You can create an index on a map?

I have a few questions that I can't understand, or find a viable for example. You can create an index for a card, contained in a nested object, and if so, how would you do that? I have currently a filter inspected this criterion in the cache, but I am unable to understand to create an index of usabe for the custom filter. I use coherence 3.5.2 - any help would be most appreciated. I don't know if / what should I do with the SimpleMapIndex...

Here's the Basic object below map. My filter retrieves all objects of ClientType with a client in his collection that contains the past in integer value in the customer's card. So can you create an Index on a card (and a nested to it) and how do you this? The index should be on the nested customerValues hashmap.
class CustomerGroup
{
    Set<Customer> customers ;
}

class Customer
{
    Map<Integer, CustumerValue> customerValues;
}

If you write a custom, ValueExtractor you need to create an index, then you will not have a custom filter.

Depending on how effective it must be custom Extractor you can use POF and don't have to deserialize the entries to create the index, or it can deserialize the class, which will make the code simpler.

For example, without the use of POF

public class MapKeyExtractor extends EntryExtractor implements PortableObject {

    public MapKeyExtractor() {
    }

    @Override
    public Object extractFromEntry(Map.Entry entry) {
        Set keys = new HashSet();
        CustomerGroup group = (CustomerGroup) entry.getValue();
        Set customers = group.getCustomers();
        for (Customer customer : customers) {
            keys.addAll(customer.getCustomerValues().keySet());
        }
        return keys;
    }

    @Override
    public boolean equals(Object obj) {
        return (obj instanceof MapKeyExtractor);
    }

    @Override
    public int hashCode() {
        return MapKeyExtractor.class.hashCode();
    }

    @Override
    public void readExternal(PofReader in) throws IOException {
        super.readExternal(in);
    }

    @Override
    public void writeExternal(PofWriter out) throws IOException {
        super.writeExternal(out);
    }
}

The extractor above returns a collection of all the integer values in the keys to all the customerValues of all customers in a ClientType (I guessed you have some accessor methods on classes that you posted).

You can then use a ContainsFilter for your query. For example to get all values in the cache where the customerValues card contains a 19-key...

Set results = cache.entrySet(new ContainsFilter(new MapKeyExtractor(), 19));

You could write a version of the MapKeyExtractor which uses POF and wouldn't not deserialize values, but it's more complicated code, because should extract the POF of value stream map and go down the keys and values extract the key. It's doable, but not worth it unless you're really worried about the execution of updates of the index.

Discalimer I wrote the code over the top of my head so have not compiled or tested, but it should be OK.

JK

Tags: Fusion Middleware

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