From 636801b890ff84ae25747057e3d2c6074616f16e Mon Sep 17 00:00:00 2001
From: Leandro Lucarella <llucax@gmail.com>
Date: Sat, 11 Oct 2003 02:36:35 +0000
Subject: [PATCH 1/1] Se agregan documentos.

---
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 docs/enunciado/TPf.ht2.gif                  | Bin 0 -> 8943 bytes
 docs/enunciado/TPf.ht3.gif                  | Bin 0 -> 6446 bytes
 docs/enunciado/TPf.ht4.gif                  | Bin 0 -> 10516 bytes
 docs/enunciado/tp.html                      | 257 ++++++++++++++++++++
 docs/oo_callbacks_cpp/default.css           |  30 +++
 docs/oo_callbacks_cpp/logo.gif              | Bin 0 -> 5454 bytes
 docs/oo_callbacks_cpp/oo_callbacks_cpp.html | 197 +++++++++++++++
 8 files changed, 484 insertions(+)
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diff --git a/docs/enunciado/tp.html b/docs/enunciado/tp.html
new file mode 100644
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--- /dev/null
+++ b/docs/enunciado/tp.html
@@ -0,0 +1,257 @@
+<html>
+
+<head>
+<meta http-equiv="Content-Language" content="es-mx">
+
+<title>New Page 1</title>
+</head>
+
+<body>
+
+<h1>Trabajo práctico final</h1>
+<h1>Introducción</h1>
+<p>Diseñar un sistema destinado a la simulación y control de una planta química.</p>
+<p>El sistema consta de 3 aplicaciones independientes destinadas al diseño, 
+simulación y control de la planta, respectivamente. Estas tres aplicaciones se 
+explican a continuación:</p>
+<h1>1 - Diseño de la planta</h1>
+<p>Aplicación Windows, ya sea basada en un diálogo o SDI (Single Document 
+Interface), destinada al diseño de la planta en forma gráfica.</p>
+<p>El sistema debe poder cargar y grabar el diseño de la planta en un archivo de 
+texto.</p>
+<h2>Parte 1 - Modelo de la planta</h2>
+<p>El diseño de la planta debe incluir los siguientes elementos:</p>
+<ul>
+  <li>caños: horizontal, vertical. La longitud de los caños debe poder variarse</li>
+  <li>codos de caños, en todas las 8 direcciones posibles.</li>
+  <li>bifurcaciones de caños</li>
+  <li>uniones de caños</li>
+  <li>tanque</li>
+  <li>bomba (fuente)</li>
+  <li>drenaje (salida)</li>
+  <li>válvula</li>
+</ul>
+<p>El programa debe permitir insertar, borrar y mover cada uno de estos 
+elementos.</p>
+<p>Algunos de estos elementos de la planta tendrán atributos y estados, tal como 
+se detalla en la siguiente tabla:</p>
+<table border="1" cellpadding="0" cellspacing="0" style="border-collapse: collapse" bordercolor="#111111" width="100%" id="AutoNumber1">
+  <tr>
+    <td width="33%"><b><font size="4">Elemento</font></b></td>
+    <td width="33%"><b><font size="4">Atributos</font></b></td>
+    <td width="34%"><b><font size="4">Estados</font></b></td>
+  </tr>
+  <tr>
+    <td width="33%">caños</td>
+    <td width="33%">caudal máximo (litros / seg.)</td>
+    <td width="34%">&nbsp;</td>
+  </tr>
+  <tr>
+    <td width="33%">codos</td>
+    <td width="33%">&nbsp;</td>
+    <td width="34%">&nbsp;</td>
+  </tr>
+  <tr>
+    <td width="33%">bifurcaciones</td>
+    <td width="33%">&nbsp;</td>
+    <td width="34%">&nbsp;</td>
+  </tr>
+  <tr>
+    <td width="33%">uniones</td>
+    <td width="33%">&nbsp;</td>
+    <td width="34%">&nbsp;</td>
+  </tr>
+  <tr>
+    <td width="33%">tanque</td>
+    <td width="33%">capacidad (en litros)</td>
+    <td width="34%">cantidad de litros en el tanque (valor real)</td>
+  </tr>
+  <tr>
+    <td width="33%">bomba</td>
+    <td width="33%">caudal máximo (litros / seg.). Color del líquido.</td>
+    <td width="34%">encendida/apagada (valor binario)</td>
+  </tr>
+  <tr>
+    <td width="33%">drenaje</td>
