> ## Documentation Index
> Fetch the complete documentation index at: https://docs.kinetica.com/llms.txt
> Use this file to discover all available pages before exploring further.

# WorkerList

> WorkerList — Kinetica Java API

<div className="kinetica-javadoc">
  <div className="header">
    <div className="sub-title"><span className="package-label-in-type">Package</span> <a href="/content/api/java/com/gpudb/package-summary">com.gpudb</a></div>
    <h1 title="Class WorkerList" className="title">Class WorkerList</h1>
  </div>

  <div className="inheritance" title="Inheritance Tree">
    <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" className="external-link">java.lang.Object</a>

    <div className="inheritance">
      <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/AbstractCollection.html" title="class or interface in java.util" className="external-link">java.util.AbstractCollection</a>\<<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/net/URL.html" title="class or interface in java.net" className="external-link">URL</a>>

      <div className="inheritance">
        <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/AbstractList.html" title="class or interface in java.util" className="external-link">java.util.AbstractList</a>\<<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/net/URL.html" title="class or interface in java.net" className="external-link">URL</a>>

        <div className="inheritance">
          <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/ArrayList.html" title="class or interface in java.util" className="external-link">java.util.ArrayList</a>\<<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/net/URL.html" title="class or interface in java.net" className="external-link">URL</a>>
          <div className="inheritance">com.gpudb.WorkerList</div>
        </div>
      </div>
    </div>
  </div>

  <div className="section class-description" id="class-description">
    <div className="dl notes">
      <div className="dt">All Implemented Interfaces:</div>
      <div className="dd"><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/io/Serializable.html" title="class or interface in java.io" className="external-link">Serializable</a></code>, <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" className="external-link">Cloneable</a></code>, <code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Iterable.html" title="class or interface in java.lang" className="external-link">Iterable</a>\<<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/net/URL.html" title="class or interface in java.net" className="external-link">URL</a>></code>, <code><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" className="external-link">Collection</a>\<<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/net/URL.html" title="class or interface in java.net" className="external-link">URL</a>></code>, <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" className="external-link">List</a>\<<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/net/URL.html" title="class or interface in java.net" className="external-link">URL</a>></code>, <code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/RandomAccess.html" title="class or interface in java.util" className="external-link">RandomAccess</a></code></div>
    </div>

    <div className="dl notes">
      <div className="dt">Direct Known Subclasses:</div>
      <div className="dd"><code><a href="/content/api/java/com/gpudb/BulkInserter.WorkerList" title="class in com.gpudb">BulkInserter.WorkerList</a></code></div>
    </div>

    <hr />

    <div className="type-signature"><span className="modifiers">public class </span><span className="element-name type-name-label">WorkerList</span> <span className="extends-implements">extends <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/ArrayList.html" title="class or interface in java.util" className="external-link">ArrayList</a>\<<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/net/URL.html" title="class or interface in java.net" className="external-link">URL</a>></span></div>
    <div className="block">A list of worker URLs to use for multi-head operations.</div>

    <div className="dl notes">
      <div className="dt">See Also:</div>

      <div className="dd">
        <ul className="tag-list">
          <li><a href="/content/api/java/serialized-form#com.gpudb.WorkerList">Serialized Form</a></li>
        </ul>
      </div>
    </div>
  </div>

  <div className="section summary">
    <ul className="summary-list">
      <li>
        <div className="section field-summary" id="field-summary">
          <h2>Field Summary</h2>

          <div className="inherited-list">
            <h3 id="fields-inherited-from-class-java.util.AbstractList">Fields inherited from class java.util.<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/AbstractList.html" title="class or interface in java.util" className="external-link">AbstractList</a></h3>
            <code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/AbstractList.html#modCount" title="class or interface in java.util" className="external-link">modCount</a></code>
          </div>
        </div>
      </li>

      <li>
        <div className="section constructor-summary" id="constructor-summary">
          <h2>Constructor Summary</h2>
          <div className="caption"><span>Constructors</span></div>

