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<a href="http://wiki.javaforum.hu/display/~auth.gabor" style="color:#326ca6;text-decoration:none;; color: #326ca6; text-decoration: none">Auth Gábor</a> wrote a blog post:
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<td valign="top" style="font-size: 13px"> <h2 id="email-title-heading" style="font-size: 16px; line-height: 20px; min-height: 20px; margin: 0; padding: 0"> <a href="http://wiki.javaforum.hu/pages/viewpage.action?pageId=25034778" style="color: #326ca6; text-decoration: none"> <img class="icon" src="cid:blogpost-icon" alt="" style="border: 0; padding: 0 2px 0 0; text-align: left" /> <strong style="font-size:16px;line-height:20px;vertical-align:top;">Java7 - Fork és Join</strong> </a> </h2> </td>
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<p style="font-size: 13px">A Java 5 hozott néhány újdonságot a párhuzamos programozás terén, a Java 7 további könnyítéseket tartalmaz, amelyet <a href="http://docs.oracle.com/javase/tutorial/essential/concurrency/forkjoin.html" class="external-link" rel="nofollow" style="color: #326ca6; text-decoration: none">Fork/Join</a> néven találunk meg a dokumentációt böngészve, s három fontos osztály használatát kell csak megtanulnunk:</p>
<ul>
<li style="font-size: 13px"><a href="http://docs.oracle.com/javase/7/docs/api/java/util/concurrent/RecursiveAction.html" class="external-link" rel="nofollow" style="color: #326ca6; text-decoration: none">RecursiveAction</a> – visszatérési érték nélküli feladat</li>
<li style="font-size: 13px"><a href="http://docs.oracle.com/javase/7/docs/api/java/util/concurrent/RecursiveTask.html" class="external-link" rel="nofollow" style="color: #326ca6; text-decoration: none">RecursiveTask</a> – visszatérési értéket adó feladat</li>
<li style="font-size: 13px"><a href="http://docs.oracle.com/javase/7/docs/api/java/util/concurrent/ForkJoinPool.html" class="external-link" rel="nofollow" style="color: #326ca6; text-decoration: none">ForkJoinPool</a> – a szálakat kezelő osztály (thread pool)</li>
</ul>
<p style="font-size: 13px">Az elnevezésekből láthatjuk, hogy alapvetően hosszabb ideig tartó rekurzív feladatokra találták ki ezt a technológiát, mint a fájlrendszer felderítése vagy egy weboldal letöltése, de remekül használható matematikai és/vagy fizikai szimulációkhoz is. A <a href="http://docs.oracle.com/javase/7/docs/api/java/util/concurrent/RecursiveTask.html" class="external-link" rel="nofollow" style="color: #326ca6; text-decoration: none">RecursiveTask</a> dokumentációs oldalán egy tipikus rekurzív feladat: a Fibonacci számsor kiszámolása a példa, nézzük meg közelebbről.</p>
<div class="code panel" style="border-width: 1px;">
<div class="codeHeader panelHeader" style="border-bottom-width: 1px;">
<b>FibonacciTask.java</b>
</div>
<div class="codeContent panelContent">
<pre class="theme: Default; brush: java; gutter: true" style="font-size: 13px">public class Fibonacci extends RecursiveTask<BigInteger>
{
final Integer number;
public Fibonacci(final Integer number)
{
this.number = number;
}
@Override
public BigInteger compute()
{
if (number <= 1)
{
return new BigInteger("" + number);
}
final Fibonacci f1 = new Fibonacci(number - 1);
f1.fork();
final Fibonacci f2 = new Fibonacci(number - 2);
f2.fork();
return f2.join().add(f1.join());
}
}</pre>
</div>
</div>
<p style="font-size: 13px">Két fontos dolgot kell észrevennünk:</p>
<ul>
<li style="font-size: 13px">Az osztály a <em>RecursiveTask</em> osztályból származik és implementálja a <em>compute</em> metódust az átadott <em>BigInteger</em> típus szerint (mivelhogy nagy számokkal dolgozunk).</li>
<li style="font-size: 13px">Létrehozunk két példányt, amelyeket a <em>fork</em> használatával elindításra jelölünk, majd a <em>join</em> hívással várjuk meg az eredményeket.</li>
</ul>
<p style="font-size: 13px">A használatához kell egy új osztály, amely létrehozza a ForkJoinPool példányt, majd elindítja a folyamatot, ezt alább látjuk:</p>
<div class="code panel" style="border-width: 1px;">
<div class="codeHeader panelHeader" style="border-bottom-width: 1px;">
<b>App.java</b>
</div>
<div class="codeContent panelContent">
<pre class="theme: Default; brush: java; gutter: true" style="font-size: 13px">public class App
{
public BigInteger computeFibonacci(Integer number)
{
final Fibonacci fibonacci = new Fibonacci(number);
final ForkJoinPool fjPool = new ForkJoinPool(5);
return fjPool.invoke(fibonacci);
}
public static void main(String[] args)
{
final Integer number = Integer.parseInt(args[0]);
final App app = new App();
System.out.println(app.computeFibonacci(number));
}
}</pre>
</div>
</div>
<p style="font-size: 13px">Ez esetben a lényeg a <em>computeFibonacci</em> metódusban van, ahol létrehozunk egy új <em>Fibonacci</em> osztályt, egy új <em>ForkJoinPool</em> osztályt maximum öt szállal, majd egyszerűen az <em>invoke</em> használatával elindítjuk a többszálú folyamatot. A szálak számáról és a <em>ForkJoinPool</em> gondoskodik, a szálak indításáról és lezárásáról pedig a <em>RecursiveTask</em> ősosztályban megvalósított <em>fork</em> és <em>join</em> metódusok: a fejlesztőnek egyszerűen csak a feladatra kell koncentrálnia, minden mást megold a Java 7.</p>
<p style="font-size: 13px">Megfelelően nagy számmal indítva – az 40 már bőven sok – láthatjuk, hogy egy négymagos (nyolcutas) i7 processzort szépen kiterhel öt szálon az adott java processz:</p>
<div class="code panel" style="border-width: 1px;">
<div class="codeContent panelContent">
<pre class="theme: Default; brush: java; gutter: false" style="font-size: 13px">PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
7268 auth.gab 20 0 1191m 391m 7024 S 495 5.0 8:26.22 java</pre>
</div>
</div>
<p style="font-size: 13px">Ha megnöveljük a használt szálak számát, akkor egészen a processzor végső határig tudjuk növelni a párhuzamosságot:</p>
<div class="code panel" style="border-width: 1px;">
<div class="codeContent panelContent">
<pre class="theme: Default; brush: java; gutter: false" style="font-size: 13px">PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
7442 auth.gab 20 0 1192m 369m 7008 S 736 4.7 1:52.95 java</pre>
</div>
</div>
<p style="font-size: 13px">A kapott eredményt leellenőrizhetjük a <a href="http://www.maths.surrey.ac.uk/hosted-sites/R.Knott/Fibonacci/fibtable.html" class="external-link" rel="nofollow" style="color: #326ca6; text-decoration: none">maths.surrey.ac.uk</a> adott oldalán; 40 esetén ez 102334155 kell legyen.</p>
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<span class="bv_viewracker_span bv_viewtracker_closed"> Page viewed 1 times by 1 users since Jun 12, 2012 </span>
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<td class="bv_viewtracker_body_lastviewed" style="font-size: 13px; border-bottom: 1px solid #bbb; text-align: left; padding: 4px 16px 4px 0">Jun 12, 2012 22:06</td>
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