+    <td width="33%">&nbsp;</td>
+    <td width="34%">&nbsp;</td>
+  </tr>
+  <tr>
+    <td width="33%">válvula</td>
+    <td width="33%">&nbsp;</td>
+    <td width="34%">abierta/cerrada (valor binario)</td>
+  </tr>
+</table>
+<p>Cada elemento del sistema deberá poder asociarse un atributo adicional que 
+será el nombre del objeto</p>
+<p>A continuación se muestra como ejemplo el diseño de una planta.</p>
+<p><img border="0" src="TPf.ht1.gif" width="800" height="559"></p>
+<p>A continuación se muestra el despiece de la planta en los diferentes objetos 
+que la componen.</p>
+<p><img border="0" src="TPf.ht2.gif" width="797" height="547"></p>
+<h2>Parte 2 - Sistema de control</h2>
+<p>Seleccionando alguna opción en la aplicación se debe pasar al diseño del 
+sistema de control de la planta.</p>
+<p>En este modo, no se podrá modificar los objetos que componen la planta, sino 
+que se mostrarán y permitirá modificar los elementos que determinan el control 
+de la misma.</p>
+<p>Como se mencionó anteriormente, algunos objetos pueden tener estados 
+asociados. El programa debe desplegar dos entradas, que permitan modificar dicho 
+estado (abrir/cerrar) y <br>
+una salida que permita leer dicho estado. En el caso del tanque, sólo se tendrán 
+2 salidas que indicarán si el contenido del mismo es superior/inferior a un 
+porcentaje dado.<br>
+<br>
+Estas entradas y salidas deben poder conectarse utilizando un editor gráfico, y 
+debe permitir agregar los símbolos binarios AND y OR, el símbolo unitario 
+NEGADOR, un pulsador y un<br>
+temporizador, tal como se muestra en el diagrama.</p>
+<p><img border="0" src="TPf.ht3.gif" width="451" height="528"></p>
+<p><br>
+Esta lógica debe grabarse en el archivo con la descripción de la planta en 
+formato texto, utilizando la nomenclatura que los alumnos prefieran.</p>
+<h1>2 - Simulación</h1>
+<p>Aplicación de consola, destinada a la simulación de la planta.</p>
+<p>El programa debe cargar una planta de un archivo de texto generada por la 
+aplicación de diseño descripta anteriormente, simular el funcionamiento de la 
+misma y comunicarse con el programa de control para permitir la visualización y 
+control de la planta.</p>
+<p>Todos los parámetros requeridos por esta aplicación deben recibirse por línea 
+de comandos.</p>
+<p>Esta aplicación debe constar de 2 partes o módulos.</p>
+<h2>Módulo Simulación</h2>
+<p>Debe simular el funcionamiento de la planta en base al modelo que se describe 
+en el apéndice I</p>
+<h2>Servidor TCP/IP.</h2>
+<p>Debe implementar la comunicación con una o más aplicaciones de control de la 
+planta.</p>
+<p>El protocolo utilizado para la comunicación debe ser en formato texto, y debe 
+basarse en la filosofía web-services, que se describe a continuación:</p>
+<p>El cliente (aplicación de control) envía un requerimiento al servidor en 
+formato texto (preferentemente XML). Estos requerimientos pueden interpretarse 
+como llamadas a funciones, donde se pasa el nombre de la &quot;funcion&quot; a invocar y 
+sus parámetros. </p>
+<p>El servidor responde con un texto (preferentemente en formato XML).</p>
+<p>Las funciones a implementar deben permitir:</p>
+<p>1 - Obtener una descripción de la planta</p>
+<p>2 - Obtener el estado de un elemento de la planta.</p>
+<p>3 - Modificar el estado de un elemento de la planta</p>
+<h1>3 - Aplicación de control.</h1>
+<p>Aplicación win32 similar a la descripta en el punto 1 y con similar interfaz 
+gráfica. El programa no debe permitir modificar la planta, sino que debe mostrar 
+el estado de la misma.</p>
