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<title>Controller (Apache JMeter dist API)</title>
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<div class="sub-title"><span class="package-label-in-type">Package</span>&nbsp;<a href="package-summary.html">org.apache.jmeter.control</a></div>
<h1 title="Interface Controller" class="title">Interface Controller</h1>
</div>
<section class="class-description" id="class-description">
<dl class="notes">
<dt>All Superinterfaces:</dt>
<dd><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Cloneable.html" title="class or interface in java.lang" class="external-link">Cloneable</a></code>, <code>org.apache.jmeter.testelement.TestElement</code></dd>
</dl>
<dl class="notes">
<dt>All Known Implementing Classes:</dt>
<dd><code><a href="../threads/AbstractThreadGroup.html" title="class in org.apache.jmeter.threads">AbstractThreadGroup</a></code>, <code><a href="CriticalSectionController.html" title="class in org.apache.jmeter.control">CriticalSectionController</a></code>, <code><a href="ForeachController.html" title="class in org.apache.jmeter.control">ForeachController</a></code>, <code><a href="GenericController.html" title="class in org.apache.jmeter.control">GenericController</a></code>, <code><a href="IfController.html" title="class in org.apache.jmeter.control">IfController</a></code>, <code><a href="IncludeController.html" title="class in org.apache.jmeter.control">IncludeController</a></code>, <code><a href="InterleaveControl.html" title="class in org.apache.jmeter.control">InterleaveControl</a></code>, <code><a href="LoopController.html" title="class in org.apache.jmeter.control">LoopController</a></code>, <code><a href="ModuleController.html" title="class in org.apache.jmeter.control">ModuleController</a></code>, <code><a href="OnceOnlyController.html" title="class in org.apache.jmeter.control">OnceOnlyController</a></code>, <code><a href="../threads/PostThreadGroup.html" title="class in org.apache.jmeter.threads">PostThreadGroup</a></code>, <code><a href="../protocol/http/proxy/ProxyControl.html" title="class in org.apache.jmeter.protocol.http.proxy">ProxyControl</a></code>, <code><a href="RandomController.html" title="class in org.apache.jmeter.control">RandomController</a></code>, <code><a href="RandomOrderController.html" title="class in org.apache.jmeter.control">RandomOrderController</a></code>, <code><a href="../protocol/http/control/RecordingController.html" title="class in org.apache.jmeter.protocol.http.control">RecordingController</a></code>, <code><a href="RunTime.html" title="class in org.apache.jmeter.control">RunTime</a></code>, <code><a href="../threads/SetupThreadGroup.html" title="class in org.apache.jmeter.threads">SetupThreadGroup</a></code>, <code><a href="SwitchController.html" title="class in org.apache.jmeter.control">SwitchController</a></code>, <code><a href="TestFragmentController.html" title="class in org.apache.jmeter.control">TestFragmentController</a></code>, <code><a href="../threads/ThreadGroup.html" title="class in org.apache.jmeter.threads">ThreadGroup</a></code>, <code><a href="ThroughputController.html" title="class in org.apache.jmeter.control">ThroughputController</a></code>, <code><a href="TransactionController.html" title="class in org.apache.jmeter.control">TransactionController</a></code>, <code><a href="WhileController.html" title="class in org.apache.jmeter.control">WhileController</a></code></dd>
</dl>
<hr>
<div class="type-signature"><span class="modifiers">public interface </span><span class="element-name type-name-label">Controller</span><span class="extends-implements">
extends org.apache.jmeter.testelement.TestElement</span></div>
<div class="block">This interface is used by JMeterThread in the following manner:
<p>
<code>while (running &amp;&amp; (sampler = controller.next()) != null)</code></div>
</section>
<section class="summary">
<ul class="summary-list">
<!-- ======== NESTED CLASS SUMMARY ======== -->
<li>
<section class="nested-class-summary" id="nested-class-summary">
<h2>Nested Class Summary</h2>
<div class="inherited-list">
<h2 id="nested-classes-inherited-from-class-org.apache.jmeter.testelement.TestElement">Nested classes/interfaces inherited from interface&nbsp;org.apache.jmeter.testelement.TestElement</h2>
