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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.functions</a></div>
<h1 title="Interface Function" class="title">Interface Function</h1>
</div>
<section class="class-description" id="class-description">
<dl class="notes">
<dt>All Known Implementing Classes:</dt>
<dd><code><a href="AbstractFunction.html" title="class in org.apache.jmeter.functions">AbstractFunction</a></code>, <code><a href="BeanShell.html" title="class in org.apache.jmeter.functions">BeanShell</a></code>, <code><a href="ChangeCase.html" title="class in org.apache.jmeter.functions">ChangeCase</a></code>, <code><a href="CharFunction.html" title="class in org.apache.jmeter.functions">CharFunction</a></code>, <code><a href="../engine/util/CompoundVariable.html" title="class in org.apache.jmeter.engine.util">CompoundVariable</a></code>, <code><a href="CSVRead.html" title="class in org.apache.jmeter.functions">CSVRead</a></code>, <code><a href="DateTimeConvertFunction.html" title="class in org.apache.jmeter.functions">DateTimeConvertFunction</a></code>, <code><a href="DigestEncodeFunction.html" title="class in org.apache.jmeter.functions">DigestEncodeFunction</a></code>, <code><a href="EscapeHtml.html" title="class in org.apache.jmeter.functions">EscapeHtml</a></code>, <code><a href="EscapeOroRegexpChars.html" title="class in org.apache.jmeter.functions">EscapeOroRegexpChars</a></code>, <code><a href="EscapeXml.html" title="class in org.apache.jmeter.functions">EscapeXml</a></code>, <code><a href="EvalFunction.html" title="class in org.apache.jmeter.functions">EvalFunction</a></code>, <code><a href="EvalVarFunction.html" title="class in org.apache.jmeter.functions">EvalVarFunction</a></code>, <code><a href="FileToString.html" title="class in org.apache.jmeter.functions">FileToString</a></code>, <code><a href="Groovy.html" title="class in org.apache.jmeter.functions">Groovy</a></code>, <code><a href="IntSum.html" title="class in org.apache.jmeter.functions">IntSum</a></code>, <code><a href="IsPropDefined.html" title="class in org.apache.jmeter.functions">IsPropDefined</a></code>, <code><a href="IsVarDefined.html" title="class in org.apache.jmeter.functions">IsVarDefined</a></code>, <code><a href="IterationCounter.html" title="class in org.apache.jmeter.functions">IterationCounter</a></code>, <code><a href="JavaScript.html" title="class in org.apache.jmeter.functions">JavaScript</a></code>, <code><a href="Jexl2Function.html" title="class in org.apache.jmeter.functions">Jexl2Function</a></code>, <code><a href="Jexl3Function.html" title="class in org.apache.jmeter.functions">Jexl3Function</a></code>, <code><a href="LogFunction.html" title="class in org.apache.jmeter.functions">LogFunction</a></code>, <code><a href="LogFunction2.html" title="class in org.apache.jmeter.functions">LogFunction2</a></code>, <code><a href="LongSum.html" title="class in org.apache.jmeter.functions">LongSum</a></code>, <code><a href="MachineIP.html" title="class in org.apache.jmeter.functions">MachineIP</a></code>, <code><a href="MachineName.html" title="class in org.apache.jmeter.functions">MachineName</a></code>, <code><a href="Property.html" title="class in org.apache.jmeter.functions">Property</a></code>, <code><a href="Property2.html" title="class in org.apache.jmeter.functions">Property2</a></code>, <code><a href="Random.html" title="class in org.apache.jmeter.functions">Random</a></code>, <code><a href="RandomDate.html" title="class in org.apache.jmeter.functions">RandomDate</a></code>, <code><a href="RandomFromMultipleVars.html" title="class in org.apache.jmeter.functions">RandomFromMultipleVars</a></code>, <code><a href="RandomString.html" title="class in org.apache.jmeter.functions">RandomString</a></code>, <code><a href="RegexFunction.html" title="class in org.apache.jmeter.functions">RegexFunction</a></code>, <code><a href="SamplerName.html" title="class in org.apache.jmeter.functions">SamplerName</a></code>, <code><a href="SetProperty.html" title="class in org.apache.jmeter.functions">SetProperty</a></code>, <code><a href="SplitFunction.html" title="class in org.apache.jmeter.functions">SplitFunction</a></code>, <code><a href="StringFromFile.html" title="class in org.apache.jmeter.functions">StringFromFile</a></code>, <code><a href="StringToFile.html" title="class in org.apache.jmeter.functions">StringToFile</a></code>, <code><a href="TestPlanName.html" title="class in org.apache.jmeter.functions">TestPlanName</a></code>, <code><a href="ThreadGroupName.html" title="class in org.apache.jmeter.functions">ThreadGroupName</a></code>, <code><a href="ThreadNumber.html" title="class in org.apache.jmeter.functions">ThreadNumber</a></code>, <code><a href="TimeFunction.html" title="class in org.apache.jmeter.functions">TimeFunction</a></code>, <code><a href="TimeShift.html" title="class in org.apache.jmeter.functions">TimeShift</a></code>, <code><a href="UnEscape.html" title="class in org.apache.jmeter.functions">UnEscape</a></code>, <code><a href="UnEscapeHtml.html" title="class in org.apache.jmeter.functions">UnEscapeHtml</a></code>, <code><a href="UrlDecode.html" title="class in org.apache.jmeter.functions">UrlDecode</a></code>, <code><a href="UrlEncode.html" title="class in org.apache.jmeter.functions">UrlEncode</a></code>, <code><a href="Uuid.html" title="class in org.apache.jmeter.functions">Uuid</a></code>, <code><a href="Variable.html" title="class in org.apache.jmeter.functions">Variable</a></code>, <code><a href="XPath.html" title="class in org.apache.jmeter.functions">XPath</a></code></dd>
</dl>
<hr>
<div class="type-signature"><span class="modifiers">public interface </span><span class="element-name type-name-label">Function</span></div>
<div class="block">Methods that a function must implement</div>
</section>
<section class="summary">
<ul class="summary-list">
<!-- ========== 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><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a></code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#execute(org.apache.jmeter.samplers.SampleResult,org.apache.jmeter.samplers.Sampler)" class="member-name-link">execute</a><wbr>(<a href="../samplers/SampleResult.html" title="class in org.apache.jmeter.samplers">SampleResult</a>&nbsp;previousResult,
