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Copyright © 2018 TIS Inc. All rights reserved.
Akka in Action workshop
Scala Matsuri 2018
Yugo Maede
@yugolf
The preparation for this workshop.
https://github.com/akka-ja/akka-in-action/tree/matsuri/chapter-up-and-running#the-preparation
Copyright © 2018 TIS Inc. All rights reserved. 2
Who am I?
Yugo Maede @yugolf
TIS Inc.
research and development using Akka, Scala and others
Translated
Akkaを使ったシステム開発や研究活動をやっています。
仲間募集開始!!
We are recruiting colleagues to
work together with us.
Copyright © 2018 TIS Inc. All rights reserved. 3
TISカジュアルはじめました
2018.3.1
TIS casual has started!
We are hiring!
Copyright © 2018 TIS Inc. All rights reserved. 4
Todayʼs Topics
Building a minimal Akka app
The first step for Akka
• How to implement Apps by using Akka
• How to study Akka for the future
Akkaで最⼩のアプリケーションを構築する
 Akkaを使った実装の取っ掛かりに
Copyright © 2018 TIS Inc. All rights reserved. 5
Material
教材は『Akka実践バイブル』
✦here
Copyright © 2018 TIS Inc. All rights reserved. 6
Akka in Action
『Akka実践バイブル』の内容
Appendix. Using Akka from Java
https://www.manning.com/books/akka-in-action
Copyright © 2018 TIS Inc. All rights reserved. 7
Agenda
• Introduction
• Chapter1. Introducing Akka
• Chapter2. Up and running
• Fetching a project template
• Building a minimal Akka app for the cloud
4 exercises
• Deploying to Heroku
• Conclusion
アジェンダ
Copyright © 2018 TIS Inc. All rights reserved.
Chapter 1. Introducing Akka
8
第1章 Akkaの紹介
Copyright © 2018 TIS Inc. All rights reserved. 9
Chapter 1. Introducing Akka
Akkaとは/概要/従来型との違い/アクターのプログ
ラミングモデル/Akkaのアクター
1.1. What is Akka?
1.2. Actors: a quick overview
1.3. Two approaches to scaling: setting up our example
1.4. Traditional scaling
1.5. Scaling with Akka
1.6. Actors: one programming model to rule up and out
1.7. Akka actors
Copyright © 2018 TIS Inc. All rights reserved. 10
What is Akka?
Akkaは並⾏・分散アプリケーションのためのツール
キット
•The toolkit for concurrent and distributed
applications
•scale applications both up
and out on the JVM
•keep the complexity
relatively low while an
application scales
Copyright © 2018 TIS Inc. All rights reserved. 11
Actors: a quick overview
アクターからアクターへメッセージを送信、受信した
メッセージを到着順に処理
User
Actor processes messages
in order of arrival
TicketSeller
Buy
Buy
Buy
mailbox
ticketSeller ! Buy(tickets)
Copyright © 2018 TIS Inc. All rights reserved. 12
Traditional scaling and Akka scaling
アクターと伝統的なアプローチの⽐較
• Traditional • Akka
Copyright © 2018 TIS Inc. All rights reserved. 13
Traditional scaling and Akka scaling
ゴール:データは永続性あるものに、機能はインタラク
ティブに、サービスは疎結合に、そして障害に強く
Goal Traditional	approach Akka	approach	
Make	data	durable,	
even	if	the	
application	restarts	
or	crashes.
Use	the	database	as	
one	big	shared	
mutable	state.
Continue	to	use	in-memory	
state.	Changes	to	the	state	
are	sent	as	messages	to	a	
log.	
Provide	interactive	
features
Poll	the	database,	
even	if	there’s	no	
change	in	the	data.
Push	events	to	interested	
parties,	only	when	there’s	
a	significant	event.
Decoupling	of	services Add	a	message	queue	
for	asynchronous	
processing.
No	need	to	add	a	message	
queue;	actors	are	
asynchronous	by	definition.
Prevent	failure	of	the	
total	system	when	
critical	services	fail	
predicting	all	
failure	scenarios	and	
catching	exceptions.
no	impact	on	the	stability	
of	the	other	components.
Copyright © 2018 TIS Inc. All rights reserved. 14
Actors: one programming model to rule up and out
単⼀のプログラミングモデルでスケールアップとスケー
ルアウトを実現
The	actor	model	decouples	from	the	number	of	threads	or	the	
number	of	servers.
Copyright © 2018 TIS Inc. All rights reserved. 15
Akka actors: Actor System
Akkaのアクターはアクターシステムを作成することか
ら
https://doc.akka.io/docs/akka/2.5/general/supervision.html
val system = ActorSystem("TeamChat")
Copyright © 2018 TIS Inc. All rights reserved. 16
Akka actors: ActorRef and Mailbox and Actor
ActorRefに到着したメッセージは⼀時的にメールボッ
クスに保存し到着順に処理する
Copyright © 2018 TIS Inc. All rights reserved.
Chapter 2. Up and running
17
第2章 最⼩のAkkaアプリケーション
Copyright © 2018 TIS Inc. All rights reserved.
Chapter 2. Up and running
18
•Fetching a project template
•Building a minimal Akka app for the cloud
•Deploying to Heroku
第2章 最⼩のAkkaアプリケーション
• プロジェクトテンプレートの取得
Copyright © 2018 TIS Inc. All rights reserved. 19
Fetching a project template
Gitからプロジェクトを取得してアプリケーションを実⾏
• Clone	the	example	project	from	github.com
$git	clone	https://github.com/akka-ja/akka-in-action.git
$cd	akka-in-action/chapter-up-and-running/	
$sbt	run
https://github.com/akka-ja/akka-in-action/tree/matsuri/chapter-up-and-running#the-commands-using-this-workshop
• Start	the	app
[info]	Running	com.goticks.Main	
INFO		[Slf4jLogger]:	Slf4jLogger	started	
INFO		[go-ticks]:	RestApi	bound	to	/0:0:0:0:0:0:0:0:5000	
INFO		[go-ticks]:	Success	to	bind	to	0.0.0.0:5000
Copyright © 2018 TIS Inc. All rights reserved. 20
The structure of the project
プロジェクトの構造
configuration	files	and	other	resources
source	codes
test	codes
built	files
for	building	by	sbt
for	executing	on	Heroku
https://www.jetbrains.com/idea/download/
Copyright © 2018 TIS Inc. All rights reserved. 21
Ticket-selling service
チケット販売サービス
イベント作成/キャンセル/⼀覧取得/チケット購⼊
• Get	all	events	
• Buy	tickets
• Create	an	event	
• Cancel	an	event
Ticket-selling	
service
Copyright © 2018 TIS Inc. All rights reserved. 22
Letʼs run the app
まずは、動かしてみましょう!
