Post on 14-Jun-2015
description
El “cajón de sastre” del desarrollo de softwareSeminario
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Agenda
• Motivación
• Apertura del cajón
• Reflexión final
• Ronda de preguntas
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• Motivación• Apertura del cajón
• Reflexión final
• Ronda de preguntas
Agenda
eXce
nti
a : E
l “ca
jón
de
sast
re”
del
des
arro
llo d
e so
ftw
are
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/04
/20
13
eXce
nti
a : E
l “ca
jón
de
sast
re”
del
des
arro
llo d
e so
ftw
are
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/04
/20
13
eXce
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l “ca
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Hacer las cosas bien significa perder el tiempo y dinero
Tener control de calidad es disponer de pruebas funcionales
Falta de empatía con el usuario final
Equipos desmotivados
“Siempre se ha hecho así”
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• Motivación
• Apertura del cajón• Reflexión final
• Ronda de preguntas
Agenda
eXce
nti
a : E
l “ca
jón
de
sast
re”
del
des
arro
llo d
e so
ftw
are
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/04
/20
13
eXce
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a : E
l “ca
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e so
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DEV
…PRO
DEV
DEV
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DEV
…PRO
DEV
DEV
PRE
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DEV
…PRO
DEV
DEV
PRE
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DEV
…PROPRE
DEV
DEV
CIVersionControlSystem
continuousdeployment
continuousdelivery
continuousintegration
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Kent Beck
Martin Fowler
Extremme Programming (XP)
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eXce
nti
a : E
l “ca
jón
de
sast
re”
del
des
arro
llo d
e so
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are
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eXce
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a : E
l “ca
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e so
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TDDRefactor
Red
Green
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Unit Testing ≠ Integration Testing
mock stub
¿Unit Testing?
objetos de simulación
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F.I.R.S.T Principle
Fast
Isolated
Repeateable
Self-validating
Timely
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TDDRefactor
Red
Green
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"Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.“
D.R.Y. PrincipleDon’t Repeat Yourself
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S.O.L.I.D. Principles
Robert C. Martin“Uncle Bob”
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S. O. L. I. D.Single Responsibility Principle
“There should never be more than onereason for a class to change”
public class SuperDashboard extends JFrame {
public Component getLastFocusedComponent()
{...}
public void setLastFocusedComponent(Component lastFocusedComponent)
{...}
public int getMajorVersionNumber ()
{...}
public int getMinorVersionNumber ()
{...}
public int getBuildNumber ()
{...}
}
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S. O. L. I. D.Open-Closed Principle
“Software entities (classes, modules, functions, etc.) shouldbe open for extension, but closed for modification.”
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S. O. L. I. D.Open-Closed Principle
class GraphicEditor {
...
public void drawShape(Shape shape) {
if (shape.type == RECTANGLE)
drawRectangle(shape);
else if (shape.type == CIRCLE)
drawCircle(shape);
}
public void drawCircle(Circle circle)
{....}
public void drawRectangle(Rectangle rectangle)
{....}
}
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S. O. L. I. D.Open-Closed Principle
class Shape {
abstract void draw();
}
class Rectangle extends Shape {
public void draw() {
// draw the rectangle
}
}
class GraphicEditor {
public void drawShape(Shape shape) {
shape.draw();
}
}
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S. O. L. I. D.Liskov Substitution Principle
“Functions that use pointers or references to base classes must be able to use objects of derived
classes without knowing it.”
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13S. O. L. I. D.
class Rectangle {
...
public void setWidth(int width){ this.width = width; }
public void setHeight(int height) {this.height = height;}
public int getWidth(){ return width; }
public int getHeight(){ return height; }
public int getArea(){ return width * height; }
}
class Square extends Rectangle {
public void setWidth(int width){
this.width = width;
this.height = width;
}
public void setHeight(int height){
this.width = height;
this.height = height;
}
}
Liskov Substitution Principle
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class LspTest {
private static Rectangle getNewRectangle() {
...
return new Square();
}
public static void main (String args[]) {
Rectangle r = LspTest.getNewRectangle();
r.setWidth(5);
r.setHeight(10);
System.out.println(r.getArea());
}
}
S. O. L. I. D.Liskov Substitution Principle
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S. O. L. I. D.Interface Segregation Principle
“Clients should not be forced to depend uponinterfaces that they do not use.”
