question related to the configuration of POF and use-sub-classes

Hello

I noticed that by default POF in coherence.jar (coherence-pof - config.xml) requires the use subclasses true indicator (the ultimate-sub-classes use value is true if any POF loaded configuration file specifies that it is true), and making it impossible to obtain if certain error messages a subclass of a registered type is not listed specifically in the POF-configuration and users can silently losing data in this way.

My question is:

The indicator of use subclasses in coherence-pof-config. XML set to true only because of Throwable-s, or are there other classes provided by coherence that are serialized by a resolution of the subclass and so dependent on the indicator of use subclasses being true?

If only the Throwable-s which depend on, instead of set to true, can we set it to false and use the following instead of ConfigurablePofContext as class the class serializer for POF-enabled services:

import com.tangosol.io.pof.ConfigurablePofContext;
import com.tangosol.run.xml.XmlElement;

/**
 * This class extends ConfigurablePofContext with the possibility to
 * configurably disable the subclass-allowed setting forced true in the
 * coherence-pof-config.xml, and still be able to use ThrowablePofSerializer for
 * each not specifically configured Throwable subclass.
 *
 * @author Robert Varga
 */
public class ThrowableAwareConfigurablePofContext extends
      ConfigurablePofContext {

   /**
    * By setting this flag to true, it is possible to disable subclass
    * resolution. Interface resolution remains untouched.
    */
   private boolean m_fDisableSubclassAllowed;

   /**
    * {@inheritDoc}
    */
   public ThrowableAwareConfigurablePofContext() {
   }

   /**
    * {@inheritDoc}
    *
    * @param sLocator
    */
   public ThrowableAwareConfigurablePofContext(String sLocator) {
      super(sLocator);
   }

   /**
    * {@inheritDoc}
    *
    * @param xml
    */
   public ThrowableAwareConfigurablePofContext(XmlElement xml) {
      super(xml);
   }

   /**
    * Sets the {@link #m_fDisableSubclassAllowed} flag. You can set this as an
    * &lt;init-param&gt; in the Coherence cache configuration file.
    *
    * @param disableSubclassAllowed
    */
   public void setDisableSubclassAllowed(boolean disableSubclassAllowed) {
      this.m_fDisableSubclassAllowed = disableSubclassAllowed;
   }

   /**
    * @return false if disableSubclassAllowed is true, or result from the super
    *         implementation otherwise.
    */
   @Override
   protected boolean isSubclassAllowed() {
      return (!m_fDisableSubclassAllowed) && super.isSubclassAllowed();
   }

   /**
    * If the super implementation could not resolve the type id for the class,
    * and subclass-allowed is disabled and clz is a {@link java.lang.Throwable}
    * subclass then it falls back to the configuration for
    * {@link java.lang.Throwable}.
    */
   @Override
   protected int getInheritedUserTypeIdentifier(Class clz) {
      int result = super.getInheritedUserTypeIdentifier(clz);
      if (result == -1 && !isSubclassAllowed()
            && Throwable.class.isAssignableFrom(clz)) {
         result = getUserTypeIdentifier(Throwable.class);
      }
      return result;
   }
}

Thank you and best regards,

Robert

Hello

Ok. Here goes. Yes, you are right. If you can tolerate interface use being true, the only thing you have to worry is Throwable instance (or subclasses it) in Java and Exception instances (or subclasses it) in .NET.
Please let me know if you have more questions.

Best regards
-Dave

Tags: Fusion Middleware

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