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A very fast POJO codec for MongoDB (used in conjunction with the Mongo Java Driver) that handles generic types as well as polymorphic class hierarchies

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package de.bild.codec;

import org.bson.BsonDocumentWrapper;
import org.bson.BsonValue;

/**
 * Introducing this super-interface of {@link IdGenerator} allows for staying backward compatible with existing code.
 * @param  type of the id class
 * @param  type of the entity instance class
 */
public interface InstanceAwareIdGenerator {
    T generate(P instance);

    default BsonValue asBsonValue(T id, TypeCodecRegistry typeCodecRegistry) {
        return BsonDocumentWrapper.asBsonDocument(id, typeCodecRegistry.getRegistry());
    }

}