          <div className="summary-table two-column-summary">
            <div className="table-header col-first">Constructor</div>
            <div className="table-header col-last">Description</div>
            <div className="col-constructor-name even-row-color"><code><a href="#%3Cinit%3E()" className="member-name-link">WorkerList</a>()</code></div>

            <div className="col-last even-row-color">
              <div className="block">Creates an empty <a href="/content/api/java/com/gpudb/WorkerList" title="class in com.gpudb"><code>WorkerList</code></a> that can be populated manually with worker URLs to support multi-head operations.</div>
            </div>

            <div className="col-constructor-name odd-row-color"><code><a href="#%3Cinit%3E(com.gpudb.GPUdb)" className="member-name-link">WorkerList</a><wbr />(<a href="/content/api/java/com/gpudb/GPUdb" title="class in com.gpudb">GPUdb</a> gpudb)</code></div>

            <div className="col-last odd-row-color">
              <div className="block">Creates a <a href="/content/api/java/com/gpudb/WorkerList" title="class in com.gpudb"><code>WorkerList</code></a> and automatically populates it with the worker URLs from GPUdb to support multi-head operations.</div>
            </div>

            <div className="col-constructor-name even-row-color"><code><a href="#%3Cinit%3E(com.gpudb.GPUdb,java.lang.String)" className="member-name-link">WorkerList</a><wbr />(<a href="/content/api/java/com/gpudb/GPUdb" title="class in com.gpudb">GPUdb</a> gpudb, <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" className="external-link">String</a> ipPrefix)</code></div>

            <div className="col-last even-row-color">
              <div className="block">Creates a <a href="/content/api/java/com/gpudb/WorkerList" title="class in com.gpudb"><code>WorkerList</code></a> and automatically populates it with the worker URLs from GPUdb to support multi-head operations.</div>
            </div>

            <div className="col-constructor-name odd-row-color"><code><a href="#%3Cinit%3E(com.gpudb.GPUdb,java.util.regex.Pattern)" className="member-name-link">WorkerList</a><wbr />(<a href="/content/api/java/com/gpudb/GPUdb" title="class in com.gpudb">GPUdb</a> gpudb, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/regex/Pattern.html" title="class or interface in java.util.regex" className="external-link">Pattern</a> ipRegex)</code></div>

            <div className="col-last odd-row-color">
              <div className="block">Creates a <a href="/content/api/java/com/gpudb/WorkerList" title="class in com.gpudb"><code>WorkerList</code></a> and automatically populates it with the worker URLs from GPUdb to support multi-head operations.</div>
            </div>

            <div className="col-constructor-name even-row-color"><code><a href="#%3Cinit%3E(java.util.List)" className="member-name-link">WorkerList</a><wbr />(<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" className="external-link">List</a>\<<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/net/URL.html" title="class or interface in java.net" className="external-link">URL</a>> urls)</code></div>

            <div className="col-last even-row-color">
              <div className="block">Creates a <a href="/content/api/java/com/gpudb/WorkerList" title="class in com.gpudb"><code>WorkerList</code></a> populated with the given URLs.</div>
            </div>
          </div>
        </div>
      </li>

      <li>
        <div className="section method-summary" id="method-summary">
          <h2>Method Summary</h2>

          <div id="method-summary-table">
            <div className="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" className="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" className="table-tab">Instance Methods</button><button id="method-summary-table-tab4" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabIndex="-1" className="table-tab">Concrete Methods</button></div>

            <div id="method-summary-table.tabpanel" role="tabpanel" aria-labelledby="method-summary-table-tab0">
              <div className="summary-table three-column-summary">
                <div className="table-header col-first">Modifier and Type</div>
                <div className="table-header col-second">Method</div>
                <div className="table-header col-last">Description</div>
                <div className="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/regex/Pattern.html" title="class or interface in java.util.regex" className="external-link">Pattern</a></code></div>
                <div className="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#getIpRegex()" className="member-name-link">getIpRegex</a>()</code></div>

