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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">I went through <tt>Enhancer</tt> and I think it should not be overly difficult to make this part of the <tt>BytecodeProvider</tt> SPI as in <tt>BytecodeProvider#getEnhancer</tt>. Furthermore I believe it should be pretty straightforward (though probably a lot of work) to create a Byte Buddy-backed <tt>Enhancer</tt> impl. Of course the devil is in the details, but it looks like the actual runtime code for enhancement is pretty well isolated from Javassist.</p> <p style="margin: 10px 0 0">One thing we'd have to work out is that as-is <tt>Enhancer</tt> is kind of open-ended. We simply ask the <tt>Enhancer</tt> to enhance this class or that class. It is up to the <tt>Enhancer</tt> itself to decide on what type(s) of enhancement to do as well as how to perform that enhancement. I wonder if instead we should design this such that we have another contract into the enhancement process that comes from the <tt>BytecodeProvider</tt>. <tt>Enhancer</tt> would then act as the coordinator, calling out to that <tt>BytecodeProvider</tt> delegate as needed. For the sake of illustrating, let's call this delegate <tt>EnhancementCapabilities</tt>. The idea would be that there are certain capabilities we need to know how to enhance into the class; e.g. if we are adding lazy loading capabilities we need the ability to:</p>
<ol>
<li>add a field to hold the <tt>LazyPropertyInitializer</tt></li>
<li>add a "getter" to be able to inject the <tt>LazyPropertyInitializer</tt></li>
<li>add a "setter" to be able to access the associated <tt>LazyPropertyInitializer</tt></li>
<li>mutate any getter and setter calls for persistent "state fields" to use the <tt>LazyPropertyInitializer</tt></li>
</ol> <p style="margin: 10px 0 0">Each of those would be a "capability" exposed by <tt>EnhancementCapabilities</tt>. E.g.:</p>
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">interface</span> EnhancementCapabilities {
SomeFieldPointer addLazyPropertyInitializerField();
SomeMethodPointer addLazyPropertyInitializerGetter();
SomeMethodPointer addLazyPropertyInitializerSetter();
void mutatePersistentStateFieldAcess(SomeFieldPointer lazyPropertyInitializerField, ... )
...
}
</pre>
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</div> <p style="margin: 10px 0 0">That is pretty straight-forward in terms of implementing that in Javassist. As I understand it though, Byte Buddy works on top of ASM and so I wonder if this approach is reasonably doable in a ByteBuddyBytecodeProvider. Again the idea is to isolate just the differences between using Javassist and Byte Buddy for enhancement; the actual coordination of enhancement would <b>ideally</b> be common.</p> </td>
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