Gestire l'asincronia in javascript uno sguardo al futuro!
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Uno sguardo alle tecnologie usate fino ad oggi per gestire l'asincronia in javascript e quali saranno le tecnologie in futuro.
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Gestire l'asincronia in javascript uno sguardo al futuro!
- 1. #dotbari
- 3. Gestire l'asincronia in JavaScript uno sguardo al futuro!
- 5. $conn = $db.connect(‘localhost:1234’); $user = $conn.query(‘SELECT . . .’); $user.name = ‘Pippo’; $user.save(); echo(‘salvato’);
- 6. Apache Server t1 Richiesta Creazione di 1 thread
- 7. Apache Server t1 t2 2 richieste Creazione di 2 threads
- 8. Apache Server t1 t2 t3 t4 4 richieste Creazione di 4 threads
- 9. $conn = $db.connect(‘localhost:1234’); $user = $conn.query(‘SELECT . . .’); $user.name = ‘Pippo’; $user.save(); echo(‘salvato’);
- 10. $conn = $db.connect(‘localhost:1234’); $user = $conn.query(‘SELECT . . .’); $user.name = ‘Pippo’; $user.save(); echo(‘salvato’);
- 11. var conn = db.connect(‘localhost:1234’); var user = conn.query(‘SELECT . . .’); user.name = ‘Pippo’; user.save(); console.log(‘salvato’);
- 12. var conn = db.connect(‘localhost:1234’); var user = conn.query(‘SELECT . . .’); user.name = ‘Pippo’; user.save(); console.log(‘salvato’);
- 13. var conn = db.connect(‘localhost:1234’); var user = conn.query(‘SELECT . . .’); user.name = ‘Pippo’; user.save(); console.log(‘salvato’);
- 14. var conn = db.connect(‘localhost:1234’); var user = conn.query(‘SELECT . . .’); user.name = ‘Pippo’; user.save(); console.log(‘salvato’);
- 15. var conn = db.connect(‘localhost:1234’); var user = conn.query(‘SELECT . . .’); user.name = ‘Pippo’; user.save(); console.log(‘salvato’);
- 16. t1 1 richiesta 1 thread
- 17. t1 2 richieste 1 thread
- 18. t1 4 richieste 1 thread
- 19. t1 4 richieste 1 thread
- 20. Node.js
- 21. var conn = db.connect(‘localhost:1234’); var user = conn.query(‘SELECT . . .’); user.name = ‘Pippo’; user.save(); console.log(‘salvato’);
- 23. var conn = db.connect(‘localhost:1234’);
- 24. var conn = db.connect(‘localhost:1234’); db.connect(‘localhost:1234’, function(err,conn){ // async code }); // code code code code
- 25. db.connect(‘localhost:1234’, function(err,conn){ conn.query(‘SELECT...’, function(err,user){ user.name = ‘Pippo’; user.save(function(err){ console.log(‘salvato’); }); }); });
- 26. db.connect(‘localhost:1234’, function(err,conn){ if (err) return console.log(‘errore’); conn.query(‘SELECT...’, function(err,user){ if (err) return console.log(‘errore’); user.name = ‘Pippo’; user.save(function(err){ if (err) return console.log(‘errore’); console.log(‘salvato’); }); }); });
- 28. var conn = db.connect(‘localhost:1234’);
- 29. var conn = db.connect(‘localhost:1234’); var promisedConn = db.connect(‘localhost:1234’); // code code code code promisedConn.then(function(conn){ // async code }); // code code code code
- 30. var conn = db.connect(‘localhost:1234’); var promisedConn = db.connect(‘localhost:1234’); // code code code code promisedConn.then(function(conn){ // async code }).then(function(val){}); // code code code code
- 31. IDEA: chaining
- 32. db.connect(‘localhost:1234’) .then(function(conn){ return conn.query(‘SELECT...’); }).then(function(user){ user.name = ‘Pippo’; return user.save(); }).then(function(){ console.log(‘salvato’); });
- 33. db.connect(‘localhost:1234’) .then(function(conn){ return conn.query(‘SELECT...’); }).then(function(user){ user.name = ‘Pippo’; return user.save(); }).then(function(){ console.log(‘salvato’); }).fail(function(){ console.log(‘errore’); });
- 35. yield
- 36. function count(n){ var res = [] for (var x = 0; x < n; x++) { res.push(x) } return res } for (var x of count(5)) { console.log(x) }
- 37. function* count(n){ for (var x = 0; x < n; x++) { yield x } } for (var x of count(5)) { console.log(x) }
- 38. co(function *(){ var a = yield get('http://google.com'); var b = yield get('http://yahoo.com'); })() co(function *(){ var c = yield get('http://apple.com'); var d = yield get('http://microsoft.com'); })()
- 39. var conn = db.connect(‘localhost:1234’); var user = conn.query(‘SELECT . . .’); user.name = ‘Pippo’; user.save(); console.log(‘salvato’);
- 40. co(function *(){ var conn = yield db.connect(‘localhost:1234’); var user = yield conn.query(‘SELECT . . .’); user.name = ‘Pippo’; yield user.save(); console.log(‘salvato’); })();
- 41. Compatibilita’ 0.11.131 $ node -harmony [filename]
- 42. Compatibilita’
- 43. Compatibilita’
- 44. Grazie per l’ascolto Domande ? ?