parallel.future.xml

<?xml version="1.0" encoding="utf-8"?>
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<reference xml:id="class.parallel-future" role="class" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xi="http://www.w3.org/2001/XInclude">
 <title>La classe parallel\Future</title>
 <titleabbrev>parallel\Future</titleabbrev>

 <partintro>

  <section>
    <title>Futures</title>
    <para>
     Un Future représente la valeur de retour ou l'exception non attrapée d'une tâche, et expose une API pour l'annulation.
    </para>
     <example>
      <title>Exemple montrant Future comme valeur de retour</title>
      <programlisting role="php">
<![CDATA[
<?php
$runtime = new \parallel\Runtime;
$future  = $runtime->run(function(){
    return "World";
});
printf("Hello %s\n", $future->value());
?>
]]>
      </programlisting>
      &example.outputs.similar;
      <screen>
<![CDATA[
Hello World
]]>
      </screen>
     </example>
    <para>
     Le comportement d'un Future permet également de l'utiliser comme un simple point de synchronisation même si la tâche ne retourne pas explicitement de valeur.
    </para>
     <example>
      <title>Exemple montrant Future comme point de synchronisation</title>
      <programlisting role="php">
<![CDATA[
<?php
$runtime = new \parallel\Runtime;
$future  = $runtime->run(function(){
    echo "in child ";
    for ($i = 0; $i < 500; $i++) {
        if ($i % 10 == 0) {
            echo ".";
        }
    }
    echo " leaving child";
});

$future->value();
echo "\nparent continues\n";
?>
]]>
      </programlisting>
      &example.outputs.similar;
      <screen>
<![CDATA[
in child .................................................. leaving child
parent continues
]]>
      </screen>
     </example>
  </section>

  <section xml:id="parallel-future.synopsis">
   &reftitle.classsynopsis;

<!-- {{{ Synopsis -->
   <classsynopsis>
    <ooclass><classname>parallel\Future</classname></ooclass>

<!-- {{{ Class synopsis -->
    <classsynopsisinfo>
     <ooclass>
      <modifier>final</modifier>
      <classname>parallel\Future</classname>
     </ooclass>
    </classsynopsisinfo>
<!-- }}} -->

    <classsynopsisinfo role="comment">Résolution</classsynopsisinfo>
    <xi:include xpointer="xmlns(db=http://docbook.org/ns/docbook) xpointer(id('class.parallel-future')/db:refentry/db:refsect1[@audience='resolution']/descendant::db:methodsynopsis[not(@role='procedural')])">
     <xi:fallback />
    </xi:include>

    <classsynopsisinfo role="comment">Etats</classsynopsisinfo>
    <xi:include xpointer="xmlns(db=http://docbook.org/ns/docbook) xpointer(id('class.parallel-future')/db:refentry/db:refsect1[@audience='state']/descendant::db:methodsynopsis[not(@role='procedural')])">
     <xi:fallback />
    </xi:include>

    <classsynopsisinfo role="comment">Annulation</classsynopsisinfo>
    <xi:include xpointer="xmlns(db=http://docbook.org/ns/docbook) xpointer(id('class.parallel-future')/db:refentry/db:refsect1[@audience='cancellation']/descendant::db:methodsynopsis[not(@role='procedural')])">
     <xi:fallback />
    </xi:include>

   </classsynopsis>
<!-- }}} -->

  </section>

 </partintro>

 &reference.parallel.parallel.entities.future;

</reference>

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