@Override
  public Object getCallbackArgument() {
    Object result = callbackArgument;
    if (result == Token.NOT_AVAILABLE) {
      result = AbstractRegion.handleNotAvailable(result);
    } else if (result instanceof WrappedCallbackArgument) {
      WrappedCallbackArgument wca = (WrappedCallbackArgument) result;
      result = wca.getOriginalCallbackArg();
    }
    return result;
    // return AbstractRegion.handleNotAvailable(this.callbackArgument);
  }
Returns the key.

@return the key
geode-core/src/main/java/org/apache/geode/internal/cache/EntryOperationImpl.java