Play's approach to Rapid Application Development in Java/Scala is good, however not great :-) Great will be to take it forward to Rapid Application Deployment in cloud and in real life environments - Dev, Integration, QA, Prod, ...

1. Jan-2015

2.  Why Play is great for RAD
 A pattern for rapid deployment via Play &
AWS
 Seamless Remote testing via Play

3.  Hot code reloading
 Swagger plugin
 Junit built-in

4.  Great for most environments
◦ Dev, Integration, QA
 Very nice for production
◦ Just a bit slower to launch
◦ Less secure
◦ But, can be optimized to both

5.  The Concept
◦ “Stateless” machine image
 No code, no credentials, no data.
◦ “Dependency Injection” of the environment parameters
◦ Init script
◦ Run app
 Ideal for AWS - Play! - Git
◦ AMI
◦ User Data
◦ Download code
◦ Play!

6. {
"gitUrl":" https://xxx.softimize:xxx@git.assembla.com/xxx.git ",
"gitBranch":"master",
"gitTag":"V_1.0",
"keepExistingSources":"true",
"projectDir":“xxx-cloud-service“, "projectName":“xxxService",
"playCommand": "start -Dhttp.port=80"
}
Possible on Auto Scaling as well!

7. USER_DATA=`wget -qO- http://169.254.169.254/latest/user-data`
GIT_BRANCH=`echo "$USER_DATA" | jq '.gitBranch' | sed -e 's/^"//' -e 's/"$//'`
git remote add -t $GIT_BRANCH -f origin $GIT_URL
 Any branch/tag
◦ Dev, INT, QA, Prod
 Production robustness
◦ Not depending on repo availability
 Upgrade/Downgrade?
◦ Just change the user data and reboot

8. {
"adminPass":"password",
"environmentName":"Test",
"dbProperties":{
"shouldWorkWithInstanceRole" :"true"
"accessKey":"LocalDB",
"secretKey":"LocalDB",
"rlRegion":"us-east-1",
"maxRetries":4,
"failureMaxIntervalInMillis":5000,
}
}
 Per-environment instance permissions
 Per-environment dependent resources (DB, storage, etc..)

9. import play.test.Helpers;
public class TestHelper extends Helpers {
public void testMethod() {
Result result =
callAction(xxx.routes.ref.XxxController.yyyMethod(),
fakeRequest().WithWhatever());
assertThat(status(result)).isEqualTo(OK);
 Great for local integration/behavior testing, but
 What about real clients, not running on the same machine
as the server?
◦ Different time zones, clocks
◦ Different locales and string formats

10. import play.test.Helpers;
public class TestHelper extends Helpers {
public void testMethod() {
Result result =
callApiAction(xxx.routes.ref.XxxController.yyyMethod(),
fakeRequest().WithWhatever(), relativeURL, reqParams);
assertThat(status(result)).isEqualTo(OK);

11. Play test –DTestServer.RemoteAddress=http://<host>:<port>/baseURL
import play.libs.WS.WSRequestHolder;
public Result callApiAction(HandlerRef ref, FakeRequest
request,String parameters,String methodName) {
if (!shouldTestRemote) return callAction(ref,request);
long timeoutAllowed=20000;
String contentType="application/x-www-form-urlencoded";
Response response=new
WSRequestHolder(serverUrl+methodName).setContentType(contentType
).post(parameters).get(timeoutAllowed);
return play.mvc.Results.status(response.getStatus(),
response.asByteArray());
}

12. “The R&D team you wish to have”
 Senior developers
 Junior developers
 Students
Guy Vinograd
guy@softimize.co.il

13. Guy Vinograd
guy@softimize.co.il