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<td style="vertical-align: top;; padding: 0; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://hibernate.atlassian.net/browse/HHH-11152" style="color: #3b73af; text-decoration: none">Re: ByteBuddy BytecodeProvider </a> </span> </td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0; border-collapse: collapse; padding: 0 0 10px"> <p style="margin: 10px 0 0; margin-top: 0"><a href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=raphw" class="user-hover" rel="raphw" style="color: #3b73af; text-decoration: none">Rafael Winterhalter</a> The only changes I'd really expect to be needed are:</p>
<ol>
<li>Make <tt>Enhancer</tt> an interface, rather than just the single impl we have today</li>
<li>Expose the <tt>Enhancer</tt> from <tt>BytecodeProvider</tt></li>
<li>Adjust <tt>EnhancementContext</tt> to not use Javassist types are its interchange.</li>
</ol> <p style="margin: 10px 0 0">The last one is the only real biggie. I knew it was less that ideal when we originally wrote this work, as you can even see in the todo comment:</p>
<blockquote style="margin: 10px 0 0; border-left: 1px solid #cccccc; color: #707070; margin-left: 19px; padding: 10px 20px">
<ul>
<li>@todo Not sure its a great idea to expose Javassist classes this way. maybe wrap them in our own contracts?</li>
</ul>
</blockquote> <p style="margin: 10px 0 0">which is in fact exactly what we will have to do. We will have to develop an SPI contract for communication between Hibernate (as the <tt>Enhancer</tt> consumer and <tt>EnhancementContext</tt> implementor) and the <tt>Enhancer</tt> implementor(s).</p> <p style="margin: 10px 0 0">We can certainly help with all these tasks listed here. I'm not sure how much help we can give though implementing a Byte Buddy implementation of <tt>Enhancer</tt>. I personally have no knowledge of Byte Buddy.</p> <p style="margin: 10px 0 0">As far as a "formal specification" its really all defined by the <tt>EnhancementContext</tt> methods. Specifically the following capabilities are expected:</p>
<ol>
<li>enhance entity, embeddable and mappedsuperclass classes to implement the appropriate version of <tt>org.hibernate.engine.spi.Managed</tt></li>
<li>enhance for lazy loading support
<ol>
<li><tt>org.hibernate.bytecode.enhance.spi.EnhancementContext#hasLazyLoadableAttributes</tt></li>
<li><tt>org.hibernate.bytecode.enhance.spi.EnhancementContext#isPersistentField</tt></li>
<li><tt>org.hibernate.bytecode.enhance.spi.EnhancementContext#isLazyLoadable</tt></li>
<li><tt>org.hibernate.bytecode.enhance.spi.EnhancementContext#isMappedCollection</tt></li>
</ol> </li>
<li>enhance for bi-directional association management
<ol>
<li><tt>org.hibernate.bytecode.enhance.spi.EnhancementContext#doBiDirectionalAssociationManagement</tt></li>
</ol> </li>
<li>enhance for in-line dirty checking/tracking
<ol>
<li><tt>org.hibernate.bytecode.enhance.spi.EnhancementContext#doDirtyCheckingInline</tt></li>
</ol> </li>
<li>attempt to perform "extended" enhancement (convert field access outside the class itself)
<ol>
<li><tt>org.hibernate.bytecode.enhance.spi.EnhancementContext#doExtendedEnhancement</tt></li>
</ol> </li>
</ol> <p style="margin: 10px 0 0">Honestly, some of this we may want to just move into the <tt>Enhancer</tt> implementor. That would alleviate much of the need for dedicated SPI contract describing the domain model to be enhanced. </p> </td>
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