                <div className="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
                  <div className="block">Gets the regular expression used to filter this worker list, if one were specified during creation.</div>
                </div>

                <div className="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>boolean</code></div>
                <div className="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#isMultiHeadEnabled()" className="member-name-link">isMultiHeadEnabled</a>()</code></div>

                <div className="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
                  <div className="block">Checks whether multi-head I/O is enabled in the server configuration.</div>
                </div>

                <div className="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>boolean</code></div>
                <div className="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#isQueriedUrlList()" className="member-name-link">isQueriedUrlList</a>()</code></div>

                <div className="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
                  <div className="block">Checks whether this worker list was created by querying the given server for the URLs, or instead, whether they were given explicitly.</div>
                </div>
              </div>
            </div>
          </div>

          <div className="inherited-list">
            <h3 id="methods-inherited-from-class-java.util.ArrayList">Methods inherited from class java.util.<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/ArrayList.html" title="class or interface in java.util" className="external-link">ArrayList</a></h3>
            <code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/ArrayList.html#add(int,E)" title="class or interface in java.util" className="external-link">add</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/ArrayList.html#add(E)" title="class or interface in java.util" className="external-link">add</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/ArrayList.html#addAll(int,java.util.Collection)" title="class or interface in java.util" className="external-link">addAll</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/ArrayList.html#addAll(java.util.Collection)" title="class or interface in java.util" className="external-link">addAll</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/ArrayList.html#clear()" title="class or interface in java.util" className="external-link">clear</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/ArrayList.html#clone()" title="class or interface in java.util" className="external-link">clone</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/ArrayList.html#contains(java.lang.Object)" title="class or interface in java.util" className="external-link">contains</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/ArrayList.html#ensureCapacity(int)" title="class or interface in java.util" className="external-link">ensureCapacity</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/ArrayList.html#equals(java.lang.Object)" title="class or interface in java.util" className="external-link">equals</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/ArrayList.html#forEach(java.util.function.Consumer)" title="class or interface in java.util" className="external-link">forEach</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/ArrayList.html#get(int)" title="class or interface in java.util" className="external-link">get</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/ArrayList.html#hashCode()" title="class or interface in java.util" className="external-link">hashCode</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/ArrayList.html#indexOf(java.lang.Object)" title="class or interface in java.util" className="external-link">indexOf</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/ArrayList.html#isEmpty()" title="class or interface in java.util" className="external-link">isEmpty</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/ArrayList.html#iterator()" title="class or interface in java.util" className="external-link">iterator</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/ArrayList.html#lastIndexOf(java.lang.Object)" title="class or interface in java.util" className="external-link">lastIndexOf</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/ArrayList.html#listIterator()" title="class or interface in java.util" className="external-link">listIterator</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/ArrayList.html#listIterator(int)" title="class or interface in java.util" className="external-link">listIterator</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/ArrayList.html#remove(int)" title="class or interface in java.util" className="external-link">remove</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/ArrayList.html#remove(java.lang.Object)" title="class or interface in java.util" className="external-link">remove</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/ArrayList.html#removeAll(java.util.Collection)" title="class or interface in java.util" className="external-link">removeAll</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/ArrayList.html#removeIf(java.util.function.Predicate)" title="class or interface in java.util" className="external-link">removeIf</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/ArrayList.html#removeRange(int,int)" title="class or interface in java.util" className="external-link">removeRange</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/ArrayList.html#replaceAll(java.util.function.UnaryOperator)" title="class or interface in java.util" className="external-link">replaceAll</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/ArrayList.html#retainAll(java.util.Collection)" title="class or interface in java.util" className="external-link">retainAll</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/ArrayList.html#set(int,E)" title="class or interface in java.util" className="external-link">set</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/ArrayList.html#size()" title="class or interface in java.util" className="external-link">size</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/ArrayList.html#sort(java.util.Comparator)" title="class or interface in java.util" className="external-link">sort</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/ArrayList.html#spliterator()" title="class or interface in java.util" className="external-link">spliterator</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/ArrayList.html#subList(int,int)" title="class or interface in java.util" className="external-link">subList</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/ArrayList.html#toArray()" title="class or interface in java.util" className="external-link">toArray</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/ArrayList.html#toArray(T%5B%5D)" title="class or interface in java.util" className="external-link">toArray</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/ArrayList.html#trimToSize()" title="class or interface in java.util" className="external-link">trimToSize</a></code>
          </div>

