Lazy JSON Serialization

LazyJSONSerialization.java

@Component
public class LazyJSONSerialization extends XStreamJSONSerialization {
  private SerializerHolder holder;
  public LazyJSONSerialization(SerializerHolder holder, HttpServletResponse response, TypeNameExtractor extractor, ProxyInitializer initializer, XStreamBuilder builder) {
    super(response, extractor, initializer, builder);
    this.holder = holder;
  }
  @Override
  protected SerializerBuilder getSerializer() {
      try {
        return new XStreamSerializer(getXStream(), holder.createWriter(), extractor, initializer);
      } catch (IOException e) {
          throw new ResultException("Unable to serialize data", e);
      }
  }
}

LazySerializerInterceptor.java

@Intercepts(before=HibernateTransactionInterceptor.class)
public class LazySerializerInterceptor implements Interceptor {
  public LazySerializerInterceptor(SerializerHolder holder, HttpServletResponse response) {
    this.holder = holder;
    this.response = response;
  }
  
  public boolean accepts(ResourceMethod method) { return true; }
  
  public void intercept(InterceptorStack stack, ResourceMethod method, Object instance) {
    stack.next(method, instance);
    if (holder.getWriter() != null) {
      response.getWriter().print(holder.getWriter());
    }
  }
}

SerializerHolder.java

@Component
public class SerializerHolder {
  private StringWriter writer;
  
  public Writer createWriter() {
    this.writer = new StringWriter();
    return this.writer;
  }
  
  public Writer getWriter() {
    return this.writer;
  }
}