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<section id="development-guidelines">
<h1><a class="toc-backref" href="#id1" role="doc-backlink">Development Guidelines</a><a class="headerlink" href="#development-guidelines" title="Permalink to this heading">#</a></h1>
<nav class="contents" id="contents">
<p class="topic-title">Contents</p>
<ul class="simple">
<li><p><a class="reference internal" href="#development-guidelines" id="id1">Development Guidelines</a></p>
<ul>
<li><p><a class="reference internal" href="#logger-abstraction" id="id2">Logger Abstraction</a></p></li>
<li><p><a class="reference internal" href="#unit-testing" id="id3">Unit Testing</a></p></li>
<li><p><a class="reference internal" href="#performance-testing" id="id4">Performance Testing</a></p></li>
<li><p><a class="reference internal" href="#integration-testing" id="id5">Integration Testing</a></p></li>
<li><p><a class="reference internal" href="#code-style" id="id6">Code Style</a></p></li>
</ul>
</li>
</ul>
</nav>
<section id="logger-abstraction">
<h2><a class="toc-backref" href="#id2" role="doc-backlink">Logger Abstraction</a><a class="headerlink" href="#logger-abstraction" title="Permalink to this heading">#</a></h2>
<p>Apache Arrow Java uses the SLF4J API, so please configure SLF4J to see logs (e.g. via Logback/Apache Log4j):</p>
<ol class="arabic simple">
<li><p>If no jar dependencies are added by the user via Logback or Apache Log4j then SLF4J will default
to no-operation (NOP) logging.</p></li>
<li><p>If a user adds any dependencies via Logback or Apache Log4j but does not configure/add/define
logback.xml/log4j2.xml, then logs will default to DEBUG mode.</p></li>
<li><p>To disable debug logs, the user must define their own rules within their logback.xml/log4j2.xml
and define their own loggers.</p></li>
</ol>
</section>
<section id="unit-testing">
<h2><a class="toc-backref" href="#id3" role="doc-backlink">Unit Testing</a><a class="headerlink" href="#unit-testing" title="Permalink to this heading">#</a></h2>
<p>Unit tests are run by Maven during the build.</p>
<p>To speed up the build, you can skip them by passing -DskipTests.</p>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span><span class="nb">cd</span><span class="w"> </span>arrow/java
<span class="gp">$ </span>mvn<span class="w"> </span><span class="se">\</span>
<span class="w"> </span>-Darrow.cpp.build.dir<span class="o">=</span>../java-dist/lib<span class="w"> </span>-Parrow-jni<span class="w"> </span><span class="se">\</span>
<span class="w"> </span>-Darrow.c.jni.dist.dir<span class="o">=</span>../java-dist/lib<span class="w"> </span>-Parrow-c-data<span class="w"> </span><span class="se">\</span>
<span class="w"> </span>clean<span class="w"> </span>install
</pre></div>
</div>
</section>
<section id="performance-testing">
<h2><a class="toc-backref" href="#id4" role="doc-backlink">Performance Testing</a><a class="headerlink" href="#performance-testing" title="Permalink to this heading">#</a></h2>
<p>The <code class="docutils literal notranslate"><span class="pre">arrow-performance</span></code> module contains benchmarks.</p>
<p>Let’s configure our environment to run performance tests:</p>
<ul class="simple">
<li><p>Install <a class="reference external" href="https://github.com/ursacomputing/benchmarks">benchmark</a></p></li>
<li><p>Install <a class="reference external" href="https://github.com/apache/arrow/blob/main/dev/conbench_envs/README.md#L188">archery</a></p></li>
</ul>
<p>In case you need to see your performance tests on the UI, then, configure (optional):</p>
<ul class="simple">
<li><p>Install <a class="reference external" href="https://github.com/conbench/conbench">conbench</a></p></li>
</ul>
<p>Lets execute benchmark tests:</p>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span><span class="nb">cd</span><span class="w"> </span>benchmarks
<span class="gp">$ </span>conbench<span class="w"> </span>java-micro<span class="w"> </span>--help
<span class="gp">$ </span>conbench<span class="w"> </span>java-micro
<span class="go"> --iterations=1</span>
<span class="go"> --commit=e90472e35b40f58b17d408438bb8de1641bfe6ef</span>
<span class="go"> --java-home=&lt;absolute path to your java home&gt;</span>
<span class="go"> --src=&lt;absolute path to your arrow project&gt;</span>
<span class="go"> --benchmark-filter=org.apache.arrow.adapter.AvroAdapterBenchmarks.testAvroToArrow</span>
<span class="go">Benchmark Mode Cnt Score Error Units</span>
<span class="go">AvroAdapterBenchmarks.testAvroToArrow avgt 725545.783 ns/op</span>
<span class="go">Time to POST http://localhost:5000/api/login/ 0.14911699295043945</span>
<span class="go">Time to POST http://localhost:5000/api/benchmarks/ 0.06116318702697754</span>
</pre></div>
</div>
<p>Then go to: <a class="reference external" href="http://127.0.0.1:5000/">http://127.0.0.1:5000/</a> to see reports:</p>
<p>UI Home:</p>
<img alt="../../_images/conbench_ui.png" src="../../_images/conbench_ui.png" />
<p>UI Runs:</p>
<img alt="../../_images/conbench_runs.png" src="../../_images/conbench_runs.png" />
<p>UI Benchmark:</p>
<img alt="../../_images/conbench_benchmark.png" src="../../_images/conbench_benchmark.png" />
</section>
<section id="integration-testing">
<h2><a class="toc-backref" href="#id5" role="doc-backlink">Integration Testing</a><a class="headerlink" href="#integration-testing" title="Permalink to this heading">#</a></h2>
<p>Integration tests can be run <a class="reference internal" href="../../format/Integration.html#running-integration-tests"><span class="std std-ref">via Archery</span></a>.
For example, assuming you only built Arrow Java and want to run the IPC
integration tests, you would do:</p>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>archery<span class="w"> </span>integration<span class="w"> </span>--run-ipc<span class="w"> </span>--with-java<span class="w"> </span><span class="m">1</span>
</pre></div>
</div>
</section>
<section id="code-style">
<h2><a class="toc-backref" href="#id6" role="doc-backlink">Code Style</a><a class="headerlink" href="#code-style" title="Permalink to this heading">#</a></h2>
<p>Java code style is enforced with Checkstyle. The configuration is located at <a class="reference external" href="https://github.com/apache/arrow/blob/main/java/dev/checkstyle/checkstyle.xml">checkstyle</a>.
You can also just check the style without building the project.
This checks the code style of all source code under the current directory or from within an individual module.</p>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>mvn<span class="w"> </span>checkstyle:check
</pre></div>
</div>
<p>Maven <cite>pom.xml</cite> style is enforced with Spotless using <a class="reference external" href="https://maven.apache.org/developers/conventions/code.html#pom-code-convention">Apache Maven pom.xml guidelines</a>
You can also just check the style without building the project.
This checks the style of all pom.xml files under the current directory or from within an individual module.</p>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>mvn<span class="w"> </span>spotless:check
</pre></div>
</div>
<p>This applies the style to all pom.xml files under the current directory or from within an individual module.</p>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>mvn<span class="w"> </span>spotless:apply
</pre></div>
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