Hazelcast with Write through Cache using Mapstore

[anku...@gmail.com]

Hi,

I am using Hazelcast as caching Solution for my application.

My application has few inserts and updates to the database and these needs to be synced to Cache also.

 

I want to use MapStore functionality so that when I do IMap.put(), Hazelcast takes care of persisting the Object in underlying Db and also update its cache.

 

In the overridden store implementation, I want to call my DAO in following way to persist the Data.

 

    public void store(Long key, Product value)

        {

            log.info("Storing Data for Employee {} in Database using DataStore ",     value);

        Long employeeId = employeeDao.create(value);

        value.setId(employeeId);

   

    }

 

There are few issues listed below:-

1) In put call, I want to use "key" as the "employeeId", but this is generated only after insertion happens for this record in the Db. So how do I put into the Cache when I don't have the Id.? I want Hazelcast to use the "id" generated as part of store method call (or any other way) as the key to my Object.

 

> Imap.put(key,new Employee(<name of Employee>,<age of employee>))

 

2) The MapStore implementation's store method returns a void so I cannot return the Id generated for this Object to the Client. How can I achieve this?

I tried using MapEntryListeners on the Map but the entry added callback does not return new Object. I also added PostProcessingMapStore interface to my MapStore but could not get the new Value back to client.

 

Please advice

[Enes Akar]

Hi;

You can set the generated id into any attribute of entry using PostProcessingMapStore.

But I do not know a way to set this id as a key.

Not to use mapstore instead inserting manually to db then putting into map with returned id seems feasible to me.

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