Google Cloud Endpoint initialization

[Mike D]

I have some initialization stuff that I'd like to do before GCE can be used.  How would I do this?  I tried creating a ServletContextListener and then calling a static method on my GCE but that doesn't work.  In debugging I can see that the GCEs static variables are not set when a method is invoked.

[Vinny P]

On Wed, Apr 16, 2014 at 8:37 PM, Mike D <mdichi...@fittrace.com> wrote:

I have some initialization stuff that I'd like to do before GCE can be used.  How would I do this?  I tried creating a ServletContextListener and then calling a static method on my GCE but that doesn't work.  In debugging I can see that the GCEs static variables are not set when a method is invoked.

Endpoints applications are slightly different than normal web applications; as you remarked in your post, static variables don't retain their values. 

If you need to do initialization, you should handle init separately (perhaps as part of a cron job) and save the results into the datastore/cloud storage/cloud SQL.

 

 

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-Vinny P

Technology & Media Advisor

Chicago, IL

App Engine Code Samples: http://www.learntogoogleit.com

[Gilberto Torrezan Filho]

Let me see if I understood correctly: are you saying a instance of my entire VM are launched every time a request is handled by the GCE engine? All my singleton classes (DAOs, default values, some utilities) are reinstantiated each request?

I don't save sensitive state in memory (I use Memcache/Datastore for that), but some objects cloud be reused among requests, the way it works on regular GAE frontend requests.

[Vinny P]

No. Instances don't get reloaded per request with Endpoints. That would be a terrible waste of resources.

Sorry, I probably should have clarified/explained more in my previous email, but I was in a bit of a rush when I wrote that. Endpoints doesn't support static methods ( see this article, scroll down to the API Methods header ) unless they're marked as private. When OP tried to run his static method, it may not have run or failed off.

In addition, I cheated a little bit on the answer and noted that the OP cross-posted his question to SO, where he said that he needed data tables precomputed during init. That's something that really needs to be moved to a regular cron or similar. 

@OP/Mike: Can you post a simple test case?

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