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5 pillars of a successful
Java Web application
Eder Ignatowicz
Sr. Software Engineer @ Red Hat
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Which backend architecture?
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Java 9 modular, Reactive,
Microservices, Vert.x
Drools, Spring Boot,
Zookeeper, Spark
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And on the front-end?
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Javascript Development
is complex
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Web Javascript
development is complex
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Web development
will stay complex
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Which web stack?
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Which web architecture is most
doable for this problem?
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5 pillars:
Large scale application
Full stack Developers
UX Integration
5~10 years Life-Span
Interoperability
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5 pillars:
Large scale application
Full stack Developers
UX Integration
5~10 years life-span
Interoperability
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Large Scale Application
1mi+ lines of web code
5 projects
~150 subprojects
~30 devs
Code base of 7+ years
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Large Scale Application
Static
Typing
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Large Scale Application
Refactoring
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Large Scale Application
JS Transpilers
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.java
javac .class
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GWT
<3
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GWT
The Good Parts
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GWT GOOD PARTS
Java to JavaScript
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GWT GOOD PARTS
java.* emulation
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GWT GOOD PARTS
DOM APIs
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GWT GOOD PARTS
Java 8
“client side"
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Java 8
List myList =
Arrays.asList("Java7", “Java8",
"Java6", "Kotlin");
myList
.stream()
.filter(s -> s.startsWith("J"))
.map(String::toUpperCase)
.sorted()
.forEach(Console::log);
Prints:
JAVA6
JAVA7
JAVA8
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GWT GOOD PARTS
Dev Tools
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GWT GOOD PARTS
JS Interop
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JS INTEROP - CONSUME
Java
@JsType(isNative = true)
public abstract class JQuery {
@JsMethod(namespace=GLOBAL)
public native static JQuery $(String selector);
public native JQuery css(String prop, String val);
public native JQuery attr(String name, String val);
}
Java
import static jquery.JQuery.$;
// ...
$("ul > li").css("color", "red").attr("data-level", "first");
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JS INTEROP - EXPOSE
Java
package foo;
@JsType
public class Dora {
public boolean late = true;
public Dora() {}
public String auAu() { return "Hello QCon!";}
}
JavaScript
var dora = new foo.Dora();
if (dora.late) {
alert(dora.auAu());
}
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Large Scale Application
Refactoring
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5 pillars:
Large scale application
Full stack Developers
UX Integration
5~10 years life-span
Interoperability
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Devs Full Stack
“End-to-end” developers
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Devs Full Stack
Shared Programming Model
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Devs Full Stack
“Java EE” in browser
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ERRAI
CDI on Browser
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@Dependent
public class ProjectsView {
@Inject
Document document;
@Inject
@DataField( "projects-view" )
Div view;
@Inject
@DataField( "new-project" )
Button newProject;
@Inject
@DataField( "projects-list" )
UnorderedList projectsList;
@Inject
Instance projects;
CDI NO BROWSER
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if (!filter.doFilter(event)) {
if (event.kind().equals(StandardWatchEventKind.ENTRY_ADD)) {
resourceAddedEvent.fire(buildEvent(ResourceAddedEvent.class,
event).getK2());
}
…
}
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public void onNewFile(@Observes ResourceAddedEvent event)
{
Window.alert(
"ResourceAddedEvent:" +
event.getPath().toURI() +
" ['" + event.getMessage() + “‘]");
}
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Server
Browser
Browser Browser
Browser
Long Polling
Web Sockets
SSE
ERRAI BUS
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Devs Full Stack
Shared Programming Model
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5 pillars:
Large scale application
Full stack Developers
UX Integration
5~10 years life-span
Interoperability
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Pizza Types
-
<% for ( Pizza pizza : pizzaTypes ) { %>
- <%=pizza.getName()%> <%=pizza.getPrice()%>$ <% } %>
Size
- Small Medium ( + 2$ ) Large ( + 3$ )
Extra Toppings
<% for ( int j = 0; j < 3; j++ ) { %>
<% } %>
-
<% for ( int i = sliceSize * j; i < ( j + 1 ) * sliceSize; i++ ) { %>
- <%=pizzaToppings.get( i )%> <% } if ( j == 0 && remainder > 0 ) { %>
- <%=pizzaToppings.get( pizzaToppings.size() - 2 ) <% } else if ( j == 1 && remainder > 1 ) { %>
- <%=pizzaToppings.get( pizzaToppings.size() - 1 )%> <% } %>
Each extra topping is 0.65$
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{{title}}
My favorite hero is: {{myHero}}
Heroes:
- {{ hero }}
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@Dependent
@Templated
public class ProjectsView {
@Inject
@DataField( "projects-view" )
Div view;
@Inject
@DataField( "new-project" )
Button newProject;
@Inject
@DataField( "projects-list" )
UnorderedList projectsList;
}
ERRAI UI
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Toggle navigation
-
Messages: 0
- Modified Datasources ExampleDS
- Error: System Failure
- Brian Johnson
Welcome to BPM Suite
Business Process Management (BPM) Suite offers a set of flexible, process management tools that support the way you need to work. Select a BPM tool below to get started.
