This is an example exercising the use of Spring Boot and Spring Social Twitter project. It provides an API endpoint that accepts a country code (limited to UK and US for simplicity) and returns the latest twitter trends for that location, along with the top 10 tweets for that twitter trend.

This application was built and tested using:

• Java 1.8.0_181
• Maven 3.5.3
• Docker 18.06.1-ce

Configuration available at:

/src/main/resources/application.properties

To build and start application

./tweetflock.sh start

The application will be available at URL:

http://localhost:8080/api/tweetflock/<Country Code>

e.g.

curl -X GET -H 'Content-Type: application/json' -i 'http://127.0.0.1:8080/api/tweetflock/us'

To stop application

./tweetflock.sh stop

There is available a configuration file where you can setup debug level, cache settings and twitter account secrets.

/src/main/resources/application.properties

All settings are optional despite the following twitter secrets settings:

spring.social.twitter.appId={APPID}
spring.social.twitter.appSecret={APP_SECRET}
twitter.access.token={TOKEN}
twitter.access.token.secret={TOKEN_SECRET}

For optimisation purposes, was added a cache for the api requests, by default is configured to retain cache for 60 minutes More details about how was adopted this solution in next sessions.

spring.cache.caffeine.spec=expireAfterWrite=60m

If you want to build and execute manually instead use provided script you should follow these steps

As a maven project, should be executed:

#!shell
mvn clean package

It will run tests, generate your snapshot version jar and create a new docker image, you can check created image as following

#!shell
$ docker images
REPOSITORY                        TAG                 IMAGE ID            CREATED             SIZE
com.volmar/tweetflock        latest              b59a9ec0130c        18 minutes ago      121MB

The script runs the container with the application as a daemon, if you want run attached to terminal, check debug logs you can run manually

docker run --name=api -p 8080:8080 com.volmar/tweetflock

You should get application available at:

http://localhost:8080/api/tweetflock/<Country Code>

e.g.

curl -X GET -H 'Content-Type: application/json' -i 'http://127.0.0.1:8080/api/tweetflock/us'

The only supported contry codes are US and UK, any other else will return HTTP 400.