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<p>ActiveJ Specializer is an innovative technology for improving class runtime performance for the JVM. It is one of the ActiveJ technologies that has no third-party dependencies, so it can be used as a stand-alone component.</p>
<h2 class="anchor anchorWithStickyNavbar_LWe7" id="how-it-works">How it works?<a href="#how-it-works" class="hash-link" aria-label="Direct link to How it works?" title="Direct link to How it works?">​</a></h2>
<p>ActiveJ Specializer uses ASM library to automatically convert class instances into specialized static classes, and class instance fields into baked-in static fields. This enables a wide variety of JVM optimizations for static classes that are not possible otherwise: dead code elimination, aggressively inlining methods, and static constants. According to our measures, in some cases speedups can reach <strong>30%-50%</strong>.</p>
<h2 class="anchor anchorWithStickyNavbar_LWe7" id="why-activej-specializer">Why ActiveJ Specializer?<a href="#why-activej-specializer" class="hash-link" aria-label="Direct link to Why ActiveJ Specializer?" title="Direct link to Why ActiveJ Specializer?">​</a></h2>
<p>This simple example illustrates the core ActiveJ Specializer concept. Suppose there is an <code>INT_UNARY_OPERATOR</code> that can be simplified. <code>INT_UNARY_OPERATOR_SPECIALIZED</code> specializes the equation similarly to the <code>INT_UNARY_OPERATOR_SPECIALIZED_MANUALLY</code>, but does so automagically.</p>
<p>According to the benchmarks the original equation was processed in 69.938 ns, while manual and automatic specialized took only 26.533 ns and 26.691 ns, respectively.</p>
<div class="language-java codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-java codeBlock_bY9V thin-scrollbar" style="color:#F8F8F2;background-color:#282A36"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">static</span><span class="token plain"> </span><span class="token class-name">IntUnaryOperator</span><span class="token plain"> </span><span class="token constant" style="color:rgb(189, 147, 249)">INT_UNARY_OPERATOR</span><span class="token plain"> </span><span class="token operator">=</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">    </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">new</span><span class="token plain"> </span><span class="token class-name">IntUnaryOperatorProduct</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">        </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">new</span><span class="token plain"> </span><span class="token class-name">IntUnaryOperatorSum</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">            </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">new</span><span class="token plain"> </span><span class="token class-name">IntUnaryOperatorSum</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">                 </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">new</span><span class="token plain"> </span><span class="token class-name">IntUnaryOperatorIdentity</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">                 </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">new</span><span class="token plain"> </span><span class="token class-name">IntUnaryOperatorConst</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token number">5</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">            </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">new</span><span class="token plain"> </span><span class="token class-name">IntUnaryOperatorConst</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token operator">-</span><span class="token number">5</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">         </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">new</span><span class="token plain"> </span><span class="token class-name">IntUnaryOperatorConst</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token operator">-</span><span class="token number">1</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token punctuation" style="color:rgb(248, 248, 242)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">static</span><span class="token plain"> </span><span class="token class-name">IntUnaryOperator</span><span class="token plain"> </span><span class="token constant" style="color:rgb(189, 147, 249)">INT_UNARY_OPERATOR_SPECIALIZED_MANUALLY</span><span class="token plain"> </span><span class="token operator">=</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">    </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">new</span><span class="token plain"> </span><span class="token class-name">IntUnaryOperator</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">        </span><span class="token annotation punctuation" style="color:rgb(248, 248, 242)">@Override</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">        </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">public</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">int</span><span class="token plain"> </span><span class="token function" style="color:rgb(80, 250, 123)">applyAsInt</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">int</span><span class="token plain"> x</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">            </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">return</span><span class="token plain"> </span><span class="token operator">-</span><span class="token plain">x</span><span class="token punctuation" style="color:rgb(248, 248, 242)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">        </span><span class="token punctuation" style="color:rgb(248, 248, 242)">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">    </span><span class="token punctuation" style="color:rgb(248, 248, 242)">}</span><span class="token punctuation" style="color:rgb(248, 248, 242)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">static</span><span class="token plain"> </span><span class="token class-name">IntUnaryOperator</span><span class="token plain"> </span><span class="token constant" style="color:rgb(189, 147, 249)">INT_UNARY_OPERATOR_SPECIALIZED</span><span class="token plain"> </span><span class="token operator">=</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">    </span><span class="token constant" style="color:rgb(189, 147, 249)">SPECIALIZER</span><span class="token punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token function" style="color:rgb(80, 250, 123)">specialize</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token constant" style="color:rgb(189, 147, 249)">INT_UNARY_OPERATOR</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token punctuation" style="color:rgb(248, 248, 242)">;</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div>
<h2 class="anchor anchorWithStickyNavbar_LWe7" id="high-flexibility">High flexibility<a href="#high-flexibility" class="hash-link" aria-label="Direct link to High flexibility" title="Direct link to High flexibility">​</a></h2>
<p>ActiveJ Specializer goes far beyond arithmetic equations and can be used in complex scenarios. For example, according to <a href="https://github.com/activej/activej/blob/v6.0-beta2/benchmarks/inject/src/main/java/io/activej/inject/ActiveJDirectScopebindBenchmark.java" target="_blank">benchmarks</a>, ActiveJ Specializer makes the <strong>ActiveJ Inject</strong> DI library one-third faster. To apply ActiveJ Specializer to ActiveJ Inject, simply add <code>Injector.useSpecializer()</code> before instantiating Injector.</p>
<h2 class="anchor anchorWithStickyNavbar_LWe7" id="add-activej-specializer-to-your-project">Add ActiveJ Specializer to your project<a href="#add-activej-specializer-to-your-project" class="hash-link" aria-label="Direct link to Add ActiveJ Specializer to your project" title="Direct link to Add ActiveJ Specializer to your project">​</a></h2>
<p>You can add ActiveJ Specializer to your project by importing its Maven repository.
These docs cover the most recent release of ActiveJ Specializer <strong>v6.0-beta2</strong> (see on <a href="https://github.com/activej/activej/tree/v6.0-beta2/core-specializer" target="_blank">Github</a> or <a href="https://mvnrepository.com/artifact/io.activej/activej-specializer" target="_blank" rel="noopener noreferrer">Maven</a>).</p></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/serializer/examples"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Examples</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/specializer/examples"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Examples</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#how-it-works" class="table-of-contents__link toc-highlight">How it works?</a></li><li><a href="#why-activej-specializer" class="table-of-contents__link toc-highlight">Why ActiveJ Specializer?</a></li><li><a href="#high-flexibility" class="table-of-contents__link toc-highlight">High flexibility</a></li><li><a href="#add-activej-specializer-to-your-project" class="table-of-contents__link toc-highlight">Add ActiveJ Specializer to your project</a></li></ul></div></div></div></div></main></div></div></div><footer class="footer"><div class="container container-fluid"><div class="footer__bottom text--center"><div class="footer__copyright">Copyright © 2024 ActiveJ LLC. All Rights Reserved</div></div></div></footer></div>
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