+<p>Esta aplicación debe mostrar el estado de todos los elementos que componen la 
+planta en forma gráfica, animando cada elemento para indicar los flujos de 
+líquido, con el color correspondiente a cada líquido.</p>
+<p>Si la capacidad máxima de un tanque es superada, el programa debe emitir una 
+alerta.</p>
+<p>El sistema deberá mostrar el contenido de los tanques con el color de los 
+líquidos que lo llenaron.<br>
+&nbsp;</p>
+<h1>Apéndice I - Modelo de simulación</h1>
+<p>La planta puede entenderse como un grafo dirigido, donde cada objeto 
+representa un nodo del grafo y cada caño una arista. Si bien en un caño el 
+líquido puede fluir en ambas direcciones,<br>
+simplificaremos el modelo suponiendo que el liquido fluye en una única 
+dirección.<br>
+<br>
+Los objetos de la planta pueden dividirse en 3 tipos:</p>
+<p>1 - Fuentes. (ejemplo: bomba)<br>
+2 - Drenajes. (ejemplo: salida)<br>
+3 - Los restantes objetos (válvulas, bifurcaciones, uniones, etc) son 
+idealizados suponiendo que no almacenan líquido.</p>
+<p>Un caso particular de dispositivo es el tanque, que constituye una fuente y 
+drenaje al mismo tiempo.</p>
+<p>Para simular la planta, se analizan todos los flujos de liquido entre todas 
+las fuentes y drenajes.</p>
+<p>Las bifurcaciones son simplificadas suponiendo que divide el flujo de líquido 
+en dos.<br>
+Las uniones son simplificadas suponiendo que sólo aceptan el 50% del caudal 
+posible de cada entrada.</p>
+<p>Si una válvula / bomba está cerrada, el programa debe considerar que dicha 
+parte del grafo no está presente.<br>
+<br>
+Ejemplo:</p>
+<p>Tomando el diseño de la planta dado anteriormente, se lo dividirá en un 
+grafo, tal como se muestra a continuación:</p>
+<p><img border="0" src="TPf.ht4.gif" width="827" height="571"></p>
+<p>El sistema deberá iterar n veces por segundo, determinando los caudales en 
+cada arista del grafo. Una vez hecho esto se actualizará los contenidos de 
+líquido en cada tanque en base a los caudales determinados.</p>
+<p>En primer lugar se determinan los posibles caminos fuente-drenaje:</p>
+<p>1 - 4<br>
+3 - 4<br>
+4 - 8<br>
+4 - 10<br>
+8 - 10<br>
+10 - 12</p>
+<p>Una vez hecho esto se determinará el caudal en cada arista, tal como se 
+muestra a continuación:</p>
+<p><b>Flujo en arista 1<br>
+</b>Si la bomba 1 está apagada: 0<br>
+Si la bomba 1 está encendida y la 2 apagada:<br>
+mínimo entre:<br>
+* caudal max. entregado por la bomba<br>
+* caudal max. arista 1<br>
+* caudal máx. arista 3<br>
+Si la bomba 1 y 2 están encendidas:<br>
+* caudal max. entregado por la bomba<br>
+* caudal max. arista 1<br>
+* mitad del caudal máx. arista 3.<br>
+<br>
+<b>Flujo en arista 2<br>
+</b>Similar flujo en arista 1<br>
+<br>
+<b>Flujo en arista 3<br>
+</b>Suma de los flujos por las aristas 1 y 2<br>
+<br>
+<b>Flujo en arista 4<br>
+</b>Si la válvula 5 está cerrada, el flujo será 0.<br>
+En caso contrario:<br>
+Si la bomba 8 está apagada, el grafo se reduce y el flujo estará<br>
+dado por el mínimo caudal entre<br>
+* máximo caudal posible en arista 4<br>
+* máximo caudal posible en arista 5<br>
+* máximo caudal posible en arista 8 por dos, ya que sólo la mitad<br>
+del caudal se irá por esta arista.<br>
+* máximo caudal posible en arista 6 por dos, ya que sólo la mitad<br>
+del caudal se irá por esta arista.<br>
+* máximo caudal posible en arista 9 por dos.<br>
+<br>
+Si la bomba 8 está abierta, el análisis es similar solo que el <br>
+último flujo será directamente:<br>
+* máximo caudal posible en arista 9.<br>
+<br>
+<b>Flujo en arista 5<br>
+</b>Será idéntico al flujo por la arista 4<br>
+<br>
