A generic object interface that is returned to user when the domain class can not be created from any of the distributed
hazelcast data structures like
IMap ,
IQueue etc.
On remote calls like distributed executor service or EntryProcessors, you may need to access to the domain object. In
case class of the domain object is not available on the cluster, GenericRecord allows to access, read and write the objects
back without the class of the domain object on the classpath. Here is an read example with EntryProcessor:
map.executeOnKey(key, (EntryProcessor) entry -> {
Object value = entry.getValue();
GenericRecord genericRecord = (GenericRecord) value;
int id = genericRecord.readInt("id");
return null;
});
Another example with EntryProcessor to demonstrate how to read, modify and set back to the map:
map.executeOnKey("key", (EntryProcessor) entry -> {
GenericRecord genericRecord = (GenericRecord) entry.getValue();
GenericRecord modifiedGenericRecord = genericRecord.cloneWithBuilder()
.writeInt("age",22).build();
entry.setValue(modifiedGenericRecord);
return null;
});
GenericRecord also allows to read from a cluster without having the classes on the client side.
For Portable, when PortableFactory is not provided in the config at the start,
a HazelcastSerializationException was thrown stating that a factory could not be found. Starting from 4.1,
the objects will be returned as GenericRecord. This way, the clients can be read and write the objects back to
the cluster without needing the classes of the domain objects on the classpath.
Currently this is valid for Portable objects.