Spring frame work
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Transcript of Spring frame work
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“Lightweight Container”◦ Very loosely coupled◦ Components widely reusable and separately
packaged Created by Rod Johnson
◦ Based on “Expert one-on-one J2EE Design and Development”
◦ Currently on version 1.1.1
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Wiring of components (Dependency Injection)◦ Promotes/simplifies decoupling, design to interfaces,
TDD Declarative programming without J2EE
◦ Easily configured aspects, esp. transaction support Simplify use of popular technologies
◦ Abstractions insulate application from specifics, eliminate redundant code, and handle common error conditions
◦ Underlying technology specifics still accessible (closures)
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Conversion of checked exceptions to unchecked◦ (Or is this a reason not to use it?)
Not an all-or-nothing solution◦ Extremely modular and flexible
Well designed◦ Easy to extend◦ Many reusable classes
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Inversion of Control (IoC) “Hollywood Principle”
◦ Don't call me, I'll call you “Container” resolves (injects) dependencies
of components by setting implementation object (push)
As opposed to component instantiating or Service Locator pattern where component locates implementation (pull)
Martin Fowler calls Dependency Injection
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Variations on dependency injection◦ Interface based (Avalon)◦ Constructor-based (PicoContainer, Spring)◦ Setter-based (Spring)
BeanFactory provides configuration framework to initialize and “wire” JavaBeans◦ org.springframework.beans and
org.springframework.context Typically use the XmlBeanFactory, employing
XML configuration files
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BeanFactory configured components need have no Spring dependencies◦ Simple JavaBeans
Beans are singletons by default Properties may be simple values or
references to other beans Built-in support for defining Lists, Maps,
Sets, and Properties collection types. ◦Custom PropertyEditors may be defined to convert string values to other, arbitrary types.
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Property and constructor based IoC<bean id="exampleBean" class="examples.ExampleBean"> <property name="beanOne"><ref bean="anotherExampleBean"/></property> <property name="beanTwo"><ref bean="yetAnotherBean"/></property> <property name="integerProperty">1</property></bean>
<bean id="anotherExampleBean" class="examples.AnotherBean"/><bean id="yetAnotherBean" class="examples.YetAnotherBean"/>
<bean id="exampleBean" class="examples.ExampleBean"> <constructor-arg><ref bean="anotherExampleBean"/></constructor-arg> <constructor-arg><ref bean="yetAnotherBean"/></constructor-arg> <constructor-arg><value>1</value></constructor-arg></bean>
<bean id="anotherExampleBean" class="examples.AnotherBean"/><bean id="yetAnotherBean" class="examples.YetAnotherBean"/>
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Direct instantiation◦ <bean id=“beanId” class=“className”>
BeanFactory instantiation◦ Same syntax but class is subclass of BeanFactory◦ getObject() called to obtain Bean
Static Factory◦ <bean id=“beanId” class=“className" factory-method="
staticCreationMethod“> Instance Factory Method
◦ <bean id=“beanId” factory-bean=“existingBeanId" factory-method=“nonStaticCreationMethod">
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Beans may be singletons or “prototypes”◦ Attribute singleton=“false” causes instantiation
with each getBean() lookup◦ Singleton is default
XmlBeanFactory pre-instantiates singletons◦ May be overridden on per-instance basis by lazy-
init=“true” Beans may also be marked abstract,
allowing reuse of attribute values through inheritance
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Beans may be auto-wired (rather than using <ref>)◦ Per-bean attribute autowire◦ Explicit settings override
autowire=“name”◦ Bean identifier matches property name
autowire=“type”◦ Type matches other defined bean
