211 lines
8.3 KiB
HTML
211 lines
8.3 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<html>
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<head>
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<meta http-equiv="CONTENT-TYPE" content="text/html;
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charset=windows-1252">
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<title></title>
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<meta name="GENERATOR" content="OpenOffice.org 1.1.4 (Win32)">
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<meta name="CREATED" content="20051027;135681">
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<meta name="CHANGEDBY" content="Daniel Hagimont">
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<meta name="CHANGED" content="20051106;19023960">
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<meta name="ProgId" content="FrontPage.Editor.Document">
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<meta name="Template" content="C:\PROGRAM FILES\MICROSOFT
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height:114pt'>
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<v:imagedata src="TP1_fichiers/image001.gif" o:title="logo_inpg"/>
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</v:shape><![endif]-->
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<style>
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<!--
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P { color: #000000 }
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A:link { color: #0000ff }
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A:visited { color: #800080 }
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-->
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</style>
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</head>
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<body dir="ltr" lang="fr-FR" link="#0000ff" text="#000000"
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vlink="#800080">
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<p align="center"><br>
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<b><font style="font-size: 20pt;" size="5">Cours Intergiciels<br>
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</font></b></p>
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<p align="center"><font style="font-size: 20pt;" size="5"><b>ENSEEIHT
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<20> D<>partement Informatique <20> 2i<32>me ann<6E>e</b></font></p>
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<p align="center"><font style="font-size: 20pt;" size="5"><b>TP
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sockets</b></font></p>
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<p style="margin-bottom: 0cm;" align="center"><font size="3">Daniel
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Hagimont</font></p>
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<p style="margin-bottom: 0cm;" align="center"><font size="3">Daniel.Hagimont@enseeiht.fr</font></p>
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<p align="center"><br>
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<br>
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</p>
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<p style="margin-left: 1.27cm; text-indent: -0.64cm;"><a
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name="_Toc432321016"></a> <font face="Arial"><font
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style="font-size: 13pt;" size="3"><b>Objectif</b></font></font></p>
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<p style="margin-left: 1.27cm;">L'objectif de ce TP est l'initiation
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<20> la programmation r<>partie. Il consiste <20> programmer une
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application typique comportant de la r<>partition <20> l'aide de
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Socket. Vous devez implanter un r<>partiteur de charge (<i>Load
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Balancer</i>) qui re<72>oit des requ<71>tes HTTP et les redirige de
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fa<66>on al<61>atoire vers un ensemble de serveurs Web. <br>
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</p>
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<p style="margin-left: 1.27cm;">Le d<>but de cette classe est le
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suivant :<br>
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</p>
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<blockquote>
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<blockquote>
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<p class="western" style="margin-bottom: 0cm" lang="fr-FR"
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align="JUSTIFY"> <font face="Times, serif"><font
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style="font-size: 11pt" size="2"><i>public class
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LoadBalancer {</i></font></font></p>
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<font face="Times, serif"><font style="font-size: 11pt" size="2"><i>static
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String hosts[] = {"localhost", "localhost"};</i></font></font><br>
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<font face="Times, serif"><font style="font-size: 11pt" size="2"><i>static
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int ports[] = {8081,8082};</i></font></font><br>
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<font face="Times, serif"><font style="font-size: 11pt" size="2"><i>static
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int nbHosts = 2;</i></font></font><br>
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<font face="Times, serif"><font style="font-size: 11pt" size="2"><i>static
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Random rand = new Random();</i></font></font><br>
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<font face="Times, serif"><font style="font-size: 11pt" size="2"><i><EFBFBD></i></font></font><br>
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<font face="Times, serif"><font style="font-size: 11pt" size="2"><i>}</i></font></font>
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</blockquote>
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</blockquote>
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<blockquote>
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<p class="western" style="margin-bottom: 0cm" lang="fr-FR"
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align="JUSTIFY"> A chaque r<>ception d'une requ<71>te HTTP (une
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connexion TCP), <i>LoadBalancer</i> transf<73>re la requ<71>te <20> un
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des serveurs web (les adresses de ces serveurs sont donn<6E>es par
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les tables <i>hosts</i> et <i>ports</i>) et <i>LoadBalancer</i>
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transf<73>re le r<>sultat de la requ<71>te <20> l'<27>metteur. Le choix du
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serveur Web est al<61>atoire (<i>rand.nextInt(nbHosts)</i> retourne
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un entier entre 0 et <i>nbHosts-1</i>). Pour <20>tre efficace, <i>LoadBalancer</i>
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est <20>videmment multi-thread<61>.</p>
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<p class="western" style="margin-bottom: 0cm" lang="fr-FR"
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align="JUSTIFY"> <br>
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</p>
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<p class="western" style="margin-bottom: 0cm" lang="fr-FR"
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align="JUSTIFY"> Pour la programmation des entr<74>es/sorties, on
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utilisera :</p>
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</blockquote>
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<ul>
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<ul>
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<p class="western" style="margin-bottom: 0cm" lang="fr-FR"
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align="JUSTIFY"> <font style="font-size: 11pt" size="2"><i>-
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InputStream<br>
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</i></font><font
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size="2"><i></i></font><font style="font-size: 11pt"
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size="2"><i>- public int read(byte[] b); // bloquante,
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retourne le nombre de bytes lus</i></font></p>
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</ul>
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</ul>
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<ul>
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<ul>
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</ul>
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<ul>
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<p class="western" style="margin-bottom: 0cm" lang="fr-FR"
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align="JUSTIFY"> <font style="font-size: 11pt" size="2"><i>-
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OutputStream</i></font><font style="font-size: 11pt"
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size="2"><i><br>
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- public void
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write(byte[] b, int off, int len); // <20>crit les len bytes
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<20> la position off</i></font></p>
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</ul>
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<ul>
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<p class="western" style="margin-right: 0.56cm; margin-bottom:
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0cm; font-style: normal" lang="fr-FR" align="JUSTIFY"> et on
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suppose que les requ<71>tes et r<>ponses sont lues ou <20>crites en
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un seul appel de m<>thode avec un buffer de 1024 bytes. Notez
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que cette hypoth<74>se n'est pas v<>rifie<69>e dans la vrai vie.<br>
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</p>
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</ul>
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</ul>
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<br>
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<p></p>
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<p style="margin-left: 1.27cm; text-indent: -0.64cm;"><a
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name="_Toc432321016"></a> <font size="3"><font face="Arial"><b>Tests</b></font></font></p>
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<p style="margin-left: 1.27cm;"> <br>
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Pour tester, vous disposez d'un petit serveur Web (Comanche.java).<br>
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Vous pouvez en lancer 2 depuis 2 terminaux avec :<br>
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java
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Comanche 8081<br>
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java
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Comanche 8082<br>
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</p>
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<p style="margin-left: 1.27cm;">Lancez votre LoadBalancer sur la
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m<>me machine (il accepte les connexions sur le port 8080).<br>
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</p>
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<p style="margin-left: 1.27cm;">Entrez dans un navigateur (sur la
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m<>me machine) l'URL : localhost:8080/page.html<br>
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(la page page.html est sens<6E>e est pr<70>sente dans le r<>pertoire o<>
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vous avez lanc<6E> Comanche)<br>
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<br>
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</p>
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</body>
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</html>
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