HTTPリクエストのツールをインストールしてアプリを起動
• Prepare	for	executing	http	requests	
• install	HTTPie	or	Advanced	REST	client		
- CLI:	HTTPie	(https://httpie.org/)	
- GUI:	Advanced	REST	client(Chrome	Extensions)	
https://chrome.google.com/webstore/detail/advanced-rest-
client/hgmloofddffdnphfgcellkdfbfbjeloo
$brew	install	httpie
Copyright © 2018 TIS Inc. All rights reserved. 23
How to use HTTPie
HTTPieを使ったHTTPリクエストの送信⽅法
• CLI:	HTTPie	
$http	POST	localhost:5000/events/RHCP	tickets:=10	
HTTP/1.1	201	Created	
Content-Length:	28	
Content-Type:	application/json	
Date:	Sat,	10	Mar	2018	09:27:25	GMT	
Server:	GoTicks.com	REST	API	
{	
				"name":	"RHCP",	
				"tickets":	10	
}
Copyright © 2018 TIS Inc. All rights reserved. 24
How to use REST client
Advanced REST clientを使ったリクエストの送信⽅法
• GUI:	Advanced	REST	client(Chrome	Extensions)	
(1) (2)
(3)
(4)
(8)
http://localhost:5000/events/RHCP
(5)
(6)
(7)
{"tickets":10}
Copyright © 2018 TIS Inc. All rights reserved. 25
How to send 4 types of HTTP requests
4つのHTTPリクエストの送信⽅法
• Create	an	event	
• Get	all	events	
• Buy	tickets	
• Cancel	an	event	
$http	POST	localhost:5000/events/RHCP	tickets:=10
$http	GET	localhost:5000/events
$http	POST	localhost:5000/events/RHCP/tickets	tickets:=2
$http	DELETE	localhost:5000/events/RHCP/
Copyright © 2018 TIS Inc. All rights reserved. 26
イベントの作成、参照、購⼊、、、キャンセル、、、
	>get	all	events	
	>buy	2	“RHCP”	tickets	
	>get	all	events	
	>buy	8	“RHCP”	tickets	
	>buy	2	“RHCP”	tickets
> create	“RHCP”	event	with	10	tickets	
> create	“ScalaMatsuri”	event	with	20	tickets
> cancel	“ScalaMatsuri”
> get	all	events
Letʼs run the app
Copyright © 2018 TIS Inc. All rights reserved.
Chapter 2. Up and running
27
•Fetching a project template
•Building a minimal Akka app for the cloud
•Deploying to Heroku
第2章 最⼩のAkkaアプリケーション
• 最⼩のAkkaアプリケーションをクラウドに構築
Copyright © 2018 TIS Inc. All rights reserved. 28
Fetching a project template for workshop
ワークショップ⽤ブランチの取得
$ git	checkout	matsuri
Copyright © 2018 TIS Inc. All rights reserved.
ActorSystem	
“go-ticks”
29
The structure of the application
アプリケーションの構造
Main
HTTP	Server
HTTP	Route	
RestApi
Actor	
BoxOffice
Actor	
TicketSeller
run
new
create
create
create
Copyright © 2018 TIS Inc. All rights reserved. 30
The structure of the Actors
アクターの構造
 チケット売り場とチケット販売員
RHCP
Scala	
Matsuri
boxOffice
create
Add/Buy/Cancel/…
Actor	
BoxOffice
Actor	
TicketSeller
Copyright © 2018 TIS Inc. All rights reserved.
Exercise 0. Create ActorSystem
31
演習0.アクターシステムの⽣成
Copyright © 2018 TIS Inc. All rights reserved.
ActorSystem	
“go-ticks”
32
Create ActorSystem
アクターシステムの⽣成
Main
HTTP	Server
HTTP	Route	
RestApi
Actor	
BoxOffice
Actor	
TicketSeller
run
new
create
create
create
Copyright © 2018 TIS Inc. All rights reserved. 33
Create “go-ticks” ActorSystem
ActorSystem「go-ticks」の⽣成
0.0.[Main]	create	ActorSystem	
Run	the	App
implicit val system = ActorSystem(“go-ticks”)
$ sbt	run	
...	
[info]	Running	com.goticks.Main	
INFO		[Slf4jLogger]:	Slf4jLogger	started	
INFO		[go-ticks]:	RestApi	bound	to	/0:0:0:0:0:0:0:0:5000	
INFO		[go-ticks]:	Success	to	bind	to	0.0.0.0:5000
Copyright © 2018 TIS Inc. All rights reserved.
Exercise 1. Create an event
34
演習1.イベントの作成
Copyright © 2018 TIS Inc. All rights reserved. 35
HTTP	Route	
RestApi
Actor	
BoxOffice
Actor	
TicketSeller
CreateEvent
create
EventCreated
EventExists
POST	
/events/RHCP
Created	201	
BadRequest	400
Add
イベントを作成するフロー
The flow of creating an event
Copyright © 2018 TIS Inc. All rights reserved. 36
The flow of creating an event: implement points
実装するところ
Actorの⽣成とメッセージ送信(Add/ EventCreated)
HTTP	Route	
RestApi
Actor	
BoxOffice
Actor	
TicketSeller
CreateEvent
create
AddEventCreated
EventExists
POST	
/events/RHCP
Created	201	
BadRequest	400
Copyright © 2018 TIS Inc. All rights reserved. 37
Exercise 1: Define and create Actors and send messages
演習1:TicketSellerアクターの⽣成、Addメッセージ
の送信、EventCreatedメッセージの返信
• Create	TicketSeller	actor	
1.1.[TicketSeller]	define	actor	factory	method	
1.2.[BoxOffice			]	create	TicketSeller	actor	
• Send	Add	message	from	BoxOffice	to	TicketSeller	
1.3.[TicketSeller]	define	message	protocol	
1.4.[TicketSeller]	behavior	when	receive	messages	
1.5.[BoxOffice			]	send	Add	message	
• Return	EventCreated	message	from	BoxOffice	to	RestApi	
1.6.[BoxOffice			]	return	EventCreated	message
Copyright © 2018 TIS Inc. All rights reserved. 38
Exercise 1: Run the app
イベント作成の動作確認
Run	the	app
$cd	akka-in-action/chapter-up-and-running/	
$sbt	run	
...	
INFO		[Slf4jLogger]:	Slf4jLogger	started	
INFO		[go-ticks]:	RestApi	bound	to	/0:0:0:0:0:0:0:0:5000	
INFO		[go-ticks]:	Success	to	bind	to	0.0.0.0:5000
Send	a	HTTP	request
$http	POST	localhost:5000/events/RHCP	tickets:=10	
HTTP/1.1	201	Created	
...	
{	
				"name":	"RHCP",	
				"tickets":	10	
}
Copyright © 2018 TIS Inc. All rights reserved. 39
Create TicketSeller actor
TicketSellerアクターの⽣成
1.1.[TicketSeller]	define	actor	factory	method	
1.2.[BoxOffice			]	create	TicketSeller	actor	
object TicketSeller {
def props(event: String) = Props(new TicketSeller(event))
}
class BoxOffice(implicit timeout: Timeout) extends Actor {
...
def createTicketSeller(name: String) =
context.actorOf(TicketSeller.props(name), name)
def receive = {
case CreateEvent(name, tickets) =>
def create() = {
val eventTickets = createTicketSeller(name)
...
