Transcript public - Meetup

Testing your DAO’s
with Java
Rory Preddy
Agenda
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What we encounter
Testing with JDBC
CDI 101
Testing with CDI
–DeltaSpike
• Summary
What we encounter
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Entities or SQL
DAO layer
Service Layer (CDI, ManagedBean or EJB)
Web layer
• Arquillian for testing Service with EJB’s
• Selenium on Web Layer
• No DAO testing
Why Test DAO?
• Persistence frameworks (JPA, JDO, etc) help
but…
• Frameworks can be misconfigured
• Frameworks can be asked to do the wrong
thing
• Incorrect mappings
• Cascade actions can be hell
• Physical DB’s are rarely in a sober state
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What we encounter
Testing with JDBC
CDI 101
Testing with CDI
– DeltaSpike
• Summary
Basic testing principles
• Create multiple databases
– In memory for local
– Physical for DEV/UAT
• Ensure the state of the database prior to
testing
• Test in small chunks of data
– Don’t try to load everything into the database for
a single test
Test with JDBC (demo)
• Maven build
• Create DB with Derby Tools
• Insert Base data with DBUnit
• Create a Connection
• Test CRUD
• Clean database
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What we encounter
Testing with JDBC
CDI 101
Testing with CDI
– DeltaSpike
• Summary
Content & Dependency Injection
• Inversion Of Control" object creation
• No more hardcoded dependencies
• Customer cs = new VerySpecialCustomer();
• Basically the old Factory Pattern
Hollywood Principle: “Don't call us, we call you!”
Macho Principle “Dude, gimme that bloody stuff!”
Content & Dependency Injection
• Can we used in Standard Edition, Servlet or
EJB containers
• Adds the Web conversation context
• + to standard contexts (request, session, application…)
To activate CDI
• Create a beans.xml file (can be empty)
• Add maven dependencies
CDI history & actual state
• Main milestone :
• December 2009 : CDI 1.0
• June 2013 : CDI 1.1
• April 2014 : CDI 1.2
• Q1 2016 : CDI 2.0 due
• Implementations :
• JBoss Weld (RI) : WildFly, JBoss EAP, Glassfish, Weblogic
• Apache OpenWebBeans : TomEE, Websphere
• Check http://cdi-spec.org
Dependency Injection
@Inject
Dependency Injection
public class HelloService {
public String hello() {
return "Hello World!";
}
}
Dependency Injection in Constructor
public class MyBean {
private HelloService service;
@Inject
public MyBean(HelloService service) {
this.service = service;
}
public void displayHello() {
display( service.hello();
}
}
Dependency Injection in setter
public class MyBean {
private HelloService service;
@Inject
public void setService(HelloService service) {
this.service = service;
}
public void displayHello() {
display( service.hello();
}
}
Dependency Injection in field
public class MyBean {
@Inject HelloService service;
public void displayHello() {
display( service.hello();
}
}
Qualifiers
public interface HelloService {
public String hello();
}
public class AfrikaansHelloService implements HelloService
{
public String hello() {
return "Howzit!";
}
}
public class EnglishHelloService implements HelloService {
public String hello() {
return "Hello World!";
}
}
Qualifiers
@Qualifier
@Retention(RUNTIME)
@Target({FIELD, TYPE, METHOD, PARAMETER})
public @interface Afrikaans {}
@Qualifier
@Retention(RUNTIME)
@Target({FIELD, TYPE, METHOD, PARAMETER})
public @interface English {}
Qualifiers (declaring)
@Afrikaans
public class AfrikaansHelloService implements HelloService {
public String hello() {
return "Howzit!";}
}
@English
public class EnglistHelloService implements HelloService {
public String hello() {
return “Hello world!";}
}
Qualifiers (assigning)
public class MyBean {
@Inject @Afrikaans HelloService service;
public void displayHello() {
display( service.hello();
}
}
public class MyBean {
@Inject @English HelloService service;
public void displayHello() {
display( service.hello();
}
}
Qualifiers with members
@Qualifier
@Retention(RUNTIME)
@Target({FIELD, TYPE, METHOD, PARAMETER})
public @interface Language {
Languages value();
@Nonbinding String description() default "";
public enum Languages {
Afrikaans, ENGLISH
}
}
Qualifiers (declaring)
@Language(Afrikaans)
public class AfrikaansHelloService implements HelloService {
public String hello() {
return "Howzit!";
}
}
@Language(ENGLISH)
public class EnglishHelloService implements HelloService {
public String hello() {
return "Hello World!";
}!
}
Qualifiers (assigning)
public class MyBean {
@Inject @Language(ENGLISH) HelloService service;
public void displayHello() {
display( service.hello();
}
}
public class MyBean {
@Inject @Language(Afrikaans) HelloService service;
public void displayHello() {
display( service.hello();
}
}
Reserved Qualifiers (filter)
• @Any – all beans, unless they have @New
• @Default, @Named (Filter)
• @New – forces the container to return
a new bean instance each time
@New public class SomeBean {..}
public class AnotherBean {
@Inject SomeBean bean1;
@Inject SomeBean bean2;
@PostConstruct void init() {
log.info(bean1 == bean2); // false
}
}
Producers
@Produces
public MyNonCDIClass myProducer() {
return new MyNonCdiClass();
}
...
@Inject
MyNonCDIClass bean;
Injecting EntityManager
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@Produces
@Produces @PersistenceContext(unitName="CustomerDatabase")
@CustomerDatabase EntityManager customerDatabasePersistenceContext;
• @inject
@Inject @CustomerDatabase EntityManager myEntityManager
• Close
public void close(@Disposes EntityManager em) {
if (em.isOpen()) {
em.close();
}
}
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What we encounter
Testing with JDBC
CDI 101
Testing with CDI
– DeltaSpike
• Summary
CDI Frameworks
FRAMEWORK
Spring
Guice
Weld
OpenWebBeans
Who owns it
EMC (VMWARE)
Google
Redhat
Apache
Extension
DeltaSpike
Who owns it
Apache
DeltaSpike?
What is in DeltaSpike?
Module
Core
Bean Validation
Role
missing CDI @Stereotypes
Container Control CDI container booting and shutdown and associated context lifecycle
management
Data
Declarative queries, reducing boilerplate
@Transactional context and scope
JPA
JSF
Type-safe view config, multi-window handling, new scopes (WindowScoped,
ViewScope, ViewAccessScoped, GroupedConversationScoped) and
integration with DeltaSpike “core” messages and exception handling
Scheduler
Security
Servlet
Test-Control
CdiTestRunner
EntityManager without DeltaSpike
(demo)
EntityManager's life cycle depends on its type, which can be:
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Full blown Application server
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Container-managed transactional
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Container-managed extended
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Servlet and Standard Edition
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Application-managed
With Application managed:
• Create Custom Weld Junit runner
• Boot a Transaction manager (Seam)
• or create a custom EntityManager scope:
• entityManager.getTransaction().begin()
• entityManager.getTransaction().commit();
• entityManager.getTransaction().rollback();
• Dispose of Entity manager
EntityManager with DeltaSpike
(demo)
• Annotation DAO with @Transaction
• Paved the way for @Transactional in Java EE 7
• Inject DeltaSpike Runner
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What we encounter
Testing with JDBC
CDI 101
Testing with CDI
– DeltaSpike
• Summary
Summary
• JDBC testing
– Use DBUnit and Derby tools
• JPA testing
– Inject entity manager
– Use DeltaSpike test Controls
Next month - DeltaSpike
Data vs Spring Data
Questions?