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UX Integration
Leave the HTML/CSS in peace
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5 pillars:
Large scale application
Full stack Developers
UX Integration
5~10 years life-span
Interoperability
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Architecture
Hexagonal Architecture - Alistair Cockburn
Onion Architecture - Jeffrey Palermo
DCI - James Coplien e Trygve Reenskaug.
BCE - Ivar Jacobson
Clean Architecture - Robert C. Martin
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Principles
Not coupled to Frameworks
Testable
Not coupled with UI technology
Not coupled with Database
Independent of another systems
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"Architecture is about intent.
We have made it about
frameworks and details”
Robert C. Martin
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APPFORMER VFS
Use Cases
VFS
API
Regular FS
Clustering
GIT FS
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Which web framework
should I use?
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Which JS framework?
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JS framework
choice
Years
1 2 3 4 5 6
First
Release
Danger
0
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What’s next for Angular 1.x?
"In all honesty, no one really knows what will happen"
https://toddmotto.com/future-of-angular-1-x
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1 2 3 4 5 6
Years
Deliver
JS
Framework
Choice
Learning
Curve
Project Canceled
or new version
is incompatible
Rewrite on the new
JS framework
Learning
Curve
Project Canceled
or new version
is incompatible
Rewrite on the new
JS framework
Learning
Curve
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"A good architecture allows
volatile decisions to be easily
changed”
Robert C. Martin
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What if I dealt with the volatility of
JS frameworks as a fact?
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Programming Model
Components:
- Screen
- Editors
- Perspectives
- Popups
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Programming Model
LifeCycle:
- OnStart
- OnSave
- IsDirty
- OnClose
- OnFocus
- OnLostFocus
- OnMayClose
- OnReveal
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Perspective
Editor
Screen Screen
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Contract Based
Screen -> Interface WorkbenchScreenActivity
Editor -> Interface WorkbenchEditorActivity
Perspective -> Interface PerspectiveActivity
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Perspectives
Appformer
Lookup
Perspective
ERRAI
CDI BEAN
MANAGER
Scan all
Perspective Activity
Implementations
GWT
Perspective
Adapter
OLD GWT
WIDGET
ERRAI UI
Perspective
Adapter
Plain HTML Errai
UI
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7 years old code with
“old school” GWT
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HTML 5 canvas
fresh code
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5~10 years life-span
The Web architecture should be
treated with the same respect as
you treat your backend.
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5 pillars:
Large scale application
Full stack Developers
UX Integration
5~10 years life-span
Interoperability
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@WorkbenchPerspective(identifier = "HomePerspective",
isDefault = true)
@Templated
public class HomePerspective implements IsElement {
@Inject
@DataField
@WorkbenchPanel(parts = "MoodScreen?uber=fire&uber1=fire1")
Div moodScreen;
@Inject
@DataField
@WorkbenchPanel(parts = "HomeScreen?uber=fire")
Div homeScreen;
@Inject
@DataField
@WorkbenchPanel(parts = "AnotherScreen")
Div anotherScreen;
} @JsType
public interface PerspectiveActivity{
PerspectiveDefinition getDefaultPerspectiveLayout();
@Override
default String getName() {
return getDefaultPerspectiveLayout().getName();
}
boolean isDefault();
Menus getMenus();
ToolBar getToolBar();
}
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function TodoCtrl($scope) {
$scope.placeText = "MiscellaneousFeatures";
$scope.todos = [
{text: 'learn angular', done: true},
{text: 'build an angular app', done: false}
];
$scope.addTodo = function () {
$scope.todos.push({text: $scope.todoText, done: false});
$scope.todoText = '';
};
$scope.remaining = function () {
var count = 0;
angular.forEach($scope.todos, function (todo) {
count += todo.done ? 0 : 1;
});
return count;
};
$scope.archive = function () {
var oldTodos = $scope.todos;
$scope.todos = [];
angular.forEach(oldTodos, function (todo) {
if (!todo.done) {
$scope.todos.push(todo);
}
});
};
$scope["goto"] = function () {
$goToPlace($scope.placeText);
};
}
$registerPlugin({
id: "my_angular_js",
type: "angularjs",
templateUrl: "angular.sample.html",
title: function () {
return "angular " + Math.floor(Math.random() * 10);
},
on_close: function () {
alert("this is a pure JS alert!");
}
});
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Perspectives
Appformer
Lookup
Perspective
ERRAI
CDI BEAN
MANAGER
Scan all
Perspective Activity
Implementations
GWT
Perspective
Adapter
OLD GWT
WIDGET
ERRAI UI
Perspective
Adapter
Plain HTML Errai
UI
Angular
Perspective
Adapter
Angular native
Perspective
Any JS
Perspective
Adapter
Any JS
Framework
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Angular JS Screen
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Creating Components
in Runtime
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5 pillars:
Large scale application
Full stack Developers
UX Integration
5~10 years life-span
Interoperability
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Web development
is complex
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Web applications are
important pieces of
our architecture
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Principles
Not coupled to Frameworks
Testable
Not coupled with UI technology
Not coupled with Database
Independent of another systems
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Software architecture
is trade-offs exercise
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5 pillars:
Large scale application
Full stack Developers
UX Integration
5~10 years life-span
Interoperability
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Eder Ignatowicz
@ederign
http://bit.ly/5-pillars-web