Getting started with Hazelcast using Grails in 10 minutes

26 / Oct / 2015 by Jeevesh Pandey 0 comments

In computing, Hazelcast is an open source in-memory data grid based on Java. This blog will help you to tune the performance of your Grails application using Hazelcast.

Integrating Hazelcast with Grails

Step 1: Setup Hazelcast server using server.sh (Packaged within Hazelcast zipped bundle):

  • Download the Hazelcast .zip from this link http://hazelcast.org/download/
  • Execute server.sh from hazelcast-<version>/bin
  • This will start Hazelcast cluster.

You will see something like this when you execute server.sh.

hazelcast

Voila !! this is your first Hazelcast cluster.

Step 2:  Setting up Hazelcast client:

  • Add dependency in your BuildConfig.groovy:

compile("com.hazelcast:hazelcast-client:3.5.2")

  • Create a HazelcastClient.groovy file in your Grails application’s ~/src/groovy:

class HazelcastClient {

private static HazelcastInstance _client

public static HazelcastInstance getClient() {
if (!(_client != null && _client.getLifecycleService().isRunning()))
{
ClientConfig clientConfig = new ClientConfig()
clientConfig.getNetworkConfig().addAddress(HAZELCAST SERVER URL)
_client = com.hazelcast.client.HazelcastClient.newHazelcastClient(clientConfig)
}
return _client
}
}

This getClient() method will create a Hazelcast client and connects to Hazelcast server in HAZELCAST SERVER URL

Step 3:  Populating data in Hazelcast:

IMap<Integer, String> map=getClient().getMap(<YOUR MAP NAME>)
map.put(1,"BOB")
map.put(2,"ROY")

Step 4:  Fetching data from Hazelcast :

IMap<Integer, String> map=getClient().getMap(<YOUR MAP NAME>)
map.get(1) // "BOB"

Hope this will help!!

Also, there’s a lot about Grails 3.0 going the rounds in the Grails community, here’s a compilation of latest TOP 8 updates on Grails 3.0 –

Grails 3.0

For more reference: visit https://hazelcast.com/

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