarta.apache.org
>
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