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![Templating
@(customer: Customer, orders: List[Order])
<h1>Welcome @customer.name!</h1>
<ul>
@for(order <- orders) {
<li>@order.title</li>
}
</ul>
val content =
views.html.Hello.index(c, o)](https://image.slidesharecdn.com/4-jvm-web-frameworks-151112102645-lva1-app6892/85/4-JVM-Web-Frameworks-21-320.jpg)
![Streaming HTTP
def index = Action {
val s = getDataStream
val d: Enumerator[Array[Byte]] = Enumerator.fromStream(s)
Ok.chunked(d)
}](https://image.slidesharecdn.com/4-jvm-web-frameworks-151112102645-lva1-app6892/85/4-JVM-Web-Frameworks-27-320.jpg)
![Websockets (with Actors)
class MyWebSocketActor(out: ActorRef) extends Actor {
def receive = {
case msg: String =>
out ! ("I received your message: " + msg)
}
}
WebSocket.acceptWithActor[String, String] { request => out =>
MyWebSocketActor.props(out)
}](https://image.slidesharecdn.com/4-jvm-web-frameworks-151112102645-lva1-app6892/85/4-JVM-Web-Frameworks-28-320.jpg)
![ScalaTest
class StackSpec extends PlaySpec {
"A Stack" must {
"pop values in last-in-first-out order" in {
val stack = new Stack[Int]
stack.push(1)
stack.push(2)
stack.pop() mustBe 2
stack.pop() mustBe 1
}
"throw NoSuchElementException if an empty stack is popped" in {
val emptyStack = new Stack[Int]
a [NoSuchElementException] must be thrownBy {
emptyStack.pop()
}
}
}
}
Testing
$ activator ~test](https://image.slidesharecdn.com/4-jvm-web-frameworks-151112102645-lva1-app6892/85/4-JVM-Web-Frameworks-29-320.jpg)
![Templating
Hiccup Selmer
(html [:ul
(for [x (range 1 4)]
[:li x])])
<ul>
{% for item in items %}
<li> {{item}} </li>
{% endfor %}
</ul>](https://image.slidesharecdn.com/4-jvm-web-frameworks-151112102645-lva1-app6892/85/4-JVM-Web-Frameworks-65-320.jpg)
![Database
(with-transaction [t-conn conn]
(create-user!
{:id "foo"
:first_name "Sam"
:last_name "Smith"})
(get-user {:id "foo"}))
Yesql
--name: create-user!
-- creates a new user record
INSERT INTO users
(id, first_name, last_name)
VALUES (:id, :first_name, :last_name)](https://image.slidesharecdn.com/4-jvm-web-frameworks-151112102645-lva1-app6892/85/4-JVM-Web-Frameworks-67-320.jpg)
![Websockets
(defn reverser
"An example WebSocket app"
[request]
(async/as-channel request
{:on-open (fn [channel]
(async/send! channel "Ready to reverse!"))
:on-message (fn [channel m]
(async/send! channel (apply str (reverse m))))
:on-close (fn [channel {:keys [code reason]}]
(println "close code:" code "reason:" reason))}))](https://image.slidesharecdn.com/4-jvm-web-frameworks-151112102645-lva1-app6892/85/4-JVM-Web-Frameworks-69-320.jpg)
Uploaded byJoe Kutner
4 JVM Web Frameworks
The document discusses various JVM web frameworks including Play, Ratpack, Spring Boot, and Rails. It provides code examples for templating, databases, servers, and other aspects of each framework. It compares the strengths and weaknesses of frameworks like Play, Ratpack, and Spring Boot. It emphasizes that modern JVM web development uses languages like Scala, Groovy, JRuby and Clojure rather than traditional Java web apps with WAR files. The document encourages the audience to pick a framework like Play, Ratpack or Rails and provides the basic commands to create a new project in each.
Internetâ—¦
4 JVM Web Frameworks
- 1. @codefinger#Devoxx #YourTagHere 4 JVM WebFrameworks in 40 minutes
- 2. @codefinger#Devoxx #YourTagHere in 50minutes 4 JVM Web Frameworks 4 JVM Web Frameworks with 10 minutes for questions
- 3. @codefinger#Devoxx #YourTagHere in 50minutes 4 JVM Web Frameworks 4 JVM Web Frameworks with 10 minutes for questions ±5 minutes
- 4.
- 5.
- 6.
- 7.
- 8. What is aeven a web framework??
- 9.
- 10.