          <div className="inherited-list">
            <h3 id="methods-inherited-from-class-java.util.AbstractCollection">Methods inherited from class java.util.<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/AbstractCollection.html" title="class or interface in java.util" className="external-link">AbstractCollection</a></h3>
            <code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/AbstractCollection.html#containsAll(java.util.Collection)" title="class or interface in java.util" className="external-link">containsAll</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/AbstractCollection.html#toString()" title="class or interface in java.util" className="external-link">toString</a></code>
          </div>

          <div className="inherited-list">
            <h3 id="methods-inherited-from-class-java.lang.Object">Methods inherited from class java.lang.<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" className="external-link">Object</a></h3>
            <code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html#finalize()" title="class or interface in java.lang" className="external-link">finalize</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html#getClass()" title="class or interface in java.lang" className="external-link">getClass</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html#notify()" title="class or interface in java.lang" className="external-link">notify</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html#notifyAll()" title="class or interface in java.lang" className="external-link">notifyAll</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html#wait()" title="class or interface in java.lang" className="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html#wait(long)" title="class or interface in java.lang" className="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html#wait(long,int)" title="class or interface in java.lang" className="external-link">wait</a></code>
          </div>

          <div className="inherited-list">
            <h3 id="methods-inherited-from-class-java.util.Collection">Methods inherited from interface java.util.<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" className="external-link">Collection</a></h3>
            <code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Collection.html#parallelStream()" title="class or interface in java.util" className="external-link">parallelStream</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Collection.html#stream()" title="class or interface in java.util" className="external-link">stream</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Collection.html#toArray(java.util.function.IntFunction)" title="class or interface in java.util" className="external-link">toArray</a></code>
          </div>

          <div className="inherited-list">
            <h3 id="methods-inherited-from-class-java.util.List">Methods inherited from interface java.util.<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" className="external-link">List</a></h3>
            <code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/List.html#containsAll(java.util.Collection)" title="class or interface in java.util" className="external-link">containsAll</a></code>
          </div>
        </div>
      </li>
    </ul>
  </div>

  <div className="section details">
    <ul className="details-list">
      <li>
        <div className="section constructor-details" id="constructor-detail">
          <h2>Constructor Details</h2>

          <ul className="member-list">
            <li>
              <div className="section detail" id="<init>()">
                <h3>WorkerList</h3>
                <div className="member-signature"><span className="modifiers">public</span> <span className="element-name">WorkerList</span>()</div>
                <div className="block">Creates an empty <a href="/content/api/java/com/gpudb/WorkerList" title="class in com.gpudb"><code>WorkerList</code></a> that can be populated manually with worker URLs to support multi-head operations. Note that worker URLs must be added in rank order, starting with rank 1, and all worker ranks must be included; otherwise operations may fail for certain data types.</div>
              </div>
            </li>

            <li>
              <div className="section detail" id="<init>(java.util.List)">
                <h3>WorkerList</h3>
                <div className="member-signature"><span className="modifiers">public</span> <span className="element-name">WorkerList</span><wbr /><span className="parameters">(<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" className="external-link">List</a>\<<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/net/URL.html" title="class or interface in java.net" className="external-link">URL</a>> urls)</span></div>
                <div className="block">Creates a <a href="/content/api/java/com/gpudb/WorkerList" title="class in com.gpudb"><code>WorkerList</code></a> populated with the given URLs.</div>
              </div>
            </li>

