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Sling Servlet Context Listener

Forum|Forum|3 years ago
December 16, 2022
1 reply
1716 views

Hi All,

We are trying to implement the functionality similar to provided by javax.servlet.ServletContextListener.

We need to instantiate the object at the moment of context initialization and then access it from servlets

Could somebody help to understand what is the proper way to do that with Sling Servlets?

Thanks,

Pavel

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Best answer by arunpatidar

Hi,

I have never used javax.servlet.ServletContextListener approach, so I can't really suggest around that.

But I have used the static osgi service where I set the value and used it later.

arunpatidar

Community Advisor

Hi,

Can you explain the use case here, so we can check It can also be implemented other way or sling/osgi/jcr provide anything to fulfill your use case?

Arun Patidar

P

pilmenkovAuthor

The usecase is very general: we need to implement a kind of singleton - an object that collects the information generated during servlet execution and allows to retrieve this information from another servlet.

We have custom library supporting this functionality in web container environment, so trying to reuse as much as possible for Sling/AEM deployment scenario.

The question appears because of uncertainity of the way of servlet context accessing in order to initialize the "singleton", similar to javax.servlet.ServletContextListener approach.

arunpatidar

Accepted solution

Community Advisor

Hi,

I have never used javax.servlet.ServletContextListener approach, so I can't really suggest around that.

But I have used the static osgi service where I set the value and used it later.

Arun Patidar

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