- 11. Full Stack (bigcircle) MRA A WC EARS A LM Micro MRA A WC EARS A LM (little circle) Nano Q (no circle)
- 12.
- 13. Templating Server Docs Stack Tooling Language Scala/Java Play Netty A- activator/sbt Persistence Slick TestingScalaTest Full Groovy/Java Groovy Netty B+ Gradle — — Micro JRuby ERB Torquebox A+ Rake ActiveRecord Minitest Full Clojure Hiccup Immutant B+ Lein Yesql clojure.test Nano ?
- 14. Full Stack ReactiveOpinionated
- 15. Client Server Database Blockwait Async IO
- 16. Client Server Database Asyncwait Async IO
- 17. Client Server PostgreSQLMongoDB Async IO
- 18. Client Server PostgreSQLMongoDB Client Server PostgreSQL MongoDB Client Server PostgreSQL MongoDB Async IO
- 19.
- 20.
- 21. Templating @(customer: Customer, orders:List[Order]) <h1>Welcome @customer.name!</h1> <ul> @for(order <- orders) { <li>@order.title</li> } </ul> val content = views.html.Hello.index(c, o)
- 22.
- 23. Database Functional RelationalMapping coffees.filter(_.price < 10.0)
- 24. val crossJoin =for { (c, s) <- coffees join suppliers } yield (c.name, s.name) Database select x2."COF_NAME", x3."SUP_NAME" from "COFFEES" x2 inner join "SUPPLIERS" x3 compiles to… Functional Relational Mapping
- 25. val fullOuterJoin =for { (c, s) <- coffees joinFull suppliers on (_.supID === _.id) } yield (c.map(_.name), s.map(_.name)) Database select x2."COF_NAME", x3."SUP_NAME" from "COFFEES" x2 full outer join "SUPPLIERS" x3 on x2."SUP_ID" = x3."SUP_ID" compiles to… Functional Relational Mapping
- 26. Database Evolutions conf/ ├─ evolutions │  └──default │  ├── 1.sql │  └── 2.sql # --- !Ups create table "people" ( "id" serial not null primary key, "name" varchar not null, "age" int not null ); # --- !Downs drop table "people" if exists;
- 27. Streaming HTTP def index= Action { val s = getDataStream val d: Enumerator[Array[Byte]] = Enumerator.fromStream(s) Ok.chunked(d) }
- 28. Websockets (with Actors) classMyWebSocketActor(out: ActorRef) extends Actor { def receive = { case msg: String => out ! ("I received your message: " + msg) } } WebSocket.acceptWithActor[String, String] { request => out => MyWebSocketActor.props(out) }
- 29. ScalaTest class StackSpec extendsPlaySpec { "A Stack" must { "pop values in last-in-first-out order" in { val stack = new Stack[Int] stack.push(1) stack.push(2) stack.pop() mustBe 2 stack.pop() mustBe 1 } "throw NoSuchElementException if an empty stack is popped" in { val emptyStack = new Stack[Int] a [NoSuchElementException] must be thrownBy { emptyStack.pop() } } } } Testing $ activator ~test
- 30. Pros Great for… • Traditionalweb apps with lots of IO • Getting something up and running fast • High Powered apps, which is often mutually exclusive with getting started fast.
- 31. Cons Not so greatif… • You don’t like heavy-handed tools • You like backward compatibility
- 32. Templating Server Docs Stack Tooling Language Scala/Java Play Netty A- activator/sbt Persistence Slick TestingScalaTest Full Groovy/Java Groovy Netty B+ Gradle — — Micro JRuby ERB Torquebox A+ Rake ActiveRecord Minitest Full Clojure Hiccup Immutant B+ Lein Yesql clojure.test Nano
- 33.
- 35. Async IO Client ServerDatabase Async wait
- 36.
- 37.
- 38.
- 39.
- 40. ratpack { bindings { moduleDropwizardMetricsModule } handlers { all { MetricsRegistry -> mr mr.counter(“request-count”).inc() next() } get { // ... } } } Metrics Dropwizard
- 41. ratpack { bindings { modulesHystrixModule } handlers { get(“users”) { new HysterixObservableCommand<User>(... //... } } } } Fault Tolerance Hystrix Hystrix is a latency and fault tolerance library designed to isolate points of access to remote systems, services and 3rd party libraries, stop cascading failure and enable resilience in complex distributed systems where failure is inevitable.