}
context.child(name).fold(create())(_ => sender() ! EventExists)
}
BoxOffice TicketSeller
create
Copyright © 2018 TIS Inc. All rights reserved. 40
Send Add message from BoxOffice to TicketSeller
Addメッセージの送信(BoxOffice->TicketSeller)
1.3.[TicketSeller]	define	message	protocol	
1.4.[TicketSeller]	behavior	when	receive	messages	
1.5.[BoxOffice			]	send	Add	message	
object TicketSeller {
case class Add(tickets: Vector[Ticket])
}
class BoxOffice(implicit timeout: Timeout) extends Actor {
...
def receive = {
case CreateEvent(name, tickets) =>
def create() = {
...
eventTickets ! TicketSeller.Add(newTickets)
}
context.child(name).fold(create())(_ => sender() ! EventExists)
class TicketSeller(event: String) extends Actor {
import TicketSeller._
var tickets = Vector.empty[Ticket]
def receive = {
case Add(newTickets) => tickets = tickets ++ newTickets
}
BoxOffice TicketSeller
Add
Copyright © 2018 TIS Inc. All rights reserved. 41
Return EventCreated message from BoxOffice to RestApi
EventCreatedメッセージの返信(RestApi<-BoxOffice)
1.6.[BoxOffice			]	return	EventCreated	message
class BoxOffice(implicit timeout: Timeout) extends Actor {
...
def receive = {
case CreateEvent(name, tickets) =>
def create() = {
...
eventTickets ! TicketSeller.Add(newTickets)
sender() ! EventCreated(Event(name, tickets))
}
context.child(name).fold(create())(_ => sender() ! EventExists)
}
RestApi BoxOffice
EventCreated
Copyright © 2018 TIS Inc. All rights reserved. 42
Exercise 1: learned
アクターの⽣成、メッセージ送信、メッセージプロトコ
ルの定義、メッセージを受信したときのふるまい
• create	Actor
• send	messages
• behavior	when	receive	messages
• define	message	protocol
context.actorOf(TicketSeller.props(name), name)
eventTickets ! TicketSeller.Add(newTickets)
object TicketSeller {
case class Add(tickets: Vector[Ticket])
}
class BoxOffice(implicit timeout: Timeout) extends Actor {
def receive = {
case Add(newTickets) => ...
object TicketSeller {
def props(event: String) = Props(new TicketSeller(event))
}
Copyright © 2018 TIS Inc. All rights reserved.
Exercise 2. Buy tickets
演習2.チケットの購⼊
Copyright © 2018 TIS Inc. All rights reserved. 44
The flow of buying tickets
チケットを購⼊するフロー
GetTicketsPOST	
/events/RHCP/tickets
Created	201	
NotFound	404
HTTP	Route	
RestApi
Actor	
BoxOffice
Actor	
TicketSeller
Buy
Tickets
Copyright © 2018 TIS Inc. All rights reserved. 45
GetTickets
Buy
Tickets
POST	
/events/RHCP/tickets
Created	201	
NotFound	404
HTTP	Route	
RestApi
Actor	
BoxOffice
Actor	
TicketSeller
実装するところ
メッセージ送信(Buy/ Tickets)
The flow of buying tickets: implement points
Copyright © 2018 TIS Inc. All rights reserved. 46
Exercise 2: Send Buy message and return Tickets message
演習2:Buyメッセージを送信して、Ticketsメッセー
ジを返信する
• Send	Buy	message	from	BoxOffice	to	TicketSeller	
2.1.[TicketSeller]	define	message	protocol	
2.2.[TicketSeller]	behavior	when	receive	messages	
- return	Tickets	message	
2.3.[BoxOffice			]	forward	Buy	message
Copyright © 2018 TIS Inc. All rights reserved. 47
チケット購⼊の動作確認
$sbt	run
$http	POST	localhost:5000/events/RHCP	tickets:=10	
...	
$http	POST	localhost:5000/events/RHCP/tickets	tickets:=2	
HTTP/1.1	201	Created	
...	
{	
				"entries":	[	
								{	
												"id":	1	
								},	
								{	
												"id":	2	
								}	
				],	
				"event":	"RHCP"	
}
Exercise 2: Run the app
Run	the	app
Send	a	HTTP	request
Copyright © 2018 TIS Inc. All rights reserved. 48
Send	Buy	message	from	BoxOffice	to	TicketSeller
送信元アクターに直接返信させるためforwardする
2.1.[TicketSeller]	define	message	protocol	
2.2.[TicketSeller]	behavior	when	receive	messages	
- return	Tickets	message	
2.3.[BoxOffice			]	forward	Buy	message
object TicketSeller {
case class Buy(tickets: Int)
case class Tickets(event: String, entries: Vector[Ticket] = Vector.empty[Ticket])
class TicketSeller(event: String) extends Actor {
def receive = {
case Buy(nrOfTickets) =>
val entries = tickets.take(nrOfTickets)
if(entries.size >= nrOfTickets) {
sender() ! Tickets(event, entries)
tickets = tickets.drop(nrOfTickets)
} else sender() ! Tickets(event)
def receive = {
case GetTickets(event, tickets) =>
...
def buy(child: ActorRef) = child.forward(TicketSeller.Buy(tickets))
BoxOffice TicketSeller
Buy
BoxOffice
Tickets
Copyright © 2018 TIS Inc. All rights reserved. 49
Exercise 2: learned
メッセージの転送
• forward	message
child.forward(TicketSeller.Buy(tickets))
Copyright © 2018 TIS Inc. All rights reserved.
Exercise 3. Get all events
50
演習3.イベント⼀覧の取得
Copyright © 2018 TIS Inc. All rights reserved. 51
The flow of getting all events
イベント⼀覧を取得するフロー
GetEventsGET	
/events/
OK	200	Events
HTTP	Route	
RestApi
Actor	
BoxOffice
Actor	
TicketSeller
GetEvent
None
GetEvent
Event
Events
Copyright © 2018 TIS Inc. All rights reserved. 52
GetEvents
GetEvent
Event
GET	
/events/
OK	200	Events
GetEvent
None
Events
HTTP	Route	
RestApi
Actor	
BoxOffice
Actor	
TicketSeller
The flow of getting all events: implement points
実装するところ
メッセージ送信(GetEvent/ None/ Event/ Events)
Copyright © 2018 TIS Inc. All rights reserved. 53
Exercise 3: Send GetEvent message and return Event message
• Return	Event	
3.1.[TicketSeller]	defines	message	protocol	
3.2.[TicketSeller]	behavior	when	receive	messages	
- return	Event	message	
• Send	GetEvent	message	from	BoxOffice	to	self	
3.3.[BoxOffice			]	sends	GetEvent	message	to	self	
• Define	behavior	when	receive	GetEvent	message	
3.4.[BoxOffice			]	doesn’t	find	a	child	actor:	
- return	None	message	
3.5.[BoxOffice			]	finds	a	child	actor:	
- forward	GetEvent	message	
• Return	Events	message	
3.6.[BoxOffice			]	returns	Events	message	to	sender
演習3:GetEventメッセージを送信して、Eventメッ
セージを返信する
Copyright © 2018 TIS Inc. All rights reserved. 54
Exercise 3: Run the app
チケット⼀覧取得の動作確認
$sbt	run
$http	POST	localhost:5000/events/RHCP	tickets:=10	
...	
$http	POST	localhost:5000/events/RHCP/tickets	tickets:=2	
...	
$http	GET	localhost:5000/events/	
HTTP/1.1	200	OK	
...	
{	
				"events":	[	
								{	
												"name":	"RHCP",	
												"tickets":	8	
								}	
				]	
}
Run	the	app
Send	a	HTTP	request
Copyright © 2018 TIS Inc. All rights reserved. 55
Return Event
3.1.[TicketSeller]	defines	message	protocol	
3.2.[TicketSeller]	behavior	when	receive	messages	
- return	Event	message
class TicketSeller(event: String) extends Actor {
def receive = {
...
case GetEvent => sender() ! Some(BoxOffice.Event(event, tickets.size))
object TicketSeller {
case object GetEvent
}
GetEventメッセージを受信したら、Eventメッセージ
を返す
BoxOffice TicketSeller
Event
Copyright © 2018 TIS Inc. All rights reserved. 56
Send GetEvent message from BoxOffice to self
GetEventメッセージを⾃⾝(self)に送信する
3.3.[BoxOffice			]	sends	GetEvent	message	to	self	
class BoxOffice(implicit timeout: Timeout) extends Actor {
...
def receive = {
...
case GetEvents =>
import akka.pattern.ask
def getEvents = context.children.map { child =>
self.ask(GetEvent(child.path.name)).mapTo[Option[Event]]
}
BoxOffice
GetEvent
Copyright © 2018 TIS Inc. All rights reserved. 57
Define behavior when receive GetEvent message
GetEventメッセージを受信したときのふるまい
3.4.[BoxOffice			]	doesn’t	find	a	child	actor:	
- return	None	message	
3.5.[BoxOffice			]	finds	a	child	actor:	
- forward	GetEvent	message	
class BoxOffice(implicit timeout: Timeout) extends Actor {
...
def receive = {
...
case GetEvent(event) =>
def notFound() = sender() ! None
def getEvent(child: ActorRef) = child forward TicketSeller.GetEvent
context.child(event).fold(notFound())(getEvent)
...
