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javasortinghazelcast

Sort the Hazelcast json value in java

I'm storing the Hazelcast JSON value in IMAP

IMap.put(Integer,new HazelcastjsonValue("{"id":"001","name":"vikram"}"));
IMap.put(Integer,new HazelcastjsonValue("{"id":"002","name":"abhishek"}"));

How to sort the HazelcastjsonValue by name

I know using paging predicate we can achieve a sorted JSON array.

But how to use the paging predicate for the HazelcastjsonValue.

Can anyone please help me with this?

Solution

  • You can set an index as described in Hazelcast Reference Manual: Indexing Queries. In your case, it would look like:

    IMap.addIndex(new IndexConfig(IndexType.SORTED, "name"));

    Then, the result collection should be sorted.

    If you don't want to set an index, then I guess you can use Predicates.pagingPredicate(comparator, size), but you would need write your own custom comparator.