Collection Serialization with Kryo

Question

I'm trying to use kryo to serialize and deserialize a java collection.

The serializetion method looks like this:

public <T> byte[] serialize(List<T> objectsToSerialize) {
CollectionSerializer cs = new CollectionSerializer();
Output output = new Output();
cs.write(kryo, output, objectsToSerialize);
return output.toBytes();
}

Now I would like to write the deserialization method but having trouble doing so. Basically the CollectionSerializer has a read method, but I can't understand how to use it (and the documentation is pretty poor as far as I can tell).

Any ideas?

Answer 1

If you are looking to just serialize a Collection to a file then the standard Kryo commands (such as kryo.writeClassAndObject) can handle that very adequately. For example the following program passes a collection of strings to the file "testfile" and back again

public class TestClass{


    public static void main(String[] args) throws FileNotFoundException{
        serialize();
        deSerialize();
    }

    public static void serialize() throws FileNotFoundException{
        Collection<String>collection=new ArrayList<>();

        collection.add("This is a serialized collection of strings");

        Kryo kryo = new Kryo();
        Output output = new Output(new FileOutputStream("testfile"));
        kryo.writeClassAndObject(output, collection);
        output.close();
    }

    public static void deSerialize() throws FileNotFoundException{
        Collection<String>collection;

        Kryo kryo = new Kryo();
        Input input = new Input(new FileInputStream("testfile"));
        collection=(Collection<String>)kryo.readClassAndObject(input);
        input.close();

        for(String string: collection){
            System.out.println(string);
        }

    }


}