- 42. ratpack { handlers { get{ httpClient.get(“http://host”.toURI()) { s -> s .headers { h -> h.set(HttpHeaderNames.ACCEPT, “application/json”) } }.then { resp -> render(resp) } } } } Non-blocking HTTP Client
- 43. Templating Server Docs Stack Tooling Language Scala/Java Play Netty A- activator/sbt Persistence Slick TestingScalaTest Full Groovy/Java Groovy Netty B+ Gradle — — Micro JRuby ERB Torquebox A+ Rake ActiveRecord Minitest Full Clojure Hiccup Immutant B+ Lein Yesql clojure.test Nano
- 44. vs. Strengths Netty Netty Full-Stack Microservices TraditionalWeb-app API, Circuit Breaker Weaknesses Monolith New(ish) Async IO Async IO Backward Compatibility Docs
- 45.
- 46. @codefinger#Devoxx #YourTagHere in 50minutes 4 JVM Web Frameworks 4 JVM Web Frameworks with 10 minutes for questions ±5 minutes with a few minutes for intermission
- 47.
- 48. Full Stack ConventionOpinionated
- 49.
- 50. Synchronous IO Client ServerDatabase Block wait
- 51.
- 52. Tooling $ rails new $rails generate $ rails asset:precompile $ rails server $ rake routes
- 53. Templating ERB <% @books.eachdo |book| %> <tr> <td><%= book.title %></td> <td><%= book.content %></td> <td><%= link_to "Show", book %></td> <td><%= link_to "Edit", edit_book_path(book) %></td> </tr> <% end %>
- 54. Database ActiveRecord class Person< ActiveRecord::Base end class CreatePerson < ActiveRecord::Migration def change create_table :persons do |t| t.string :name t.references :bodyguard t.integer :age t.timestamps null: false end end end
- 55.
- 56.
- 57. Templating Server Docs Stack Tooling Language Scala/Java Play Netty A- activator/sbt Persistence Slick TestingScalaTest Full Groovy/Java Groovy Netty B+ Gradle — — Micro JRuby ERB Torquebox A+ Rake ActiveRecord Minitest Full Clojure Hiccup Immutant B+ Lein Yesql clojure.test Nano
- 58. vs. Strengths Netty Torquebox Full-Stack Full-Stack TraditionalWeb App Traditional Web App Weaknesses Complex (Scala) Opinionated Async IO Flexible Mature Approachable (Ruby) Async IO
- 59.
- 60.
- 61. F****work is adirty word For developers…
- 62.
- 63.
- 65. Templating Hiccup Selmer (html [:ul (for[x (range 1 4)] [:li x])]) <ul> {% for item in items %} <li> {{item}} </li> {% endfor %} </ul>
- 66. ClojureScript var zero =0; if (zero) { console.log("Nope!"); } else { console.log("Zero is false!"); } (def zero 0) (if zero (println "Zero is not false!")) Javascript ClojureScript
- 67. Database (with-transaction [t-conn conn] (create-user! {:id"foo" :first_name "Sam" :last_name "Smith"}) (get-user {:id "foo"})) Yesql --name: create-user! -- creates a new user record INSERT INTO users (id, first_name, last_name) VALUES (:id, :first_name, :last_name)
- 68.
- 69. Websockets (defn reverser "An exampleWebSocket app" [request] (async/as-channel request {:on-open (fn [channel] (async/send! channel "Ready to reverse!")) :on-message (fn [channel m] (async/send! channel (apply str (reverse m)))) :on-close (fn [channel {:keys [code reason]}] (println "close code:" code "reason:" reason))}))
- 70. Templating Server Docs Stack Tooling Language Scala/Java Play Netty A- activator/sbt Persistence Slick TestingScalaTest Full Groovy/Java Groovy Netty B+ Gradle — — Micro JRuby ERB Torquebox A+ Rake ActiveRecord Minitest Full Clojure Hiccup Immutant B+ Lein Yesql clojure.test Nano
- 71. vs. Strengths Netty Immutant Microservices Client-SideWeb App API, Circuit Breaker Traditional Web App Weaknesses Async IO Async IO ModularModular Functional Functional
- 72. There is onething all of these frameworks have in common NO WAR FILES
- 73. modern JVM web development usesalternative languages
- 75.
- 76.
- 77. $ lazybones createratpack my-app $ activator new my-app $ rails new my-app $ lein new luminous my-app
- 78. @codefinger#Devoxx #YourTagHere Joe Kutner @codefinger JVMPlatform Owner thank you!