Communication methods between two GAE services in the same project

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On Google App Engine, when a project has more than one service and these services in the same project need to communicate to one another, is there any way to send a message to another service for calling function apart from using URLFetch api?

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Dan Cornilescu On

One option is to use Task Queues.

The queue definitions are an app-level configuration applicable to all services/modules. So tasks can be enqueued into any queue by any service/module and each queue can be targeted to (serviced by) a specific service/module.