            <li>
              <div className="section detail" id="<init>(com.gpudb.GPUdb)">
                <h3>WorkerList</h3>
                <div className="member-signature"><span className="modifiers">public</span> <span className="element-name">WorkerList</span><wbr /><span className="parameters">(<a href="/content/api/java/com/gpudb/GPUdb" title="class in com.gpudb">GPUdb</a> gpudb)</span> throws <span className="exceptions"><a href="/content/api/java/com/gpudb/GPUdbException" title="class in com.gpudb">GPUdbException</a></span></div>
                <div className="block">Creates a <a href="/content/api/java/com/gpudb/WorkerList" title="class in com.gpudb"><code>WorkerList</code></a> and automatically populates it with the worker URLs from GPUdb to support multi-head operations. (If the specified GPUdb instance has multi-head operations disabled, the worker list will be empty and multi-head operations will not be used.) Note that in some cases, workers may be configured to use more than one IP address, not all of which may be accessible to the client; this constructor uses the first IP returned by the server for each worker. To override this behavior, use one of the alternate constructors that accepts an <a href="#%3Cinit%3E(com.gpudb.GPUdb,java.util.regex.Pattern)"><code>IP regex</code></a> or an <a href="#%3Cinit%3E(com.gpudb.GPUdb,java.lang.String)"><code>IP prefix</code></a>.</div>

                <div className="dl notes">
                  <div className="dt">Parameters:</div>
                  <div className="dd"><code>gpudb</code> - the <a href="/content/api/java/com/gpudb/GPUdb" title="class in com.gpudb"><code>GPUdb</code></a> instance from which to obtain the worker URLs</div>
                  <div className="dt">Throws:</div>
                  <div className="dd"><code><a href="/content/api/java/com/gpudb/GPUdbException" title="class in com.gpudb">GPUdbException</a></code> - if an error occurs during the request for worker URLs</div>
                </div>
              </div>
            </li>

            <li>
              <div className="section detail" id="<init>(com.gpudb.GPUdb,java.util.regex.Pattern)">
                <h3>WorkerList</h3>
                <div className="member-signature"><span className="modifiers">public</span> <span className="element-name">WorkerList</span><wbr /><span className="parameters">(<a href="/content/api/java/com/gpudb/GPUdb" title="class in com.gpudb">GPUdb</a> gpudb, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/regex/Pattern.html" title="class or interface in java.util.regex" className="external-link">Pattern</a> ipRegex)</span> throws <span className="exceptions"><a href="/content/api/java/com/gpudb/GPUdbException" title="class in com.gpudb">GPUdbException</a></span></div>
                <div className="block">Creates a <a href="/content/api/java/com/gpudb/WorkerList" title="class in com.gpudb"><code>WorkerList</code></a> and automatically populates it with the worker URLs from GPUdb to support multi-head operations. (If the specified GPUdb instance has multi-head operations disabled, the worker list will be empty and multi-head operations will not be used.) Note that in some cases, workers may be configured to use more than one IP address, not all of which may be accessible to the client; the optional <code>ipRegex</code> parameter can be used in such cases to filter for an IP range that is accessible, e.g., a regex of <code>"192\\.168\\..\*"</code> will use worker IP addresses in the 192.168.\* range.</div>

                <div className="dl notes">
                  <div className="dt">Parameters:</div>
                  <div className="dd"><code>gpudb</code> - the <a href="/content/api/java/com/gpudb/GPUdb" title="class in com.gpudb"><code>GPUdb</code></a> instance from which to obtain the worker URLs</div>
                  <div className="dd"><code>ipRegex</code> - optional IP regex to match</div>
                  <div className="dt">Throws:</div>
                  <div className="dd"><code><a href="/content/api/java/com/gpudb/GPUdbException" title="class in com.gpudb">GPUdbException</a></code> - if an error occurs during the request for worker URLs or no IP addresses matching the IP regex could be found for one or more workers</div>
                </div>
              </div>
            </li>

