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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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<td><h1>JiBX: Precompiled Bindings</h1>
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<span class="menu-selection">Precompiled Bindings</span>
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<td>
<div id="bodycol">
<div class="app">
<div class="h3">
<h3><a name="intro"></a>Precompiled bindings</h3>
<p>Prior to version 1.2, the JiBX binding compiler required you to compile all the
bindings being used with a set of classes at one time. This requirement created problems
for enterprise users who need to work with independent extensions to base libraries, as
often occurs when different development groups are involved in extending some shared
code. With version 1.2 there's now a way around the compilation issue, at least in this
case of extensions to base libraries.</p>
<p>Binding extension with separate compiles is implemented in 1.2 as an extension to the
<a href="include-element.html"><include></a> binding element. The new <i>precompiled</i>
attribute lets you to tell the binding compiler that the included binding has already
been compiled. The binding compiler then looks up information from the precompiled
binding and links to the already-generated code rather than regenerating the code for the
included binding, allowing you to use <mapping> definitions defined in the included
binding within the including binding (just as with normal includes).</p>
<p>Call the precompiled binding a "base" binding, and the binding which includes that
base binding an "extension" binding. Using this terminology, you can include a base
binding in multiple, independent, extension bindings. You can also include multiple,
independent, base bindings from a single extension binding. You can even work with
multiple layers of extension, and use different extensions of a single base binding as
the base for further extension. The only restriction is that classes which are bound by
a base binding cannot be bound by any extension binding - the extension bindings can
only work with those classes by refering to the <mapping> definitions present in the
base binding.</p>
</div>
<div class="h3">
<h3><a name="extending"></a>Extending a base binding</h3>
<p>When you extend a precompiled base binding you need to specify a binding definition
for the base binding in the <include> element, just as with a regular <include>.
The binding definition doesn't need to include all the details of the actual binding,
though, since those details have already been used in the code generated by the binding
compiler for the base binding. You <i>do</i> need to have a mapping definition for each
base binding mapping you're going to be using in the extension binding, but you don't
need to include any content for the mapping - the <mapping> element itself is all
that's required. You also need to use the <b>package</b> attribute of the <binding>
element in the included binding to specify the package which contains the generated
binding factory class. You <i>don't</i> need to include any base binding mappings which
you're not using in the extension binding.</p>
<p>When running the binding compiler for an extension binding, the output from the
binding compiler for the base binding (including both the modified bound classes, and
the classes added by the binding compiler) needs to be in the classpath. The binding
compiler will load the base binding information from the classpath, looking for it in
the package specified by the included <binding> element's <b>package</b> attribute,
and verify that the mapping definitions in the included binding are actually present
in the compiled version of that binding.</p>
<p>It's often convenient to package a base binding with the bound class files in a jar.
You can use <b>classpath:</b> URLs in <include> references for access to base bindings
packaged in this way. As an example, if the binding definition was named
<i>base-binding.xml</i> and in the root directory of the jar file you'd reference it as
<code>classpath:base-binding.xml</code> or <code>classpath:/base-binding.xml</code>. If
it was in the <i>META-INF</i> directory of a jar you'd reference it as
<code>classpath:META-INF/base-binding.xml</code> or
<code>classpath:/META-INF/base-binding.xml</code>. Naturally, the jar file containing
the binding definition needs to be in the classpath when this type of reference is used -
but as mentioned above, you need to have the bound class files for the base binding in
the classpath anyway.</p>
</div>
<div class="h3">
<h3><a name="runtime"></a>Runtime usage</h3>
<p>At runtime, you'll need to have the precompiled base binding classes in your
classpath when you create the extension binding factory. As part of loading the
extension binding factory, the JiBX runtime will also load and base bindings and will
check that the version of those base bindings is the same as that used when the
extension binding was compiled. Since the binding compiler links to specific added
methods in the bound classes, it's not possible to substitute a newer version of the
base binding without recompiling the extension binding.</p>
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<td> © 2003-2011, Dennis M. Sosnoski (<a href="http://www.sosnoski.co.nz">Sosnoski Software Associates Ltd</a>).
Licensed to the JiBX Project for free distribution and use. </td>
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