<a href="../samplers/Sampler.html" title="interface in org.apache.jmeter.samplers">Sampler</a>&nbsp;currentSampler)</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3">
<div class="block">Given the previous SampleResult and the current Sampler, return a string
to use as a replacement value for the function call.</div>
</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&gt;</code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#getArgumentDesc()" class="member-name-link">getArgumentDesc</a>()</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3">
<div class="block">Return a list of strings briefly describing each parameter your function
takes.</div>
</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a></code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#getReferenceKey()" class="member-name-link">getReferenceKey</a>()</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3">
<div class="block">Return the name of your function.</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="#setParameters(java.util.Collection)" class="member-name-link">setParameters</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Collection.html" title="class or interface in java.util" class="external-link">Collection</a>&lt;<a href="../engine/util/CompoundVariable.html" title="class in org.apache.jmeter.engine.util">CompoundVariable</a>&gt;&nbsp;parameters)</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3">
<div class="block">A collection of the parameters used to configure your function.</div>
</div>
</div>
</div>
</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="execute(org.apache.jmeter.samplers.SampleResult,org.apache.jmeter.samplers.Sampler)">
<h3>execute</h3>
<div class="member-signature"><span class="return-type"><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a></span>&nbsp;<span class="element-name">execute</span><wbr><span class="parameters">(<a href="../samplers/SampleResult.html" title="class in org.apache.jmeter.samplers">SampleResult</a>&nbsp;previousResult,
<a href="../samplers/Sampler.html" title="interface in org.apache.jmeter.samplers">Sampler</a>&nbsp;currentSampler)</span>
throws <span class="exceptions"><a href="InvalidVariableException.html" title="class in org.apache.jmeter.functions">InvalidVariableException</a></span></div>
<div class="block">Given the previous SampleResult and the current Sampler, return a string
to use as a replacement value for the function call. Assume
"setParameter" was previously called.
<p>This method must be thread-safe - multiple threads will be using the same
object.</p></div>
<dl class="notes">
<dt>Parameters:</dt>
<dd><code>previousResult</code> - The previous <a href="../samplers/SampleResult.html" title="class in org.apache.jmeter.samplers"><code>SampleResult</code></a></dd>
<dd><code>currentSampler</code> - The current <a href="../samplers/Sampler.html" title="interface in org.apache.jmeter.samplers"><code>Sampler</code></a></dd>
<dt>Returns:</dt>
<dd>The replacement value, which was generated by the function</dd>
<dt>Throws:</dt>
<dd><code><a href="InvalidVariableException.html" title="class in org.apache.jmeter.functions">InvalidVariableException</a></code> - - when the variables for the function call can't be evaluated</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="setParameters(java.util.Collection)">
<h3>setParameters</h3>
<div class="member-signature"><span class="return-type">void</span>&nbsp;<span class="element-name">setParameters</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Collection.html" title="class or interface in java.util" class="external-link">Collection</a>&lt;<a href="../engine/util/CompoundVariable.html" title="class in org.apache.jmeter.engine.util">CompoundVariable</a>&gt;&nbsp;parameters)</span>
throws <span class="exceptions"><a href="InvalidVariableException.html" title="class in org.apache.jmeter.functions">InvalidVariableException</a></span></div>
<div class="block">A collection of the parameters used to configure your function. Each
parameter is a CompoundVariable and can be resolved by calling the
execute() method of the CompoundVariable (which should be done at
execution.)</div>
<dl class="notes">
<dt>Parameters:</dt>
<dd><code>parameters</code> - The parameters for the function call</dd>
<dt>Throws:</dt>
<dd><code><a href="InvalidVariableException.html" title="class in org.apache.jmeter.functions">InvalidVariableException</a></code> - - when the variables for the function call can't be evaluated</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="getReferenceKey()">
<h3>getReferenceKey</h3>
<div class="member-signature"><span class="return-type"><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a></span>&nbsp;<span class="element-name">getReferenceKey</span>()</div>
<div class="block">Return the name of your function. Convention is to prepend "__" to the
name (ie "__regexFunction")</div>
<dl class="notes">
<dt>Returns:</dt>
<dd>The name of the function</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="getArgumentDesc()">
<h3>getArgumentDesc</h3>
<div class="member-signature"><span class="return-type"><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&gt;</span>&nbsp;<span class="element-name">getArgumentDesc</span>()</div>
<div class="block">Return a list of strings briefly describing each parameter your function
takes. Please use JMeterUtils.getResString(resource_name) to grab a
resource string. Otherwise, your help text will be difficult to
internationalize.
This list is not optional. If you don't wish to write help, you must at
least return a List containing the correct number of blank strings, one
for each argument.</div>
<dl class="notes">
<dt>Returns:</dt>
<dd>List with brief descriptions for each parameter the function takes</dd>
</dl>
</section>
</li>
</ul>
</section>
</li>
</ul>
</section>
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