BoxOffice TicketSeller
GetEvent
None
Copyright © 2018 TIS Inc. All rights reserved. 58
Return Events message
pipeを使って、処理完了時にFuture内の値(Events)
を送信元に返信する
3.6.[BoxOffice			]	returns	Events	message	to	sender
class BoxOffice(implicit timeout: Timeout) extends Actor {
...
def receive = {
...
case GetEvents =>
import akka.pattern.ask
import akka.pattern.pipe
def getEvents = context.children.map { child =>
self.ask(GetEvent(child.path.name)).mapTo[Option[Event]]
}
def convertToEvents(f: Future[Iterable[Option[Event]]]) =
f.map(_.flatten).map(l=> Events(l.toVector))
pipe(convertToEvents(Future.sequence(getEvents))) to sender()
...
RestApi BoxOffice
Events
Copyright © 2018 TIS Inc. All rights reserved. 59
Exercise 3: learned
応答が必要なメッセージ、⾃⾝へのメッセージ送信
send	message	which	needs	a	response
send	message	to	myself
self.ask(GetEvent(child.path.name)).mapTo[Option[Event]]
pipe(convertToEvents(Future.sequence(getEvents))) to sender()
self.ask(GetEvent(child.path.name)).mapTo[Option[Event]]
Copyright © 2018 TIS Inc. All rights reserved.
Exercise 4. Cancel an event
60
演習4.イベントのキャンセル
Copyright © 2018 TIS Inc. All rights reserved. 61
The flow of Canceling an event
イベントをキャンセルするフロー
CancelEvent
Cancel
Event
DELETE	
/events/RHCP
OK	200 None
PoisonPill
HTTP	Route	
RestApi
Actor	
BoxOffice
Actor	
TicketSeller
Copyright © 2018 TIS Inc. All rights reserved. 62
CancelEvent
Cancel
Event
DELETE	
/events/RHCP
OK	200 None
PoisonPill
HTTP	Route	
RestApi
Actor	
BoxOffice
Actor	
TicketSeller
The flow of Canceling an event: implement points
実装するところ
メッセージ送信(Cancel/ Event)、アクターの停⽌
Copyright © 2018 TIS Inc. All rights reserved. 63
Exercise 4: Send Cancel message and stop TicketSeller actor
演習4:Cancelメッセージの送信とTicketSellerアク
ターの停⽌
Send	Cancel	message	from	BoxOffice	to	TicketSeller	
4.1.[TicketSeller]	define	message	protocol	
4.2.[TicketSeller]	behavior	when	receive	messages	
return	Event	message	
send	PoisonPill	to	self	
4.3.[BoxOffice			]	forward	Cancel	message
Copyright © 2018 TIS Inc. All rights reserved. 64
Exercise 4: Run the app
$sbt	run
$http	POST	localhost:5000/events/RHCP	tickets:=10	
...	
$http	POST	localhost:5000/events/RHCP/tickets	tickets:=2	
...	
$http	GET	localhost:5000/events/	
...	
$http	DELETE	localhost:5000/events/RHCP	
HTTP/1.1	200	OK	
...	
{	
				"name":	"RHCP",	
				"tickets":	8	
}
Run	the	app
Send	a	HTTP	request
イベントキャンセルの動作確認
Copyright © 2018 TIS Inc. All rights reserved. 65
Send	Cancel	message	from	BoxOffice	to	TicketSeller
PoisonPillメッセージを送信してアクターを停⽌する
4.1.[TicketSeller]	define	message	protocol	
4.2.[TicketSeller]	behavior	when	receive	messages	
- return	Event	message	
- send	PoisonPill	to	self	
4.3.[BoxOffice			]	forward	Cancel	message
object TicketSeller {
case object Cancel
}
class TicketSeller(event: String) extends Actor {
def receive = LoggingReceive {
case Cancel =>
sender() ! Some(BoxOffice.Event(event, tickets.size))
self ! PoisonPill
class BoxOffice(implicit timeout: Timeout) extends Actor with ActorLogging {
def receive = LoggingReceive {
case CancelEvent(event) =>
def notFound() = sender() ! None
def cancelEvent(child: ActorRef) = child forward TicketSeller.Cancel
context.child(event).fold(notFound())(cancelEvent)
Copyright © 2018 TIS Inc. All rights reserved. 66
RestApi
RestRoutes	trait
trait RestRoutes extends BoxOfficeApi with EventMarshalling {
import StatusCodes._
def routes: Route = eventsRoute ~ eventRoute ~ ticketsRoute
def eventsRoute = ...
def eventRoute =
pathPrefix("events" / Segment) { event =>
pathEndOrSingleSlash {
post {
...
} ~
get {
...
} ~
delete {
// DELETE /events/:event
onSuccess(cancelEvent(event)) {
_.fold(complete(NotFound))(e => complete(OK, e))
}
}
}
}
RestRoutesトレイト
Copyright © 2018 TIS Inc. All rights reserved. 67
RestApi
BoxOfficeApi	trait
trait BoxOfficeApi {
import BoxOffice._
def createBoxOffice(): ActorRef
implicit def executionContext: ExecutionContext
implicit def requestTimeout: Timeout
lazy val boxOffice = createBoxOffice()
...
def cancelEvent(event: String) =
boxOffice.ask(CancelEvent(event))
.mapTo[Option[Event]]
...
}
BoxOfficeApiトレイト
Copyright © 2018 TIS Inc. All rights reserved. 68
Exercise 4: learned
アクターの停⽌、RestAPI
stop	Actor
Rest	API
class TicketSeller(event: String) extends Actor {
def receive = LoggingReceive {
case Cancel =>
sender() ! Some(BoxOffice.Event(event, tickets.size))
self ! PoisonPill
def routes: Route = eventsRoute ~ eventRoute ~ ticketsRoute
def eventRoute =
pathPrefix("events" / Segment) { event =>
pathEndOrSingleSlash {
delete {
// DELETE /events/:event
}
Copyright © 2018 TIS Inc. All rights reserved.
Chapter 2. Up and running
69
•Fetching a project template
•Building a minimal Akka app for the cloud
•Deploying to Heroku
第2章 最⼩のAkkaアプリケーション
• Herokuへのデプロイ
Copyright © 2018 TIS Inc. All rights reserved. 70
Into the cloud
Create	the	app	on	Heroku
$cd ..
$heroku login
$heroku create
Creating app... done, ⬢ vast-harbor-91925
https://vast-harbor-91925.herokuapp.com/ | https://git.heroku.com/vast-harbor-91925.git
Heroku上にアプリケーションを作成する
install	heroku	CLI
$brew	install	heroku
Copyright © 2018 TIS Inc. All rights reserved. 71
Into the cloud
Push	the	code	to	Heroku	
$git subtree push --prefix chapter-up-and-running heroku master
----> Scala app detected
-----> Installing OpenJDK 1.8... done
.... // 依存するライブラリが解決され、ダウンロードされる
....
-----> Compressing...
Done: 68.8M
-----> Launching...
