Презентация на тему Java enterprise edition

на Java EE.
https://netbeans.org/kb/docs/javaee/javaee-entapp-ejb_ru.html
Веб-уровень. Веб-уровень содержит логику представления приложения и

запускается на сервере Java EE. В приложении NewsApp веб-уровень представлен веб-модулем и содержит сервлеты, через которые осуществляется доступ к бизнес-логике в модуле EJB.
Бизнес-уровень. Приложения бизнес-уровня также выполняются на сервере Java EE и содержат бизнес-логику приложения. В приложении NewsApp бизнес-уровень представлен модулем EJB. Модуль EJB содержит код для обработки запросов от клиентов веб-уровня и для управления транзакциями и способами сохранения объектов в базе данных.
EIS-уровень. EIS-уровень - это надежный уровень хранения приложения. В приложении NewsApp этот уровень представлен базой данных для сохранения сообщений.

транзакции, синхронизация
Интеграция с другими сервисами
Скорость разработки и развития
Поддержка развёртывания,

конфигурирования, мониторинга

Java EE is Oracle's enterprise Java computing platform. The

platform provides an API and runtime environment for developing and running enterprise software, including network and web services, and other large-scale, multi-tiered, scalable, reliable, and secure network applications. Java EE extends the Java Platform, Standard Edition (Java SE), providing an API for object-relational mapping, distributed and multi-tier architectures, and web services. The platform incorporates a design based largely on modular components running on an application server. Software for Java EE is primarily developed in the Java programming language. The platform emphasizes convention over configuration and annotations for configuration.

class Address implements Serializable {
@Id

protected long id;
String street1;
String street2;
String city;
String province;
…
}

Long id; private String number; public Bus() { }
public void setId(Long

id) { this.id = id; }
public void setNumber(String number) { this.number = number; } public Long getId() { return id; } public String getNumber() { return number; } }

String[] getStockSymbols();
double getAskingPrice(String stockSymbol);

double getOfferPrice(String stockSymbol);
void putBuyOrder(String stockSymbol, int shares, double bidPrice);
void putSellOrder(String stockSymbol, int shares, double offerPrice);
}

public interface IStockAnalysisService {
double getEstimatedValue(String stockSymbol);
}

public interface IAutomatedStockTrader { void executeTrades(); }

analysisService = new

StockAnalysisServiceImpl();

private IOnlineBrokerageService brokerageService = new NewYorkStockExchangeBrokerageServiceImpl();

public void executeTrades() { … }
}

public class MyApplication {
public static void main(String[] args) {
IAutomatedStockTrader stockTrader = new VerySimpleStockTraderImpl(); stockTrader.executeTrades();
}
}

Декларативность: dependency injection

StockAnalysisServiceImpl

NewYorkStockExchangeBrokerageServiceImpl

Декларативность: dependency injection

analysisService;
private IOnlineBrokerageService brokerageService;

public VerySimpleStockTraderImpl(
IStockAnalysisService analysisService, IOnlineBrokerageService

brokerageService) {
this.analysisService = analysisService;
this.brokerageService = brokerageService;
}
public void executeTrades() { … }
}
public class MyApplication {
public static void main(String[] args) {
IAutomatedStockTrader stockTrader =
(IAutomatedStockTrader) DependencyManager.create(IAutomatedStockTrader.class);
stockTrader.executeTrades();
}
}

Декларативность: dependency injection

и контейнеры (containers)

you configure a web component or enterprise bean so

that system resources are accessed only by authorized users.

■ The Java EE transaction model lets you specify relationships among methods that make up a single transaction so that all methods in one transaction are treated as a single unit.

■ JNDI lookup services provide a unified interface to multiple naming and directory services in the enterprise so that application components can access these services.

■ The Java EE remote connectivity model manages low-level communications between clients and enterprise beans. After an enterprise bean is created, a client invokes methods on it as if it were in the same virtual machine.

GlassFish server Open Source Edition
Oracle GlassFish Server
Oracle WebLogic Server
JBoss

Application Server
Joss Enterprise Application Platform
OW2 JOnAS
IBM WebSphere Application Server
IBM WebSphere Application Server Community Edition
Apache Geronimo
Fujitsu Interstage Application Server[16]
TmaxSoft JEUS

class files for enterprise beans and, optionally, an EJB

deployment descriptor. EJB modules are packaged as JAR files with a .jar extension.

■ Web modules, which contain servlet class files, web files, supporting class files, image and
HTML files, and, optionally, a web application deployment descriptor. Web modules are
packaged as JAR files with a .war (web archive) extension.

■ Application client modules, which contain class files and, optionally, an application client
deployment descriptor. Application client modules are packaged as JAR files with a .jar
extension.

■ Resource adapter modules, which contain all Java interfaces, classes, native libraries, and,
optionally, a resource adapter deployment descriptor. Together, these implement the
Connector architecture for a particular EIS. Resource adapter modules are packaged as JAR files with an .rar (resource adapter archive) extension.

Pages
contexts and Dependency Injection
Enterprise JavaBean
Java Persistence
Java Transaction (X/Open

XA)
Java Message Service
Java Connector Architecture (лучше ESB)

of a web or application server. Web applications are

of the following types:
■ Presentation-oriented: A presentation-oriented web application generates interactive web pages containing various types of markup language (HTML, XHTML, XML, and so on) and dynamic content in response to requests.
■ Service-oriented: A service-oriented web application implements the endpoint of a web service. Presentation-oriented applications are often clients of service-oriented web applications.

implemented with JavaServer Faces technology, JSP pages, web service

(WS) endpoints.

Web Services: SOAP – based WS, RESTful WS

логике.
Разработка клиентской части (Web) отделена от разработки бизнес –

логики и работой с БД. Это особенно важно для малых устройств (смартфоны, планшеты).
Повторное использование кода.

(асинхронный вызов)
Entity Bean (Persistence классы)
Enterprise Bean
Statefull:
■ The bean’s

state represents the interaction between the bean and a specific client.
■ The bean needs to hold information about the client across method invocations.
■ The bean mediates between the client and the other components of the application,
presenting a simplified view to the client.
Stateless:
■ The bean’s state has no data for a specific client.
■ In a single method invocation, the bean performs a generic task for all clients. For example,you might use a stateless session bean to send an email that confirms an online order.
■ The bean implements a web service.
Singletone:
■ State needs to be shared across the application.
■ A single enterprise bean needs to be accessed by multiple threads concurrently.
■ The application needs an enterprise bean to perform tasks upon application startup and
shutdown.
■ The bean implements a web service.
Message-driven (like stateless):
■ To avoid tying up server resources, do not to use blocking synchronous; receives in a server-side component