CODEWITHSUNDEEP
javaserializationehcache
Rafael Winterhalter
Rafael Winterhalter

Reputation: 44042

Custom serialization with Ehcache

Is it possible to tell Ehcache to use a custom serialization when moving an object from the memory to the disc or off-heap cache and the other way? I want to skip some fields from serialization which are not declared transient (third-party-library) but which I do not need to store since I can easily recalculate them. I want to do this to save quite some memory. At best, I want to use a library like Kryo.

Upvotes: 1

Views: 3632

Answers (1)

Rafael Winterhalter
Rafael Winterhalter

Reputation: 44042

I found a solution by using wrappers and by adding another abstraction layer, a SerializationWrapper. The wrapper presented here uses Kryo:

final class SerializationWrapper implements Serializable {

  private final static Kryo KRYO = new Kryo();
  private Object object;

  public SerializationWrapper(Object object) {
    this.object = object;
  }

  private void readObject(ObjectInputStream objectInputStream) 
      throws IOException, ClassNotFoundException {
    Input input = new Input(objectInputStream);
    object = KRYO.readClassAndObject(input);
    input.close();
  }

  private void writeObject(ObjectOutputStream objectOutputStream) 
      throws IOException {
    Output output = new Output(objectOutputStream);
    KRYO.writeClassAndObject(output, object);
    output.close();
  }

  public Object getWrappedObject() {
    return object;
  }
}

The serialization methods readObject and writeObjectwill be called by the Java contract and allow me to implement a custom serialization. Additionally, This solution does not create a size overhead since I only write the wrapped object to the output stream and skip the writing of the wrapper entirely. You can also read this documentation for more info what helped me a lot.

Upvotes: 3

Related Questions