Getting Started With Apache Ignite, Spring Boot and Spring Data Demo

This demo shows how to build a simple RESTful Web Service that uses Apache Ignite as a high-performance in-memory database. The service is powered by Spring Boot that embeds an Apache Tomcat instance and interacts with an Apache Ignite cluster via Spring Data repositories' abstraction.

Developing the Project From Scratch

Follow this tutorial if you want to build the application from the from the ground-up learning all the nuances: https://www.gridgain.com/docs/tutorials/spring/spring_ignite_tutorial

Alternatively, follow instructions from the next section to run the application and play with it.

Run the Application

Checkout the project and start the application executing the following Maven command from the project root folder:

mvn spring-boot:run

Use the curl command-line tool to send several HTTP requests that will be intercepted and processed by your Spring controller. First, get all the cities with a population equal to or bigger than 8 million:

curl http://localhost:9000/api/cities?population=8000000

The response will be as follows:

[{"id":3793,"countryCode":"USA","name":"New York","district":"New York","population":8008278},
{"id":3580,"countryCode":"RUS","name":"Moscow","district":"Moscow (City)","population":8389200},
{"id":2515,"countryCode":"MEX","name":"Ciudad de México","district":"Distrito Federal","population":8591309},
{"id":3357,"countryCode":"TUR","name":"Istanbul","district":"Istanbul","population":8787958},
{"id":2822,"countryCode":"PAK","name":"Karachi","district":"Sindh","population":9269265},
{"id":939,"countryCode":"IDN","name":"Jakarta","district":"Jakarta Raya","population":9604900},
{"id":1890,"countryCode":"CHN","name":"Shanghai","district":"Shanghai","population":9696300},
{"id":206,"countryCode":"BRA","name":"São Paulo","district":"São Paulo","population":9968485},
{"id":2331,"countryCode":"KOR","name":"Seoul","district":"Seoul","population":9981619},
{"id":1024,"countryCode":"IND","name":"Mumbai (Bombay)","district":"Maharashtra","population":10500000}]

Second, get the top 10 most populated cities:

curl http://localhost:9000/api/cities/mostPopulated?limit=10

In response, the application will join City and Country tables to produce the following result:

[["Mumbai (Bombay)",10500000,"India","Federal Republic"],
["Seoul",9981619,"South Korea","Republic"],
["São Paulo",9968485,"Brazil","Federal Republic"],
["Shanghai",9696300,"China","PeoplesRepublic"],
["Jakarta",9604900,"Indonesia","Republic"],
["Karachi",9269265,"Pakistan","Republic"],
["Istanbul",8787958,"Turkey","Republic"],
["Ciudad de México",8591309,"Mexico","Federal Republic"],
["Moscow",8389200,"Russian Federation","Federal Republic"],
["New York",8008278,"United States","Federal Republic"]]

Finally, update a population of the city with id 3507:

curl -X PUT -H 'Content-Type: application/json' -d '{"population":5000}' http://localhost:9000/api/cities/3507

The data will be updated and the controller will send back the modified version of that city’s record:

{"id":3507,"countryCode":"UZB","name":"Buhoro","district":"Buhoro","population":5000}