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S. O. L. I. D.Dependency Inversion Principle
“High level modules should not depend upon low level modules. Both should depend upon abstractions.”
“Abstractions should not depend upon details. Details shoulddepend upon abstractions.”
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13S. O. L. I. D.
Dependency Inversion Principle
class Worker {
public void work() {
// ....working
}
}
class Manager {
Worker worker;
public void setWorker(Worker worker) {
this.worker = worker;
}
public void manage() {
worker.work();
}
}
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13S. O. L. I. D.
Dependency Inversion Principleinterface IWorker {
public void work();
}
class Worker implements IWorker {
public void work() { ... }
}
class SuperWorker implements IWorker {
public void work() { ... }
}
class Manager {
Iworker worker;
public void setWorker(IWorker worker) {
this.worker = worker;
}
public void manage() {
worker.work();
}
}
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Martin Fowler
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En el método m de una clase sólo deberían aparecen llamadas a:
• Un método de un miembro de dicha clase
• Otro método de dicha clase
• Un método de un objeto creado por m
• Un método de un objeto pasado como argumento a m
No se debe llamar a métodos de los objetos devueltos por otros métodos.
Law of Demeter (LoD)
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String outputDir = context.getOptions().getDir().getAbsolutePath();
String outputDir = context.getAbsolutePathOfOptionsDir();
…
return options.getAbsolutePathOfDir();
…
…
return directory.getAbsolutePath();
…
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“Aquel que no conoce la historia, está condenado a repetirla “
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¿Dónde te vas de vacaciones?
5 segundos para continuar…
espacio publicitario
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¿Dónde te vas de vacaciones?
5 segundos para continuar…
espacio publicitario
Planifica también tus pruebas
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espacio publicitario
1 segundo para continuar…
Pruebas funcionales automatizadas…
…trátalas con cariño
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Más ideas para conseguir un código legible…
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Código spaghetti
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eXce
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Código ravioli
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// if the item should be deleted
if ((item.amountInStock() == 0) && item.lastEdition())
if (item.shouldBeDeleted())
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int n; // Number of items.
int numberOfItems;
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for (int i = 0; i < 10; i++) {
...
}
for (int i = 0; i < MAX_ARTICLES_IN_STOCK; i++) {
...
}
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Principle of least astonishment (POLA/PLA)
The result of performing some operation should be obvious, consistent, and predictable, based upon the name of the operation and other clues.
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public Space getSpace() {
if (space == null) {
space = new Space();
}
return space;
}
public Space createOrReturnSpace() {
if (space == null) {
space = new Space();
}
return space;
}
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Mutation Testing
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• Motivación
• Apertura del cajón
• Reflexión final• Ronda de preguntas
Agenda
eXce
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"Try and leave this world a little better than you found it . . ."
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The Boy Scout Rule
"Leave the campground cleaner than you found it“
Robert C. Martin“Uncle Bob”
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eXce
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“It seems that perfection is reached not when there is nothing left to add, but when there is nothing left to take away”
Antoine de Saint Exupéry
K.I.S.S. PrincipleKeep It Small and Simple
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eXce
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eXce
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l “ca
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Muévete Lee
Practica Comparte
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Coding Codedojo kata
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eXce
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l “ca
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eXce
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l “ca
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Oath of Non-Allegiance
"I promise not to exclude from consideration any idea based on its source, but to consider ideas across schools and heritages in order to find the ones that best suit the current situation."Alistair Cockburn
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eXce
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l “ca
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eXce
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l “ca
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“Life begins at the end of your comfort zone”
Neal Donald Walsh
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“It is not the strongest of the
species that survives, nor the
most intelligent that survives.
It is the one that is most
adaptable to change.”
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• Motivación
• Apertura del cajón
• Reflexión final
• Ronda de preguntas
Agenda
eXce
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a : E
l “ca
jón
de
sast
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del
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e so
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@excentiawww.excentia.es
Raquel Morenormoreno@excentia.es
Muchas gracias por su atención