Released v1
https://damp-bayou-9575.herokuapp.com/ deployed to Heroku
To git@heroku.com:damp-bayou-9575.git
* [new branch] master -> master
$ http POST damp-bayou-9575.herokuapp.com/events/RHCP tickets:=250
$ http POST damp-bayou-9575.herokuapp.com/events/RHCP/tickets tickets:=4
Test	Heroku	instance	with	HTTPie
ソースコードをHerokuにプッシュして、動作確認
Copyright © 2018 TIS Inc. All rights reserved.
Conclusion
72
まとめ
Copyright © 2018 TIS Inc. All rights reserved. 73
Conclusion
Done	
• built	a	minimal	set	of	REST	services	using	Akka	
Next	Exercises	
• lost	data	if	the	application	restarts	
• neither	scale	up	nor	out	
• doesn’t	know	how	to	test	
• the	whole	system	is	down	when	a	server	fails
Akkaを使って⼩さなRESTサービスを作りました。
しかし、再起動すると?スケールアウトは?テストは?障害起きると...
Copyright © 2018 TIS Inc. All rights reserved.
Reference materials
74
Amazonとかにレビューを書いてくださる⽅に『Akka実
践バイブル』をプレゼント!!
• メニーコア時代のパラダイム リアクティブシステムを知ろう(ThinkIT)
THANK YOU

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Akka in Action workshop #ScalaMatsuri 2018

  • 1. Copyright © 2018 TIS Inc. All rights reserved. Akka in Action workshop Scala Matsuri 2018 Yugo Maede @yugolf The preparation for this workshop. https://github.com/akka-ja/akka-in-action/tree/matsuri/chapter-up-and-running#the-preparation
  • 2. Copyright © 2018 TIS Inc. All rights reserved. 2 Who am I? Yugo Maede @yugolf TIS Inc. research and development using Akka, Scala and others Translated Akkaを使ったシステム開発や研究活動をやっています。 仲間募集開始!! We are recruiting colleagues to work together with us.
  • 3. Copyright © 2018 TIS Inc. All rights reserved. 3 TISカジュアルはじめました 2018.3.1 TIS casual has started! We are hiring!
  • 4. Copyright © 2018 TIS Inc. All rights reserved. 4 Todayʼs Topics Building a minimal Akka app The first step for Akka • How to implement Apps by using Akka • How to study Akka for the future Akkaで最⼩のアプリケーションを構築する  Akkaを使った実装の取っ掛かりに
  • 5. Copyright © 2018 TIS Inc. All rights reserved. 5 Material 教材は『Akka実践バイブル』 ✦here
  • 6. Copyright © 2018 TIS Inc. All rights reserved. 6 Akka in Action 『Akka実践バイブル』の内容 Appendix. Using Akka from Java https://www.manning.com/books/akka-in-action
  • 7. Copyright © 2018 TIS Inc. All rights reserved. 7 Agenda • Introduction • Chapter1. Introducing Akka • Chapter2. Up and running • Fetching a project template • Building a minimal Akka app for the cloud 4 exercises • Deploying to Heroku • Conclusion アジェンダ
  • 8. Copyright © 2018 TIS Inc. All rights reserved. Chapter 1. Introducing Akka 8 第1章 Akkaの紹介
  • 9. Copyright © 2018 TIS Inc. All rights reserved. 9 Chapter 1. Introducing Akka Akkaとは/概要/従来型との違い/アクターのプログ ラミングモデル/Akkaのアクター 1.1. What is Akka? 1.2. Actors: a quick overview 1.3. Two approaches to scaling: setting up our example 1.4. Traditional scaling 1.5. Scaling with Akka 1.6. Actors: one programming model to rule up and out 1.7. Akka actors
  • 10. Copyright © 2018 TIS Inc. All rights reserved. 10 What is Akka? Akkaは並⾏・分散アプリケーションのためのツール キット •The toolkit for concurrent and distributed applications •scale applications both up and out on the JVM •keep the complexity relatively low while an application scales
  • 11. Copyright © 2018 TIS Inc. All rights reserved. 11 Actors: a quick overview アクターからアクターへメッセージを送信、受信した メッセージを到着順に処理 User Actor processes messages in order of arrival TicketSeller Buy Buy Buy mailbox ticketSeller ! Buy(tickets)
  • 12. Copyright © 2018 TIS Inc. All rights reserved. 12 Traditional scaling and Akka scaling アクターと伝統的なアプローチの⽐較 • Traditional • Akka
  • 13. Copyright © 2018 TIS Inc. All rights reserved. 13 Traditional scaling and Akka scaling ゴール:データは永続性あるものに、機能はインタラク ティブに、サービスは疎結合に、そして障害に強く Goal Traditional approach Akka approach Make data durable, even if the application restarts or crashes. Use the database as one big shared mutable state. Continue to use in-memory state. Changes to the state are sent as messages to a log. Provide interactive features Poll the database, even if there’s no change in the data. Push events to interested parties, only when there’s a significant event. Decoupling of services Add a message queue for asynchronous processing. No need to add a message queue; actors are asynchronous by definition. Prevent failure of the total system when critical services fail predicting all failure scenarios and catching exceptions. no impact on the stability of the other components.
  • 14. Copyright © 2018 TIS Inc. All rights reserved. 14 Actors: one programming model to rule up and out 単⼀のプログラミングモデルでスケールアップとスケー ルアウトを実現 The actor model decouples from the number of threads or the number of servers.
