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<h2 title="Class CallableBackgroundInitializer" class="title">Class CallableBackgroundInitializer&lt;T&gt;</h2>
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<li><a href="../../../../../org/apache/commons/lang3/concurrent/BackgroundInitializer.html" title="class in org.apache.commons.lang3.concurrent">org.apache.commons.lang3.concurrent.BackgroundInitializer</a>&lt;T&gt;</li>
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<dd><code>T</code> - the type of the object managed by this initializer class</dd>
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<dl>
<dt>All Implemented Interfaces:</dt>
<dd><code><a href="../../../../../org/apache/commons/lang3/concurrent/ConcurrentInitializer.html" title="interface in org.apache.commons.lang3.concurrent">ConcurrentInitializer</a>&lt;T&gt;</code></dd>
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<pre>public class <span class="typeNameLabel">CallableBackgroundInitializer&lt;T&gt;</span>
extends <a href="../../../../../org/apache/commons/lang3/concurrent/BackgroundInitializer.html" title="class in org.apache.commons.lang3.concurrent">BackgroundInitializer</a>&lt;T&gt;</pre>
<div class="block"><p>
 A specialized <a href="../../../../../org/apache/commons/lang3/concurrent/BackgroundInitializer.html" title="class in org.apache.commons.lang3.concurrent"><code>BackgroundInitializer</code></a> implementation that wraps a
 <code>Callable</code> object.
 </p>
 <p>
 An instance of this class is initialized with a <code>Callable</code> object when
 it is constructed. The implementation of the <a href="../../../../../org/apache/commons/lang3/concurrent/CallableBackgroundInitializer.html#initialize--"><code>initialize()</code></a> method
 defined in the super class delegates to this <code>Callable</code> so that the
 <code>Callable</code> is executed in the background thread.
 </p>
 <p>
 The <code>java.util.concurrent.Callable</code> interface is a standard mechanism
 of the JDK to define tasks to be executed by another thread. The <code>
 CallableBackgroundInitializer</code> class allows combining this standard interface
 with the background initializer API.
 </p>
 <p>
 Usage of this class is very similar to the default usage pattern of the
 <a href="../../../../../org/apache/commons/lang3/concurrent/BackgroundInitializer.html" title="class in org.apache.commons.lang3.concurrent"><code>BackgroundInitializer</code></a> class: Just create an instance and provide the
 <code>Callable</code> object to be executed, then call the initializer's
 <a href="../../../../../org/apache/commons/lang3/concurrent/BackgroundInitializer.html#start--"><code>BackgroundInitializer.start()</code></a> method. This causes the <code>Callable</code> to be executed in
 another thread. When the results of the <code>Callable</code> are needed the
 initializer's <a href="../../../../../org/apache/commons/lang3/concurrent/BackgroundInitializer.html#get--"><code>BackgroundInitializer.get()</code></a> method can be called (which may block until
 background execution is complete). The following code fragment shows a
 typical usage example:
 </p>

 <pre>
 // a Callable that performs a complex computation
 Callable&lt;Integer&gt; computationCallable = new MyComputationCallable();
 // setup the background initializer
 CallableBackgroundInitializer&lt;Integer&gt; initializer =
     new CallableBackgroundInitializer(computationCallable);
 initializer.start();
 // Now do some other things. Initialization runs in a parallel thread
 ...
 // Wait for the end of initialization and access the result
 Integer result = initializer.get();
 </pre></div>
<dl>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>3.0</dd>
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<th class="colFirst" scope="col">Constructor</th>
<th class="colLast" scope="col">Description</th>
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<th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="../../../../../org/apache/commons/lang3/concurrent/CallableBackgroundInitializer.html#CallableBackgroundInitializer-java.util.concurrent.Callable-">CallableBackgroundInitializer</a></span>&#8203;(<a href="https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/Callable.html?is-external=true" title="class or interface in java.util.concurrent" class="externalLink">Callable</a>&lt;<a href="../../../../../org/apache/commons/lang3/concurrent/CallableBackgroundInitializer.html" title="type parameter in CallableBackgroundInitializer">T</a>&gt;&nbsp;call)</code></th>
<td class="colLast">
<div class="block">Creates a new instance of <code>CallableBackgroundInitializer</code> and sets
 the <code>Callable</code> to be executed in a background thread.</div>
</td>
</tr>
<tr class="rowColor">
<th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="../../../../../org/apache/commons/lang3/concurrent/CallableBackgroundInitializer.html#CallableBackgroundInitializer-java.util.concurrent.Callable-java.util.concurrent.ExecutorService-">CallableBackgroundInitializer</a></span>&#8203;(<a href="https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/Callable.html?is-external=true" title="class or interface in java.util.concurrent" class="externalLink">Callable</a>&lt;<a href="../../../../../org/apache/commons/lang3/concurrent/CallableBackgroundInitializer.html" title="type parameter in CallableBackgroundInitializer">T</a>&gt;&nbsp;call,
                             <a href="https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/ExecutorService.html?is-external=true" title="class or interface in java.util.concurrent" class="externalLink">ExecutorService</a>&nbsp;exec)</code></th>
<td class="colLast">
<div class="block">Creates a new instance of <code>CallableBackgroundInitializer</code> and
 initializes it with the <code>Callable</code> to be executed in a background
 thread and the <code>ExecutorService</code> for managing the background
 execution.</div>
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<td class="colFirst"><code>protected <a href="../../../../../org/apache/commons/lang3/concurrent/CallableBackgroundInitializer.html" title="type parameter in CallableBackgroundInitializer">T</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../../../org/apache/commons/lang3/concurrent/CallableBackgroundInitializer.html#initialize--">initialize</a></span>()</code></th>
