##This is a demo for STANDARD AppEngine and google pubsub

mvn clean install

You now need to replace YOUR_PROJECT_ID in the following files:

application.properties (appengine.projectId=YOUR_PROJECT_ID)

application-web.xml

======================

The idea, is that an appengine can send and receive messages asynchronously using GCloud pub sub.

This can then be used as a basis for microservices using multiple appengines, each with their own datastore.

To test it out: ensure you have a projectID set up in gcloud. ( To see this, type the following in your terminal )

> gcloud config list

run

> mvn gcloud:deploy

This will push the code remotely to https://.appspot.com

The project uses Swagger as the endpoint so you can open your browser at:

https://yourprojectId.appspot.com/swagger-ui.html

You can create topics and subscriptions with ease, and list them.

Once a subscription is created, then register it via /register/callback on the swagger ui.

Then click the /send/{topic}/{message} GET

So

1. Open the pub-sub-controller (from the above link)

2. POST /topic, and you can make this :

{
  "topicPrefix": “customTopic"
}

Hi try it out (then call GET /topic to see it’s there).

3. open POST /register/callback

with:

{
  "callback": "https://myprojectId.appspot.com/messages/async",
  "subscriberKey": “myFirstSubscriber",
  "topicKey": “customTopic"
}

Hit try it out. This will register the subscriber for the topic = LesTopic, and call the endpoint.

4. Finally

GET /send/{topic}/{message}

where topic = customTopic
message = HappyBirthday

Hit try it out.

The callback /messages/async will receive the message “HappyBirthday” via the pubsub cloud, and you can see this in your appengine logs !

• See LICENSE

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