+<b>Flujo en arista 6<br>
+</b>Será la mitad del flujo en la arista 5<br>
+<br>
+<b>Flujo en arista 8<br>
+</b>Será la mitad del flujo en la arista 5<br>
+<br>
+<b>Flujo en arista 9<br>
+</b>Suma de los flujos en aristas 6 y 7<br>
+<br>
+Los restantes flujos pueden ser determinados por los alumnos.<br>
+<br>
+En este análisis no se tuvo en cuenta la existencia de líquido en un tanque. Si 
+un tanque está vacío, debe considerarse que no hay flujo de líquido (válvula 
+cerrada). Si un cuanto de flujo de líquido resulta ser superior al líquido 
+existente en un tanque, dicho caudal deberá ser limitado al caudal existente.</p>
+<p>Una vez determinado el caudal en cada arista del grafo, el programa debe 
+actualizar el contenido de todos los tanques.</p>
+<p>Tener en cuenta que cada bomba de la planta entrega líquidos de distinto tipo 
+(color) lo cual deberá ser tenido en cuenta al actualizar los volúmenes de cada 
+tanque, de tal forma que el color mostrado en el grafo sea proporcional (en 
+forma aproximada) a la densidad de los líquidos entrantes.</p>
+<p>Por ejemplo:</p>
+<p>Si un tanque contiene 10 litros de líquido rojo (255,0,0) y recibe 10 litros 
+de líquido de verde (0,255,0), el color resultante será:</p>
+<p>(255 * 90 / 100, 255 * 10 / 100, 0)</p>
+<p>Utilizar números double para minimizar errores de redondeo.</p>
+
+</body>
+
+</html>
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diff --git a/docs/oo_callbacks_cpp/oo_callbacks_cpp.html b/docs/oo_callbacks_cpp/oo_callbacks_cpp.html
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+<H1 class=s1>Callbacks in C++: The OO Way</H1>
+<DIV class=toc>
+<H2 class=s2 id=N1698364>Content</H2>
+<OL>
+  <LI><A href="http://cscene.org/topics/misc/cs7-04.xml.html#N7895983">What are 
+  Callbacks?</A>
+  <LI><A href="http://cscene.org/topics/misc/cs7-04.xml.html#N310499">A simple 
+  Thread class</A>
+  <LI><A href="http://cscene.org/topics/misc/cs7-04.xml.html#N7751758">Thread 
+  implementation</A>
+  <LI><A href="http://cscene.org/topics/misc/cs7-04.xml.html#N3038356">A real 
+  Thread class</A></LI></OL></DIV>
+<DIV class=article>
+<P>by <I>Jürgen Hermann</I><BR>last updated <I>2001/08/02</I> (version 
+<I>1.1.1.1</I>)<BR>also available as <A 
+href="http://cscene.org/topics/misc/cs7-04.xml.txt">XML</A></P>
+<DIV class=s2>
+<H2 class=s2 id=N7895983>What are Callbacks?</H2>
+<P>Many operating systems and other subsystems (like GUI libraries) feature a 
+special type of hook into those systems, named callbacks or callback functions. 
+Upon initialization or by calling an API function you pass pointers to the 
+callback into the subsystem, for later use. The problem with those functions is, 
+since these subsystems are nowadays not yet OO, that they have no notion of what 
+an object is. So if you want to have a <EM>callback object&nbsp;</EM> instead of 
+a mere function, some OO magic is called for.</P>
+<P>As an example, consider the <CODE>BeginThread</CODE> API that many OSes have 
+in a quite similar form; we assume that it takes a pointer to the function that 
+provides the actual code for the newly created thread plus a <EM>data 
+pointer&nbsp;</EM> that is passed to that function as a startup parameter. Thus, 
+we end up with <CODE>BeginThread (void (*thread_func) (void*), void* 
+startup_data)</CODE>. Now let's make a <CODE>Thread</CODE> class of 
+that.</P></DIV>
+<DIV class=s2>
+<H2 class=s2 id=N310499>A simple Thread class</H2>
+<P>What we want to have is an ABC (abstract base class) that you can inherit 
+from, creating specialized thread classes and in turn thread objects (i.e. 