<td class="colLast">
<div class="block">Performs initialization in a background thread.</div>
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<h3>Methods inherited from class&nbsp;org.apache.commons.lang3.concurrent.<a href="../../../../../org/apache/commons/lang3/concurrent/BackgroundInitializer.html" title="class in org.apache.commons.lang3.concurrent">BackgroundInitializer</a></h3>
<code><a href="../../../../../org/apache/commons/lang3/concurrent/BackgroundInitializer.html#get--">get</a>, <a href="../../../../../org/apache/commons/lang3/concurrent/BackgroundInitializer.html#getActiveExecutor--">getActiveExecutor</a>, <a href="../../../../../org/apache/commons/lang3/concurrent/BackgroundInitializer.html#getExternalExecutor--">getExternalExecutor</a>, <a href="../../../../../org/apache/commons/lang3/concurrent/BackgroundInitializer.html#getFuture--">getFuture</a>, <a href="../../../../../org/apache/commons/lang3/concurrent/BackgroundInitializer.html#getTaskCount--">getTaskCount</a>, <a href="../../../../../org/apache/commons/lang3/concurrent/BackgroundInitializer.html#isStarted--">isStarted</a>, <a href="../../../../../org/apache/commons/lang3/concurrent/BackgroundInitializer.html#setExternalExecutor-java.util.concurrent.ExecutorService-">setExternalExecutor</a>, <a href="../../../../../org/apache/commons/lang3/concurrent/BackgroundInitializer.html#start--">start</a></code></li>
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<code><a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang" class="externalLink">clone</a>, <a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang" class="externalLink">equals</a>, <a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang" class="externalLink">finalize</a>, <a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang" class="externalLink">getClass</a>, <a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang" class="externalLink">hashCode</a>, <a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang" class="externalLink">notify</a>, <a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang" class="externalLink">notifyAll</a>, <a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang" class="externalLink">toString</a>, <a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang" class="externalLink">wait</a>, <a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang" class="externalLink">wait</a>, <a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang" class="externalLink">wait</a></code></li>
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<h4>CallableBackgroundInitializer</h4>
<pre>public&nbsp;CallableBackgroundInitializer&#8203;(<a href="https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/Callable.html?is-external=true" title="class or interface in java.util.concurrent" class="externalLink">Callable</a>&lt;<a href="../../../../../org/apache/commons/lang3/concurrent/CallableBackgroundInitializer.html" title="type parameter in CallableBackgroundInitializer">T</a>&gt;&nbsp;call)</pre>
<div class="block">Creates a new instance of <code>CallableBackgroundInitializer</code> and sets
 the <code>Callable</code> to be executed in a background thread.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>call</code> - the <code>Callable</code> (must not be <b>null</b>)</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/7/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang" class="externalLink">IllegalArgumentException</a></code> - if the <code>Callable</code> is <b>null</b></dd>
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<h4>CallableBackgroundInitializer</h4>
<pre>public&nbsp;CallableBackgroundInitializer&#8203;(<a href="https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/Callable.html?is-external=true" title="class or interface in java.util.concurrent" class="externalLink">Callable</a>&lt;<a href="../../../../../org/apache/commons/lang3/concurrent/CallableBackgroundInitializer.html" title="type parameter in CallableBackgroundInitializer">T</a>&gt;&nbsp;call,
                                     <a href="https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/ExecutorService.html?is-external=true" title="class or interface in java.util.concurrent" class="externalLink">ExecutorService</a>&nbsp;exec)</pre>
<div class="block">Creates a new instance of <code>CallableBackgroundInitializer</code> and
 initializes it with the <code>Callable</code> to be executed in a background
 thread and the <code>ExecutorService</code> for managing the background
 execution.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>call</code> - the <code>Callable</code> (must not be <b>null</b>)</dd>
<dd><code>exec</code> - an external <code>ExecutorService</code> to be used for task
 execution</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/7/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang" class="externalLink">IllegalArgumentException</a></code> - if the <code>Callable</code> is <b>null</b></dd>
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<h4>initialize</h4>
<pre>protected&nbsp;<a href="../../../../../org/apache/commons/lang3/concurrent/CallableBackgroundInitializer.html" title="type parameter in CallableBackgroundInitializer">T</a>&nbsp;initialize()
                throws <a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang" class="externalLink">Exception</a></pre>
<div class="block">Performs initialization in a background thread. This implementation
 delegates to the <code>Callable</code> passed at construction time of this
 object.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/lang3/concurrent/BackgroundInitializer.html#initialize--">initialize</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../org/apache/commons/lang3/concurrent/BackgroundInitializer.html" title="class in org.apache.commons.lang3.concurrent">BackgroundInitializer</a>&lt;<a href="../../../../../org/apache/commons/lang3/concurrent/CallableBackgroundInitializer.html" title="type parameter in CallableBackgroundInitializer">T</a>&gt;</code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the result of the initialization</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang" class="externalLink">Exception</a></code> - if an error occurs</dd>
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