autowire=”constructor”◦ Match constructor argument types
autowire=”autodetect”◦ Attempt by constructor, otherwise “type”
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Ensures properties are defined◦ Per-bean attribute dependency-check◦ None required by default◦ Verifies autowiring succeeded
“simple”◦ all but collaborators
“object”◦ collaborators only
“all”◦ Collaborators, primitive types, and collections
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Can define init method called after properties set◦ init-method=”<method-name>”
Can define destroy method as shutdown hook◦ destroy-method=”<method-name>”
May alternatively implement InitializingBean and/or DisposableBean◦ At cost of Spring dependency
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BeanFactoryAware interface provides BeanFactory for bean◦ setBeanFactory(BeanFactory)
BeanNameAware interface provides bean name◦ setBeanName(String)
FactoryBean for beans which are themselves factories◦ Object getObject()◦ Boolean isSingleton()◦ Class getObjectType()
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InputStream is = new FileInputStream("beans.xml"); XmlBeanFactory factory = new XmlBeanFactory(is);MyBeanClass bean = (MyBeanClass)factory.getBean(“myBean”);
ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml"); MyBeanClass bean = (MyBeanClass)ctx.getBean(“myBean”);
OR
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Extends functionality of BeanFactory Pre-instantiates singleton beans Detects and registers BeanPostProcessors
and BeanFactoryPostProcessors Supports nesting of contexts ApplicationListener and ApplicationEvents
◦ Initialized and closed predefined◦ Custom may be created
MessageSource provides i18n messaging◦ <bean id=”messageSource”
class=”...ResourceBundleMessageSource”/>◦ Contains list of bundle base names
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Web applications may use ContextLoaderListener to initialize Spring
<context-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/daoContext.xml /WEB-INF/applicationContext.xml </param-value> </context-param>
<listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener>
web.xml
Automatically done by Spring DispatcherServlet
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MethodInvokingFactoryBean◦ Invokes method on registered beans or any
static methods◦ Stores return value
SingletonBeanFactoryLocator and ContextSingletonBeanFactoryLocator◦ Useful for sharing BeanFactories◦ Eliminate duplication of beans in multiple similar
factories or contexts
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Defined beans inheriting from BeanFactoryPostProcessor are detected and invoked
CustomEditorConfigurer◦ Registers custom PropertyEditors for converting
configuration string values to specific types AutoProxyCreators
◦ Wrap beans in proxies based on various criteria (name, metadata, etc)
PropertyResourceConfigurer Sets from property file and/or system properties
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<bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> <property name="location"><value>database.properties</value></property> </bean>
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <property name="driverClassName"> <value>${database.connection.driver_class}</value> </property> <property name="url"> <value>${database.connection.url}</value> </property></bean>
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Aspect-oriented programming (AOP) provides for simplified application of cross-cutting concerns◦ Transaction management◦ Security◦ Logging◦ Auditing◦ Locking
AOP sometimes (partially) achieved via Decorators or Proxies◦ CORBA Portable Interceptors◦ Servlet Filters
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Aspect - Implementation of a cross-cutting concern. ◦ Spring Advisors or Interceptors
Joinpoint - Execution point to target◦ Typically, methods
Advice - Action taken at a particular joinpoint. Pointcut - A set of joinpoints specifying where
advice should be applied (e.g. Regular expression) Introduction/Mixin - Adding methods or fields to an
advised class. Weaving - Assembling aspects into advised objects.