+actual threads). The code of the thread is located in a <EM>pure 
+virtual&nbsp;</EM> function <CODE>code</CODE> that is provided by the inherited 
+class. <CODE>code</CODE> is then similar to the <CODE>thread_func</CODE> 
+parameter of the <CODE>BeginThread</CODE> call, but is a full-blown member 
+function, not just a C function. So, we get this interface for the 
+<CODE>Thread</CODE> class:</P><PRE class=source>class Thread {
+public:
+    virtual ~Thread();
+    void run();
+
+protected:
+    Thread();
+    virtual void code() = 0;
+
+private:
+    int running;
+
+    static void dispatch(void* thread_obj);
+};
+</PRE>
+<P>This might seem quite unusual to you (like having a protected constructor), 
+but things will be explained in due course.</P></DIV>
+<DIV class=s2>
+<H2 class=s2 id=N7751758>Thread implementation</H2>
+<P>When we put the thread concept into a class, we have to consider lifetime. A 
+thread exists as long as the thread function does not return, thus the object 
+has to have the same lifetime. Because of this, an <CODE>auto</CODE> thread 
+object does not make much sense; we insure that every thread object exists on 
+the heap by making the ctor protected and providing a static factory method 
+<CODE>create</CODE> for thread objects in each derived class:</P><PRE class=source>Thread::Thread() 
+    : running(0) 
+{
+}
+
+DerivedThread&amp; DerivedThread::create()
+{
+    return *new DerivedThread;
+}
+</PRE>
+<P><CODE>create</CODE> has to be added to every inherited class, returning an 
+object of that class.</P>
+<P>Next, we need a <CODE>run</CODE> method that actually starts the thread. This 
+can't be done in the ctor: when <CODE>code</CODE> would be registered as a 
+thread of execution in the <EM>base class&nbsp;</EM> ctor, the superclass would 
+not yet be fully created and calling <CODE>code</CODE> would be quite invalid 
+and dangerous. <CODE>run</CODE> does its job by registering the 
+<CODE>dispatch</CODE> function as a thread, giving that thread the object 
+pointer as a startup parameter; since <CODE>dispatch</CODE> is static, it has a 
+prototype that matches the <CODE>void(*)(void*)</CODE> parameter of 
+<CODE>BeginThread</CODE>.</P><PRE class=source>void Thread::run()
+{
+    // Don't start two threads on the same object
+    if (running) return;
+
+    // Create an OS thread, using the static callback
+    BeginThread(Thread::dispatch, this);
+    running = 1;
+}
+</PRE>
+<P>So finally, <CODE>dispatch</CODE> is called and performs the step from a 
+procedural callback to the callback object:</P><PRE class=source>void Thread::dispatch(void* thread_obj)
+{
+    // Call the actual OO thread code
+    ((Thread*)thread_obj)-&gt;code();
+
+    // After code() returns, kill the thread object
+    delete (Thread*)thread_obj;
+}
+</PRE></DIV>
+<DIV class=s2>
+<H2 class=s2 id=N3038356>A real Thread class</H2>
+<P>A real-world thread class has to consider a few things we have ignored here. 
+These things include: </P>
+<OL class=userlist>
+  <LI>more access to the thread data, like a method giving the thread ID. 
+  <LI>a method for killing the thread, including the deletion of the thread 
+  object. </LI></OL>
+<P>Developed and tested on Windows NT, this is the <A 
+href="http://cscene.org/archives/callback.cpp.txt">source</A> for a little 
+example program that implements the above in the real world. If you run it, you 
+get something similar to the following output:</P><PRE class=source>[\cscene\callback]callback
+Started thread #80 for dice1
+Started thread #84 for dice2
+dice1 rolled 1
+dice2 rolled 1
+dice2 rolled 3
+dice1 rolled 1
+dice2 rolled 4
+dice1 rolled 6
+dice1 rolled 3
+dice2 rolled 3
+dice1 rolled 1
+dice1 rolled 4
+dice2 rolled 4
+dice2 rolled 3
+dice1 rolled 1
+dice2 rolled 6
+dice1 rolled 2
+dice2 rolled 2
+dice1 rolled 1
+dice2 rolled 4
+dice2 rolled 1
+dice1 rolled 4
+dice1 rolled 5
+dice2 rolled 1
+dice1 rolled 3
+dice2 rolled 3
+dice1 rolled 2
+dice1 rolled 6
+dice2 rolled 2
+dice1 rolled 1
+dice2 rolled 3
+dice1 rolled 4
+dice1 rolled 5
+dice2 rolled 3
+dice2 rolled 6
+dice1 rolled 4
+</PRE>
+<P>Have fun!</P></DIV>
+<P><SMALL><EM>This article is Copyright © 1997-98 by Jürgen Hermann<BR>and 
+Copyright © 1999 by C-Scene. All Rights Reserved. </EM></SMALL></P></DIV>
+<DIV class=lastwords>
+<HR>
+Copyright © 1997-2000 by C-Scene. All Rights Reserved.<BR><BR>Part of the 
+graphics and stylesheets used to generate this site are<BR>Copyright © 1999-2000 
+by Apache Software Foundation. </DIV></BODY></HTML>
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