apd-orders-manager's Introduction
// Boldeanu Ana-Maria // APD - Tema 2 - Manager de comenzi =============================== Descrierea solutiei =============================== Pentru implementarea procesatorului de comenzi, am folosit modelul Replicated Workers cu 2 pooluri: * ordersPool - pentru threadurile de tip OrderTask; * productsPool - pentru threadurile de tip ProductTask. In sursa principala (Tema2.java), creez cei 2 ExecutorService si <nrThreads> threaduri de tip Order. In plus, creez cate un Writer pentru fiecare fisier de output (orders_out.txt si order_products_out.txt), si ii pasez threadurilor create. Fiecare thread de tip OrderTask: - are acces la cele 2 pooluri, la numarul de threaduri active din fiecare pool (AtomicInteger inQueue) si la cei 2 Writeri. - are un id unic (int orderIndex), care coincide cu indexul liniei pe care o va procesa, din fisierul orders.txt. Practic, ajung sa se creeze atatea threaduri Order cate linii sunt in fisier. - citeste fisierul orders.txt pana cand ajunge la linia asignata, de unde isi extrage numele comenzii (String name) si numarul de produse din ea (int nrProducts). - (doar daca nrProducts != 0) creeaza un semafor, pe care il initializeaza cu <1 - nrProducts> permise. Semaforul este folosit pentru a "notifica" angajatul care se ocupa de comanda ca toate produsele din ea au fost livrate. Practic, fiecare thread OrderTask va astepta ca <nrProducts> threaduri ProductTask sa faca semaphore.release(). - (doar daca nrProducts != 0) creeaza un numar de threaduri de tip ProductTask egal cu numarul de produse din comanda respectiva. Practic, fiecare thread ProductTask va cauta al i-lea produs care apartine comenzii. - cand toate threadurile Product pentru comanda respectiva si-au terminat executia, rescrie linia in fisierul de output, adaugand textul "shipped" la final. - adauga in ordersPool un nou thread OrderTask, care se va ocupa de linia cu indexul <orderIndex + nrThreads>. - daca indexul noului OrderTask depaseste numarul de linii din fisier, acesta pur si simplu isi va incheia executia, decrementand contorul ordersInQueue. Fiecare thread de tip ProductTask: - are acces la productsPool si contorul productsInQueue, la obiectul de tip orderTask care l-a creat, la semaforul acestuia si la Writerul aferent. - are un id unic (int productIndex), care coincide cu indexul produsului care trebuie livrat din comanda. - citeste fisierul order_products.txt, cautand produsele care fac parte din comanda sa. Incrementeaza un contor (int foundProducts) pentru fiecare produs gasit, avand scopul de a gasi al i-lea produs (cel care ii este asignat), pentru care scrie "shipped" in fisierul de out. - face semaphore.release() la final, decrementand contorul productsInQueue. ===================================================================================
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