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Generally, applies aspects to beans using BeanFactory◦ Uses Dynamic Proxies if interface available
otherwise CGLIB◦ CGLIB creates derived class which proxies
requests Bean class may not be final
Less capable than AspectJ◦ does not have field interception◦ only runtime weaving solution is available◦ Closer integration with AspectJ anticipated
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Pointcut applicability to a class may be evaluated statically or dynamically
Spring only creates proxies where necessary
public interface Pointcut { ClassFilter getClassFilter(); MethodMatcher getMethodMatcher();}public interface ClassFilter { boolean matches(Class clazz);}
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Pointcut may be statically or dynamically evaluated based on isRuntime()
Abstract class StaticMethodMatcherPointcut requires override of 1st method only
public interface MethodMatcher { boolean matches(Method m, Class targetClass); boolean isRuntime(); boolean matches(Method m, Class targetClass, Object[] args);}
Only called if isRuntime() == true
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Spring predefined pointcuts◦ In org.springframework.aop.support package
RegexpMethodPointcut◦ Union of multiple regular expressions◦ Uses Jakarta ORO package
ControlFlowPointcut◦ Similar to AspectJ cflow◦ Applied if call stack includes specific class and,
optionally, method UnionPointcut
◦ Merges pointcuts
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Can have per-class or per-instance Advice Spring provides several Advice types Around Advice
AOP Alliance compliant Must call invocation.proceed() to call target
public class MyAdvice implements AroundAdvice { Object invoke(MethodInvocation invocation) { // change arguments, start transaction, lock, etc. invocation.proceed(); // change return value, stop transaction, unlock,etc. }}
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MethodBeforeAdvice◦ void before(Method m, Object[] args, Object target)◦ Cannot alter return type
ThrowsAdvice◦ Marker interface◦ Implementors define methods of form:
afterThrowing([Method], [args], [target], subclassOfThrowable)
AfterReturningAdvice◦ void afterReturning(Object returnValue, Method, m,
Object[] args, Object target)◦ Cannot modify return value
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IntroductionInterceptor provides ability to define mixins
public class RollbackAdvice extends DelegatingIntroductionInterceptor implements RollbackSupport { Map map = new HashMap(); void rollback(Date date) { // rollback to state at given time }
public Object invoke(MethodInvocation invocation) { // record change and time of change }}
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<bean id=“meetingTarget" class=“ex.DefaultMeeting“ singleton=“false”> <property name=“topic">Spring</property></bean>
<bean id="myAdvisor" class=“ex.RollbackAdvice" singleton=”false”></bean>
<bean id="debugInterceptor" class="org.springframework.aop.interceptor.DebugInterceptor"></bean>
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<bean id=“meeting" class="org.springframework.aop.framework.ProxyFactoryBean"> <property name="proxyInterfaces"> <value>ex.Meeting</value> </property>
<property name="target"><ref local=“meetingTarget"/></property>
<property name="interceptorNames"> <list> <value>myAdvisor</value> <value>debugInterceptor</value> </list> </property></bean>
Advisors applied in order
All methodsusing CGLib if none defined
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Autoproxy bean definitions automatically proxy selected beans.
BeanNameAutoProxyCreator◦Adds listed advisors/interceptors to beans with names matching regular expression
DefaultAdvisorAutoProxyCreator◦Generic autoproxy infrastructure support◦Applies all advisors defined in the context to all beans, proxying appropriately
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Spring supports obtaining meta data Object attributes at class, method, and field level◦ Not yet argument level (as JSR-175)
Currently supports Jakarta Commons Attributes
Support for JSR-175 in work Metadata support provided via Attributes
interface◦ Amenable to mocking unlike JDK reflection and
Commons static methods
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Configuration of autoproxying based on metadata attributes simplifies configuration◦ Define custom attribute class◦ Define Advisor with pointcut based on custom
attribute◦ Add Advisor in ApplicationContext with autoproxy
Examples◦ Transaction Attributes◦ Security Attributes◦ Pooling◦ Mapping of controllers to URLs
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Spring provides AOP support for declarative transactions
Delegates to a PlatformTransactionManager instance◦ DataSourceTransactionManager◦ HibernateTransactionManager◦ JdoTransactionManager◦ JtaTransactionManager
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<bean id="sessionFactory" class="org.springframework.orm.hibernate.LocalSessionFactoryBean"> <property name="dataSource"><ref bean="dataSource"/></property> <property name="mappingResources"> <list> <value>com/../model/*.hbm.xml</value> </list> </property></bean>
<bean id="transactionManager” class="org.springframework.orm.hibernate.HibernateTransactionManager"> <property name="sessionFactory"> <ref bean="sessionFactory"/> </property></bean>
