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# Seqüència: Caixer automàtic
<div class="text-end fit-content ms-auto my-3 mt-auto pt-3">
<p><strong>Autor:</strong> Joan Puigcerver Ibáñez</p>
<p><strong>Correu electrònic:</strong> j.puigcerveribanez@edu.gva.es</p>
<p><strong>Curs:</strong> 2024/2025</p>
</div>
<div>
<p class="fw-bold mb-0">Llicència: BY-NC-SA</p>
<p class="d-none d-md-block">(Reconeixement - No Comercial - Compartir Igual)</p>
<a href="https://creativecommons.org/licenses/by-nc-sa/4.0/deed.ca" target="_blank">
<img class="mx-auto" src="/itb/images/license.png" alt="Licence"/>
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## Descripció de l'exemple
Aquest exemple modela la seqüència de les accions que es porten a terme
entre les parts implicades en l'extració de diners d'un caixer automàtic.
## Diagrama
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<figcaption>Diagrama de seqüencia d'un caixer automàtic</figcaption>
1. L'actor o l'usuari que utilitza el caixer ha d'insertar la targeta banària.
2. En aquest moment, el caixer automàtic es connecta amb els servidors del banc per verificar la targeta.
3. El servidor del banc pot __respondre__ de dues maneres: si la targeta és vàlida o no. Depenent de la
resposta del servidor, es realitzaran unes accions o altres.
> Les __respostes__ s'indiquen amb una __fletxa discontínua__.
> Els __possibles camins__ s'han d'indicar mitjançant una __caixa que separa els diferents casos__.
4. _En cas que la targeta siga vàlida_, el caixer automàtic li demana el PIN a l'usuari.
5. _En cas contrari_, el caixer automàtic extrau la targeta.
6. L'usuari introdueix el PIN so·licitat al caixer automàtic.
7. El caixer verifica el PIN en el servidor.
8. Igual que abans, el servidor pot respondre de dues maneres: Que el PIN siga vàlid o no.
9. _En cas que el PIN siga vàlid_, el caixer automàtic li demana la quantitat a extraure a l'usuari.
10. _En cas contrari_, el caixer automàtic extrau la targeta.
11. L'usuari introdueix la quantitat que vol treure del caixer.
12. El caixer comença una transacció.
13. El servidor comprova si hi ha suficient saldo en el compte bancari.
14. Igual que abans, poden haver dos casos: Que hi haja suficient saldo o no.
15. _En cas que hi haja prou saldo_: S'actualizen els diners del compte.
16. Es completa l'actualització.
17. El servidor comunica al caixer que la transacció s'ha completat correctament.
18. El caixer treu el diners.
19. _En cas que no hi haja prou saldo_: El servidor comunica al caixer que no s'ha portat a terme la transacció i no es treuen els diners.
20. Per últim, el caixer expulsa la targeta.
> S'han dibuixat __barres d'activació__ durant el temps que cada element ha estat actiu en aquest procés.