  • 15. Copyright © 2018 TIS Inc. All rights reserved. 15 Akka actors: Actor System Akkaのアクターはアクターシステムを作成することか ら https://doc.akka.io/docs/akka/2.5/general/supervision.html val system = ActorSystem("TeamChat")
  • 16. Copyright © 2018 TIS Inc. All rights reserved. 16 Akka actors: ActorRef and Mailbox and Actor ActorRefに到着したメッセージは⼀時的にメールボッ クスに保存し到着順に処理する
  • 17. Copyright © 2018 TIS Inc. All rights reserved. Chapter 2. Up and running 17 第2章 最⼩のAkkaアプリケーション
  • 18. Copyright © 2018 TIS Inc. All rights reserved. Chapter 2. Up and running 18 •Fetching a project template •Building a minimal Akka app for the cloud •Deploying to Heroku 第2章 最⼩のAkkaアプリケーション • プロジェクトテンプレートの取得
  • 19. Copyright © 2018 TIS Inc. All rights reserved. 19 Fetching a project template Gitからプロジェクトを取得してアプリケーションを実⾏ • Clone the example project from github.com $git clone https://github.com/akka-ja/akka-in-action.git $cd akka-in-action/chapter-up-and-running/ $sbt run https://github.com/akka-ja/akka-in-action/tree/matsuri/chapter-up-and-running#the-commands-using-this-workshop • Start the app [info] Running com.goticks.Main INFO [Slf4jLogger]: Slf4jLogger started INFO [go-ticks]: RestApi bound to /0:0:0:0:0:0:0:0:5000 INFO [go-ticks]: Success to bind to 0.0.0.0:5000
  • 20. Copyright © 2018 TIS Inc. All rights reserved. 20 The structure of the project プロジェクトの構造 configuration files and other resources source codes test codes built files for building by sbt for executing on Heroku https://www.jetbrains.com/idea/download/
  • 21. Copyright © 2018 TIS Inc. All rights reserved. 21 Ticket-selling service チケット販売サービス イベント作成/キャンセル/⼀覧取得/チケット購⼊ • Get all events • Buy tickets • Create an event • Cancel an event Ticket-selling service
  • 22. Copyright © 2018 TIS Inc. All rights reserved. 22 Letʼs run the app まずは、動かしてみましょう! HTTPリクエストのツールをインストールしてアプリを起動 • Prepare for executing http requests • install HTTPie or Advanced REST client - CLI: HTTPie (https://httpie.org/) - GUI: Advanced REST client(Chrome Extensions) https://chrome.google.com/webstore/detail/advanced-rest- client/hgmloofddffdnphfgcellkdfbfbjeloo $brew install httpie
  • 23. Copyright © 2018 TIS Inc. All rights reserved. 23 How to use HTTPie HTTPieを使ったHTTPリクエストの送信⽅法 • CLI: HTTPie $http POST localhost:5000/events/RHCP tickets:=10 HTTP/1.1 201 Created Content-Length: 28 Content-Type: application/json Date: Sat, 10 Mar 2018 09:27:25 GMT Server: GoTicks.com REST API { "name": "RHCP", "tickets": 10 }
  • 24. Copyright © 2018 TIS Inc. All rights reserved. 24 How to use REST client Advanced REST clientを使ったリクエストの送信⽅法 • GUI: Advanced REST client(Chrome Extensions) (1) (2) (3) (4) (8) http://localhost:5000/events/RHCP (5) (6) (7) {"tickets":10}
  • 25. Copyright © 2018 TIS Inc. All rights reserved. 25 How to send 4 types of HTTP requests 4つのHTTPリクエストの送信⽅法 • Create an event • Get all events • Buy tickets • Cancel an event $http POST localhost:5000/events/RHCP tickets:=10 $http GET localhost:5000/events $http POST localhost:5000/events/RHCP/tickets tickets:=2 $http DELETE localhost:5000/events/RHCP/
  • 26. Copyright © 2018 TIS Inc. All rights reserved. 26 イベントの作成、参照、購⼊、、、キャンセル、、、 >get all events >buy 2 “RHCP” tickets >get all events >buy 8 “RHCP” tickets >buy 2 “RHCP” tickets > create “RHCP” event with 10 tickets > create “ScalaMatsuri” event with 20 tickets > cancel “ScalaMatsuri” > get all events Letʼs run the app
  • 27. Copyright © 2018 TIS Inc. All rights reserved. Chapter 2. Up and running 27 •Fetching a project template •Building a minimal Akka app for the cloud •Deploying to Heroku 第2章 最⼩のAkkaアプリケーション • 最⼩のAkkaアプリケーションをクラウドに構築
  • 28. Copyright © 2018 TIS Inc. All rights reserved. 28 Fetching a project template for workshop ワークショップ⽤ブランチの取得 $ git checkout matsuri
  • 29. Copyright © 2018 TIS Inc. All rights reserved. ActorSystem “go-ticks” 29 The structure of the application アプリケーションの構造 Main HTTP Server HTTP Route RestApi Actor BoxOffice Actor TicketSeller run new create create create
  • 30. Copyright © 2018 TIS Inc. All rights reserved. 30 The structure of the Actors アクターの構造  チケット売り場とチケット販売員 RHCP Scala Matsuri boxOffice create Add/Buy/Cancel/… Actor BoxOffice Actor TicketSeller
  • 31. Copyright © 2018 TIS Inc. All rights reserved. Exercise 0. Create ActorSystem 31 演習0.アクターシステムの⽣成
  • 32. Copyright © 2018 TIS Inc. All rights reserved. ActorSystem “go-ticks” 32 Create ActorSystem アクターシステムの⽣成 Main HTTP Server HTTP Route RestApi Actor BoxOffice Actor TicketSeller run new create create create
  • 33. Copyright © 2018 TIS Inc. All rights reserved. 33 Create “go-ticks” ActorSystem ActorSystem「go-ticks」の⽣成 0.0.[Main] create ActorSystem Run the App implicit val system = ActorSystem(“go-ticks”) $ sbt run ... [info] Running com.goticks.Main INFO [Slf4jLogger]: Slf4jLogger started INFO [go-ticks]: RestApi bound to /0:0:0:0:0:0:0:0:5000 INFO [go-ticks]: Success to bind to 0.0.0.0:5000
  • 34. Copyright © 2018 TIS Inc. All rights reserved. Exercise 1. Create an event 34 演習1.イベントの作成
  • 35. Copyright © 2018 TIS Inc. All rights reserved. 35 HTTP Route RestApi Actor BoxOffice Actor TicketSeller CreateEvent create EventCreated EventExists POST /events/RHCP Created 201 BadRequest 400 Add イベントを作成するフロー The flow of creating an event
  • 36. Copyright © 2018 TIS Inc. All rights reserved. 36 The flow of creating an event: implement points 実装するところ Actorの⽣成とメッセージ送信(Add/ EventCreated) HTTP Route RestApi Actor BoxOffice Actor TicketSeller CreateEvent create AddEventCreated EventExists POST /events/RHCP Created 201 BadRequest 400
  • 37. Copyright © 2018 TIS Inc. All rights reserved. 37 Exercise 1: Define and create Actors and send messages 演習1:TicketSellerアクターの⽣成、Addメッセージ の送信、EventCreatedメッセージの返信 • Create TicketSeller actor 1.1.[TicketSeller] define actor factory method 1.2.[BoxOffice ] create TicketSeller actor • Send Add message from BoxOffice to TicketSeller 1.3.[TicketSeller] define message protocol 1.4.[TicketSeller] behavior when receive messages 1.5.[BoxOffice ] send Add message • Return EventCreated message from BoxOffice to RestApi 1.6.[BoxOffice ] return EventCreated message
  • 38. Copyright © 2018 TIS Inc. All rights reserved. 38 Exercise 1: Run the app イベント作成の動作確認 Run the app $cd akka-in-action/chapter-up-and-running/ $sbt run ... INFO [Slf4jLogger]: Slf4jLogger started INFO [go-ticks]: RestApi bound to /0:0:0:0:0:0:0:0:5000 INFO [go-ticks]: Success to bind to 0.0.0.0:5000 Send a HTTP request $http POST localhost:5000/events/RHCP tickets:=10 HTTP/1.1 201 Created ... { "name": "RHCP", "tickets": 10 }
  • 39. Copyright © 2018 TIS Inc. All rights reserved. 39 Create TicketSeller actor TicketSellerアクターの⽣成 1.1.[TicketSeller] define actor factory method 1.2.[BoxOffice ] create TicketSeller actor object TicketSeller { def props(event: String) = Props(new TicketSeller(event)) } class BoxOffice(implicit timeout: Timeout) extends Actor { ... def createTicketSeller(name: String) = context.actorOf(TicketSeller.props(name), name) def receive = { case CreateEvent(name, tickets) => def create() = { val eventTickets = createTicketSeller(name) ... } context.child(name).fold(create())(_ => sender() ! EventExists) } BoxOffice TicketSeller create
