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6.3. Using an Advanced Externalizer

Using a customized advanced externalizer helps optimize performance in Red Hat JBoss Data Grid.
  1. Define and implement the readObject() and writeObject() methods.
  2. Link externalizers with marshaller classes.
  3. Register the advanced externalizer.
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6.3.1. Implement the Methods
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To use advanced externalizers, define and implement the readObject() and writeObject() methods. The following is a sample definition: 
import org.infinispan.commons.marshall.AdvancedExternalizer;
 
public class Person {
 
   final String name;
   final int age;
 
   public Person(String name, int age) {
      this.name = name;
      this.age = age;
   }
 
   public static class PersonExternalizer implements AdvancedExternalizer<Person> {
      @Override
      public void writeObject(ObjectOutput output, Person person)
            throws IOException {
         output.writeObject(person.name);
         output.writeInt(person.age);
      }
 
      @Override
      public Person readObject(ObjectInput input)
            throws IOException, ClassNotFoundException {
         return new Person((String) input.readObject(), input.readInt());
      }
 
      @Override
      public Set<Class<? extends Person>> getTypeClasses() {
         return Util.<Class<? extends Person>>asSet(Person.class);
      }
 
      @Override
      public Integer getId() {
         return 2345;
      }
   }
}
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Note

This method does not require annotated user classes. As a result, this method is valid for classes where the source code is not available or cannot be modified.
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