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Declarative transactional support can be added to any bean by using TransactionProxyFactoryBean
Similar to EJB, transaction attributes may be defined on a per-method basis
Also allows definition of pre- and post- interceptors (e.g. for security)
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<bean id=“reservationService" class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean"> <property name="transactionManager"> <ref bean="transactionManager"/> </property> <property name="target"><ref local=“reservationServiceTarget"/></property> <property name="transactionAttributes"> <props> <prop key=“reserveRoom*">PROPAGATION_REQUIRED</prop> <prop key="*">PROPAGATION_REQUIRED,readOnly</prop> </props> </property> </bean>
Declarative transaction support for single bean
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<bean id="autoproxy" class="org...DefaultAdvisorAutoProxyCreator"></bean>
<bean id="transactionAdvisor" class="org...TransactionAttributeSourceAdvisor" autowire="constructor" ></bean>
<bean id="transactionInterceptor" class="org...TransactionInterceptor" autowire="byType"> </bean>
<bean id="transactionAttributeSource" class="org...AttributesTransactionAttributeSource" autowire="constructor"></bean>
<bean id="attributes" class="org...CommonsAttributes"/>
Caches metadatafrom classes
Generic autoproxysupport
Applies transactionusing transactionManager
Invokes interceptorbased on attributes
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DAO support provides pluggable framework for persistence
Currently supports JDBC, Hibernate, JDO, and iBatis
Defines consistent exception hierarchy (based on RuntimeException)
Provides abstract “Support” classes for each technology◦ Template methods define specific queries
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public class ReservationDaoImpl extends HibernateDaoSupport implements ReservationDao {
public Reservation getReservation (Long orderId) { return (Reservation)getHibernateTemplate().load(Reservation .class, orderId); }
public void saveReservation (Reservation r) { getHibernateTemplate().saveOrUpdate(r); }
public void remove(Reservation Reservation) { getHibernateTemplate().delete(r); }
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public Reservation[] findReservations(Room room) { List list = getHibernateTemplate().find( "from Reservation reservation “ + “ where reservation.resource =? “ + “ order by reservation.start", instrument); return (Reservation[]) list.toArray(new Reservation[list.size()]);
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public Reservation[] findReservations(final DateRange range) { final HibernateTemplate template = getHibernateTemplate(); List list = (List) template.execute(new HibernateCallback() { public Object doInHibernate(Session session) { Query query = session.createQuery( "from Reservation r “ + “ where r.start > :rangeStart and r.start < :rangeEnd “); query.setDate("rangeStart", range.getStartDate() query.setDate("rangeEnd", range.getEndDate()) return query.list(); } }); return (Reservation[]) list.toArray(new Reservation[list.size()]); }}
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<bean id="sessionFactory" class="org.springframework.orm.hibernate.LocalSessionFactoryBean"> <property name="dataSource"><ref bean="dataSource"/></property> <property name="mappingResources"> <list> <value>com/jensenp/Reservation/Room.hbm.xml</value> <value>com/jensenp/Reservation/Reservation.hbm.xml</value> <value>com/jensenp/Reservation/Resource.hbm.xml</value> </list> </property> <property name="hibernateProperties"> <props> <prop key="hibernate.dialect">${hibernate.dialect}</prop> <prop key="hibernate.hbm2ddl.auto">${hibernate.hbm2ddl.auto} </prop> <prop key="hibernate.show_sql">${hibernate.show_sql}</prop> </props> </property> </bean>
<bean id=“reservationDao" class="com.jensenp.Reservation.ReservationDaoImpl"> <property name="sessionFactory"><ref bean="sessionFactory"/> </property> </bean>
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JDBCTemplate provides◦ Translation of SQLExceptions to more meaningful
Spring Runtime exceptions◦ Integrates thread-specific transactions
MappingSQLQuery simplifies mapping of ResultSets to Java objects
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The DispatcherServlet is the Spring Front Controller
Initializes WebApplicationContext Uses /WEB-INF/[servlet-name]-servlet.xml
by default WebApplicationContext is bound into
ServletContext
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HandlerMapping◦ Routing of requests to handlers
HandlerAdapter◦ Adapts to handler interface. Default utilizes
Controllers HandlerExceptionResolver
◦ Maps exceptions to error pages◦ Similar to standard Servlet, but more flexible
ViewResolver◦ Maps symbolic name to view
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MultipartResolver◦ Handling of file upload
LocaleResolver◦ Default uses HTTP accept header, cookie, or
session
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Controller interface defines one method◦ ModelAndView
handleRequest(HttpServletRequest req, HttpServletResponse resp) throws Exception
ModelAndView consists of a view identifier and a Map of model data
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CommandControllers bind parameters to data objects
AbstractCommandController AbstractFormController SimpleFormController WizardFormController