Fluo Recipes 1.2.0 documentation  >>  Tools  >>  Serializing Data

Serializing Data

Various Fluo Recipes deal with POJOs and need to serialize them. The serialization mechanism is configurable and defaults to using Kryo.

Custom Serialization

In order to use a custom serialization method, two steps need to be taken. The first step is to implement SimpleSerializer. The second step is to configure Fluo Recipes to use the custom implementation. This needs to be done before initializing Fluo. Below is an example of how to do this.

FluoConfiguration fluoConfig = ...;
//assume MySerializer implements SimpleSerializer
SimpleSerializer.setSetserlializer(fluoConfig, MySerializer.class);
//initialize Fluo using fluoConfig

Kryo Factory

If using the default Kryo serializer implementation, then creating a KryoFactory implementation can lead to smaller serialization size. When Kryo serializes an object graph, it will by default include the fully qualified names of the classes in the serialized data. This can be avoided by registering classes that will be serialized. Registration is done by creating a KryoFactory and then configuring Fluo Recipes to use it. The example below shows how to do this.

For example assume the POJOs named Node and Edge will be serialized and need to be registered with Kryo. This could be done by creating a KryoFactory like the following.

package com.foo;

import com.esotericsoftware.kryo.Kryo;
import com.esotericsoftware.kryo.pool.KryoFactory;

import com.foo.data.Edge;
import com.foo.data.Node;

public class MyKryoFactory implements KryoFactory {
  public Kryo create() {
    Kryo kryo = new Kryo();
    //Explicitly assign each class a unique id here to ensure its stable over
    //time and in different environments with different dependencies.
    kryo.register(Node.class, 9);
    kryo.register(Edge.class, 10);
    //instruct kryo that these are the only classes we expect to be serialized
    return kryo;

Fluo Recipes must be configured to use this factory. The following code shows how to do this.

FluoConfiguration fluoConfig = ...;
KryoSimplerSerializer.setKryoFactory(fluoConfig, MyKryoFactory.class);
//initialize Fluo using fluoConfig
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