            <li>
              <div className="section detail" id="<init>(com.gpudb.GPUdb,java.lang.String)">
                <h3>WorkerList</h3>
                <div className="member-signature"><span className="modifiers">public</span> <span className="element-name">WorkerList</span><wbr /><span className="parameters">(<a href="/content/api/java/com/gpudb/GPUdb" title="class in com.gpudb">GPUdb</a> gpudb, <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" className="external-link">String</a> ipPrefix)</span> throws <span className="exceptions"><a href="/content/api/java/com/gpudb/GPUdbException" title="class in com.gpudb">GPUdbException</a></span></div>
                <div className="block">Creates a <a href="/content/api/java/com/gpudb/WorkerList" title="class in com.gpudb"><code>WorkerList</code></a> and automatically populates it with the worker URLs from GPUdb to support multi-head operations. (If the specified GPUdb instance has multi-head operations disabled, the worker list will be empty and multi-head operations will not be used.) Note that in some cases, workers may be configured to use more than one IP address, not all of which may be accessible to the client; the optional <code>ipPrefix</code> parameter can be used in such cases to filter for an IP range that is accessible, e.g., a prefix of <code>"192.168."</code> will use worker IP addresses in the 192.168.\* range.</div>

                <div className="dl notes">
                  <div className="dt">Parameters:</div>
                  <div className="dd"><code>gpudb</code> - the <a href="/content/api/java/com/gpudb/GPUdb" title="class in com.gpudb"><code>GPUdb</code></a> instance from which to obtain the worker URLs</div>
                  <div className="dd"><code>ipPrefix</code> - optional IP prefix to match</div>
                  <div className="dt">Throws:</div>
                  <div className="dd"><code><a href="/content/api/java/com/gpudb/GPUdbException" title="class in com.gpudb">GPUdbException</a></code> - if an error occurs during the request for worker URLs or no IP addresses matching the IP prefix could be found for one or more workers</div>
                </div>
              </div>
            </li>
          </ul>
        </div>
      </li>

      <li>
        <div className="section method-details" id="method-detail">
          <h2>Method Details</h2>

          <ul className="member-list">
            <li>
              <div className="section detail" id="getIpRegex()">
                <h3>getIpRegex</h3>
                <div className="member-signature"><span className="modifiers">public</span> <span className="return-type"><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/regex/Pattern.html" title="class or interface in java.util.regex" className="external-link">Pattern</a></span> <span className="element-name">getIpRegex</span>()</div>
                <div className="block">Gets the regular expression used to filter this worker list, if one were specified during creation.</div>

                <div className="dl notes">
                  <div className="dt">Returns:</div>
                  <div className="dd">the regular expression used to create this worker list.</div>
                </div>
              </div>
            </li>

            <li>
              <div className="section detail" id="isMultiHeadEnabled()">
                <h3>isMultiHeadEnabled</h3>
                <div className="member-signature"><span className="modifiers">public</span> <span className="return-type">boolean</span> <span className="element-name">isMultiHeadEnabled</span>()</div>
                <div className="block">Checks whether multi-head I/O is enabled in the server configuration.</div>

                <div className="dl notes">
                  <div className="dt">Returns:</div>
                  <div className="dd">a boolean indicating whether multi-head I/O is enabled on the server.</div>
                </div>
              </div>
            </li>

            <li>
              <div className="section detail" id="isQueriedUrlList()">
                <h3>isQueriedUrlList</h3>
                <div className="member-signature"><span className="modifiers">public</span> <span className="return-type">boolean</span> <span className="element-name">isQueriedUrlList</span>()</div>
                <div className="block">Checks whether this worker list was created by querying the given server for the URLs, or instead, whether they were given explicitly.</div>

                <div className="dl notes">
                  <div className="dt">Returns:</div>
                  <div className="dd">a boolean indicating whether this worker list was created via a server query.</div>
                </div>
              </div>
            </li>
          </ul>
        </div>
      </li>
    </ul>
  </div>
</div>