<code>org.apache.jmeter.testelement.TestElement.Companion</code></div>
</section>
</li>
<!-- =========== FIELD SUMMARY =========== -->
<li>
<section class="field-summary" id="field-summary">
<h2>Field Summary</h2>
<div class="inherited-list">
<h3 id="fields-inherited-from-class-org.apache.jmeter.testelement.TestElement">Fields inherited from interface&nbsp;org.apache.jmeter.testelement.TestElement</h3>
<code>COMMENTS, Companion, ENABLED, GUI_CLASS, NAME, TEST_CLASS</code></div>
</section>
</li>
<!-- ========== METHOD SUMMARY =========== -->
<li>
<section class="method-summary" id="method-summary">
<h2>Method Summary</h2>
<div id="method-summary-table">
<div class="table-tabs" role="tablist" aria-orientation="horizontal"><button id="method-summary-table-tab0" role="tab" aria-selected="true" aria-controls="method-summary-table.tabpanel" tabindex="0" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table', 3)" class="active-table-tab">All Methods</button><button id="method-summary-table-tab2" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab2', 3)" class="table-tab">Instance Methods</button><button id="method-summary-table-tab3" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab3', 3)" class="table-tab">Abstract Methods</button></div>
<div id="method-summary-table.tabpanel" role="tabpanel">
<div class="summary-table three-column-summary" aria-labelledby="method-summary-table-tab0">
<div class="table-header col-first">Modifier and Type</div>
<div class="table-header col-second">Method</div>
<div class="table-header col-last">Description</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code>void</code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#addIterationListener(org.apache.jmeter.engine.event.LoopIterationListener)" class="member-name-link">addIterationListener</a><wbr>(<a href="../engine/event/LoopIterationListener.html" title="interface in org.apache.jmeter.engine.event">LoopIterationListener</a>&nbsp;listener)</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3">
<div class="block">Controllers have to notify listeners of when they begin an iteration
through their sub-elements.</div>
</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code>void</code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#initialize()" class="member-name-link">initialize</a>()</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3">
<div class="block">Called to initialize a controller at the beginning of a test iteration.</div>
</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code>boolean</code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#isDone()" class="member-name-link">isDone</a>()</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3">
<div class="block">Indicates whether the Controller is done delivering Samplers for the rest
of the test.</div>
</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="../samplers/Sampler.html" title="interface in org.apache.jmeter.samplers">Sampler</a></code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#next()" class="member-name-link">next</a>()</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3">
<div class="block">Delivers the next Sampler or null</div>
</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code>void</code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#removeIterationListener(org.apache.jmeter.engine.event.LoopIterationListener)" class="member-name-link">removeIterationListener</a><wbr>(<a href="../engine/event/LoopIterationListener.html" title="interface in org.apache.jmeter.engine.event">LoopIterationListener</a>&nbsp;iterationListener)</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3">
<div class="block">Unregister IterationListener</div>
</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code>void</code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#triggerEndOfLoop()" class="member-name-link">triggerEndOfLoop</a>()</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3">
<div class="block">Trigger end of loop condition on controller (used by Start Next Loop feature)</div>
</div>
</div>
</div>
</div>
<div class="inherited-list">
<h3 id="methods-inherited-from-class-org.apache.jmeter.testelement.TestElement">Methods inherited from interface&nbsp;org.apache.jmeter.testelement.TestElement</h3>
