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vert.x
Bartek Zdanowski
TouK
vert.x
Bartek Zdanowski
●developer @ TouK
●co-organizator Confitura
●członek Warszawa JUG
●tata i mąż :)

@BartekZdanowski
vert.x

czym jest vertx?
vert.x
●w czym problem?
rośnie liczba użytkowników mobilnych*
2,1 mld w 2012
7 mld w 2018
rośnie liczba urządzeń inteligentnych
Internet of things - 30 mld do 2020!**
IPv6 czeka na nich!
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

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* http://mobithinking.com/mobile-marketing-tools/latest-mobile-stats/b
** http://en.wikipedia.org/wiki/Internet_of_Things
vert.x
●w czym problem?
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Tomcat - 200 wątków = 200 połączeń
reszta połączeń czeka…
vert.x
●w czym problem?
●1 wątek per zadanie

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jeśli wątek czeka na wynik pracy, stoi cała kolejka
zadań
tradycyjne programowanie synchroniczne
oczekiwanie na wynik (pętla!)
vert.x
●jak można inaczej?

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1 zadanie = seria zdarzeń luźno powiązanych
asynchronicznie
Zostać poinformowanym o danych do przetworzenia
oddać kontrolę do wątku, zamiast czekać na wynik
operacji
vert.x
●jak można inaczej?
trzeba czekać! ale może to robić 1 wątek!

●

zdarzenie

wątek
vert.x
●jak można inaczej?
trzeba czekać! ale może to robić 1 wątek!

●

zdarzenie

reactor

wątek
vert.x
●jak to robi vert.x?
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multi-reactor pattern
pulą wątków równa ilości core’ów
vert.x
●jak to robi vert.x?

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od początku jest asynchroniczny
sterowany zdarzeniowo
rozproszony
skalowalny
bezpieczny wątkowo
używa modelu aktora
vert.x
demo

•
vert.x
●bezpieczna wielowątkowość?
class MyService {
public synchronized Result doSomething(Data data) {
//do some critical stuff
}
}
vert.x
●bezpieczna wielowątkowość?
class MyService {
public synchronized Result doSomething(Data data) {
//do some critical stuff
}
}

1 wątek!

•
vert.x
●bezpieczna wielowątkowość!

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dany verticle uruchmiony zawsze w tym samym wątku
oddzielne classloadery
event bus
shared data: maps, sets
vert.x

Publisher

Publisher - subcriber
publish() //broadcast

EventBus

Subscriber1

Subscriber2
vert.x

Publisher

Publisher - subcriber
send() //point-to-point

EventBus

Subscriber1

Subscriber2
vert.x
●EventBus

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publish - wszyscy
send - jeden, round robin
kolejkowanie
brak potwierdzenia
wiadomości tylko w pamięci - ulotne!
vert.x
●EventBus
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distributed - cluster
sięga klienta przez SockJS
vert.x

Publisher

EventBus

cluster!

Subscriber1

Subscriber2
vert.x
●Jak vert.x się skaluje

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wiele instancji jednego verticle’a
cluster (automagicznie!)
eventbus rozpina się pośród node’ów clustra
wykorzystuje wszystkie core’y
vert.x
●Inne właściwości
Polyglot
Java, JavaScript, CoffeeScript, Ruby, Python,
Groovy + Scala, Clojure i...PHP
Moduły + publiczne repo
Osadzanie vert.x w aplikacji
Server Http + Sockety
Filesystem API
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
vert.x
●Konkurencja?
●node.js! really?!

http://www.cubrid.org/blog/dev-platform/inside-vertx-comparison-with-nodejs/
vert.x
●Konkurencja?
●node.js! really?!

http://www.cubrid.org/blog/dev-platform/inside-vertx-comparison-with-nodejs/
vert.x
●Podsumowanie

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wysoce skalowalny
bezpieczny i wielowątkowy
rozproszony EventBus
wielojęzyczny (polyglot)
gotowy na 2020 - 30 mld urządzeń ;)
vert.x

Demo
vert.x

Dziękuję!

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Vert.x - JDD 2013