  • 40. Copyright © 2018 TIS Inc. All rights reserved. 40 Send Add message from BoxOffice to TicketSeller Addメッセージの送信(BoxOffice->TicketSeller) 1.3.[TicketSeller] define message protocol 1.4.[TicketSeller] behavior when receive messages 1.5.[BoxOffice ] send Add message object TicketSeller { case class Add(tickets: Vector[Ticket]) } class BoxOffice(implicit timeout: Timeout) extends Actor { ... def receive = { case CreateEvent(name, tickets) => def create() = { ... eventTickets ! TicketSeller.Add(newTickets) } context.child(name).fold(create())(_ => sender() ! EventExists) class TicketSeller(event: String) extends Actor { import TicketSeller._ var tickets = Vector.empty[Ticket] def receive = { case Add(newTickets) => tickets = tickets ++ newTickets } BoxOffice TicketSeller Add
  • 41. Copyright © 2018 TIS Inc. All rights reserved. 41 Return EventCreated message from BoxOffice to RestApi EventCreatedメッセージの返信(RestApi<-BoxOffice) 1.6.[BoxOffice ] return EventCreated message class BoxOffice(implicit timeout: Timeout) extends Actor { ... def receive = { case CreateEvent(name, tickets) => def create() = { ... eventTickets ! TicketSeller.Add(newTickets) sender() ! EventCreated(Event(name, tickets)) } context.child(name).fold(create())(_ => sender() ! EventExists) } RestApi BoxOffice EventCreated
  • 42. Copyright © 2018 TIS Inc. All rights reserved. 42 Exercise 1: learned アクターの⽣成、メッセージ送信、メッセージプロトコ ルの定義、メッセージを受信したときのふるまい • create Actor • send messages • behavior when receive messages • define message protocol context.actorOf(TicketSeller.props(name), name) eventTickets ! TicketSeller.Add(newTickets) object TicketSeller { case class Add(tickets: Vector[Ticket]) } class BoxOffice(implicit timeout: Timeout) extends Actor { def receive = { case Add(newTickets) => ... object TicketSeller { def props(event: String) = Props(new TicketSeller(event)) }
  • 43. Copyright © 2018 TIS Inc. All rights reserved. Exercise 2. Buy tickets 演習2.チケットの購⼊
  • 44. Copyright © 2018 TIS Inc. All rights reserved. 44 The flow of buying tickets チケットを購⼊するフロー GetTicketsPOST /events/RHCP/tickets Created 201 NotFound 404 HTTP Route RestApi Actor BoxOffice Actor TicketSeller Buy Tickets
  • 45. Copyright © 2018 TIS Inc. All rights reserved. 45 GetTickets Buy Tickets POST /events/RHCP/tickets Created 201 NotFound 404 HTTP Route RestApi Actor BoxOffice Actor TicketSeller 実装するところ メッセージ送信(Buy/ Tickets) The flow of buying tickets: implement points
  • 46. Copyright © 2018 TIS Inc. All rights reserved. 46 Exercise 2: Send Buy message and return Tickets message 演習2:Buyメッセージを送信して、Ticketsメッセー ジを返信する • Send Buy message from BoxOffice to TicketSeller 2.1.[TicketSeller] define message protocol 2.2.[TicketSeller] behavior when receive messages - return Tickets message 2.3.[BoxOffice ] forward Buy message
  • 47. Copyright © 2018 TIS Inc. All rights reserved. 47 チケット購⼊の動作確認 $sbt run $http POST localhost:5000/events/RHCP tickets:=10 ... $http POST localhost:5000/events/RHCP/tickets tickets:=2 HTTP/1.1 201 Created ... { "entries": [ { "id": 1 }, { "id": 2 } ], "event": "RHCP" } Exercise 2: Run the app Run the app Send a HTTP request
  • 48. Copyright © 2018 TIS Inc. All rights reserved. 48 Send Buy message from BoxOffice to TicketSeller 送信元アクターに直接返信させるためforwardする 2.1.[TicketSeller] define message protocol 2.2.[TicketSeller] behavior when receive messages - return Tickets message 2.3.[BoxOffice ] forward Buy message object TicketSeller { case class Buy(tickets: Int) case class Tickets(event: String, entries: Vector[Ticket] = Vector.empty[Ticket]) class TicketSeller(event: String) extends Actor { def receive = { case Buy(nrOfTickets) => val entries = tickets.take(nrOfTickets) if(entries.size >= nrOfTickets) { sender() ! Tickets(event, entries) tickets = tickets.drop(nrOfTickets) } else sender() ! Tickets(event) def receive = { case GetTickets(event, tickets) => ... def buy(child: ActorRef) = child.forward(TicketSeller.Buy(tickets)) BoxOffice TicketSeller Buy BoxOffice Tickets
  • 49. Copyright © 2018 TIS Inc. All rights reserved. 49 Exercise 2: learned メッセージの転送 • forward message child.forward(TicketSeller.Buy(tickets))
  • 50. Copyright © 2018 TIS Inc. All rights reserved. Exercise 3. Get all events 50 演習3.イベント⼀覧の取得
  • 51. Copyright © 2018 TIS Inc. All rights reserved. 51 The flow of getting all events イベント⼀覧を取得するフロー GetEventsGET /events/ OK 200 Events HTTP Route RestApi Actor BoxOffice Actor TicketSeller GetEvent None GetEvent Event Events
  • 52. Copyright © 2018 TIS Inc. All rights reserved. 52 GetEvents GetEvent Event GET /events/ OK 200 Events GetEvent None Events HTTP Route RestApi Actor BoxOffice Actor TicketSeller The flow of getting all events: implement points 実装するところ メッセージ送信(GetEvent/ None/ Event/ Events)
  • 53. Copyright © 2018 TIS Inc. All rights reserved. 53 Exercise 3: Send GetEvent message and return Event message • Return Event 3.1.[TicketSeller] defines message protocol 3.2.[TicketSeller] behavior when receive messages - return Event message • Send GetEvent message from BoxOffice to self 3.3.[BoxOffice ] sends GetEvent message to self • Define behavior when receive GetEvent message 3.4.[BoxOffice ] doesn’t find a child actor: - return None message 3.5.[BoxOffice ] finds a child actor: - forward GetEvent message • Return Events message 3.6.[BoxOffice ] returns Events message to sender 演習3:GetEventメッセージを送信して、Eventメッ セージを返信する
  • 54. Copyright © 2018 TIS Inc. All rights reserved. 54 Exercise 3: Run the app チケット⼀覧取得の動作確認 $sbt run $http POST localhost:5000/events/RHCP tickets:=10 ... $http POST localhost:5000/events/RHCP/tickets tickets:=2 ... $http GET localhost:5000/events/ HTTP/1.1 200 OK ... { "events": [ { "name": "RHCP", "tickets": 8 } ] } Run the app Send a HTTP request
  • 55. Copyright © 2018 TIS Inc. All rights reserved. 55 Return Event 3.1.[TicketSeller] defines message protocol 3.2.[TicketSeller] behavior when receive messages - return Event message class TicketSeller(event: String) extends Actor { def receive = { ... case GetEvent => sender() ! Some(BoxOffice.Event(event, tickets.size)) object TicketSeller { case object GetEvent } GetEventメッセージを受信したら、Eventメッセージ を返す BoxOffice TicketSeller Event
  • 56. Copyright © 2018 TIS Inc. All rights reserved. 56 Send GetEvent message from BoxOffice to self GetEventメッセージを⾃⾝(self)に送信する 3.3.[BoxOffice ] sends GetEvent message to self class BoxOffice(implicit timeout: Timeout) extends Actor { ... def receive = { ... case GetEvents => import akka.pattern.ask def getEvents = context.children.map { child => self.ask(GetEvent(child.path.name)).mapTo[Option[Event]] } BoxOffice GetEvent