<code>addTestElement, canRemove, clear, clearTestElementChildren, clone, get, get, get, get, get, get, get, get, get, getComment, getName, getOrCreate, getOrCreate, getOrNull, getOrNull, getOrNull, getProperty, getPropertyAsBoolean, getPropertyAsBoolean, getPropertyAsDouble, getPropertyAsFloat, getPropertyAsInt, getPropertyAsInt, getPropertyAsLong, getPropertyAsLong, getPropertyAsString, getPropertyAsString, getPropertyOrNull, getPropertyOrNull, getProps, getSchema, getString, getThreadContext, getThreadName, isEnabled, isRunningVersion, isTemporary, propertyIterator, recoverRunningVersion, removed, removeProperty, removeProperty, set, set, set, set, set, set, set, set, set, setComment, setEnabled, setName, setProperty, setProperty, setProperty, setProperty, setProperty, setProperty, setProperty, setProperty, setProperty, setRunningVersion, setTemporary, setThreadContext, setThreadName, traverse</code></div>
</section>
</li>
</ul>
</section>
<section class="details">
<ul class="details-list">
<!-- ============ METHOD DETAIL ========== -->
<li>
<section class="method-details" id="method-detail">
<h2>Method Details</h2>
<ul class="member-list">
<li>
<section class="detail" id="next()">
<h3>next</h3>
<div class="member-signature"><span class="return-type"><a href="../samplers/Sampler.html" title="interface in org.apache.jmeter.samplers">Sampler</a></span>&nbsp;<span class="element-name">next</span>()</div>
<div class="block">Delivers the next Sampler or null</div>
<dl class="notes">
<dt>Returns:</dt>
<dd>org.apache.jmeter.samplers.Sampler or null</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="isDone()">
<h3>isDone</h3>
<div class="member-signature"><span class="return-type">boolean</span>&nbsp;<span class="element-name">isDone</span>()</div>
<div class="block">Indicates whether the Controller is done delivering Samplers for the rest
of the test.
When the top-level controller returns true to JMeterThread,
the thread is complete.</div>
<dl class="notes">
<dt>Returns:</dt>
<dd>boolean</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="addIterationListener(org.apache.jmeter.engine.event.LoopIterationListener)">
<h3>addIterationListener</h3>
<div class="member-signature"><span class="return-type">void</span>&nbsp;<span class="element-name">addIterationListener</span><wbr><span class="parameters">(<a href="../engine/event/LoopIterationListener.html" title="interface in org.apache.jmeter.engine.event">LoopIterationListener</a>&nbsp;listener)</span></div>
<div class="block">Controllers have to notify listeners of when they begin an iteration
through their sub-elements.</div>
<dl class="notes">
<dt>Parameters:</dt>
<dd><code>listener</code> - The <a href="../engine/event/LoopIterationListener.html" title="interface in org.apache.jmeter.engine.event"><code>LoopIterationListener</code></a> to add</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="initialize()">
<h3>initialize</h3>
<div class="member-signature"><span class="return-type">void</span>&nbsp;<span class="element-name">initialize</span>()</div>
<div class="block">Called to initialize a controller at the beginning of a test iteration.</div>
</section>
</li>
<li>
<section class="detail" id="removeIterationListener(org.apache.jmeter.engine.event.LoopIterationListener)">
<h3>removeIterationListener</h3>
<div class="member-signature"><span class="return-type">void</span>&nbsp;<span class="element-name">removeIterationListener</span><wbr><span class="parameters">(<a href="../engine/event/LoopIterationListener.html" title="interface in org.apache.jmeter.engine.event">LoopIterationListener</a>&nbsp;iterationListener)</span></div>
<div class="block">Unregister IterationListener</div>
<dl class="notes">
<dt>Parameters:</dt>
<dd><code>iterationListener</code> - <a href="../engine/event/LoopIterationListener.html" title="interface in org.apache.jmeter.engine.event"><code>LoopIterationListener</code></a></dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="triggerEndOfLoop()">
<h3>triggerEndOfLoop</h3>
<div class="member-signature"><span class="return-type">void</span>&nbsp;<span class="element-name">triggerEndOfLoop</span>()</div>
<div class="block">Trigger end of loop condition on controller (used by Start Next Loop feature)</div>
</section>
</li>
</ul>
</section>
</li>
</ul>
</section>
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