CODEWITHSUNDEEP
hazelcast
user1980831
user1980831

Reputation: 3

hazelcast Configuration for two Jboss instances in same physical machine

I am trying to use hazelcast for caching. We have two applications running on two jboss 7.1 instances in the same physical machines. Both the applications are running in different ports.

Below is my code for starting a server node.

protected void doGet(HttpServletRequest request, HttpServletResponse 
response) throws ServletException, IOException {
     HazelcastInstance hazelcastInstance = Hazelcast.newHazelcastInstance();
     HazelcastInstance hazelcastInstance = CacheHelper.getCacheInstance();
     Map<Long, String> cache = hazelcastInstance.getMap("data");

     Long inputKey = Long.parseLong(request.getParameter("inputKey"));
     String inputMsg = request.getParameter("inputMsg");

     StringBuffer mainStr = null;

     if(null != inputMsg && !(inputMsg.trim().equalsIgnoreCase(""))){
        if(null!=inputKey && inputKey != 0 && cache.containsKey(inputKey)) {
            mainStr = new StringBuffer(cache.get(inputKey));
            mainStr.append(inputMsg);
        } else {
            mainStr = new StringBuffer(inputMsg);
        }

        cache.put(inputKey,mainStr.toString());
    }
}

Every time I am getting a new cache.

Is my understanding correct we just need to create two server nodes. It will automatically discover the other nodes. It doesn't require any kind of XML configuration.

Thanks, Biswa

Upvotes: 0

Views: 705

Answers (1)

Gokhan Oner
Gokhan Oner

Reputation: 3257

Biswa,

     HazelcastInstance hazelcastInstance = Hazelcast.newHazelcastInstance();

This line creates a new Hazelcast instance every time your doGet method called. You need to create Hazelcast instance only once, then use it to access distributed objects. I believe CacheHelper.getCacheInstance() method does that.

For the second question, yes, by default Hazelcast nodes discover other members via multicast, so no config needed.

Please make sure that you have only one Hazelcast.newHazelcastInstance() call in each app & you use that instance to access dist.objects.

Upvotes: 1

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