  • 57. Copyright © 2018 TIS Inc. All rights reserved. 57 Define behavior when receive GetEvent message GetEventメッセージを受信したときのふるまい 3.4.[BoxOffice ] doesn’t find a child actor: - return None message 3.5.[BoxOffice ] finds a child actor: - forward GetEvent message class BoxOffice(implicit timeout: Timeout) extends Actor { ... def receive = { ... case GetEvent(event) => def notFound() = sender() ! None def getEvent(child: ActorRef) = child forward TicketSeller.GetEvent context.child(event).fold(notFound())(getEvent) ... BoxOffice TicketSeller GetEvent None
  • 58. Copyright © 2018 TIS Inc. All rights reserved. 58 Return Events message pipeを使って、処理完了時にFuture内の値(Events) を送信元に返信する 3.6.[BoxOffice ] returns Events message to sender class BoxOffice(implicit timeout: Timeout) extends Actor { ... def receive = { ... case GetEvents => import akka.pattern.ask import akka.pattern.pipe def getEvents = context.children.map { child => self.ask(GetEvent(child.path.name)).mapTo[Option[Event]] } def convertToEvents(f: Future[Iterable[Option[Event]]]) = f.map(_.flatten).map(l=> Events(l.toVector)) pipe(convertToEvents(Future.sequence(getEvents))) to sender() ... RestApi BoxOffice Events
  • 59. Copyright © 2018 TIS Inc. All rights reserved. 59 Exercise 3: learned 応答が必要なメッセージ、⾃⾝へのメッセージ送信 send message which needs a response send message to myself self.ask(GetEvent(child.path.name)).mapTo[Option[Event]] pipe(convertToEvents(Future.sequence(getEvents))) to sender() self.ask(GetEvent(child.path.name)).mapTo[Option[Event]]
  • 60. Copyright © 2018 TIS Inc. All rights reserved. Exercise 4. Cancel an event 60 演習4.イベントのキャンセル
  • 61. Copyright © 2018 TIS Inc. All rights reserved. 61 The flow of Canceling an event イベントをキャンセルするフロー CancelEvent Cancel Event DELETE /events/RHCP OK 200 None PoisonPill HTTP Route RestApi Actor BoxOffice Actor TicketSeller
  • 62. Copyright © 2018 TIS Inc. All rights reserved. 62 CancelEvent Cancel Event DELETE /events/RHCP OK 200 None PoisonPill HTTP Route RestApi Actor BoxOffice Actor TicketSeller The flow of Canceling an event: implement points 実装するところ メッセージ送信(Cancel/ Event)、アクターの停⽌
  • 63. Copyright © 2018 TIS Inc. All rights reserved. 63 Exercise 4: Send Cancel message and stop TicketSeller actor 演習4:Cancelメッセージの送信とTicketSellerアク ターの停⽌ Send Cancel message from BoxOffice to TicketSeller 4.1.[TicketSeller] define message protocol 4.2.[TicketSeller] behavior when receive messages return Event message send PoisonPill to self 4.3.[BoxOffice ] forward Cancel message
  • 64. Copyright © 2018 TIS Inc. All rights reserved. 64 Exercise 4: Run the app $sbt run $http POST localhost:5000/events/RHCP tickets:=10 ... $http POST localhost:5000/events/RHCP/tickets tickets:=2 ... $http GET localhost:5000/events/ ... $http DELETE localhost:5000/events/RHCP HTTP/1.1 200 OK ... { "name": "RHCP", "tickets": 8 } Run the app Send a HTTP request イベントキャンセルの動作確認
  • 65. Copyright © 2018 TIS Inc. All rights reserved. 65 Send Cancel message from BoxOffice to TicketSeller PoisonPillメッセージを送信してアクターを停⽌する 4.1.[TicketSeller] define message protocol 4.2.[TicketSeller] behavior when receive messages - return Event message - send PoisonPill to self 4.3.[BoxOffice ] forward Cancel message object TicketSeller { case object Cancel } class TicketSeller(event: String) extends Actor { def receive = LoggingReceive { case Cancel => sender() ! Some(BoxOffice.Event(event, tickets.size)) self ! PoisonPill class BoxOffice(implicit timeout: Timeout) extends Actor with ActorLogging { def receive = LoggingReceive { case CancelEvent(event) => def notFound() = sender() ! None def cancelEvent(child: ActorRef) = child forward TicketSeller.Cancel context.child(event).fold(notFound())(cancelEvent)
  • 66. Copyright © 2018 TIS Inc. All rights reserved. 66 RestApi RestRoutes trait trait RestRoutes extends BoxOfficeApi with EventMarshalling { import StatusCodes._ def routes: Route = eventsRoute ~ eventRoute ~ ticketsRoute def eventsRoute = ... def eventRoute = pathPrefix("events" / Segment) { event => pathEndOrSingleSlash { post { ... } ~ get { ... } ~ delete { // DELETE /events/:event onSuccess(cancelEvent(event)) { _.fold(complete(NotFound))(e => complete(OK, e)) } } } } RestRoutesトレイト
  • 67. Copyright © 2018 TIS Inc. All rights reserved. 67 RestApi BoxOfficeApi trait trait BoxOfficeApi { import BoxOffice._ def createBoxOffice(): ActorRef implicit def executionContext: ExecutionContext implicit def requestTimeout: Timeout lazy val boxOffice = createBoxOffice() ... def cancelEvent(event: String) = boxOffice.ask(CancelEvent(event)) .mapTo[Option[Event]] ... } BoxOfficeApiトレイト
  • 68. Copyright © 2018 TIS Inc. All rights reserved. 68 Exercise 4: learned アクターの停⽌、RestAPI stop Actor Rest API class TicketSeller(event: String) extends Actor { def receive = LoggingReceive { case Cancel => sender() ! Some(BoxOffice.Event(event, tickets.size)) self ! PoisonPill def routes: Route = eventsRoute ~ eventRoute ~ ticketsRoute def eventRoute = pathPrefix("events" / Segment) { event => pathEndOrSingleSlash { delete { // DELETE /events/:event }
  • 69. Copyright © 2018 TIS Inc. All rights reserved. Chapter 2. Up and running 69 •Fetching a project template •Building a minimal Akka app for the cloud •Deploying to Heroku 第2章 最⼩のAkkaアプリケーション • Herokuへのデプロイ
  • 70. Copyright © 2018 TIS Inc. All rights reserved. 70 Into the cloud Create the app on Heroku $cd .. $heroku login $heroku create Creating app... done, ⬢ vast-harbor-91925 https://vast-harbor-91925.herokuapp.com/ | https://git.heroku.com/vast-harbor-91925.git Heroku上にアプリケーションを作成する install heroku CLI $brew install heroku
  • 71. Copyright © 2018 TIS Inc. All rights reserved. 71 Into the cloud Push the code to Heroku $git subtree push --prefix chapter-up-and-running heroku master ----> Scala app detected -----> Installing OpenJDK 1.8... done .... // 依存するライブラリが解決され、ダウンロードされる .... -----> Compressing... Done: 68.8M -----> Launching... Released v1 https://damp-bayou-9575.herokuapp.com/ deployed to Heroku To git@heroku.com:damp-bayou-9575.git * [new branch] master -> master $ http POST damp-bayou-9575.herokuapp.com/events/RHCP tickets:=250 $ http POST damp-bayou-9575.herokuapp.com/events/RHCP/tickets tickets:=4 Test Heroku instance with HTTPie ソースコードをHerokuにプッシュして、動作確認
  • 72. Copyright © 2018 TIS Inc. All rights reserved. Conclusion 72 まとめ
  • 73. Copyright © 2018 TIS Inc. All rights reserved. 73 Conclusion Done • built a minimal set of REST services using Akka Next Exercises • lost data if the application restarts • neither scale up nor out • doesn’t know how to test • the whole system is down when a server fails Akkaを使って⼩さなRESTサービスを作りました。 しかし、再起動すると?スケールアウトは?テストは?障害起きると...
  • 74. Copyright © 2018 TIS Inc. All rights reserved. Reference materials 74 Amazonとかにレビューを書いてくださる⽅に『Akka実 践バイブル』をプレゼント!! • メニーコア時代のパラダイム リアクティブシステムを知ろう(ThinkIT)